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Introducing the Keysight U1253B True RMS OLED Multimeter

1. Pr ess Shift or after time up to start charging ERROR Over limit level p gt Charge error Figure 5 7 Battery charging procedures U1253B User s and Service Guide Maintenance 5 Fuse checking procedure It is recommended that you check the fuses of the multimeter before using it Follow the instructions below to test the fuses inside the multimeter Refer to Figure 5 9 for the respective positions of Fuse 1 and Fuse 2 1 Set the rotary switch to S2 Q 4H 2 Connect the red test lead to the input terminal 1 T VemV x Agilent A CAT I b CAT IN 1p Y 10 4 MAX Figure 5 8 Fuse checking procedures U1253B User s and Service Guide 135 5 Maintenance 3 To test Fuse 1 place the tip of the test probe on the right pA mA half of input terminal ACHG Ensure that the probe tip touches the metal inside the input terminal as shown in Figure 5 8 4 To test Fuse 2 place and touch the tip of the test probe on the right half of input terminal A Ensure that the probe tip touches the metal inside the input terminal 5 Observe the reading on the instrument s display Refer to Table 5 3 for the possible readings that could appear 6 Replace the fuse when OL is displayed Table 5 3 U1253B measurement readings for fuse checking Fuse OK approximately Replace fuse Current input terminal Fuse Fuse rating Display
2. 9 V Alkaline non chargeable battery ANSI NEDA 1604A or IEC 6LR61 9 V Carbon zinc non chargeable battery ANSI NEDA 1604D or IEC6F22 9 V size 300 mAH Ni MH rechargeable battery 7 2 V nominal voltage e 9 V size 250 mAH Ni MH rechargeable battery 8 4 V nominal voltage Storage considerations CAUTION To avoid instrument damage from battery leakage e Always remove dead batteries immediately e Itis recommended that the battery is removed and stored separately if the multimeter is to be unused for long periods of time After the first charge it is recommended that you fully charge the battery periodically even when it is not in use This is because the Ni MH rechargeable battery pack may drain with time The performance of the rechargeable battery may degrade with time U1253B User s and Service Guide 127 5 Maintenance Charging the battery WARNING Do not discharge the battery by shorting it or subjecting it to reverse polarity Make sure a battery is rechargeable before charging it Do not rotate the rotary switch when the battery is being charged CAUTION AR mA A Z nan OUT ms OFF e Do not rotate the rotary switch from cne position when charging the battery e Perform battery charging only with a 9 V Ni MH rechargeable battery 7 2 V nominal voltage or 9 V size Ni MH rechargeable battery 8 4 V nominal voltage e Disconnect test leads from all the terminals when charging the batter
3. e For example if the reference input of the next calibration item is shorting the input terminals the secondary display will indicate REF SH ORT If you do not intend to perform the complete set of calibration items you may press or W to select the item you wish to calibrate 4 Set up the indicated reference input and apply this input to the correct terminals of the U1253B handheld multimeter For example e If the required reference input is SHORT use a shorting plug to short the two relevant terminals e If the required reference input is OPEN just leave the terminals open e If the required reference input is a voltage current resistance capacitance or temperature value set up the Fluke 5520A calibrator or another device with equivalent standard of accuracy to provide the necessary input 5 With the required reference input applied to the correct terminals press Cz to start the present calibration item During calibration the primary display and bar graph will indicate the uncalibrated reading and the calibration 171 172 Performance Tests and Calibration 10 indicator CAL will appear on the upper left corner of the secondary display If the reading is within the acceptable range the word PASS will be shown momentarily and then the instrument will proceed to the next calibration item If the reading is out of the acceptable range it will remain at the pre
4. Press and hold or for more than 1 second to quit the data hold function U1253B User s and Service Guide Functions and Features 3 Figure 3 2 Data hold mode operation U1253B User s and Service Guide 65 3 Functions and Features Refresh Hold 66 The Refresh Hold function allows you to freeze the displayed value The bar graph is not held and will continue to reflect the instantaneous measured value You can use the Setup mode to enable Refresh Hold mode when you are working with fluctuating values This function will auto trigger or update the held value with a new measured value and emit a tone as a reminder 1 Press to enter Refresh Hold mode The present value will be held and the f i i symbol will appear It will be ready to hold a new measured value once the variation of measured values exceeds the variation count setting While the multimeter is waiting for a new stable value the character R in the fs iiir annunciator will flash The fff TB annunciator will stop flashing once the new updated to the display The fi fiiii iii annunciator will remain on and the multimeter will emit a tone to remind you of this Press again to disable this function You may also press for more than 1 second to quit the Refresh Hold function U1253B User s and Service Guide Functions and Features 3 sa Press Shif
5. Vil Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC This instrument complies with the WEEE Directive 2002 96 EC marking requirement This affixed product label indicates that you must not discard this electrical electronic product in domestic household waste Product Category With reference to the equipment types in the WEEE directive Annex 1 this instrument is classified as a Monitoring and Control Instrument product The affixed product label is as shown below Do not dispose in domestic household waste To return this unwanted instrument contact your nearest Keysight Technologies or visit www keysight com environment product for more information Keysight Technologies through Rechargeable Battery Recycling Corporation RBRC offers free and convenient battery recycling options in the U S and Canada Contact RBRC at 877 2 RECYCLE 877 273 2925 or online at http www call2recycle org for the nearest recycling location Vill U1253B User s and Service Guide In This Guide 1 Getting Started This chapter contains information on the U1253B true RMS OLED multimeter front panel rotary switch keypad display terminals and rear panel 2 Making Measurements This chapter contains information on how to make measurements using the U1253B true RMS OLED multimeter 3 Functions and Features This chapter contains information on the functions and features available for the U1
6. giis dEm R gt o0509 M P dBm gt 0050A HE o Mep i aaa d Pep 1 Press lt or gt to go to the digit EDIT Set all digits to ZERO RHOLD O00 tosetRHOLDto OFF Pak S HAND LOG TIME 00015 enable Data Hold cit gt hte dem OO SOG ae qo Peru i Press A or W to edit the value you want to edit ENT EDIT RHOLD OFF RHOLD FE D LOG HAND D LOG HAND LOG TIME bO015 LOG TIME 00015 e SE Cs gt o GEE i tT gt POS Oa dem OS a HE d o Heny HEH Hern d Press Hz to save and exit or press ESC to exit without saving Figure 4 2 Data Hold Refresh Hold setup U1253B User s and Service Guide 93 4 Changing the Default Settings Setting data logging mode 1 Set to HAND to enable manual hand data logging or set to TIME to enable interval time data logging Refer to Figure 4 3 below Press Hz apo Fis to edit iii sizz S P mses E sisss em e o 3 f bha J me 1m Press A or Y to switch between HAND data logging and TIME interval logging Press Hz to save and exit or press ESC to exit without saving Figure 4 3 Data logging setup 2 For interval time data logging set the LOG TIME within the range of 0001 second to 9999 seconds to specify the data logging interval 94 U1253B User s and Service Guide Changing the Default Settings 4 Press A or Y to edit the value Press
7. Functions and Features 3 Reviewing logged data U1253B User s and Service Guide 1 Press for more than 1 second to enter Log Review mode The last logged entry ifiis and the last logging index are displayed Press to switch between manual hand and interval time logging review mode Press A to ascend or W to descend through the logged data Press to select first record and to select the last record for quick navigation Press C for more than 1 second at the respective Log Review mode to clear logged data Press for more than 1 second to stop logging and exit this mode 79 3 Functions and Features Press View Press W Press A Press W Press v Press gt Press J gt Press Log for gt 1 sec Press Log for gt 1 sec to clear all manual logs to clear all interval logs Figure 3 11 Log review mode operation 80 U1253B User s and Service Guide Functions and Features 3 Square Wave Output The U1253B true RMS OLED multimeter s square wave output can be used to generate a PWM pulse width modulation output or provide a synchronous clock source baud rate generator You can also use this function to check and calibrate flow meter displays counters tachometers oscilloscopes frequency converters frequency transmitters and other frequency input devices Selecting square wave output freq
8. Setting the power on melody 107 Setting the power on greeting screen 107 Setting baud rate 108 Setting data bits 109 Setting parity check 110 Setting echo mode 111 Setting printmode 112 Revision 113 Serialnumber 113 Voltage alert 114 M initial 115 Smooth refresh rate 119 Returning to default factory settings 120 Setting the battery type 121 Setting the Filter 122 5h Maintenance U1253B User s and Service Guide Introduction 124 General maintenance 124 Battery replacement 125 Storage considerations 127 Charging the battery 128 Fuse checking procedure 135 Fuse replacement 137 XIII XIV Troubleshooting 139 Replaceable Parts 141 To order replaceable parts 141 Performance Tests and Calibration Calibration Overview 144 Closed case electronic calibration 144 Keysight Technologies calibration services 144 Calibration interval 145 Other recommendations for calibration 145 Recommended Test Equipment 146 Basic Operating Tests 147 Testing the display 14 7 Current terminals test 148 Charge terminals alert test 149 Test Considerations 150 Performance Verification Tests 151 Calibration Security 158 Unsecuring the instrument for calibration 158 Changing Calibration Security Code 161 Resetting the security code to factory default 163 Adjustment Considerations 165 Valid adjustment reference input values 166 Calibration From Front Panel 1 0 Calibration process 1 0 Calibration procedures 1 1 Calibration
9. pinim BEST Hi and the present measurement value is displayed The multimeter emits a sound when a new maximum or Aue value is recorded present edine a ihe 3 Press hoa or a for more than 1 second to exit Dynamic 2 r CD mode e Press to restart dynamic recording e The average value is the true average of all measured values taken in the Dynamic recording mode If an overload is recorded the averaging function wll S and the average value becomes OL overload Auto Power Off i is disabled in Dynamic Recording mode U1253B User s and Service Guide Functions and Features Press Max Min for gt 1 sec Press Max Min for gt 1 sec Or Press for gt 1 sec Press Max Min for gt 1 sec Or Press for gt 1 sec Press Max Min for gt 1 sec Or Press for gt 1 sec Figure 3 1 Dynamic recording mode operation U1253B User s and Service Guide 3 63 3 Functions and Features Data Hold Trigger Hold 64 The Data Hold function allows you to freeze the displayed value 1 Press to freeze the displayed value and to enter manual trigger mode ifi is displayed Press again to freeze the next value being measured The character T in the T ff THY annunciator flashes before the new value is updated on the display While in the Data Hold mode you may press CP to switch between DC AC and AC DC measurements
10. 1 8 of Selecting display with the Dual button on page 22 for a list of dual measurements available e Press and hold for more than 1 second to exit dual display mode CAUTION e For measuring DC current from a mixed signal in the DC measurement mode ensure that the Filter is enabled refer to Setting the Filter on page 122 e For measuring AC current signals with a DC offset refer to Measuring AC and DC Signals on page 34 U1253B User s and Service Guide 35 2 Making Measurements 4 REOPRE nii GLITCH A CAT IV 600 V CAT IlI 1000 V Black Lead Red Lead Figure 2 3 Measuring uA and mA current 36 U1253B User s and Service Guide Making Measurements 2 Percentage scale of 4 mA to 20 mA Set up the multimeter to measure percentage scale as shown in Figure 2 4 Probe the test points and read the display e Press CD to select percentage scale display Ensure that or is shown on the display e The percentage scale for 4 mA to 20 mA or 0 mA to 20 mA is calculated using its corresponding DC mA measurement The U1253B will automatically optimize the best resolution according to Table 2 2 below e Press to change the measurement range The percentage scale for 4 mA to 20 mA or 0 mA to 20 mA is set to two ranges as follows Table 2 2 Percentage scale and measurement range Percentage scale 4 mA to 20 or 0 mA to 20 mA DC mA auto or manual Always auto range range 999 99 en 99
11. 40 Exceeding the crest factor limit may result in an incorrect or a lower reading Do not exceed the crest factor limit to avoid instrument damage and the risk of electric shock 15 kHz to 100 kHz 3 5 120 3 5 120 3 5 120 3 5 120 3 5 120 U1253B User s and Service Guide Specifications Table 7 3 Accuracy specifications of reading number of LSD for true RMS AC current Function Range Resolution 500 00 pA P 0 01 pA 5000 0 pA 0 1 pA 50 000 mA 0 001 mA Current 440 00 mA 0 01 mA 5 0000 A 0 0001 A 10 000 A 0 001 A Notes for AC current specifications 20 Hz to 45 Hz 1 0 20 1 0 20 1 0 20 1 0 20 1 5 20 6 1 5 20 61 1 These specifications are defined for signal input gt 5 of range 2 Current can be measured from 2 5 A up to 10 A continuously An additional 0 5 needs to be added to the specified accuracy if the signal measured Is in the range of 10 A to 20 A for 30 seconds maximum After measuring a current of Accuracy 112 45 Hz to 1 kHz 0 7 20 0 7 20 0 7 20 0 7 20 0 7 20 0 7 20 1 kHz to 20 kHz 3 0 75 20 0 75 20 0 75 20 1 5 20 3 60 lt 3A 5kHz 5 80 5 80 5 80 5 80 7 20 kHz to 100 kHz BIA gt 10 A it is recommended that the meter is left to cool down in switched OFF state for twice the length of measurement time used before using it again to make low current measurement These specifications are for typical performan
12. Category IV 600 V Pollution Degree 2 standards U1253B User s and Service Guide 3 1 Getting Started Check the shipment Verify that you have received the following items with your multimeter e 4 mm probes e Test leads e Alligator clips e Rechargeable 8 4 V battery e Power cord amp AC adapter e Quick Start Guide e Certificate of Calibration Contact your nearest Keysight Sales Office if any of the above are missing Inspect the shipping containing for damage Signs of damage may include a dented or torn shipping container or cushioning material that indicates signs of unusual stress or compacting Save the packaging material in case the multimeter needs to be returned Please refer to the Keysight Handheld Tools brochure 5989 7340EN for the full and latest list of handheld accessories available U1253B User s and Service Guide Getting Started 1 Adjusting the tilt stand U1253B User s and Service Guide To adjust the multimeter to a 60 standing position pull the tilt stand outward to its maximum reach IR USB cable host Tilt stand at 60 Figure 1 1 Tilt stand at 60 1 Getting Started To adjust the multimeter to a 30 standing position bend the tip of the stand so that it is parallel to ground then pull the stand outward to its maximum reach IR USB cable J PC host Tilt stand at 30 Figure 1 2 Tilt stand at 30 To adjust the multimeter to a hanging posit
13. DATA BIT Data bit length for remote communication with a PC Available options 8 bits or 7 bits stop bit is always 1 bit PARITY NONE Parity bit for remote communication with a PC Available options NONE ODD or EVEN ECHO OFF Return of characters to PC in remote communication Available options ON or OFF PRINT OFF Prints measured data to a PC in remote communication Available options ON or OFF REVISION OO NNNN Revision number Editing is disabled S N NNNNNNNN The last 8 digits of the serial number will be indicated Editing is disabled V ALERT OFF Audible alert tone for voltage measurement e To enable this function select an overvoltage value within the range of 1V to 1010 V e To disable this function set all digits to zero OFF will be indicated M INITIAL FACTORY Initial measurement functions Available options FACTORY or USER SMOOTH NORMAL Refresh rate for primary display readings Available options FAST NORMAL or SLOW DEFAULT Select YES then press Ce for longer than 1 second to reset the multimeter to its default factory settings BATTERY 7 2 V Battery type used for the multimeter Available options 7 2 V or 8 4 V DC FILTER Filter for DC voltage or DC current measurement Available options OFF or ON U1253B User s and Service Guide 91 4 Changing the Default Settings riae HARE Press ebetde gt HAND LOG TIME gt 000is LOG TIME gt 0001sS SE B iton e Ene fiton P
14. amp or gt to go to the digit you want to edit Press Hz to save and exit or press Esc to exit without saving Figure 4 4 Log time setup for interval time logging U1253B User s and Service Guide 95 4 Changing the Default Settings Setting dB measurement The decibel unit can be disabled by setting this to OFF The available options are dBm dBV and OFF For dBm measurement the reference impedance can be set by the dBm R menu item RHOL OD Tie LO Lob TIME det dEm F HEHEHE gt PaO gt HANMT gt HOOLS gt kine ae e P5 a y EIT RHOL TD gt FAO Press Hz L G gt HANT to edit mie TIHE 00015 dBm k gt 00500 Press A or W to switch between dBm OFF and dBV Press Hz to save and exit or press ESC to exit without saving Figure 4 5 Decibel measurement setup U1253B User s and Service Guide Changing the Default Settings 4 Setting reference impedance for dBm measurement The reference impedance for dBm measurement can be set to any value within the range of 1 to 9999 Q The default value is 50 Q Press Hz to edit Press A or YW to edit the value Press or to go to the digit you want to edit Press Hz to save and exit or press Esc to exit without saving Figure 4 6 Setting up the reference impedance for dBm unit U1253B User s and Service Guide 97 4 Changing
15. appears for 3 seconds Press or to select digit Press Wr or A to edit selected digit Press Save when done Incorrect security code a Security code is correct The word PASS appears for 3 seconds then proceeds to the first calibration item Figure 6 4 Unsecuring the instrument for calibration 160 U1253B User s and Service Guide Performance Tests and Calibration 6 Changing Calibration Security Code U1253B User s and Service Guide From front panel 1 After unsecuring the instrument press for more than 1 second to enter Calibration Security Code setting mode The existing code will be shown on the secondary display for example CSC C 1234 where the character C signifies change Press or to start and choose which digit to edit and press or W to edit the value To exit without changing the code press for more than 1 second 4 Press Cz Save to save the new security code If the new calibration security code has been successfully stored the upper left corner of the secondary display will momentarily show the word PASS Please refer to Figure 6 5 on page 162 161 6 Performance Tests and Calibration Press View gt 1 second Press 4 or gt to select digit Press W or to edit selected digit Press Save when done New security code
16. calibration count and record it for maintenance purpose The calibration count increases up to a maximum of 65535 after which it wraps around to 0 There is no way to program or reset the calibration count It is an independent electronic serialization value To view the present calibration count unsecure the instrument from the front panel see Unsecuring the instrument for calibration on page 158 and then press to view the calibration count Press again to exit the calibration count display U1253B User s and Service Guide Performance Tests and Calibration 6 Calibration error codes Table 6 5 below lists the various error codes for the calibration process Table 6 5 Calibration error codes and their respective meanings ER005 Calibration error Value out of range ER006 Calibration error Signal measurement out of range ER007 Calibration error Frequency out of range EEPROM write failure U1253B User s and Service Guide 179 6 Performance Tests and Calibration THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 180 U1253B User s and Service Guide KEYSIGHT TECHNOLOGIES Keysight U1253B True RMS OLED Multimeter User s and Service Guide 7 Specifications Product Characteristics 182 Measurement Category 184 Measurement category definition 184 Specification Assumptions 185 Electrical Specifications 186 DC Specifications 186 AC Specifications 190 AC DC Specifications 192 Capacitance Spe
17. changed from Auto to 5000 uA e The F8 default measurement range for DC mA is changed from Auto to 50 mA e The F8A default measurement range for DC A is changed from Auto to 5 A e The F9 default output values for pulse width and duty cycle are both changed from the 128th step 0 8333 ms for pulse width and 50 000 for duty cycle to the 255th step 1 6601 ms for pulse width and 99 609 Fe gt CAP AUTO Edit initial functions F gt DOMA i and ranges Figure 4 28 Editing initial measurement function range and initial output values After making the desired changes press Cz to save the changes Press OQ exit the EDIT mode If you reset the multimeter to its default factory settings see Returning to default factory settings on page 120 your settings for M INITIAL will also revert to the factory defaults 118 U1253B User s and Service Guide Changing the Default Settings 4 Smooth refresh rate U1253B User s and Service Guide The SMOOTH mode FAST NORMAL or SLOW options is used to smoothen the refresh rate of the readings in order to reduce the impact of unexpected noise and helps to get a stable reading It applies to all measurement functions except capacitance and frequency counter including duty cycle and pulse width measurements The default option is NORMAL E ppg Press Hz to edit Press A or W to configur Press A or to conf
18. copper wire after performing calibration for resistance U1253B User s and Service Guide 169 6 Performance Tests and Calibration Calibration From Front Panel Calibration process The following general procedure is the recommended method to complete a full instrument calibration 1 Read and implement Test Considerations on page 150 2 Perform the verification tests refer to Table 6 2 on page 152 to characterize the instrument 3 Perform the calibration procedures refer to the Calibration procedures on page 171 see also Adjustment Considerations on page 165 4 Secure the instrument after calibration Take note of the new security code if it has been changed and the calibration count in the instrument maintenance records Make sure to quit the adjustment mode before switching off the instrument 170 U1253B User s and Service Guide Performance Tests and Calibration 6 Calibration procedures U1253B User s and Service Guide 1 Turn the rotary switch to the function you wish to calibrate Unsecure the U1253B true RMS OLED multimeter refer to Unsecuring the instrument for calibration on page 158 After verifying that the security code you entered is correct the instrument will display the reference input value of the next calibration item refer to Table 6 4 on page 174 for the list and sequence of all the calibration items on the secondary display after briefly showing PASS
19. count 178 Calibration errorcodes 1 9 U1253B User s and Service Guide 7 Specifications Product Characteristics 182 Measurement Category 184 Measurement category definition 184 Specification Assumptions 185 Electrical Specifications 186 DC Specifications 186 AC Specifications 190 AC DC Specifications 192 Capacitance Specifications 194 Temperature Specifications 195 Frequency Specifications 196 Duty Cycle and Pulse Width Specifications 196 Frequency Sensitivity Specifications 197 Peak Hold Specifications 198 Frequency Counter Specifications 199 Square Wave Output 200 Operating Specifications 201 Display update rate approximate 201 Inputimpedance 202 U1253B User s and Service Guide XV THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK XVI U1253B User s and Service Guide List of Figures U1253B User s and Service Guide Figure 1 1 Figure 1 2 Figure 1 3 Figure 1 4 Figure 1 5 Figure 1 6 Figure 1 Figure 1 8 Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 2 Figure 2 8 Figure 2 9 Figure 2 10 Figure 2 11 Figure 2 12 Figure 2 13 Figure 2 14 Figure 2 15 Figure 2 16 Figure 2 1 Figure 2 18 Figure 2 19 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Tilt stand at 60 5 Tilt stand at 30 6 Tilt stand at hanging position 7 U1253B front panel 8 Rear panel 9 Rotary switch 10 U1253B keypad 11 Connector terminals 27 Measuring AC voltage 31 Me
20. displayed until the lead is removed from the E CHG input terminal Refer to Figure 2 19 below Figure 2 19 Charge terminal alert 60 U1253B User s and Service Guide KEYSIGHT TECHNOLOGIES Keysight U1253B True RMS OLED Multimeter User s and Service Guide 3 Functions and Features Dynamic Recording 62 Data Hold Trigger Hold 64 Refresh Hold 66 Null Relative 68 Decibel Display 70 1 ms Peak Hold 73 Data Logging 75 Manual logging 75 Interval logging 77 Reviewing logged data 79 Square Wave Output 81 Remote Communication 85 This chapter contains information on the functions and features available for the U1253B true RMS OLED multimeter 3 Functions and Features Dynamic Recording 62 The Dynamic Recording mode can be used to detect intermittent turn on or turn off voltage current surges or to verify measurement performance without you being present during the process While the readings are being recorded you are free to perform other tasks The average reading is useful for smoothing out unstable inputs estimating the percentage of time a circuit is operating and verifying circuit performance The elapsed time is shown on the secondary display The maximum time is 99 999 seconds When this maximum time is exceeded OL is On on the display 1 Press u for more than 1 second to enter the Dynamic Recording mode The multimeter is now in Continuous mode or non data hold non trigger mode
21. lt 20 of U1253B accuracy spec Resistance Fluke 5520A lt 20 of U1253B accuracy spec AC voltage Fluke 5520A lt 20 of U1253B accuracy spec AC current Fluke 5520A lt 20 of U1253B accuracy spec Frequency Keysight 33250A lt 20 of U1253B accuracy spec Capacitance Fluke 5520A lt 20 of U1253B accuracy spec Duty cycle Fluke 5520A lt 20 of U1253B accuracy spec Nanosiemens Fluke 5520A lt 20 of U1253B accuracy spec Diode Fluke 5520A lt 20 of U1253B accuracy spec Frequency counter Keysight 33250A lt 20 of U1253B accuracy spec Temperature Fluke 5520A lt 20 of U1253B accuracy spec Square wave Short Battery level Keysight 53131A and Keysight 34401A lt 20 of U1253B accuracy spec Shorting plug dual banana plug with copper wire shorting the 2 terminals Fluke 5520A lt 20 of U1253B accuracy spec U1253B User s and Service Guide Performance Tests and Calibration 6 Basic Operating Tests These basic operating tests are for testing the basic operation of the instrument Repair is required if the instrument fails any of these basic operating tests Testing the display Press and hold the button while turning on the multimeter to view all the OLED pixels Check for dead pixels Figure 6 1 Displaying all OLED pixels U1253B User s and Service Guide 147 6 Performance Tests and Calibration Current terminals test This test determines whether the input warning for the current terminals is functioning p
22. set both the calibrator and meter with external reference without internal ambient compensation If both calibrator and meter are set with internal reference with internal ambient compensation there may be a deviation between the readings of the calibrator and the meter due to differences in ambient compensation between the two devices U1253B User s and Service Guide 195 7 Specifications Frequency Specifications Table 7 8 Frequency specifications Range Resolution Accuracy Minimum Input Frequency 1 99 999 Hz 0 001 Hz 0 02 3 21 999 99 Hz 0 01 Hz 9 9999 kHz 0 0001 kHz 0 02 3 1 Hz 99 999 kHz 0 001 kHz lt 600 kHz 999 99 kHz 0 01 kHz Notes for frequency specifications 1 The input signal is lower than the product of 20000000VxHz product of voltage amp frequency overload protection 1000 V 2 For non square wave signals an additional 5 counts need to be added 3 The multimeter will automatically select the most appropriate range when making frequency measurements Duty Cycle and Pulse Width Specifications Table 7 9 Duty cycle and pulse width specifications Function Mode Range Resolution Accuracy at full scale DC Coupling 0 01 to 99 99 0 3 per kHz 0 3 Duty cycle AC Coupling 5 to 95 0 3 per kHz 0 3 Notes for duty cycle specifications 1 The accuracy for duty cycle and pulse width is based on a 5 V square wave input into the DC 5 V range 2 For AC coupling the duty cycle range can be measure
23. sine wave Input range 20 Hz to 20 kHz 500 pA 100 pA 5000 pA 250 pA 50 mA 10 mA 440 mA 25 mA 5A 1A 10 A 2 5 A Notes for frequency sensitivity and trigger level specifications for current measurements 1 For maximum input please refer to AC current measurements Peak Hold Specifications Table 7 12 Peak hold specifications for dc voltage and current measurements Signal width Accuracy for DC mV V current Single event gt 1 ms 2 400 for all ranges Repetitive gt 250 us 2 1000 for all ranges 198 U1253B User s and Service Guide Specifications 7 Frequency Counter Specifications Table 7 13 Frequency counter divide by 1 specifications Range Resolution Accuracy Sensitivity Minimum input freq 99 999 Hz 0 001 Hz 0 02 31 999 99 Hz 0 01 Hz 100 mVrms 9 9999 kHz 0 0001 kHz 0 002 5 0 5 Hz 99 999 kHz 0 001 kHz lt 985 kHz 999 99 kHz 0 01 kHz 200 mVrsm Table 7 14 Frequency counter divide by 100 4 specifications Range Resolution Accuracy Sensitivity Minimum input freq 9 9999 MHz 0 0001 MHz 0 002 5 400 mVrms 1 MHz 99 999 MHz 0 001 MHz lt 20 MHz 600 mVrms Notes for frequency counter specifications 1 All frequency counters are susceptible to error when measuring low voltage low frequency signals Shielding inputs from picking up external noise is critical for minimizing measurements errors For non square wave signals an additional 5 counts needs to be added 2 The maximum measurement level i
24. the correct range as specified in the table 4 Check whether the measured reading falls within the specified error limits from the reference value If yes then this particular function and range does not require adjustment calibration If not then adjustment is necessary U1253B User s and Service Guide 151 6 Performance Tests and Calibration Table 6 2 Performance verification tests Reference n function signals values Turn the rotary switch to the 4 position 5 V 1 kHz 22 5 mV 5 V 10 kHz 79 0 mV 4 5 V 20 kHz 0 1695 V 4 5 V 30 kHz 0 1695 V 4 5 V 100 kHz 0 1695 V 50 V 1 kHz 225 0 mV 50 V 10 kHz 790 0 mV 45 V 20 kHz 1 695 V 45 V 30 kHz 1 695 V 45 V 100 kHz 1 695 V 500 V 1 kHz 2 25 V moov 100 vT wi Press Ge to switch to frequency mode Press Ge to switch to frequency mode to switch to frequency mode 9 9999 kHz 0 48 V 1 kHz 500 mHz 3 Press aaa to switch to duty cycle mode 0 01 to 5 0 Vpp 50 0 315 aaa 99 square wave 50 Hz Turn the rotary switch to the V position a 1 75 mV Press J to select DC V measurement 175 mV 500 V 500 V 200 mV 1000 V 1000 V 800 mV 152 U1253B User s and Service Guide Performance Tests and Calibration 6 Table 6 2 Performance verification tests continued Reference Test function Range signals values Press Q to select AC V measurement 1 5 V 1 kHz 22 5 mV 5 V 10 kHz 79 0 mV 4 5 V 20 kHz 169 5 mV 4 5 V 10
25. the measuring source This multimeter provides an overload alert for voltage measurement in both auto and manual range modes The multimeter starts beeping periodically once the measured voltage exceeds the V ALERT value set in the Setup mode Immediately remove the test leads from the source being measured By default this feature is turned off Be sure to set the alerting voltage according to your requirement The multimeter will also display de as an early warning for hazardous voltage when the measured voltage is equal to or greater than 30 V in all three DC V AC V and AC DC V measurement modes For a manually selected measurement range when the measured value is outside the range the display will indicate OL U1253B User s and Service Guide Making Measurements 2 Input warning The multimeter emits a continuous beep when the test lead is inserted to the A input terminal but the rotary switch is not set to the corresponding mA A position A warning message Error ON A INPUT will be displayed until the test lead is removed from the A input terminal Refer to Figure 2 18 Figure 2 18 Input terminal warning U1253B User s and Service Guide 59 2 Making Measurements Charge terminal alert The multimeter emits a continuous beep when the E CHG terminal detects a voltage level of more than 5 V and the OFF i rotary switch is not set to the corresponding ScHG position A warning message Error ON mA INPUT will be
26. to select the calibration item if not performing the complete set of calibration After successfully calibrating an item the multimeter will automatically proceed to the next item 2 Both AC V positions must be calibrated individually 3 The minimum AC current output of the Fluke 5520A calibrator is 29 0 uA therefore an output of at least 30 0 uA must be set for the calibrator 4 Besure to recalibrate the Short using the dual banana plug with copper wire after performing calibration for resistance 5 Ensure that the multimeter is turned on and stabilized for at least 60 minutes with the K type thermocouple connected between the multimeter and the calibrator out terminal U1253B User s and Service Guide 177 178 Performance Tests and Calibration Calibration count The calibration count feature provides an independent serialization of your calibrations With it you can determine the number of times your instrument has been calibrated By monitoring the calibration count you can tell whether an unauthorized calibration has been performed The value will increment by one each time the instrument is calibrated The calibration count is stored in a nonvolatile EEPROM memory the contents of which do not change even after the instrument is switched off or after a remote interface reset Your U1253B true RMS OLED multimeter had been calibrated before leaving the factory When you receive your multimeter make sure to read the
27. 0 V 1 kHz 0 3 V 1 kHz with rotary switch at 3 0000 V 1 kHz 3 V 1 kHz yy 2 ow V and ASV 3 0000 V 10 kHz 3 V 10 kHz 3 000 V 1 kHz 3 V 1 kHz 30 000 V 1 kHz 30 V 1 kHz 30 000 V 10 kHz 30 V 10 kHz 30 00 V 1 kHz 30 V 1 kHz 300 00 V 1 kHz 300 V 1 kHz 300 00 V 10 kHz 300 V 10 kHz 30 0 V 1 kHz 30 V 1 kHz 300 0 V 1 kHz 300 V 1 kHz 300 0 V 10 kHz 300 V 10 kHz done for this function change rotary switch position or press to select the next function that requires calibration Short SHORT Dual banana shorting plug with 500 V 300 00 V 300 V 1000 V 1000 0 V 1000 V done Short SHORT Dual banana shorting plug with a 500mv mV 30000mV 00 mV C mV mV 0 mV a mV done 174 U1253B User s and Service Guide Performance Tests and Calibration 6 Table 6 4 List of calibration items continued 3 000 mV 1 kHz 3 mV 1 kHz 30 000 mV 1 kHz 30 mV 1 kHz 30 000 mV 10 kHz 30 mV 10 kHz 30 00 mV 1 kHz 30 mV 1 kHz 300 00 mV 1 kHz 300 mV 1 kHz 300 00 mV 10 kHz 300 mV 10 kHz 1000 mV 300 0 mV 1 kHz 300 mV 1 kHz 1000 0 mV 1 kHz 1000 mV 1 kHz 1000 0 mV 10 kHz 1000 mV 10 kHz done Resistance Short SHORT Dual banana shorting plug with copper wire 50 MQ OPEN Unplug all test leads or shorting plug and leave the terminals open 10 000 MQ 10 MQ 500 Q 300 00 Q 300 Q done Diode Short SHORT Dual banana shorting plug with ee U1253B
28. 0 kHz 169 5 mV 50 V 1 kHz 225 mV 50 V 10 kHz 790 mV 45 V 20 kHz 1 695 V 45 V 100 kHz 1 695 V 500 V 500 V 1 kHz 2 25 V mov 1000 1 Turn the rotary switch to the gt mV position 50m mV 50m mV Ba Ba 2 Press J to select DC mV measurement mV a mV 175 uV 500 mV 175 uV 1000 mV 1000 mV 0 75 mV 1000 mV 0 75 mV U1253B User s and Service Guide 153 6 Performance Tests and Calibration Table 6 2 Performance verification tests continued Reference Test function Range signals values Press Q to select AC mV measurement 1 50 mV 1 kHz 0 24 mV 50 mV 10 kHz 0 39 mV 45 mV 20 kHz 1 695 mV 45 mV 30 kHz 1 695 mV 45 mV 100 kHz 1 695 mV 500 mV 45 Hz 2 25 mV 500 mV 1 kHz 2 25 mV 500 mV 10 kHz 2 25 mV 450 mV 20 kHz 16 95 mV 450 mV 30 kHz 16 95 mV 450 mV 100 kHz 16 95 mV 1000 mV 1000 mV 1 kHz 6 5 mV 1000 mV 10 kHz 11 5 mV 1000 mV 20 kHz 47 mV 1000 mV 30 kHz 47 mV 1000 mv 100 kHz 47 mV 500 Q 350 mQ P Turn the rotary switch to the nS a position 500 kQ 500 kQ 300 Q 50 MQ 50 MQ 505 KQ 500 MQ 450 MQ 36 10 MQ Press e to select conductance nS 500 ns P 50 nS 0 6 nS e Turn the rotary switch to the position Diode 154 U1253B User s and Service Guide Performance Tests and Calibration 6 Table 6 2 Performance verification tests continued Reference ee function Range signals values 133250 output 33250A outpu
29. 1 MQ 0 01 MQ 0 01 nS Test Current or Burden Voltage 1 04 mA 416 pA 41 2 pA 4 12 pA 375 nA 10 MQ 187 nA 10 MQ 187 nA 10 MQ 187 nA Specifications Accuracy 0 05 10 0 05 5 0 05 5 0 05 5 0 15 5 1 00 5 3 00 10 lt 200 M 8 00 10 gt 200 M 1 10 3 The accuracy of 500 Q and 5 kQ is specified after applying the Null function which is used to subtract the test lead resistance and the thermal effect u o Aa Maximum open voltage lt 4 2 V U1253B User s and Service Guide For the range of 50 M amp 2 500 MQ the relative humidity is specified for lt 60 The accuracy is specified for lt 50 nS after applying the Null function with open test lead These specifications are defined for 2 wire ohms using Math Null Without Math Null add 0 2 Q additional error 7 187 7 Specifications Table 7 1 DC accuracy of reading number of LSD continued Function Range Resolution Test Current or Burden Accuracy Voltage 500 00 pA 0 01 pA lt 0 06 V 0 05 5 P 5000 0 pA 0 1 pA 0 6 V 0 05 5 P 50 000 mA 0 001 mA 0 09 V 0 15 5 P Current 440 00 mA 0 01 mA 0 9 V 0 15 5 0 5 0000 A 0 0001 A 0 2 V 0 30 10 10 000 A 0 001 A 04V 0 30 5 Notes for DC current specifications 8 Current can be measured up to 10 A continuously An additional 0 5 needs to be added to the specified accuracy if the signal measured is in the range of 10 A to 20 A for 30 seconds maximum After measuring a cu
30. 110 1400 440 mA 1000 V dnm om Fast blow fuse 2110 1402 11 A 1000 V idem semi Figure 5 9 Fuse replacement 138 U1253B User s and Service Guide Maintenance 5 Troubleshooting U1253B User s and Service Guide To avoid electric shock do not perform any servicing unless you are qualified to do so If the instrument fails to operate check the battery and test leads Replace them if necessary After that if the instrument still does not function check to ensure that you have followed the operating procedures given in this instruction manual before considering servicing the instrument When servicing the instrument use only the specified replacement parts Table 5 5 on page 140 will assist you in identifying some basic problems and their solutions 139 5 Maintenance Table 5 5 Basic troubleshooting procedures No OLED display after switching ON e Check battery Charge or replace battery No beeper tone e Check the Setup mode to verify whether the beeper function has been set to OFF If so select the desired driving frequency Failed to measure current e Check the fuse No charging indication 1 e Check 440 mA fuse Check external DC adapter to ensure that its output is DC 24 V and that the plugs are inserted properly into the charging terminals Battery life very short after full Check if the correct rechargeable battery is used charge Battery not able to charge Check if the correct nominal voltage level 7 2 V or
31. 253B true RMS OLED multimeter 4 Changing the Default Settings This chapter will show you how to change the default factory settings of the U1253B true RMS OLED multimeter and other available setting options 5h Maintenance This chapter will help you to troubleshoot if the U1253B true RMS OLED multimeter malfunctions 6 Performance Tests and Calibration This chapter contains the performance test and adjustment procedures 7 Specifications This chapter lists the product characteristics specification assumptions and the specifications of the U1253B true RMS OLED multimeter U1253B User s and Service Guide IX Declaration of Conformity DoC The Declaration of Conformity DoC for this instrument is available on the Keysight Web site You can search the DoC by its product model or description at the Web address below http www keysight com go conformity If you are unable to search for the respective DoC please contact your local Keysight representative U1253B User s and Service Guide Contents U1253B User s and Service Guide Getting Started Introducing the Keysight U1253B True RMS OLED Multimeter 2 Check the shipment 4 Adjusting the tilt stand 5 The front panel ata glance 8 The rear panel ata glance 9 The rotary switch ata glance 10 The keypad ata glance 11 The display ata glance 14 Selecting display with the Shift button 20 Selecting display with the Dual button 22 Selecting display with the Hz butt
32. 8 4 V is selected in the after pro long storage period battery setting at Setup Mode Try to charge and discharge for 2 or 3 cycles in order to maintain the battery s highest capacity NOTE The performance of the rechargeable battery may degrade with time Remote control failure The Keysight logo on the IR USB cable connected to the multimeter should be facing up Check the baud rate parity data bit and stop bit default is 9600 None 8 and 1 in the Setup mode Ensure that the required driver for IR USB has been installed Notes for basic troubleshooting procedures table 1 Never turn the rotary switch of the multimeter from the OFF position when it is charging 140 U1253B User s and Service Guide Maintenance 5 Replaceable Parts This section contains information for ordering replacement parts for your instrument You can find the instrument support part list at Keysight s Test amp Measurement Parts Catalog at http www keysight com find parts This parts list includes a brief description of each part with applicable Keysight part number To order replaceable parts You can order replaceable parts from Keysight using the Keysight part number Note that not all parts listed are available as field replaceable parts To order replaceable parts from Keysight do the following 1 Contact your nearest Keysight Sales Office or Service Center 2 Identify the parts by the Keysight part number shown in the support parts
33. 99 9 U1253B User s and Service Guide 37 2 Making Measurements 1 1 KK YS px N j N L A CAT IV 600 v V4 CAT III 1000 V MA SQ XQ N Red Lead Figure 2 4 Measurement scale of 4 mA to 20 mA 38 U1253B User s and Service Guide Making Measurements 2 A ampere measurement Set up the multimeter to measure A ampere as shown in Figure 2 5 Probe the test points and read the display Connect the red and black test leads to 10 A input terminals A red and COM black respectively The multimeter is set to ii measurement automatically when the red test lead is plugged into the A red terminal A CAT IV 600 V CAT IlI 1000 V Black Lead Red Lead Figure 2 5 A ampere current measurement U1253B User s and Service Guide 39 2 Making Measurements Frequency Counter 40 WARNING e Use the frequency counter only for low voltage applications Never use the frequency counter on an AC power line system For input more than 30 Vpp you are required to use frequency measurement mode available under the current or voltage measurement instead of frequency counter Set up the multimeter to measure frequency as shown in Figure 2 6 Probe the test points and read the display default input signal frequency is divided by 1 This allows signals of up to a maximum frequency of 985 kHz to be measured e Ifthe reading is unstable or zero press to select division of inp
34. Audible continuity In the range of 500 Q range the beeper will emit a sound if the resistance value falls below 10 Q For other ranges the beeper will emit a sound if the resistance falls below the typical values listed in Table 2 3 below Table 2 3 Audible continuity measurement range ee ee ee sw When testing continuity you can choose to test either short continuity or open continuity By default the multimeter is set to short continuity e Press to select open continuity U1253B User s and Service Guide U1253B User s and Service Guide Making Measurements 2 Short continuity Press Open continuity Figure 2 10 Short continuity and open continuity test Conductance Set up the multimeter to measure conductance as shown in Figure 2 11 Probe the test points and read the display The conductance measurement function makes it easier to measure very high resistance of up to 100 GQ As high resistance readings are susceptible to noise you can capture average readings using the Dynamic Recording mode Refer to the section Dynamic Recording on page 62 for more information 4 2 Making Measurements A CAT IV 600 V CAT Ill 1000 V 10A MAX FUSED F A A Black Lead Figure 2 11 Conductance measurement 48 U1253B User s and Service Guide Testing Diodes CAUTION U1253B User s and Service Guide Making Measurements 2 Disconnect circuit power and di
35. C and 28 C Ideally calibration should be performed at 23 C 1 C e Ensure that ambient relative humidity is less than 80 e Allow a warm up period of 5 minutes e Use shielded twisted pair PTFE insulated cables to reduce settling and noise errors Keep the input cables as short as possible 150 U1253B User s and Service Guide Performance Tests and Calibration 6 Performance Verification Tests Use the following performance verification tests to verify the measurement performance of the U1253B true RMS OLED multimeter These performance verification tests are based on the specifications listed in the instrument data sheet These performance verification tests are recommended as acceptance tests when you first receive the instrument After acceptance you should repeat the performance verification tests at every calibration interval to be performed before calibration to identify which measurement functions and ranges require calibration Carry out the performance verification tests according to Table 6 2 on page 152 For every listed step 1 Connect the calibration standard terminals to the appropriate terminals on the U1253B true RMS OLED multimeter 2 Set up the calibration standard with the signals specified in the Reference signals values column one setting at a time if more than one setting is listed 3 Turn the rotary switch of the U1253B true RMS OLED multimeter to the function being tested and choose
36. Filter e When the Filter is enabled the measurement speed may decrease during DC voltage measurement e During AC or Hz measurement on primary or secondary display DC filter will be automatically disabled 122 U1253B User s and Service Guide KEYSIGHT TECHNOLOGIES Keysight U1253B True RMS OLED Multimeter User s and Service Guide 5 Maintenance Introduction 124 General maintenance 124 Battery replacement 125 Storage considerations 127 Charging the battery 128 Fuse checking procedure 135 Fuse replacement 137 Troubleshooting 139 Replaceable Parts 141 To order replaceable parts 141 This chapter will help you to troubleshoot if the U1253B true RMS OLED multimeter malfunctions 5 Maintenance Introduction CAUTION Any repair or service which is not covered in this manual should only be performed by qualified personnel General maintenance WARNING Ensure that terminal connections are correct for a particular measurement before making the measurement To avoid damaging the device do not exceed the rated input limit Dirt or moisture in the terminals can distort readings Cleaning procedures are as follows 1 Turn the multimeter off and remove the test leads 2 Turn the multimeter over and shake out any dirt that may have accumulated in the terminals 3 Wipe the case with a damp cloth and mild detergent do not use abrasives or solvents Wipe the contacts in each terminal with a clean cotton sw
37. For lt gt V press Q to select AC voltage A VNV Default is DC voltage V Press O twice to select AC DC voltage AT mV Default is DC voltage U1253B User s and Service Guide Frequency Hz Pulse width ms ACV Duty cycle Primary display Secondary display Duty cycle 25 1 Getting Started Table 1 9 Selecting display with the Hz button continued Rotary switch position Function AT mV Press Q to select AC voltage AT mV Press OQO twice to select AC DC voltage LA AS Default is DC current LA AS Press CD to select AC current LA AS Press OQO twice to select AC DC current mA A Default is DC current mA A Press Q to select AC current mA A Press OQO twice to select AC DC current 26 Primary display Frequency Hz Pulse width ms Duty cycle Frequency Hz Pulse width ms Duty cycle Frequency Hz Pulse width ms Duty cycle Frequency Hz Pulse width ms Duty cycle Frequency Hz Pulse width ms Duty cycle Frequency Hz Pulse width ms Duty cycle Frequency Hz Pulse width ms Duty cycle Frequency Hz Pulse width ms Duty cycle Secondary display U1253B User s and Service Guide Getting Started 1 Table 1 9 Selecting display with the Hz button continued Pulse width ms Hz Frequency counter Only applicable for Divide 1 input Frequency Hz Th
38. HARGE ERROR message is displayed check whether the battery is the specified type For the correct battery type refer to List of compatible batteries for the Keysight U1253B on page 127 Please ensure that the battery in the multimeter is the specified type of rechargeable battery before charging it After replacing any wrong battery with the correct specified type of rechargeable battery press Q to redo the self test Replace with a new battery if the CHARGE ERROR message is again displayed Figure 5 5 Charging mode 7 The smart charging mode will start if the battery passes the self test The charging time is limited to within 220 minutes This ensures that the battery will not be charged for more than 220 minutes The display will count down the charging time When battery charging is in progress none of the push buttons can be operated To avoid overcharging the battery the charging may be stopped with an error message during the charging process U1253B User s and Service Guide Maintenance 5 Figure 5 6 Fully charged and in the trickle state 8 Once the charging is completed the FULLY CHARGED message will be displayed A trickle charging current will be drawn to maintain the battery capacity 9 Remove the DC adapter when the battery has been fully charged CAUTION Do not turn the rotary switch before removing the adapter from the terminals U1253B User s and Service Guide 133 5 134 Maintenance
39. Hold when in Negative P HOLD will change the display into Positive P HOLD Figure 3 7 74 1 ms peak hold mode operation U1253B User s and Service Guide Data Logging Functions and Features 3 The data logging function provides the convenience of recording test data for future review or analysis Since data is stored in nonvolatile memory the data remains saved when the multimeter is turned OFF or the battery is changed The two options offered are manual hand logging and interval time logging functions which is determined in the Setup mode Data logging records the values on the primary display only Manual logging U1253B User s and Service Guide Firstly ensure that manual hand logging is specified in Setup mode 1 Press Cz for more than 1 second to store the present value and function on the primary display to the non volatile memory The i tr and the logging index will be displayed for 3 seconds 2 Press and hold Cz again for the next value that you would like to save into the memory 75 3 Functions and Features Press Log for gt 1 sec Press Log for gt 1 sec again to log each data Display returns to normal automatically after 3 seconds Figure 3 8 Manual hand logging mode operation The maximum number of readings that can be stored is 100 entries When the 100 entries are all occupied the logging index will indicat
40. Keysight U1253B True RMS OLED Multimeter User s and KEYSIGHT Service Guide TECHNOLOGIES NOTICE This document contains references to Agilent Technologies Agilent s former Test and Measurement business has become Keysight Technologies For more information go to www keysight com KEYSIGHT TECHNOLOGIES U1253B User s and Service Guide Notices Keysight Technologies 2009 2015 No part of this manual may be reproduced in any form or by any means including elec tronic storage and retrieval or translation into a foreign language without prior agree ment and written consent from Keysight Technologies as governed by United States and international copyright laws Manual Part Number U1253 90035 Edition Edition 13 July 10 2015 Keysight Technologies 1400 Fountaingrove Parkway Santa Rosa CA 95403 Trademark Acknowledgements Pentium is a U S registered trademark of Intel Corporation Microsoft Visual Studio Windows and MS Windows are trademarks of Microsoft Cor poration in the United States and or other countries Accessories Warranty Keysight offers warranty for product s accessories for up to 3 months from the end user acceptance date Standard Calibration Service optional Keysight offers an optional calibration ser vice contract for a period of 3 years from end user acceptance date Warranty The material contained in this docu ment is provided as is and is sub jec
41. User s and Service Guide 175 6 Performance Tests and Calibration Table 6 4 List of calibration items continued O Faon ange eatin tam petere O plug and leave the terminals open 10 nF 3 000 nF 3 nF a 100 nF 10 00 nF 10 nF a 1000 nF 100 0 nF 100 nF a O OW WE S o o C oou 10 uF 10 000 uF 10 uF 100 uF 100 00 uF 100 uF 1000 uF 1000 0 uF 1000 uF done Temperature 5 K type 0000 0 C 0 C ee ee plug and leave the terminals open done 300 00 uA 1 kHz 300 WA 1 kHz 5000 uA 300 0 uA 1 kHz 300 uA 1 kHz 3000 0 uA 1 kHz 3000 uA 1 kHz done 176 U1253B User s and Service Guide Performance Tests and Calibration 6 Table 6 4 List of calibration items continued DC mA DCA Open for all ranges OPEN SS all test leads or shorting nn and leave the terminals open 500 mA 300 00 mA a mA Move the positive test lead from the UA mA terminal to the A terminal Caution Connect the calibrator to the multimeters A and COM terminals before applying 3 A and 10 A p BA 300008 0000 A e e done 30 000 mA 1 kHz 30 mA 1 kHz 300 00 mA 1 kHz 300 mA 1 kHz Move the positive test lead from the UA mA terminal to the A terminal Caution Connect the calibrator to the multimeters A and COM terminals before applying 3 A and 10 A 5A 0 3000 A 1 kHz 0 3 A 1 kHz 3 0000 A 1 kHz 3 A 1 kHz 3 000 A 1 kHz 3 A 1 kHz 10 000 A 1 kHz 10 A 1 kHz done Notes for list of calibration items 1 Press or
42. ab moistened with alcohol 124 U1253B User s and Service Guide Maintenance 5 Battery replacement This multimeter is powered by a 9 V Ni MH rechargeable battery 7 2 nominal voltage or 9 V Ni MH rechargeable battery 8 4 V nominal voltage Use only the specified type refer to Figure 5 1 below Alternatively you may also use a 9 V Alkaline battery ANSI NEDA 1604A or IEC 6LR61 or a 9 V Carbon zinc battery ANSI NEDA 1604D or IEC6F22 to power the U1253B To ensure that the multimeter performs as specified it is recommended that you replace the battery as soon as the low battery indicator is displayed flashing If your multimeter has a rechargeable battery inside please go to Charging the battery on page 128 The procedures for battery replacement are as follows The U1253B comes supplied with a 9 V Ni MH rechargeable battery 8 4 V nominal voltage Figure 5 1 9 V rectangular battery U1253B User s and Service Guide 125 5 Maintenance 1 On the rear panel turn the screw on the battery cover counterclockwise from the LOCK position to OPEN Figure 5 2 Rear panel of the Keysight U1253B True RMS OLED Multime ter 2 Slide the battery cover down 3 Lift the battery cover up 4 Replace with the specified battery 5 Reverse the procedures of opening the cover to close it 126 U1253B User s and Service Guide Maintenance 5 List of compatible batteries for the Keysight U1253B
43. al measurement functions and range can be set according to Table 4 2 below Table 4 2 Available settings for M initial 3 F4 l Ohm nS Auto or manual ranges Q F5 Diode frequency counter No range setting ape Duty cycle N 256 x 100 Pulse width N 256 x 1 frequency 29 different frequencies Each rotary switch position is assigned a default measurement function and a default measurement range Hz As example when you turn the rotary switch to the position the initial measurement function is diode measurement according to the default factory setting In order to choose the frequency counter function you require press the CD button U1253B User s and Service Guide 115 4 116 Changing the Default Settings For another example when you turn the rotary switch to the ex Y position the initial measurement range is Auto according to default factory setting In order to choose a different range you will have to press the button If you prefer to have a different set of initial measurement functions change the M INITIAL setting to USER and press the Cr button The multimeter will then enter the INIT pages Please refer to Figure 4 25 to edit Press A or Y to switch between FACTORY and USER If FACTORY If USER is selected is selected Press Hz to save Press Hz to proceed and exit to INIT pages for setting up initial measurement Figure 4 25 Setting initial measurement funct
44. asuring DC voltage 33 Measuring uA and mA current 36 Measurement scale of 4mAto20mA_ 38 A ampere current measurement 39 Measuring frequency 41 Type of display when Smart Q is enabled 43 Measuring resistance 44 Resistance audible continuity and conductance tests 45 Short continuity and open continuity test 47 Conductance measurement 48 Measuring the forward bias of a diode 50 Measuring the reverse bias of adiode 51 Capacitance measurements 53 Connecting the thermal probe into the non compensa tion transfer adapter 55 Connecting the probe with adapter into the multimeter 55 Surface temperature measurement 5 Input terminal warning 59 Charge terminal alert 60 Dynamic recording mode operation 63 Data hold mode operation 65 Refresh hold mode operation 67 Null relative mode operation 69 dBm display mode operation 71 dBV display mode operation 72 XVII XVIII Figure 3 Figure 3 8 Figure 3 9 Figure 3 10 Figure 3 11 Figure 3 12 Figure 3 13 Figure 3 14 Figure 3 15 Figure 4 1 Figure 4 2 Figure 4 3 Figure 4 4 Figure 4 5 Figure 4 6 Figure 4 Figure 4 8 Figure 4 9 Figure 4 10 Figure 4 11 Figure 4 12 Figure 4 13 Figure 4 14 Figure 4 15 Figure 4 16 Figure 4 17 Figure 4 18 Figure 4 19 Figure 4 20 Figure 4 21 Figure 4 22 Figure 4 23 Figure 4 24 Figure 4 25 Figure 4 26 Figure 4 27 Figure 4 28 1 ms peak hold mode operation 74 Manual hand logging mode operation 76 Fulllog 76 Interval time logging
45. based on bias voltage and corrected resistance value on the secondary display With offset compensation method the multimeter takes the difference between two resistance measurements when two different test currents are applied to determine any offset voltage in the input circuitry The resultant displayed measurement corrects this offset giving a more accurate resistance measurement U1253B User s and Service Guide Making Measurements 2 The Smart Q is applicable for 500 Q 5 kQ 50 kQ and 500 kQ resistance range only The maximum correctable offset bias voltage is 1 9 V for 500 Q range and 0 35 V for 5 KQ 50 KQ and 500 kQ range e Press bua to enable Smart Q feature Press pua again to cycle through Bias display or Leak display e Press bua for more than one second to disable Smart Q feature The measurement time increases when Smart Q is enabled Bias display Press Leak display Figure 2 7 Type of display when Smart Q is enabled U1253B User s and Service Guide 43 2 Making Measurements i ROO tirlsseebsseebsess Be GUTS A CAT IV 600 V CAT IlI 1000 V 10A MAX FUSED j F Black Lead Figure 2 8 Measuring resistance 44 U1253B User s and Service Guide Making Measurements 2 Resistance Conductance Figure 2 9 Resistance audible continuity and conductance tests U1253B User s and Service Guide 45 2 46 Making Measurements
46. be set to either 8 or 7 bits The number of stop bit is always 1 and this cannot be changed Press HZ f to edit Press A or Y to switch between 7 and 8 Press Hz to save and exit or press Esc to exit without saving Figure 4 18 Data bits setup for remote control U1253B User s and Service Guide 109 4 Changing the Default Settings Setting parity check The parity check for remote communication with a PC can be set to either NONE ODD or EVEN Press Hz k BTA to edit j Press A or Y to configur i Press or Y Press Hz to save and exit or press Esc to exit without saving Figure 4 19 Parity check setup for remote control 110 U1253B User s and Service Guide Changing the Default Settings 4 Setting echo mode e Turning echo mode to ON enables the transmitted characters to be echoed on the PC in remote communication e This is useful when developing PC programs which use SCPI commands It is recommended that you disable this function during normal operation Press Hz to edit Press A or W to switch between OFF and ON t Press Hz to save and exit or press Esc to exit without saving Figure 4 20 Echo mode setup for remote control U1253B User s and Service Guide 111 4 Changing the Default Settings Setting print mode Turning print mode ON enables the printing of measured
47. ccuracy Short the test leads and press once the displayed value is stable to zero adjust the display 68 U1253B User s and Service Guide Functions and Features 3 rif Press Null while O BASE is being displayed to exit this mode Press Auto return Null after 3 seconds Figure 3 4 Null relative mode operation U1253B User s and Service Guide 69 3 Functions and Features Decibel Display 70 The dBm unit calculates the power delivered to a reference resistance relative to 1 mW and can be applied to DC V AC V and AC DC V measurements for decibel conversion Voltage measurement is converted to dBm using the following formula 1000 x measured voltage dBm 10log ___ reference impedance 1 The reference impedance may be specified from 1 Q to 9999 Q in Setup mode The default value is 50 Q The dBV unit calculates the voltage with respect to 1 V The formula is as shown below dBV 20log measured voltage 2 1 With the rotary switch set at ww V N or AT MV press to navigate to dBm or ABV measurement on the primary display The voltage measurement is indicated on the secondary display 2 Press for more than 1 second to exit this mode 1 Depends on configuration in Setup mode U1253B User s and Service Guide Functions and Features 3 Press Dual for gt 1 sec Press Press Dual Dual Figure 3 5 dBm display mode o
48. ce Additional error to be added for frequency gt 15 kHz and signal input lt 10 of range 3 counts of LSD per kHz Input current gt 35 pArms Input current lt 3 Arms oOo o1 U1253B User s and Service Guide 191 7 Specifications AC DC Specifications Table 7 4 Accuracy specifications of reading number of LSD for AC DC voltage Function Range 4 50 000 mV 500 00 mV 1000 0 mV Voltage 5 0000 V 50 000 V 500 00 V 1000 0 V Resolution 0 001 mV 0 01 mV 0 1 mV 0 0001 V 0 001 V 0 01 V 0 1 V Notes for AC DC voltage specifications 1 Input impedance Refer to Table 7 17 2 These specifications are defined for signal input gt 5 of range 3 Additional error to be added for frequency gt 15 kHz and signal input lt 10 of range 3 counts of LSD per kHz 4 2 over range on all ranges except AC 1000V 192 30 Hz to 45 Hz 1 5 80 1 5 65 1 5 65 1 5 65 1 5 65 1 5 65 1 5 65 Accuracy for AC DC voltage 45 Hz to 1 kHz 0 4 60 0 4 30 0 4 30 0 4 30 0 4 30 0 4 30 0 4 45 1 kHz to 5 kHz 0 7 60 0 4 30 0 4 30 0 6 30 0 4 30 0 4 30 0 4 45 U1253B User s and Service Guide 5 kHz to 15 kHz 0 8 60 0 8 45 0 8 45 1 5 45 1 5 45 15 kHz to 100 kHz l 3 5 220 3 5 125 3 5 125 3 5 125 3 5 125 Specifications 7 Table 7 5 Accuracy specifications of reading number of LSD for AC DC current Accuracy
49. cifications 194 Temperature Specifications 195 Frequency Specifications 196 Duty Cycle and Pulse Width Specifications 196 Frequency Sensitivity Specifications 197 Peak Hold Specifications 198 Frequency Counter Specifications 199 Square Wave Output 200 Operating Specifications 201 Display update rate approximate 201 Inputimpedance 202 This chapter lists the product characteristics specification assumptions and the specifications of the U1253B true RMS OLED multimeter 7 Specifications Product Characteristics POWER SUPPLY Battery type e 9V size Ni MH rechargeable battery 7 2 V nominal voltage e 9V size Ni MH rechargeable battery 8 4 V nominal voltage e 9V Alkaline battery ANSI NEDA 1604A or IEC 6LR61 e 9V Carbon zinc battery ANSI NEDA 1604D or IEC6F22 Battery life e 7 hours typical based on a fully charged Ni MH 250 mAH battery for DC voltage measurement e 14 hours typical based on a new 9 V Alkaline battery for DC voltage measurement Charge time e Less than 220 minutes in an environment of 10 C to 30 C if the battery has been deep discharged a prolonged charging time is required in order for the battery to return to full capacity POWER CONSUMPTION 420 mVA maximum DISPLAY e Graphical orange OLED organic light emitting diode display with maximum reading of 51 000 counts e Automatic polarity indication OPERATING ENVIRONMENT e Temperature Full accuracy from 20 C to 55 C e Humidit
50. cording to your desired measurement Set the rotary switch to i For voltage measurements or rd xy Il For current measurements Ka Or A 2 Press the Ge S28 key twice to cycle the measurement function to the AC DC mode Probe the test points and read the display For better accuracy when measuring the DC offset of an AC voltage measure the AC voltage first Note the AC voltage range then manually select a DC voltage range equal to or higher than the AC range This procedure improves the accuracy of the DC measurement by ensuring that the input protection circuits are not activated e Press to cycle through the available dual display combinations Press to enable the frequency test mode for voltage measurements See Frequency Counter on page 40 to learn more 34 U1253B User s and Service Guide Making Measurements 2 Measuring Current pA and mA measurement Set up your multimeter to measure uA and mA as shown in Figure 2 3 Probe the test and read the display e Press CD to cycle between DC AC AC DC and scale current measurements e For uA measurement set the rotary switch to pA 53 and connect the positive test lead to UA mA For mA measurement set the rotary switch to mA A gt and connect the positive test lead to UA mA e For A ampere measurement set the rotary switch to mA A 53 and connect the positive test lead to A e Press to display dual measurements See Table
51. d for signal frequency gt 20 Hz 196 U1253B User s and Service Guide Specifications 7 Table 7 9 Duty cycle and pulse width specifications Function Mode Range Resolution Accuracy at full scale 500 ms 0 01 ms 0 2 3 Pulse width 2000 ms 0 1 ms 0 2 3 Notes for pulse width specifications 1 The accuracy for duty cycle and pulse width is based on a 5 V square wave input into the DC 5 V range 2 Positive or negative pulse width must be greater than 10 us and the range of duty cycle should be considered The range of pulse width is determined by the frequency of the signal Frequency Sensitivity Specifications For voltage measurements Table 7 10 Frequency sensitivity and trigger level specifications for voltage measurements Minimum sensitivity LTS 1 RMS sine wave Trigger level for DC coupling 20 Hz to 200 kHz gt 200 kHz to 500 kHz lt 100 kHz gt 100 kHz to 500 kHz 50 mV 10 mV 25 mV 10 mV 25 mV 500 mV 70 mV 150 mV 70 mV 150 mV 1000 mV 120 mV 300 mV 120 mV 300 mV 5V 0 3 V 1 2 V 0 6 V 1 5 V 50 V 3V 5 V 6 V 15 V 500 V 30 V lt 100 kHz 60 V 1000 V 50 V lt 100 kHz 120 V Notes for frequency sensitivity and trigger level specifications for voltage measurements 1 Maximum input for specified accuracy 10 x range or 1000 V U1253B User s and Service Guide 197 7 Specifications For current measurements Table 7 11 Frequency sensitivity specifications for current measurements Minimum sensitivity RMS
52. data to a PC that is connected to the multimeter via the remote interface when a measurement cycle is completed In this mode the multimeter continuously sends the latest data to the host but does not accept any commands from the host The imi indicator flashes during print operation Press Hz to edit Press amp or W to switch between OFF and ON Press Hz to save and exit or press Esc to exit without saving Figure 4 21 Print mode setup for remote control 112 U1253B User s and Service Guide Changing the Default Settings 4 Revision The revision number of the firmware will be indicated Figure 4 22 Revision number Serial number The last 8 digits of the serial number will be indicated Figure 4 23 Serial number U1253B User s and Service Guide 113 4 114 Changing the Default Settings Voltage alert To enable an alert tone for overvoltage select an overvoltage value within the range of 1 V to 1010 V To disable this function set all digits to 0 OFF iSG7 amp Press Hz SAH to edit Press A or Y Press 4 or gt to go to the digit you want to edit Press Hz to save and exit or press Esc to exit without saving Figure 4 24 Voltage alert setup U1253B User s and Service Guide Changing the Default Settings 4 M initial You may select the initial measurement functions as FACTORY or USER The initi
53. e Full as shown in Figure 3 9 Press Log for gt 1 sec Auto return Figure 3 9 Fu 76 Il log after 3 seconds i U1253B User s and Service Guide Functions and Features 3 Interval logging U1253B User s and Service Guide Firstly ensure that interval time logging is specified in Setup mode 1 Press Cz for more than 1 second to store the present value and function on the primary display into the non volatile memory The f ix and the logging index will be indicated Subsequent readings are automatically logged into the memory at the interval LOG TIME specified in Setup mode Refer to Figure 3 10 on page 78 for how to operate this mode The maximum number of readings that can be stored is 1000 entries When the 1000 entries are all occupied the logging index will indicate Full 2 Press D for more than 1 second to exit this mode When interval time logging is running all keypad operations are disabled except for Log which when pressed for longer than 1 second will exit this mode Furthermore Auto Power Off is disabled during interval logging 71 3 Functions and Features Press Log for gt 1 sec Press Log for gt 1 sec Press Log Stop logging for gt 1 sec Last interval 1 Figure 3 10 Interval time logging mode operation 78 U1253B User s and Service Guide
54. e U1253B User s and Service Guide 51 2 Making Measurements Measuring Capacitance CAUTION 52 Disconnect circuit power and discharge all high voltage capacitors before measuring capacitance to avoid damaging the multimeter or the device under test Use the DC voltage function in order to confirm that a capacitor has fully discharged The U1253B true RMS OLED multimeter calculates capacitance by charging a capacitor with a known current for a period of time measuring the voltage and then calculating the capacitance The larger the capacitor the longer the charge time Below are some tips for measuring capacitance Measuring tips e For measuring capacitance values greater than 10 000 UF discharge the capacitor first then select a suitable range for measurement This will speed up the measurement time and also ensure that the correct capacitance value is obtained e For measuring small capacitance values press with the test leads open to subtract the residual capacitance of the multimeter and leads means that the capacitor is discharging Set up the multimeter as shown in Figure 2 14 Use the red test lead on the positive terminal of the capacitor and the black test lead on the negative terminal and read the display U1253B User s and Service Guide Making Measurements 2 A CAT IV 600 V CAT Ill 1000 V 10A MAX FUSED j FU Red Lead Black Lead Figure 2 14 Capacitance measu
55. e terminals at a glance CAUTION To avoid damaging the multimeter do not exceed the rated input limit CAT IV 600V AN CAT M 1000 A eds LS Figure 1 8 Connector terminals U1253B User s and Service Guide 27 1 Getting Started Table 1 10 Terminal connections for different measurement functions 1000 Vrms 1000 Vrms for short circuit lt 0 3 A A mA 440 mA 1000 V 30 kA as fast acting fuse P 11 A 1000 V 30kA Ooo omaa ooa o oom O AA OFF 440 mA 1000 V E CHG E CHG om fast acting fuse 28 U1253B User s and Service Guide KEYSIGHT TECHNOLOGIES Keysight U1253B True RMS OLED Multimeter User s and Service Guide 2 Making Measurements Understanding The Measurement Instructions 30 Measuring Voltage 30 Measuring AC voltage 31 Measuring DC voltage 32 Measuring AC and DC Signals 34 Measuring Current 35 uA and mA measurement 35 Percentage scale of 4 mA to 20 mA 37 A ampere measurement 39 Frequency Counter 40 Measuring Resistance Conductance and Testing Continuity 42 Testing Diodes 49 Measuring Capacitance 52 Measuring Temperature 54 Alerts and Warning During Measurement 58 Overload alert 58 Input warning 59 Charge terminal alert 60 This chapter contains information on how to make measurements using the U1253B true RMS OLED multimeter 2 Making Measurements Understanding The Measurement Instructions Measuring Voltage CAUTION 30 When making measurements follow the numerical steps labell
56. e than the rated voltage as marked on the multimeter between terminals or between terminal and earth ground e Double check the meters operation by measuring a known voltage e For current measurement turn off circuit power before connecting the multimeter to the circuit Always place the multimeter in series with the circuit e When connecting probes always connect the common test probe first When disconnecting probes always disconnect the live test probe first e Detach test probes from the multimeter before you open the battery cover e Do not use the multimeter with the battery cover or part of the cover removed or loose e Replace the battery as soon as the low battery indicator flashes on screen This is to avoid false readings which may lead to possible electric shock or personal injury Do not operate the product in an explosive atmosphere or in the presence of flammable gases or fumes e Inspect the case for cracks or missing plastic Pay extra attention to the insulation surrounding the connectors Do not use the multimeter if it is damaged e Inspect the test probes for damaged insulation or exposed metal and check for continuity Do not use the test probe if it is damaged e Do not use any other AC charger adapter apart from the one certified by Keysight with this product Do not use repaired fuses or short circuited fuse holders For continued protection against fire replace the line fuses only with fuses of the same
57. econdary display briefly shows PASS If the calibration fails the instrument emits a beep and an error code is shown momentarily on the secondary display For a list of calibration error codes refer to Calibration error codes on page 179 In the event of a calibration failure correct the problem and repeat the procedure Adjustments for each function should be performed with the following considerations where applicable 1 Allow the instrument to warm up and stabilize for 5 minutes before performing the adjustments 2 Ensure that during the adjustment the low battery indicator does not appear Replace recharge the battery as soon as possible to avoid false reading 3 Consider thermal effects as you connect test leads to the calibrator and this instrument It is recommended that you wait for 1 minute after connecting the test leads before you begin the calibration 4 During ambient temperature adjustment ensure that the instrument has been turned on for at least 1 hour with the K type thermocouple connected between the instrument and the calibration source CAUTION Never turn off the instrument during calibration This may delete the calibration memory for the present function U1253B User s and Service Guide 165 6 Performance Tests and Calibration Valid adjustment reference input values Adjustments can be performed using the following reference input values For serial numbers below MY51530001 the 10 kH
58. ed in the diagrams Refer to Table 2 1 below for a description of the steps Table 2 1 Numerical steps descriptions No Instructions D Turn the rotary switch to the measurement option shown in the diagram Connect the test leads into the input terminals shown in the diagram G Probe the test points Read the results on the display The U1253B true RMS OLED multimeter returns an accurate RMS reading not only for sine waves but also other AC signals such as square triangle and staircase waves For AC with DC offset use AC DC measurement by selecting ASV or AS mV with the rotary switch Ensure that terminal connections are correct for that particular measurement before making any measurement To avoid damaging the multimeter do not exceed the rated input limit U1253B User s and Service Guide Making Measurements 2 Measuring AC voltage U1253B User s and Service Guide Set up your multimeter to measure AC voltage as shown in Figure 2 1 Probe the test points and read the display A CAT IV 600 V CAT IlI 1000 V 10 A MAX FUSI Black Lead Figure 2 1 Measuring AC voltage e Press OQ if necessary to ensure is shown on the display e Press to display dual measurements See Table 1 8 of Selecting display with the Dual button on page 22 for a list of dual measurements available e Press and hold for more than 1 second to exit dual display mode 31 2 32 Making Measure
59. ed raea iale once cere reading Is stable and the count setting is exceeded NI Press again to exit this mode saves the displayed value as a ru enters the 1 ms Peak Hold mode reference to be subtracted from subsequent Press Croa D to Ee gah maximum measurements and minimum peak Eaa While in null mode press to view the Press nuy Soni more egret 1 second to exit this mode relative value lt that has been saved The saved relative value will be displayed for 3 seconds Press while the relative value s g 2 is being displayed to cancel the Null function OQO scrolls through the measurement OQO enters the Setup mode function s of the present rotary switch In the Setup mode press or to navigate through selection the menu pages Press A or W to scroll through the available settings Press C to edit the specified value Press Ct again to save the new settings and exit the editing mode or press OQO to exit without saving Press 4 for more than 1 second to exit this mode scrolls through the available enters the Auto Range mode measurement ranges bist when ie rotary switch is at the 4 or 2 position 12 U1253B User s and Service Guide Getting Started 1 Table 1 2 Keypad descriptions and functions continued Button Function when pressed for less than 1 second Function when pressed for more than 1 second scrolls through the available exits Hold Null Dynamic Recording 1 ms Peak dual c
60. ed readings LA mA 1 440 mA 1000 V 6 2 MQ OL A 2 11 A 1000 V 0 06 Q OL 136 U1253B User s and Service Guide Maintenance 5 Fuse replacement This manual provides only the fuse replacement procedures but not the fuse replacement markings Replace any blown fuse in the multimeter according to the following procedures 1 Turn the multimeter off and disconnect the test leads Ensure that the charging adapter is also removed if it is attached to the multimeter Wear clean and dry gloves on your hands and avoid touching any components except the fuse s and plastic parts It is not necessary to recalibrate the multimeter after replacing a fuse Remove the battery cover compartment Loosen two side screws and one lower screw on the bottom case and remove the bottom case Loosen the two screws on the top corners to take out the circuit board Gently remove the defective fuse by prying one end of the fuse loose and removing it from the fuse bracket Replace with a new fuse of the same size and rating Make sure the new fuse is centered in the fuse bracket Ensure that the knob of the rotary switch on the top case and the corresponding switch on the circuit board remain at the OFF position Refasten the circuit board and the bottom cover 10 Refer to Table 5 4 on page 138 for the part number U1253B User s and Service Guide rating and size of the fuses 137 5 Maintenance Table 5 4 Fuse specifications D 2
61. for AC DC current Palle Overload Function Range Resolution i 30Hzto45Hz 45Hzto1kHz 1kHzto 20 kHz protection 500 00 pA P 0 01 pA 1 1425 0 8 25 0 8 25 440 mA 5000 0 pA 0 1 pA 1 1425 0 8 25 0 8 25 10 x 35 mm 50 000 mA 0 001 mA 1 2 25 0 9 25 0 9 25 AC DC 1000 V Current 440 00 mA 0 01 mA 1 2 25 0 9 25 0 9 25 30 kA fast acting 5 0000 A 0 0001 A 1 8 30 4 0 9 30 3 3 70 lt 3A 5kHz 11A 10 000 A 0 001 A 1 8 30 4 0 9 25 3 3 70 lt 3A 5kHz Notes for AC DC current specifications 1 Current can be measured from 2 5 A up to 10 A continuously An additional 0 5 needs to be added to the specified accuracy if the signal being measured is in the range of 10 A to 20 A for 30 seconds maximum After measuring a current of gt 10 A it is recommended that the meter is left to cool down in switched OFF state for twice the length of measurement time used before using it again to make low current measurement These specifications are defined for signal input gt 5 of range Input current gt 35 pArms Input current lt 3 Arms These specifications are for typical performance For 5 A and 10 A ranges the frequency is verified for less than 5 kHz O G A U N U1253B User s and Service Guide 193 7 Specifications Capacitance Specifications Table 7 6 Capacitance specifications Notes for capacitance specifications 1 Overload protection 1000 Vrms for circuits with lt 0 3 A short circuit 2 With film capacitor o
62. g display with the Shift button 20 Selecting display with the Dual button 22 Selecting display with the Hz button 25 Terminal connections for different measurement functions 28 Numerical steps descriptions 30 Percentage scale and measurement range 37 Audible continuity measurement range 46 Available frequencies for square wave output 81 Default factory settings and available setting options for each feature 89 Available settings for M initial 115 Firmware version 2 25 or older 122 Firmware version 2 26 ornewer 122 Battery voltage and corresponding percentage of charg es in standby and charging modes _ 130 Error messages 131 U1253B measurement readings for fuse checking 136 Fuse specifications 138 Basic troubleshooting procedures 140 Recommended test equipment 146 Performance verification tests 152 Valid adjustment reference input values 166 List of calibration items 174 Calibration error codes and their respective meanings 179 DC accuracy of reading number of LSD 186 Accuracy specifications of reading number of LSD for true RMS AC voltage 190 Accuracy specifications of reading number of XXI XXII Table 7 4 Table 7 5 Table 7 6 Table 7 7 Table 7 8 Table 7 9 Table 7 10 Table 7 11 Table 7 12 Table 7 13 Table 7 14 Table 7 15 Table 7 16 Table 7 17 LSD for true RMS AC current 191 Accuracy specifications of reading number of LSD for AC DC voltage 192 Accuracy
63. g the Default Settings 4 Setting the power on melody The melody that is played when the multimeter turns on can be set to FACTORY USER or OFF The USER setting is factory reserved Press Hz to edit Press A or Y to toggle between these options Press Hz to save and exit or press ESC to exit without saving Figure 4 15 Power on melody setup Setting the power on greeting screen The greeting screen that is displayed when the multimeter turns on can be set to FACTORY USER or OFF The USER setting is factory reserved Press Hz T l to edit i Bi Press or Y Press Hz to save and exit to toggle between or press ESC to exit without saving these options Figure 4 16 Power on greeting setup U1253B User s and Service Guide 107 4 Changing the Default Settings Setting baud rate The baud rate used in the remote communication with a PC can be set as 2400 4800 9600 or 19200 bits second Press Hz i to edit gt Press or Y to choose the value gt Ld Press vA or W to choose the value Press A or to choose the value Press Hz to save and exit or press Esc to exit without saving Figure 4 17 Baud rate setup for remote control 108 U1253B User s and Service Guide Changing the Default Settings 4 Setting data bits The number of data bits data width for remote communication with a PC can
64. g the relative function to zero the thermal effect short test leads before measuring the signal The accuracy of 500 Q and 5 kQ is specified after the Null function For the range of 50 M2 500 MO the relative humidity is specified for lt 60 The accuracy is specified for lt 50 nS with the Null function performed on open test leads All frequency counters are susceptible to error when measuring low voltage low frequency signals Shielding inputs from external noise pickup is critical for minimizing measurement errors Use the Null function to offset for residuals 8 The accuracy does not include the tolerance of thermocouple probes The thermal sensor plugged into the multimeter should be placed in the operating environment for at least an hour 9 Always use the relative function to zero the thermal effect with open test leads before measuring the signal If you do not use the relative function add 20 digits to the error 10 10 A continuous and additional 0 5 error to specified accuracy when measuring a signal greater than 10 A to 20 A for 30 seconds maximum After measuring a current of gt 10 A cool down the multimeter for twice the measuring time you applied before performing a low current measurement 11 The current can be measured from 2 5 A to 10 A continuous with an additional 0 5 error to specified accuracy when measuring a signal greater than 10 A to 20 A for 30 seconds maximum After measuring a current of gt 10 A cool d
65. hout saving Figure 4 8 Temperature unit setup 4 100 Changing the Default Settings Setting percentage scale readout This setting converts the DC current measurement display to percentage scale readout 0 to 100 based on a range of 4 mA to 20 mA or 0 mA to 20 mA For example a 25 readout represents a DC current of 8 mA for the 4 mA to 20 mA range or a DC current of 5 mA for the 0 mA to 20 mA range To disable this function set this to OFF Press Hz J L to edit Press A or to configure Press vA or Y to configure Press Hz to save and exit or press Esc to exit without saving Figure 4 9 Setting up percentage scale readout U1253B User s and Service Guide Changing the Default Settings 4 Sound setting for continuity test This setting determines the sound used in the continuity test Select SINGLE for a single frequency beep select OFF for a silent beep or select TONE for a continuous string of beeps with varying frequencies Press Hz to edit Press A or Y i to switch between SINGLE OFF and TONE Press Hz to save and exit or press Esc to exit without saving Figure 4 10 Choosing the sound used in continuity test U1253B User s and Service Guide 101 4 Changing the Default Settings Setting minimum measurable frequency The setup for minimum measurable frequency will influence the measurement rate
66. humidity for temperature up to 35 C decreasing linearly to 50 R H at 55 C Storage temperature 40 C to 70 C with battery removed Altitude Up to 2000 m Pollution degree Pollution Degree 2 The U1253B True RMS OLED Multimeter complies with the following safety and EMC requirements e IEC 61010 1 2001 EN61010 1 2001 2nd Edition Canada CAN CSA C22 2 No 61010 1 04 USA ANSI UL 61010 1 2004 IEC61326 1 2005 EN61326 1 2006 Canada ICES NMB 001 lssue 4 June 2006 Australia New Zealand AS NZS CISPR11 2004 VI U1253B User s and Service Guide Regulatory Markings ICES NMB 001 The CE mark is a registered trademark of the European Community This CE mark shows that the product complies with all the relevant European Legal Directives ICES NMB 001 indicates that this ISM device complies with the Canadian ICES 001 Cet appareil ISM est confomre a la norme NMB 001 du Canada The CSA mark is a registered trademark of the Canadian Standards Association U1253B User s and Service Guide The C tick mark is a registered trademark of the Spectrum Management Agency of Australia This signifies compliance with the Australia EMC Framework regulations under the terms of the Radio Communication Act of 1992 This instrument complies with the WEEE Directive 2002 96 EC marking requirement This affixed product label indicates that you must not discard this electrical electronic product in domestic household waste
67. ical components e Manuals fuses and standard disposable batteries CALIBRATION CYCLE One year 183 7 Specifications Measurement Category The Keysight U1253B True RMS OLED Multimeter has a safety rating of CAT III 1000 V CAT IV 600 V Measurement category definition Measurement CAT are measurements performed on circuits which are not directly connected to the AC mains For example measurements on circuits not derived from the AC mains or specially protected internal mains derived circuits Measurement CAT II are measurements performed on circuits that are directly connected to a low voltage installation For example measurements on household appliances portable tools and other similar equipment Measurement CAT III are measurements performed on building installations For example measurements on distribution boards circuit breakers wiring including cables bus bars junction boxes switches socket outlets within the fixed installation equipment for industrial use and equipment that is permanently connected to the fixed installation such as stationary motors Measurement CATIV are measurements performed at the source of the low voltage installation For example measurements on electricity meters primary over current protection devices and ripple control units 184 U1253B User s and Service Guide Specifications 7 Specification Assumptions e The DC specifications are defined for measurements
68. ide Specifications are only guaranteed within the specified period from the last calibration Keysight recommends that readjustment should be performed during the calibration process for best performance This will ensure that the U1253B true RMS OLED multimeter remains within its specifications This calibration criterion provides the best long term stability During performance verification tests only the performance data is collected these tests do not guarantee that the instrument will remain within the specified limits The tests are only for identifying which functions need adjustment Please refer to the section Calibration count on page 178 and verify that all adjustments have been performed 145 6 Performance Tests and Calibration Recommended Test Equipment The test equipment recommended for the performance verification and adjustment procedures is listed below If the exact instrument is not available substitute with another calibration standard of equivalent accuracy A suggested alternative method would be to use the Keysight 3458A 8 Digit Digital Multimeter to measure less accurate yet stable sources The output value measured from the source can be entered into the instrument as the target calibration value Table 6 1 Recommended test equipment 146 Recommended accuracy Application Recommended equipment requirements DC voltage Fluke 5520A lt 20 of U1253B accuracy spec DC current Fluke 5520A
69. igur Press Hz to save and exit or press Esc to exit without saving Figure 4 29 Refresh rate for primary display readings 119 4 Changing the Default Settings Returning to default factory settings e Set to YES then press for more than 1 second to reset to default factory settings all except the temperature setting e The Reset menu item automatically reverts to menu page 1 after a reset has taken place Figure 4 30 Resetting to default factory settings 120 U1253B User s and Service Guide Changing the Default Settings 4 Setting the battery type The battery type for the multimeter can be set to either 7 2 V or 8 4 V Press Hz 4E to edit Press A or W to switch between 7 2 V and 8 4 V Press Hz to save and exit or press Esc to exit without saving Figure 4 31 Battery type selection U1253B User s and Service Guide 121 4 Changing the Default Settings Setting the Filter This setting is used to filter AC signals in the DC measuring path The DC filter is set to ON by default Table 4 3 Firmware version 2 25 or older Parameter Range Default setting FILtEr on or oFF oFF Table 4 4 Firmware version 2 26 or newer Parameter Range Default setting FILtEr on or oFF oN Press Hz to edit Press A or W to switch between OFF and ON Press Hz to save and exit or press Esc to exit without saving Figure 4 32
70. igure 6 2 Figure 6 3 Figure 6 4 Figure 6 5 Figure 6 6 Figure 6 Refresh rate for primary display readings 119 Resetting to default factory settings 120 Battery type selection 121 Filter 122 9 V rectangular battery 125 Rear panel of the Keysight U1253B True RMS OLED Multimeter 126 Self testing time display 130 Performing self test 131 Charging mode 132 Fully charged and inthe trickle state 133 Battery charging procedures 134 Fuse checking procedures 135 Fuse replacement 138 Displaying all OLED pixels 147 Current terminal error message 148 Charge terminal error message 149 Unsecuring the instrument for calibration 160 Changing the calibration security code 162 Resetting security code to factory default 164 Typical calibration process flow 173 XIX XX THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK U1253B User s and Service Guide List of Tables U1253B User s and Service Guide Table 1 1 Table 1 2 Table 1 3 Table 1 4 Table 1 5 Table 1 6 Table 1 7 Table 1 8 Table 1 9 Table 1 10 Table 2 1 Table 2 2 Table 2 3 Table 3 1 Table 4 1 Table 4 2 Table 4 3 Table 4 4 Table 5 1 Table 5 2 Table 5 3 Table 5 4 Table 5 5 Table 6 1 Table 6 2 Table 6 3 Table 6 4 Table 6 5 Table 7 1 Table 7 2 Table 7 3 Rotary switch description and functions 10 Keypad descriptions and functions 12 General display symbols 14 Primary display symbols 15 Secondary display symbols 17 Analog bar range and counts 19 Selectin
71. ion 1000 V Equipment protected throughout by double insulation or reinforced CAT IV Category IV 600 V overvoltage protection insulation 600 V U1253B User s and Service Guide ll General Safety Information CAUTION IV The following general safety precautions must be observed during all phases of operation service and repair of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Keysight Technologies assumes no liability for the customer s failure to comply with these requirements Turn off the circuit power and discharge all high voltage capacitors in the circuit before you perform resistance and capacitance measurements or continuity and diodes tests Use the correct terminals function and range for your measurements Never measure voltage when current measurement Is selected Use only the recommended rechargeable battery Ensure proper insertion of battery in the multimeter and follow the correct polarity Disconnect test leads from all the terminals during battery charging U1253B User s and Service Guide WARNING Do not exceed any of the measurement limits defined in the specifications to avoid instrument damage and the risk of electric shock e When working above 60 VDC 30 VAC rms or 42 4 VAC peak exercise caution such range poses a shock hazard e Do not measure mor
72. ion follow these steps below or Figure 1 3 on page 7 1 Flip the stand upward and over its maximum reach until it is detached from its hinge 2 Flip the now detached stand over so that its inner surface is facing the multimeter as opposed to facing you 3 Press the stand down into its hinge in an upright position 6 U1253B User s and Service Guide Getting Started 1 Extend the tilt stand until its maximum reach Detach the tilt stand Re attach the tilt stand to anupright position Flip the tilt stand over until this side of the stand is facing the multimeter as opposed to facing you Figure 1 3 Tilt stand at hanging position U1253B User s and Service Guide 7 1 Getting Started The front panel at a glance Te Agilent U1253B True RMS OLED Multineter Bpi Flin Laii l a u fiio e GE EF _ Lo YW alk CAT Iv G0 V AS CAT ii idv ITA MAE PuSEo Fiske Figure 1 4 U1253B front panel Display Keypad Rotary switch Terminal connectors U1253B User s and Service Guide Getting Started The rear panel at a glance U1253B User s and Service Guide IR communication port Test probe holders Tilt stand Battery access cover Figure 1 5 Rear panel 1 1 Getting Started The rotary switch at a glance 10 5 3 8 9 9 1 10 Figure 1 6 Rotary switch Table 1 1 Rotary switch description and functions i res Jescription Function a Ta ocmvacevea
73. ions In the INIT pages you may define your preferred initial measurement functions Please refer to Figure 4 26 Press or to navigate between the two INIT pages Press A or W to choose which initial function you want to change U1253B User s and Service Guide Changing the Default Settings 4 pee s we aE OF ate pO pege peee Press po dorp E pai 4 D rd Press A or W Press A or Y to choose item to choose item Figure 4 26 Navigating between the initial functions pages Then press Cz to enter the EDIT mode In the EDIT mode Press A or W to change the initial default measurement range of a selected function For example Figure 4 27 below shows the initial range of the AC voltage measurement function at the F1 position changed to 1000 V default was Auto Press A or W to change the initial measurement function of a selected rotary switch position For example Figure 4 27 below shows the initial measurement function of the F5 position changed from DIODE to FC frequency counter Edit F1 initial range and F5 initial function Figure 4 27 Editing initial measurement function range As another example Figure 4 28 below illustrates that e The F6 default function is changed from capacitance measurement to temperature measurement U1253B User s and Service Guide 117 4 Changing the Default Settings e The F7 default measurement range for DC UA is
74. is disabled in the Setup mode To activate the multimeter after auto power off simply press any button or change the rotary switch position To disable APO select OFF When APO is disabled the tefat annunciator will be turned off The multimeter will remain on until you manually turn the rotary switch to the OFF position U1253B User s and Service Guide Changing the Default Settings 4 Press Hz ARLE to edit to edit the value ere Set all digits to ZERO to set APO to OFF Press or gt to go to the digit you want to edit srererseeesc AH Py ues sass s i sreraeseeesc SSEGSEEE LoS K pimp jii ot P ERSEES2Sen8 _ Press Hz to save a and exit or press Esc to exit without saving Figure 4 13 Automatic power saving setup U1253B User s and Service Guide 105 4 106 Changing the Default Settings Setting power on backlight brightness level The brightness level that is displayed when the multimeter turns on can be set to HIGH MEDIUM or LOW Press Hz l iN toedit to contigur Press A or Y Press or y to configur Press Hz to save and exit or press Esc to exit without saving Figure 4 14 Power on backlight setup While using the multimeter you may adjust the brightness at any time by pressing the button U1253B User s and Service Guide Changin
75. is not acceptable New security code is acceptable To exit without changing the code press View gt 1 second Error message appears for 3 sec The word PASS appears for 3 seconds Figure 6 5 Changing the calibration security code 162 U1253B User s and Service Guide Performance Tests and Calibration 6 Resetting the security code to factory default U1253B User s and Service Guide If you have forgotten the correct security code you may follow the steps below to change the security code back to the factory default 1234 If you do not have a record or have lost the record or the security code first try the factory default code 1234 through the front panel There is always the possibility that the security code has never been changed at all 1 Record the last 4 digits of the instrument serial number 2 Turn the rotary switch to the y V position 3 Press OQ and Cz simultaneously to enter the Calibration Security Code entry mode 4 The secondary display will indicate CSC I 5555 as a cue for you to enter the security code However since you do not have the security code proceed to the next step 5 Without entering the security code press for more than 1 second to enter Set Default Security Code mode The secondary display will indicate SCD I 5555 6 Press or to start and choose which digit to edit and press or W to edit the value Set these
76. lay symbols are explained below Table 1 4 Primary display symbols Polarity digits and decimal points for primary display U1253B User s and Service Guide 15 1 Getting Started Table 1 4 Primary display symbols continued Decibel unit relative to 1 mW Decibel unit relative to 1 V Frequency units Hz kHz MHz Resistance units Q KQO MQ Conductance unit nS Voltage units mV V Current units uA mA A a ee Fahrenheit temperature unit Duty cycle measurement Percentage scale readout based on DC 0 mA to 20 mA ot ee eee Capacitance units nF uF mF Percentage scale readout based on DC 4 mA to 20 mA 16 U1253B User s and Service Guide Getting Started 1 Table 1 4 Primary display symbols continued Reference impedance for the dBm unit Scale of bar graph The secondary display annunciators are described below Table 1 5 Secondary display symbols Ee a Decibel unit relative to 1 mW Decibel unit relative to 1 V Frequency units Hz kHz MHz Resistance units Q KQO MQ Current units uA mA A Pim ie tie Capacitance units nF uF mF U1253B User s and Service Guide 17 1 Getting Started Table 1 5 Secondary display symbols continued Celsius ambient temperature unit POR Fahrenheit ambient temperature unit PTE Pai No ambient temperature compensation just thermocouple measurement Pulse width unit Leak display TLEEELE SS Elapsed time unit s second for Dynamic Rec
77. le options C F Dual display C in primary display F in secondary C Single display in C only F C Dual display F in primary display C in secondary F Single display in F only Press to swap between C and F mA SCALE 4mAto20mA_ Percentage scale for mA e Available options 4 20 mA 0 20 mA or OFF e Select OFF to disable this function for normal operation CONTINUITY SINGLE Audible continuity e Available options SINGLE OFF or TONE MIN Hz 0 5 Hz Minimum measurement frequency Available options 0 5 Hz 1 Hz 2 Hz or 5 Hz BEEP 2400 Beep frequency e Available options 4800 Hz 2400 Hz 1200 Hz 600 Hz or OFF e To disable this function select OFF Automatic power off e To enable this function select a value within the range of 1 minute to 99 minutes e To disable this function set all digits to zero OFF will be indicated Default power on backlight brightness level Available options HIGH a or LOW FACTORY Power on melody Available options FACTORY USER or OFF GREETING FACTORY Power on greeting Available options FACTORY USER or OFF 90 U1253B User s and Service Guide Changing the Default Settings 4 Table 4 1 Default factory settings and available setting options for each feature Default factory setting Available setting options BAUD 9600 Baud rate for remote communication with a PC remote control Available options 2400 4800 9600 and 19200
78. list 3 Provide the instrument model number and serial number U1253B User s and Service Guide 141 5 Maintenance THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 142 U1253B User s and Service Guide KEYSIGHT TECHNOLOGIES Keysight U1253B True RMS OLED Multimeter User s and Service Guide 6 Performance Tests and Calibration Calibration Overview 144 Closed case electronic calibration 144 Keysight Technologies calibration services 144 Calibration interval 145 Other recommendations for calibration 145 Recommended Test Equipment 146 Basic Operating Tests 147 Testing the display 147 Current terminals test 148 Charge terminals alerttest 149 Test Considerations 150 Performance Verification Tests 151 Calibration Security 158 Unsecuring the instrument for calibration 158 Changing Calibration Security Code 161 Resetting the security code to factory default 163 Adjustment Considerations 165 Valid adjustment reference input values 166 Calibration From Front Panel 1 0 Calibration process 1 0 Calibration procedures 1 1 Calibration count 1 8 Calibration errorcodes 1 9 This chapter contains the performance test and adjustment procedures 6 Performance Tests and Calibration Calibration Overview This manual contains procedures for verifying the instrument performance as well as procedures for making adjustments where necessary The performance test procedure verifies that the U1253B true RMS OLED multimeter is operating withi
79. me I AC von voltage AL V Default is DC voltage A V Press O to select AC voltage V Press QO twice to select AC DC voltage AT mV Default is DC voltage AT mV Press OQO to select AC voltage 22 AC DC V Hz AC coupling dBm or dBV L AC DC V U1253B User s and Service Guide Getting Started 1 Table 1 8 Selecting display with the Dual button continued Rotary switch position Function Primary display Secondary display AT mV Press OQO twice to select AC DC voltage UA Ny Default is DC current UA Ny Press OQO to select AC current UA Ny Press OQO twice to select AC DC current mA AZ Default is DC current mA AZ Press OQO to select AC current nA A Press CD twice to select AC DC current nA A Default is DC current U1253B User s and Service Guide AC DC mV Hz AC coupling dBm or dBV AC DC mV DC uA Hz DC coupling DC uA AC uA AC uA Hz AC coupling AC DC mA Hz AC coupling 23 1 Getting Started Table 1 8 Selecting display with the Dual button continued Rotary switch position Function Primary display Secondary display AC DC A Hz AC couplin mAAR Oo aa O z AC coupling Press lt P twice to select AC DC Acc F Capacitance p Diode aE V nS No secondary display Ambient temperature in nS Conductance C or F is displayed in upper right corner DC mV Bias DC A Leak Resistance Ambient
80. ments Measuring DC voltage Set up your multimeter to measure DC voltage as shown in Figure 2 2 Probe the test points and read the display Press OQ if necessary to ensure that 2777 is shown on the display Press to display dual measurements See Table 1 8 of Selecting display with the Dual button on page 22 for a list of dual measurements available Press and hold for more than 1 second to exit dual display mode For firmware version 2 25 and below the Filter function is switched off by default You are strongly advised to update your products to the latest firmware version to take advantage of the latest features and measurement improvements For measuring DC voltage from a mixed signal in the DC measurement mode ensure that the Filter is enabled refer to Setting the Filter on page 122 To avoid possible electric shock or personal injury enable the Low Pass Filter to verify the presence of hazardous DC voltages Displayed DC voltage values can be influenced by high frequency AC components and must be filtered to assure an accurate reading U1253B User s and Service Guide Making Measurements 2 Figure 2 2 Measuring DC voltage U1253B User s and Service Guide 33 2 Making Measurements Measuring AC and DC Signals Your multimeter is capable of displaying both AC and DC signal components voltage or current as two separate readings or one AC DC rms value combined 1 Set up your multimeter ac
81. mode operation 78 Log review mode operation 80 Frequency adjustment for square wave output 82 Duty cycle adjustment for square wave output 83 Pulse width adjustment for square wave output 84 Cable connection for remote communication 85 Setup menu screens 92 Data Hold Refresh Hold setup 93 Data logging setup 94 Log time setup for interval time logging 95 Decibel measurement setup 96 Setting up the reference impedance for dBm unit 97 Thermocouple type setup 98 Temperature unit setup 99 Setting up percentage scale readout 100 Choosing the sound used in continuity test 101 Minimum frequency setup 102 Beep frequency setup 103 Automatic power saving setup 105 Power on backlight setup 106 Power on melody setup 107 Power on greeting setup 107 Baud rate setup for remote control 108 Data bits setup for remote control 109 Parity check setup for remote control 110 Echo mode setup for remote control 111 Print mode setup for remote control 112 Revisionnumber 113 Serialnumber 113 Voltage alertsetup 114 Setting initial measurement functions 116 Navigating between the initial functions pages 117 Editing initial measurement function range 117 Editing initial measurement function range and initial output values 118 U1253B User s and Service Guide U1253B User s and Service Guide Figure 4 29 Figure 4 30 Figure 4 31 Figure 4 32 Figure 5 1 Figure 5 2 Figure 5 3 Figure 5 4 Figure 5 5 Figure 5 6 Figure 5 Figure 5 8 Figure 5 9 Figure 6 1 F
82. mperature Frequency Duty cycle Pulse width Specifications Times second 7 7 4 lt 100 uF 7 7 2 6 1 gt 10 Hz 0 5 gt 10 Hz 0 5 gt 10 Hz The U1253B handheld digital multimeter does not contain a realtime clock Only ONE sample per second can be logged U1253B User s and Service Guide 201 7 7 Specifications Input impedance Table 7 17 Input impedance 202 Function Range Input Impedance 50 000 mV 10 00 MQ 500 00 mV 10 00 MQ 1000 0 mV 10 00 MQ DC Voltage S 5 0000 V 11 10 MQ 50 000 V 10 10 MQ 500 00 V 10 01 MQ 1000 0 V 10 001 MQ 50 000 mV 10 00 MQ 500 00 mV 10 00 MQ 1000 0 mV 10 00 MQ AC Voltage 5 0000 V 10 00 MQ 50 000 V 10 00 MQ 500 00 V 10 00 MQ 1000 0 V 10 00 MQ U1253B User s and Service Guide Table 7 17 Input impedance continued Specifications 7 Function Range 50 000 mV 500 00 mV 1000 0 mV AC DC Voltage 5 0000 V 50 000 V 500 00 V 1000 0 V Notes for input impedance Input Impedance 10 00 MQ 10 00 MQ 10 00 MQ 11 10 MQ 7 10 MQ 10 10 MQ 10 MQ 10 01 MQ 10MQ 10 001 MQ 10MQ 1 For5 V to 1000 V range the specified input impedance in parallel with 10 MQ at dual display 2 The specified input impedance nominal in parallel with lt 100 pF 3 Forb V to 1000 V range the specified input impedance is in parallel with 10 MQ when the input voltage is gt 3 V or lt 2 V U1253B User s and Service Guide 203 7 Specificatio
83. n be stepped through 256 steps with each step equivalent to 1 256 x frequency The displayed pulse width will be automatically adjusted to 5 digits ranging from 9 9999 to 9999 9 ms Press A Press W Figure 3 14 Pulse width adjustment for square wave output 84 U1253B User s and Service Guide Functions and Features 3 Remote Communication This multimeter has a bidirectional full duplex communication capability that enables data transfer from the multimeter to a PC The required accessory for this is an optional IR USB cable to be used with an application software that is downloadable from the Keysight Web site For details on performing PC to meter remote communication click on Help after launching the Keysight GUI Data Logger Software or refer to the GUI Data Logger Quick Start Guide U1251 90003 for more information Connect to PC Figure 3 15 Cable connection for remote communication U1253B User s and Service Guide 85 3 Functions and Features THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 86 U1253B User s and Service Guide Keysight U1253B True RMS OLED Multimeter User s and Service Guide 4 Changing the Default Settings Selecting Setup Mode 88 Default Factory Settings and Available Setting Options 89 Setting Data Hold Refresh Hold mode 93 Setting datalogging mode 94 Setting dB measurement 96 Setting reference impedance for dBm measurement 97 Setting thermoco
84. n its published specifications The adjustment procedure ensure that the multimeter remains within its specifications until the next calibration Make sure you have read Test Considerations on page 150 before calibrating the instrument Closed case electronic calibration The U1253B true RMS OLED multimeter features closed case electronic calibration In other words no internal electro mechanical adjustment is required This instrument calculates correction factors based on the input reference signals you feed into it during the calibration process The new correction factors are stored in nonvolatile EEPROM memory until the next calibration adjustment is performed The contents of this nonvolatile EEPROM memory will not change even when the power is switched off Keysight Technologies calibration services When your instrument is due for calibration contact your local Keysight Service Center to enquire about recalibration services 144 U1253B User s and Service Guide Performance Tests and Calibration 6 Calibration interval A one year interval is adequate for most applications Accuracy specifications are warranted only if calibration is performed at regular intervals Accuracy specifications are not warranted beyond the one year calibration interval Keysight does not recommend extending calibration intervals beyond 2 years for any application Other recommendations for calibration U1253B User s and Service Gu
85. ne sounds to remind you to charge the battery Press to start charging the battery or the multimeter will automatically start charging after 10 seconds It is recommended not to charge the battery if the battery capacity is over 90 U1253B User s and Service Guide 129 5 Maintenance Figure 5 3 Self testing time display Table 5 1 Battery voltage and corresponding percentage of charges in standby and charging modes Condition Battery voltage Proportional percentage Charging 7 2 V to 10 0 V 0 to 100 6 After pressing OQ or in the case of a restart the multimeter will perform a self test to check whether the battery inside the multimeter is a rechargeable battery This self test will take 3 minutes Avoid pressing any of the push buttons during the self test If there is any error the multimeter will display error messages as shown in Table 5 2 on page 131 130 U1253B User s and Service Guide Maintenance 5 Figure 5 4 Performing self test Table 5 2 Error messages Error OVER LIMIT 1 No battery inside 2 Faulty battery 3 Battery is fully charged CHARGE ERROR 1 If charging battery more than 12 V or less than 5 V 2 In3 minutes if the battery voltage does not go upwards then charge error U1253B User s and Service Guide Error message 131 5 132 Maintenance If the OVER LIMIT message is displayed and there is a battery inside the multimeter please do not charge the battery lf the C
86. ns THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 204 U1253B User s and Service Guide www keysight com Contact us To obtain service warranty or technical assistance contact us at the following phone or fax numbers United States tel 800 829 4444 fax 800 829 4433 Canada tel 8778944414 fax 800 746 4866 China tel 8008100189 fax 800 820 2816 Europe tel 31 20 547 2111 Japan tel 81 426 56 7832 fax 81 426 56 7840 Korea tel 080 769 0800 fax 080 769 0900 Latin America tel 305 269 7500 Taiwan tel 0800 047 866 fax 0800 286 331 Other Asia Pacific Countries tel 65 6375 8100 fax 65 6755 0042 Or visit the Keysight World Wide Web at www keysight com tind assist Product specifications and descriptions in this document are subject to change without notice Always refer to the English version on the Keysight Web site for the latest revision www keysight com This information is subject to change without notice Keysight Technologies 2009 2015 Edition 13 July 10 2015 KEYSIGHT 1253 90035 TECHNOLOGIES www keysight com
87. ombination displays except when the Hold and dual display modes rotary switch is at the 4 HZ or GUA position or when the multimeter is in 1 ms Peak Hold or Dynamic Recording mode I Ce enters the Frequency Test mode for e f data logging is set as i 4 4 3 manual data logging current or voltage measurements pressing for more than 1 second will log the Press Ce to scroll through frequency Hz present reading into the memory The display will return pulse width ms and duty cycle to normal after 3 seconds To manually log another functions reading press again for more than 1 second In duty cycle and pulse width ms tests If data logging is set as f ffi automatic data press to switch between positive and logging pressing C for more than 1 second will negative edge trigger enter the automatic data logging mode and data Is When the rotary switch is at the 4 position logged at the interval defined in Setup mode tt and the Frequency Counter function is Press Ce for more than 1 second to exit data logging selected pressing Ce will cycle through mode the frequency pulse width and duty cycle measurements Notes for keypad descriptions and functions 1 2 See Table 4 1 on page 89 for details of available options When the rotary switch is at and the temperature measurement function is selected pressing will not affect any setting When the rotary switch is at 3 and the frequency co
88. on 25 The terminals ata glance 27 Making Measurements Understanding The Measurement Instructions 30 Measuring Voltage 30 Measuring AC voltage 31 Measuring DC voltage 32 Measuring AC and DC Signals 34 Measuring Current 35 uA and mA measurement 35 Percentage scale of 4 mA to 20mA 37 A ampere measurement 39 Frequency Counter 40 Measuring Resistance Conductance and Testing Continuity 42 Xl XII Testing Diodes 49 Measuring Capacitance 52 Measuring Temperature 54 Alerts and Warning During Measurement 58 Overload alert 58 Input warning 59 Charge terminal alert 60 Functions and Features Dynamic Recording 62 Data Hold Trigger Hold 64 Refresh Hold 66 Null Relative 68 Decibel Display 70 1ms Peak Hold 73 Data Logging 7b Manual logging 75 Interval logging 77 Reviewing logged data 79 Square Wave Output 81 Remote Communication 85 Changing the Default Settings Selecting Setup Mode 88 Default Factory Settings and Available Setting Options 89 Setting Data Hold Refresh Hold mode 93 Setting data logging mode 94 Setting dB measurement 96 U1253B User s and Service Guide Setting reference impedance for dBm measurement 97 Setting thermocouple types 98 Setting temperature unit 98 Setting percentage scale readout 100 Sound setting for continuity test 101 Setting minimum measurable frequency 102 Setting beep frequency 103 Setting Auto Power Off mode 104 Setting power on backlight brightness level 106
89. ording and 1 ms Peak Hold modes Pm Hazardous voltage annunciator for measuring voltage gt 30 V or Overload The analog bar emulates the needle on an analog multimeter without displaying the overshoot When measuring peak or null adjustments and viewing fast changing inputs the bar graph is useful because it provides a faster update rate to cater for fast response applications For frequency duty cycle pulse width 4 mA to 20 mA scale O0 mA to 20 mA scale dBm dBV and temperature measurements the bar graph does not represent the primary display value e For example when frequency duty cycle or pulse width is displayed on the primary display during voltage or current measurement the bar graph represents the voltage or current value not the frequency duty cycle or pulse width scale C i graph represents the current value and not the percentage value 18 U1253B User s and Service Guide Getting Started 1 The or sign indicates whether the measured or calculated value is positive or negative Each segment represents 2000 or 400 counts depending on the range indicated on the peak bar graph See the following table Table 1 6 Analog bar range and counts 2000 V A Q nS Diode V A Capacitance U1253B User s and Service Guide 19 1 Getting Started Selecting display with the Shift button The table below shows the primary display selection with respect to measurement function r
90. otary switch position using the Shift button Table 1 7 Selecting display with the Shift button Rotary switch position Function Primary display AC voltage dBm or dBV in dual display mode l 21 V Acre res AC DC V DC volta ee ee AC DC voltage ALMY AC DC mV nS ee ee i e Resistance Q Audible Hz gt wi Capacitance amp Temperature Temperature DC uA o AC DC current aa AC DC uA 20 U1253B User s and Service Guide Getting Started 1 Table 1 7 Selecting display with the Shift button continued Rotary switch position Function Primary display pp AC DC current With the positive probe inserted into the uA mA AC DC mA terminal 0 mA to 20 mA or 4 mA to 20 mA Reading in mA or A is shown as secondary display es With the positive probe inserted into the A terminal AC DC A Duty cycle Pulse width ms Notes for selecting display with SHIFT button 1 Depends on the relevant setting in the Setup mode 2 Press for more than 1 second to return to AC V measurement only U1253B User s and Service Guide 21 1 Getting Started Selecting display with the Dual button e Press D to select different combinations of the dual display e Press and hold for more than 1 second to return to normal single display e See the following table Table 1 8 Selecting display with the Dual button Rotary switch position Function Primary display Secondary display
91. own the multimeter for twice the measuring time you applied before performing a low current measurement 12 For signal frequencies greater than 1 kHz an additional 0 1 error per kHz needs to be added to the accuracy 13 Ensure that the ambient temperature is stable within 1 C Make sure the multimeter is placed in a controlled environment for at least 1 hour Keep the multimeter away from any ventilation exit 14 Do not touch the thermocouple test lead after connecting it to the calibrator Allow the connection to stabilize for at least another 15 minutes before performing the measurement o1 GW U1253B User s and Service Guide 157 6 Performance Tests and Calibration Calibration Security A calibration security code is in place to prevent accidental or unauthorized adjustments to the U1253B true RMS OLED multimeter When you first receive your instrument it is secured Before you can adjust the instrument you must unsecure it by entering the correct security code see the section Unsecuring the instrument for calibration on page 158 The security code is set as 1234 when the instrument is shipped from the factory The security code is stored in nonvolatile memory which does not change even when the power is off You can unsecure the instrument and then change the security code from the front panel See the section Resetting the security code to factory default on page 163 if you forget yo
92. peration U1253B User s and Service Guide 71 3 Functions and Features Press Dual for gt 1 sec Press Press Dual Dual Figure 3 6 dBV display mode operation 72 U1253B User s and Service Guide Functions and Features 3 1 ms Peak Hold The Peak Hold function allows the measurement of peak voltage for analysis of components such as power distribution transformers and power factor correction capacitors The peak voltage obtained can be used to determine the crest factor Peak value Crest factor True RMS value 3 1 Press for more than 1 second to toggle 1 ms Peak Hold mode ON and OFF 2 Press Ctra to switch between maximum and minimum peak readings p iiiisiti Indicates maximum peak while biei r e Indicates minimum peak e Ifthe reading is OL press to change the measurement range and to restart peak recording measurement e Ifyou need to restart peak recording without changing the range press Cx 3 Press and hold or for more than 1 second to exit this mode 4 In the measurement example shown in Figure 3 7 on page 74 the crest factor will be 2 2669 1 6032 1 414 U1253B User s and Service Guide 73 3 Functions and Features Press Peak for gt 1 sec Press Max Min Start to capture Press Dual to reset Start to capture Press Max Min Bii har irnia Note pressing
93. puter Software or Com puter Software Documentation Safety Notices CAUTION A CAUTION notice denotes a haz ard It calls attention to an operat ing procedure practice or the like that if not correctly performed or adhered to could result in damage to the product or loss of important data Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met A WARNING notice denotes a hazard It calls attention to an operating procedure practice or the like that if not correctly per formed or adhered to could result in personal injury or death Do not proceed beyond a WARNING notice until the indicated condi tions are fully understood and met U1253B User s and Service Guide Safety Symbols The following symbols on the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument Direct current DC Off supply On supply Alternating current AC Caution risk of electric shock Both direct and alternating current Caution risk of danger refer to this manual Three phase alternating current c S for specific Warning or Caution information Earth ground terminal Caution hot surface Out position of a bi stable push control Protective conductor terminal Frame or chassis terminal In position of a bi stable push control i a AT Ill Equipotentiality C Category III 1000 V overvoltage protect
94. r better use Null function to zero out residual 194 Range 10 000 nF 100 00 nF 1000 0 nF 10 000 uF 100 00 uF 1000 0 uF 10 000 mF 100 00 mF Resolution 0 001 nF 0 01 nF 0 1 nF 0 001 uF 0 01 uF 0 1 uF 0 001 mF 0 01 mF Accuracy 1 8 1 5 3 10 Display update rate approx 4 times second 1 time second 0 1 time second 0 01 time second U1253B User s and Service Guide Specifications 7 Temperature Specifications Table 7 7 Temperature specifications Thermocouple Type Range Resolution Accuracy 1 200 C to 40 C 0 1 C 1 3 C 328 F to 40 F 0 1 F 1 5 4 F i 40 C to 1372 C 0 1 C 1 1 C 40 F to 2502 F 0 1 F 1 1 8 F 210 C to 40 C 0 1 C 1 3 C 346 F to 40 F 0 1 F 1 5 4 F i 40 C to 1372 C 0 1 C 1 1 C 40 F to 2502 F 0 1 F 1 1 8 F Notes for temperature specifications 1 The accuracy is specified according to the following conditions The accuracy does not include the tolerance of the thermocouple probe The thermal sensor plugged into the meter should be placed in the operating environment for at least an hour prior to measurement Use the Null function to reduce the thermal effect Before using Null function set the meter to no ambient with any surface that has a different temperature from the ambient temperature When measuring temperature with respect to any temperature calibrator try to
95. rements U1253B User s and Service Guide 2 Making Measurements Measuring Temperature 54 CAUTION Do not bend the thermocouple leads at sharp angles Repeated bending over a period of time can result in the leads breaking The bead type thermocouple probe is suitable for measuring temperatures from 20 C to 200 C in PTFE compatible environments Do not use the thermocouple probe beyond the recommended operating range Do not immerse this thermocouple probe in any liquid Use a thermocouple probe designed for each specific application an immersion probe for liquid or gel and an air probe for air measurement Set up the multimeter to measure temperature as shown in Figure 2 17 or observe the following steps 1 Press OQ to select temperature measurement 2 Connect the miniture thermal probe into the non compensation transfer adapter as shown in Figure 2 15 Then connect the thermal probe with the adapter into the meter input terminals as shown in Figure 2 16 3 For best performance place the meter in the operating environment for at least one hour to stabilize the unit to environment temperatures 4 Clean the surface to be measured and ensure that the probe is securely touching the surface Remember to disable the applied power 5 When measuring above ambient temperatures move the thermocouple along the surface until you get the highest temperature reading 6 When measuring below ambient temperatures mo
96. ress A tH a t i 4 Meru i P Press gt i Press PRE rE Peev LERE 2K mA SCALE SThere O P NTINOTTY gt SINGLE MIN Hz gt 0 5Hz MIH Hz gt 0 5Hz mw 4 Menu P Press A yg Menu e Press gt Press lt j BEEF 2400Hz Press V KES 2400HZ BEEETING gt FACTORY GREETING gt FACTORY 4 meng p PPM ao 4 Menu P Press gt 7 Press 4d BAUD gt 9600 Press W BAUD _ gt 9600 PRINT gt DFF FRIT gt DFF H q Menu d P Press A ee 4 fiery d F Press gt Jj Press d REVISION gt 02 19 Press W FEVISION 02 135 al d 5 i i scl wt 1 305 Fi A ial ERT Y gt OF bre aoe ERT peda er H IHITIAL gt FACTORY 4 n IHITIAL gt FACTORY SHOgTH gt NORMAL SHogTH gt HORMAL Press i of er OU Press gt T Press WDEFAULT gt NO Figure 4 1 Setup menu screens 92 U1253B User s and Service Guide Changing the Default Settings 4 Setting Data Hold Refresh Hold mode 1 Set menu item RHOLD to OFF to enable Data Hold mode manual trigger by key or bus via remote control 2 Set menu item RHOLD within the range of 100 to 9900 to enable Refresh Hold mode automatic trigger Once the variation of measured values exceeds this value which is the variation count the Refresh Hold will be ready to trigger and hold a new value HRHOLT gt psp RHOLD 050g PLOG ug HAHD Press Hz PLOG ug Hane OG TIME 00015 to edit OG TIME 00015 o igh Cs
97. roperly Turn the rotary switch to any non off position other than mA A gt _ Insert the tests leads to the A and COM terminals An error message ErrorON AINPUT as shown in Figure 6 2 will be displayed on the secondary display and a continuous beep will persist until the positive lead is removed from the A terminal Before conducting this test make sure the beep function is not disabled in Setup Figure 6 2 Current terminal error message 148 U1253B User s and Service Guide Performance Tests and Calibration 6 Charge terminals alert test This test determines whether the charge terminal alert is functioning properly OFF Set the rotary switch to any position other than CHG ULL 9 mA AZS PAX OF Gute Provide a voltage level more than 5 V to the CHG terminal An error message Error ON mA INPUT as shown in Figure 6 3 will be displayed on the secondary display and a continuous beep will persist until the positive lead is removed from the EH CHG terminal Figure 6 3 Charge terminal error message Before conducting this test make sure the beep function is not disabled in Setup U1253B User s and Service Guide 149 6 Performance Tests and Calibration Test Considerations Long test leads can act as antennas that pick up AC signal noises For optimum performance all procedures should comply with the following recommendations e Ensure that the ambient temperature is stable and between 18
98. rrent of gt 10 A it is recommended that the meter is left to cool down in switched OFF state for twice the length of measurement time used before using it again to make low current measurement 9 Always use the Null function to zero out thermal effect with open test leads before measuring the signal If Null function is not used an additional 20 counts needs to be added to the specified accuracy Thermal effect could occur due to the following Wrong operation where the resistance diode or mV measurement function is used to measure high voltage signals within the range of 50 V to 1000 V After battery charging is complete After measuring a current greater than 500 mA it is recommended that the meter is left to cool down for twice the length of measurement time used 188 U1253B User s and Service Guide Specifications Table 7 1 DC accuracy of reading number of LSD continued Function Range Resolution Test Current or Burden Accuracy Voltage Continuity l 0 500 00 Q 0 01 Q 1 04 mA 0 05 10 Notes for continuity specifications 10 Instant continuity built in beeper will sound when resistance is less than 10 0 Q Diode 02M3 3 0000 V 0 1 mV 1 04 mA 0 05 5 Notes for diode specifications 11 Built in beeper will sound when the reading is below approximately 50 mV Also single tone beeping for normal forward biased diode or semiconductor junction with bias voltage between 0 3 V and 0 8 V 12 These specification
99. s lt 30 V pp The minimum measurement frequency of low frequency is set by power on option to speed up the measurement rate 4 Shown on the secondary display oo U1253B User s and Service Guide 199 7 Specifications Square Wave Output Table 7 15 Square wave output specifications Output 1 Range Accuracy 0 5 1 2 5 6 10 15 20 25 30 40 50 60 75 80 100 120 150 200 240 300 0 Frequency 400 480 600 800 1200 1600 2400 0 005 x output frequency 2 counts 4800 Hz Duty cycle 2A 0 39 to 99 60 0 398 of full scale Pulse width 21I 1 1 Frequency 0 2 ms range 256 Amplitude Fixed 0 to 2 8 V 0 2V Notes for square wave output specifications 1 Output impedance 3 5 kQ2 maximum 2 The positive or negative pulse width must be greater than 50 us for adjusting the duty cycle or pulse width under different frequencies Otherwise the accuracy and range will differ from the definition 3 For signal frequency greater than 1 kHz an additional 0 1 per kHz is added to the accuracy 4 The accuracy for duty cycle and pulse width is based on a 5 V square wave input without dividing signal 200 U1253B User s and Service Guide Operating Specifications Display update rate approximate Table 7 16 Display update rate approximate Function AC V AC V dB DC V V or mV AC V V or mV AC DC V V or mV Q ns Diode Capacitance DC A pA mA or A AC A pA mA or A AC DC A pA mA or A Te
100. s CD for more than 1 second to exit Setup mode U1253B User s and Service Guide Changing the Default Settings 4 Default Factory Settings and Available Setting Options The following table shows the various menu items with their respective default settings and available options Table 4 1 Default factory settings and available setting options for each feature Default factory setting Available setting options RHOLD 500 Refresh hold e To enable this function select a value within the range of 100 to 9900 e To disable this function set all digits to zero OFF will be indicated Note Select OFF to enable data hold manual trigger 1 D LOG HAND Available options for data logging e HAND manual data logging e TIME interval automatic data logging where the interval is according to the LOG TIME setting LOG TIME 0001 S Logging interval for interval time data logging Select a value within the range of 0001 second to 9999 seconds e Available options dBm dBV or OFF e Select OFF to disable this function for normal operation dBm R 50 Q Reference impedance value for dBm measurement Select a value within the range of 1 Q to 9999 Q U1253B User s and Service Guide 89 4 Changing the Default Settings Table 4 1 Default factory settings and available setting options for each feature Default factory setting Available setting options oe type Available options K type or J type Rall UNIT ae unit e Availab
101. s are defined for voltages measured at the input terminals only The test current is typical Variation in the current source will create some variation in voltage drop across a diode junction 13 Maximum open voltage lt 4 2 V 7 U1253B User s and Service Guide 189 7 Specifications AC Specifications Table 7 2 Accuracy specifications of reading number of LSD for true RMS AC voltage Function Range 5 50 000 mV 500 00 mV 1000 0 mV Voltage 5 0000 V 50 000 V 500 00 V 1000 0 V Resolution 0 001 mV 0 01 mV 0 1 mV 0 0001 V 0 001 V 0 01 V 0 1 V Notes for AC voltage specifications 1 Input impedance Refer to Table 7 17 2 These specifications are defined for signal input gt 5 of range 3 Crest factor lt 3 0 at full scale 5 0 at half scale except the 1000 mV and 1000 V ranges where it is 1 5 at full scale 3 0 at half scale For non sinusoidal waveform add 0 1 of reading 0 3 of range 4 Additional error to be added for frequency gt 15 kHz and signal input lt 10 of range 3 counts of LSD per kHz 20 Hz to 45 Hz 1 5 20 1 5 60 1 5 60 1 5 60 1 5 60 1 5 60 1 5 60 5 2 over range on all ranges except AC 1000 V range 190 45 Hz to 1 kHz 0 4 40 0 4 25 0 4 25 0 4 25 0 4 25 0 4 25 0 4 40 Accuracy PIB 1 kHz to 5 kHz 0 7 40 0 4 25 0 4 25 0 6 25 0 4 25 0 4 25 0 4 40 5 kHz to 15 kHz 0 75 40 0 75 40 0 75 40 1 5 40 1 5
102. s for frequency duty cycle and pulse width The typical measurement rate as defined in the specification is based on a minimum measurable frequency of 1 Hz Press Hz to edit y to choose the value to choose the value Press or to choose the value Press Hz to save ware and exit or press Esc to exit without saving Figure 4 11 Minimum frequency setup 102 U1253B User s and Service Guide Changing the Default Settings 4 Setting beep frequency The beep frequency can be set to 4800 Hz 2400 Hz 1200 Hz or 600 Hz OFF disables the beep Press Hz g to edit Press or Y to choose the value y A i Piir i Piei i f Press A or Y to choose the value Press A or Y to choose the value ji Press A or Y w to choose the value Press Hz to save and exit or press Esc HEN to exit without saving Figure 4 12 Beep frequency setup U1253B User s and Service Guide 103 4 104 Changing the Default Settings Setting Auto Power Off mode e To enable Auto Power Off APO set the timer to any value within the range of 1 to 99 minutes The multimeter may turn off automatically with APO enabled if neither of the following happens within that time period Any push button is pressed A measurement function is changed Dynamic recording is set 1 ms peak hold is set APO
103. scharge all high voltage capacitors before testing diodes to avoid damaging the multimeter To test a diode turn the power off to the circuit and remove the diode from the circuit Set up the multimeter as shown in Figure 2 12 then use the red probe lead on the positive terminal anode and use the black probe lead on the negative terminal cathode and read the display e The cathode of a diode is indicated with a band e This multimeter can display diode forward bias of up to approximately 3 1 V The forward bias of a typical diode is within the range of 0 3 V to 0 8 V Next reverse the probes and measure the voltage across the diode again refer to Figure 2 13 on page 51 The diode s test result is based on the following e A diode is considered good if the multimeter displays OL in reverse bias mode e A diode is considered shorted if the multimeter displays approximately 0 V in both forward and reverse bias modes and the multimeter beeps continuously e A diode is considered open if the multimeter displays OL in both forward and reverse bias modes 49 2 50 Making Measurements A CAT IV 600 V CAT III 1000 V A Red Lead Black Lead Figure 2 12 Measuring the forward bias of a diode U1253B User s and Service Guide Making Measurements 2 A CAT IV 600 V CAT Ill 1000 V AN 10A MAX i FUSED Black Lead Figure 2 13 Measuring the reverse bias of a diod
104. sent calibration item after showing the error code for 3 seconds In this case you need to check whether the correct reference input has been applied Refer to Table 6 5 on page 179 for the meaning of the error codes Repeat step 4 and step 5 until all calibration items for that particular function have been completed Select another function to be calibrated Repeat step 4 to step 7 e For a rotary switch position that hosts more than one function for example a press OQ to go to the next function After calibrating all the functions press OQ and D simultaneously to exit calibration mode Switch off the instrument and then switch it on again The instrument will be back to normal measurement mode Refer to Figure 6 7 on page 173 U1253B User s and Service Guide Performance Tests and Calibration 6 Press Wr or to select calibration item if not performing complete calibration Error message appears for 3 seconds Set up calibrator according to indicated reference value Press Save when ready to start calibration Reading agi Out of acceptable range Reading is within acceptable range The word PASS appears for 3 seconds then proceeds to the next calibration item Figure 6 7 Typical calibration process flow U1253B User s and Service Guide 173 6 Performance Tests and Calibration Table 6 4 List of calibration items ACV 0 300
105. specifications of reading number of LSD for AC DC current 193 Capacitance specifications 194 Temperature specifications 195 Frequency specifications 196 Duty cycle and pulse width specifications 196 Frequency sensitivity and trigger level specifications for voltage measurements 197 Frequency sensitivity specifications for current measurements 198 Peak hold specifications for dc voltage and current measurements 198 Frequency counter divide by 1 specifications 199 Frequency counter divide by 100 Lal specifications 199 Square wave output specifications 200 Display update rate approximate 201 Input impedance 202 U1253B User s and Service Guide KEYSIGHT TECHNOLOGIES Keysight U1253B True RMS OLED Multimeter User s and Service Guide 1 Getting Started Introducing the Keysight U1253B True RMS OLED Multimeter 2 Check the shipment 4 Adjusting the tilt stand 5 The front panel ata glance 8 The rear panel ata glance 9 The rotary switch at a glance 10 The keypad ata glance 11 The display ata glance 14 Selecting display with the Shift button 20 Selecting display with the Dual button 22 Selecting display with the Hz button 25 The terminals ata glance 27 This chapter contains information on the U1253B true RMS OLED multimeter front panel rotary switch keypad display terminals and rear panel 1 Getting Started Introducing the Keysight U1253B True RMS OLED Multimeter The key features of the true RMS OLED mul
106. t d Q to select frequency counter E 99 kHz 200 mVrms Hz 100 kHz Press to select divide by 100 frequency 99 999 MHz 600 mVrms 5 2 kHz counter a 10 MHz 5520 output 5520A output Turn the rotary switch to the a position 7 Press OQO to select temperature measurement 40 C to 0 1 C 8 13 14 1372 C 100 C 2 15 Turn the rotary switch to the UA position a 16 Press YI to select ACUA measurement M a a Turn the rotary switch to the mA A 5 amp 5 position 440 mA 400 mA 0 65 mA P Press Q to select AC mA measurement i 50 mA 1 kHz 0 37 mA 440 mA 400 mA 45 Hz 3 mA 400 mA 1 kHz 3 mA U1253B User s and Service Guide 155 6 Performance Tests and Calibration Table 6 2 Performance verification tests continued Press CD to select DC A measurement Press CD to select AC A measurement Turn the rotary switch to the OUT 5 position 120 Hz 50 o eme 4800Hz 50 260 mz OUT kad duty cycle 100 Hz 50 P 0 398 1 156 U1253B User s and Service Guide Performance Tests and Calibration 6 Table 6 2 Performance verification tests continued Reference Test function Range signals values Measure with 34410A ms amplitude 4800 Hz 99 609 Notes for performance verification tests 1 The additional error to be added for frequency gt 20 kHz and signal input lt 10 of range 300 counts of LSD per kHz 2 An accuracy of 0 05 10 can be achieved by usin
107. t gt Variation count Reading gt setting R flashes Update Figure 3 3 Refresh hold mode operation e For voltage and current measurements the held value will not be updated if the reading is below 500 counts e For resistance and diode measurements the held value will not be updated if the reading is OL open state e For all types of measurement the held value will not be updated until the reading has reached a stable state U1253B User s and Service Guide 67 3 Functions and Features Null Relative The Null function subtracts a stored value from the present measurement and displays the difference between the two 1 Press to store the displayed reading as the reference value to be subtracted from subsequent measurements and to set the display to zero J PEHE i is displayed Null can be set for both auto and manual range settings but not in the case of an overload 2 Press to view the stored reference value P Pt Fit ET and the stored reference value are displayed for 3 seconds 3 Press Gnu within the 3 seconds when HER EE and the stored reference value is displayed to exit this mode e n resistance measurement mode the multimeter will read a non zero value even when the two test leads are in direct contact because of the resistance of these leads Use the Null function to zero adjust the display e In DC voltage measurement mode thermal effects will influence the a
108. t to being changed without notice in future editions Further to the max imum extent permitted by applicable law Keysight disclaims all warran ties either express or implied with regard to this manual and any infor mation contained herein including but not limited to the implied warran ties of merchantability and fitness for a particular purpose Keysight shall not be liable for errors or for inciden tal or consequential damages in con nection with the furnishing use or performance of this document or of any information contained herein Should Keysight and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms the warranty terms in the separate agreement shall control Technology Licenses The hardware and or software described in this document are furnished under a license and may be used or copied only in accor dance with the terms of such license Restricted Rights Legend U S Government Restricted Rights Soft ware and technical data rights granted to the federal government include only those rights customarily provided to end user cus tomers Keysight provides this customary commercial license in Software and techni cal data pursuant to FAR 12 211 Technical Data and 12 212 Computer Software and for the Department of Defense DFARS 252 227 7015 Technical Data Commercial Items and DFARS 227 7202 3 Rights in Commercial Com
109. temperature in C or F is displayed in upper right corner If C F or F C dual display is selected in the Setup then the secondary display will indicate the temperature in the other unit as opposed to the primary display If single unit display is selected in the Setup there will be no secondary display Ambient temperature in C or F is displayed in upper right corner Select 0 C compensation by pressing C 4 Temperature C F Notes for selecting display with DUAL button 1 Depends the relevant setting in Setup mode 24 U1253B User s and Service Guide Getting Started 1 Selecting display with the Hz button Th e frequency measurement function is able to detect the presence of harmonic currents in neutral conductors and determine whether these neutral currents are the result of unbalanced phases or non linear loads Press to enter the Frequency measurement mode for current or voltage measurements voltage or current on the secondary display and frequency on the primary display Alternatively pulse width ms or duty cycle can be displayed on the primary display by pressing C again This allows simultaneous monitoring of real time voltage or current with frequency duty cycle or pulse width Hold for more than 1 second to resume voltage or current reading on the primary display Table 1 9 Selecting display with the Hz button Rotary switch position Function mse N A VNV
110. the Default Settings Setting thermocouple types The types of thermocouple sensor that can be selected are J type and K type The default type is K type Press Hz T UHIT to edit m i ok OO O a a Po ree b hd F aT Tr a Press Aor Y to switch between K type and J type Press Hz to save and exit or press ESC to exit without saving Figure 4 7 Thermocouple type setup Setting temperature unit The temperature unit setting at power on Four combinations of displayed unit s are available 1 Celsius only C single display 2 Celsius Fahrenheit C F dual display C on primary and F on secondary 3 Fahrenheit only F single display 4 Fahrenheit Celsius F C dual display F on primary and C on secondary 98 U1253B User s and Service Guide U1253B User s and Service Guide Changing the Default Settings 4 The temperature unit setting at power on Is locked by default and thus temperature unit editing is not allowed unless it is unlocked Press and hold for more than 1 second to unlock the temperature unit setting and the lock sign will be removed Press for more than 1 second to lock the temperature unit setting Press Hz to edit gt p i Press A or Y to change the unit Press A or Y to change the unit Press A or Y to change the unit Press Hz to save and EEC exit or press Esc to exit wit
111. timeter are DC AC and AC DC voltage and current measurements True RMS measurement for both AC voltage and current Rechargeable Ni MH battery with built in charging capability Ambient temperature readout that accompanies most measurement readouts both in single and dual display modes Battery capacity indicator Bright yellow OLED Organic Light Emitting Diode display Resistance measurement up to 500 MQ Conductance measurement from 0 01 nS 100 GQ to 500 ns Capacitance measurement up to 100 mF Frequency counter up to 20 MHz Percentage scale readout for 4 20 mA to 0 20 mA measurement Measurement of dBm with selectable reference impedance 1 ms peak hold to catch in rush voltage and current easily Temperature test with selectable 0 C compensation without ambient temperature compensation J type or K type probe for temperature measurement Frequency duty cycle and pulse width measurements Dynamic recording for minimum maximum average and present readings Data hold with manual or auto trigger and relative modes Diode and audible continuity tests Square wave generator with selectable frequency pulse width and duty cycle U1253B User s and Service Guide Getting Started 1 e Keysight GUI Application Software IR USB cable sold separately e Closed case calibration e 50 000 count precision true RMS digital multimeter designed to meet EN IEC 61010 1 2001 Category III 1000 V
112. to be the same as the last 4 digits of the instrument serial number 7 Press Cz Save to confirm the entry 8 If the number entered is the correct last 4 digits of the serial number the upper left corner of the secondary display will momentarily show PASS Now the security code has been reset to the factory default 1234 If you wish to change the security code refer to the section Changing Calibration Security Code on page 161 Make sure you record the new security code Please refer to Figure 6 6 on page 164 163 6 Performance Tests and Calibration Without entering code press View gt 1 second To exit without resetting the code press View gt 1 second Error message appears for 3 sec Press q Or to select digit Press W or A to edit selected digit Press Save when done Last 4 digit of serial number is incorrect Last 4 digit of serial number is correct The word PASS appears for 3 seconds Figure 6 6 Resetting security code to factory default 164 U1253B User s and Service Guide Performance Tests and Calibration 6 Adjustment Considerations To adjust the instrument you will need a test input cables and connectors set for receiving the reference signals for example from the Fluke 5520A calibrator or Keysight 33250A function arbitrary waveform generator and a shorting plug After each successful adjustment the s
113. ts06Ry o remem e ocana oo o ooma ncaacmaacancrocnaoracsoca 0 snmrevawannaayorteoroaewinomn U1253B User s and Service Guide Getting Started 1 The keypad at a glance The operation of each key is explained in Table 1 2 below Pressing a Key displays a related symbol and emits a sound on the beeper Turning the rotary switch to another position resets the current operation of the key Figure 1 7 shows the keypad of the U1253B Max Main Sttup Peak View 2 j i Figure 1 7 U1253B keypad U1253B User s and Service Guide 11 1 Getting Started Table 1 2 Keypad descriptions and functions son Function when pressed for less than 1 second Function when pressed for more than 1 second CG cycles through OLED display brightness enters Log Review mode Press C gt gt CG to switch levels between manual or interval logging data Press or to view first or last logged data respectively Press A or W to scroll through the logged data Press for more than 1 second to exit this mode Gs holds the current aa value enters the Dynamic Recording mode In Data Hold mode 8 press Crow Press u again to scroll through maximum again to trigger the holding of the next minimum ravage or Aga panes ia a measured value Press for more than 1 pmi E PEOP RE iviinisi cits im pEr ha second to exit this ee on nhe e display In Refresh Hold mode Press u for more than 1 second to exit this mode is updat
114. uency 1 Set the rotary switch to kai The default pulse width is 0 8333 ms and default frequency is 600 Hz as shown on the primary and secondary displays respectively 2 Press OQ to switch between duty cycle and pulse width for the primary display 3 Press or to scroll through the available frequencies there are 29 frequencies to choose from Table 3 1 Available frequencies for square wave output 0 5 1 2 5 6 10 15 20 25 30 40 50 60 75 80 100 120 150 200 240 300 400 480 600 800 1200 1600 2400 4800 U1253B User s and Service Guide 81 82 Functions and Features Press Figure 3 12 Frequency adjustment for square wave output U1253B User s and Service Guide U1253B User s and Service Guide Functions and Features 3 Selecting square wave output duty cycle 1 Set the rotary switch to OUT 2 Press CD to select duty cycle on the primary display 3 Press A or W to adjust the duty cycle The duty cycle can be stepped through 256 steps with each step equivalent to 0 390625 The best resolution the display can offer is 0 001 Press Press W Figure 3 13 Duty cycle adjustment for square wave output 83 3 Functions and Features Selecting square wave output pulse width 1 Set the rotary switch to OUT iM 2 Press CD to select pulse width ms on the primary display 3 Press A or W to adjust the pulse width The pulse width ca
115. unter function is selected press to switch between dividing the signal frequency by 1 or 100 When the rotary switch is at and the temperature measurement function is selected ETC Environment multimeter is in Peak or Dynamic Recording mode press to restart the 1 ms Peak Hold or Dynamic Recording mode U1253B User s and Service Guide 13 1 Getting Started The display at a glance The display symbols are explained in the following tables Table 1 3 General display symbols ae Type of thermocouple bt K type E J type Audible continuity f SINGLE or wd TONE depending on Setup configuration View mode for checking logged data Data logging indication Index for logging data e Positive slope for pulse width ms and duty cycle measurements e Capacitor is charging during capacitance measurement e Negative slope for pulse width ms and duty cycle measurements e Capacitor is discharging during capacitance measurement Low battery indication alternating between these two symbols Auto Power Off enabled Refresh auto Hold 14 U1253B User s and Service Guide Getting Started 1 Table 1 3 General display symbols continued Dynamic Recording mode Average value on primary display 1 ms Peak Hold mode Positive peak value on primary display 1 ms Peak Hold mode Negative peak value on primary display Hazardous voltage annunciator for measuring voltage 30 V or Overload The primary disp
116. uple types 98 Setting temperature unit 98 Setting percentage scale readout 100 Setting minimum measurable frequency 102 Setting beep frequency 103 Setting Auto Power Off mode 104 Setting power on backlight brightness level 106 Setting the power on melody 107 Setting the power on greeting screen 107 Setting baud rate 108 Setting parity check 110 Parity check setup for remote control 110 Setting echo mode 111 Setting printmode 112 Revision 113 Serialnumber 113 Voltage alert 114 M initial 115 Smooth refresh rate 119 Returning to default factory settings 120 Setting the battery type 121 Setting the Filter 122 This chapter will show you how to change the default factory settings of the U1253B true RMS OLED multimeter KEYSIGHT and other available setting options TECHNOLOGIES 4 Changing the Default Settings Selecting Setup Mode To enter Setup mode press and hold CD for more than 1 second To change a menu item setting in Setup mode perform the following steps 1 2 Press or to view the selected menu pages Press A or W to navigate to the item that needs to be changed Press Cz to enter the EDIT mode for adjusting the item you want to change When you are in the EDIT mode i Press or to select which digit to adjust li Press A or W to adjust the value ili Press OQ to exit EDIT mode without saving the changes iv Press Cr to save the changes you have made and exit the EDIT mode Pres
117. ur security code Unsecuring the instrument for calibration 158 Before you can adjust the instrument you must unsecure it by entering the correct security code from the front panel The default security code is 1234 From front panel 1 Turn the rotary switch to the v V position you may also start with another rotary switch position but here we assume that you will follow the exact steps listed in Table 6 2 2 Press OQ and Cz simultaneously to enter the Calibration Security Code entry mode 3 The secondary display will indicate CSC I 5555 where the character I signifies input U1253B User s and Service Guide U1253B User s and Service Guide Performance Tests and Calibration 6 Press or to start entering the code by editing the existing number 5555 one digit at a time Press or gt to choose which digit to edit and press A or W to edit the value Press Cu Save when done If the correct security code is entered the upper left corner of the secondary display will show the word PASS for 3 seconds If the incorrect security code is entered an error code will be displayed instead for 3 seconds after which the Calibration Security Code entry mode will appear again Please refer to Figure 6 4 on page 160 To secure the instrument again exit the unsecured mode press OQ and D simultaneously 159 6 Performance Tests and Calibration Error message
118. ut allows for a higher frequency range of up to 20 MHz to be measured e The signal is out of range if the reading is still unstable after the above step has been performed e Press C to scroll through the pulse width ms duty cycle and frequency Hz measurements U1253B User s and Service Guide Making Measurements 2 5 Agilent U1253B A CAT IV 600 V CAT Ill 1000 V 440mA A A E 7 D Red Lead Black Lead Figure 2 6 Measuring frequency U1253B User s and Service Guide 41 2 Making Measurements Measuring Resistance Conductance and Testing Continuity CAUTION 42 Disconnect circuit power and discharge all high voltage capacitors before measuring resistance or conductance or testing circuit continuity to avoid damaging the multimeter or the device under test Set up the multimeter to measure resistance as shown in Figure 2 8 Then probe the test points by shunting the resistor and read the display Press OQ to scroll through audible continuity test 7 4 depending on Setup ene A on ucan e measurement F f iz iih and resistance measurement 4 E 8 or r as shown in Figure 2 9 on page 45 Smart Q Using the offset compensation method Smart Q removes unexpected DC voltages within instrument at the input or the circuit being measured which will add error to resistance measurement Besides it also displays the bias voltage or leakage current calculated
119. ve the thermocouple along the surface until you get the lowest temperature reading 7 For quick measurement use the 0 C compensation to view the temperature variation of the thermocouple sensor The 0 C compensation assists you in measuring relative temperature immediately U1253B User s and Service Guide Making Measurements 2 Figure 2 15 Connecting the thermal probe into the non compensation transfer adapter A CAT IV 600 V CAT fit 1000 V Figure 2 16 Connecting the probe with adapter into the multimeter U1253B User s and Service Guide 55 2 Making Measurements If you are working in a constantly varying environment where ambient temperatures are not constant do the following 1 Press to select 0 C compensation This allows a quick measurement of the relative temperature 2 Avoid contact between the thermocouple probe and the surface to be measured 3 After a constant reading is obtained press to set the reading as the relative reference temperature 4 Touch the surface to be measured with the thermocouple probe 5 Read the display for the relative temperature 56 U1253B User s and Service Guide Making Measurements 2 Figure 2 17 Surface temperature measurement U1253B User s and Service Guide 57 2 Making Measurements Alerts and Warning During Measurement Overload alert 58 For your own safety look out for this alert When you see this alert immediately remove the test leads from
120. voltage and current rating and recommended type e Do not service or perform adjustments alone Under certain condition hazardous voltages may exist even with the equipment switched off To avoid dangerous electric shock service personnel must not attempt internal service or adjustment unless another person capable of rendering resuscitation or first aid is present e Do not substitute parts or modify equipment to avoid the danger of introducing additional hazards Return the product to the nearest Keysight Technologies Sales and Service office for service and repair to ensure the safety features are maintained e Do not operate damaged equipment as the safety protection features built into this product may have been impaired either through physical damage excessive moisture or any other reason Remove power and do not use the product until safe operation can be verified by service trained personnel If necessary return the product to the nearest Keysight Technologies Sales and Service office for service and repair to ensure the safety features are maintained U1253B User s and Service Guide V Environmental Conditions This instrument is designed for indoor use and in areas with low condensation The table below shows the general environmental requirements for this instrument Environmental conditions Requirements Operating temperature Full accuracy from 20 C to 55 C Operating humidity Full accuracy up to 80 R H relative
121. which are taken after at least 1 minute of warm up time e The AC and AC DC specifications are defined for measurements of sine wave and are taken after at least 1 minute of warm up time e The accuracy of the multimeter may be affected when making measurements in an environment where electromagnetic interferences or significant electrostatic charges are present U1253B User s and Service Guide 185 7 Specifications Electrical Specifications DC Specifications Table 7 1 DC accuracy of reading number of LSD Function Range Resolution Test Current or Burden Accuracy Voltage 50 000 mV l 0 001 mV 0 05 50 21 500 00 mv l 0 01 mV 0 02545 1000 0 mv e 0 1 mV 0 025 5 Voltage 5 0000 v f 0 0001 V 0 025 5 50 000 v 0 001 V 0 025 5 500 00 V l 0 01 V i 0 030 5 1000 0 v e 0 1 V 0 030 5 Notes for DC voltage specifications a 2 over range on all ranges except DC 1000 V range 1 Input impedance Refer to Table 7 17 2 The accuracy could be 0 05 5 always use the Null function to zero out thermal effect short test leads before measuring the signal 186 U1253B User s and Service Guide Table 7 1 DC accuracy of reading number of LSD continued Function Range 500 00 Q I 5 0000 kQ 50 000 kQ 500 00 kQ Resistance II 5 0000 MQ 50 000 MQ l 500 00 MQ 41 500 00 ns P Notes for resistance specifications Resolution 0 01 Q 0 0001 kQ 0 001 kQ 0 01 KQ 0 0001 MQ 0 00
122. y e Ensure proper insertion of battery in the multimeter and follow the correct polarity For the battery charger the mains supply voltage fluctuations must not exceed 10 A new rechargeable battery comes in a discharged condition and must be charged before use Upon initial use or after a prolonged storage period the battery may require three to four charge discharge cycles before achieving maximum capacity To discharge simply run the multimeter under the battery s power until it shuts down or the low battery warning appears 128 U1253B User s and Service Guide Maintenance 5 It is strongly recommended that you use the specified 24 volt DC adapter included as an accessory to charge the rechargeable battery Never rotate the rotary switch while the battery is being charged because a DC voltage of 24 V is applied to the charging terminals Follow the procedures below to charge the battery 1 Remove the test leads from the multimeter Turn the rotary switch to eee 2 3 Plug the DC adapter into a power outlet 4 Insert the red and black banana plugs 4 mm plugs of the DC adapter to the E CHG and COM terminals respectively Ensure that the polarity of the connection is correct The DC adapter can be replaced with a DC power supply set at DC 24 V with an overcurrent limit of 0 5 A 5 The display will show a countdown timer of 10 seconds for the self test to start The multimeter will output short single to
123. y Full accuracy up to 80 RH relative humidity for temperatures up to 35 C decreasing linearly to 50 RH at 55 C e Altitude 0 to 2000 meters in compliance with IEC 61010 1 2nd Edition CAT III 1000V CAT IV 600V 2000 to 3000 meters in compliance with IEC 61010 1 2nd Edition CAT Ill 1000V CAT IV 600V e Pollution degree II STORAGE COMPLIANCE 40 C to 70 C with battery removed 182 U1253B User s and Service Guide U1253B User s and Service Guide Specifications 7 SAFETY COMPLIANCE e EN IEC 61010 1 2001 e ANSI UL 61010 1 2004 e CAN CSA C22 2 No 61010 1 04 MEASUREMENT CATEGORY CAT III 1000 V CAT IV 600 V Overvoltage Protection ELECTROMAGNETIC COMPATIBILITY EMC Commercial limits compliance with EN61326 1 SHOCK AND VIBRATION Tested to IEC EN 60068 2 TEMPERATURE COEFFICIENT 0 15 x specified accuracy C from 20 C to 18 C or 28 C to 55 C COMMON MODE REJECTION RATIO CMRR gt 100 dB at DC 50 60 Hz 0 1 1 kQ unbalanced NORMAL MODE REJECTION RATION NMRR gt 90 dB at 50 60 Hz 0 1 DIMENSIONS W x H x D 94 4 x 203 5 x 59 mm WEIGHT 527 5 grams with battery WARRANTY Please refer to http www keysight com go warranty_terms e Three years for the product e Three months for the product s standard accessories unless otherwise specified Please take note that for the product the warranty does not cover e Damage from contamination e Normal wear and tear of mechan
124. z input frequency is applied to those marked with a asterix Table 6 3 Valid adjustment reference input values Funcion mango Alor vata range iene Sn Vancom tote elon Ase losin T ieren T ireren maae Short V and COM terminals 0 9 to 1 1 x reference input value 0 9 to 1 1 x reference input value 0 9 to 1 1 x reference input value 0 9 to 1 1 x reference input value 166 U1253B User s and Service Guide Performance Tests and Calibration 6 Table 6 3 Valid adjustment reference input values continued Faeion Bonge Rete npatvaue Yilrngetoreteee inp switch at LV aS VF es a U1253B User s and Service Guide 167 6 Performance Tests and Calibration Table 6 3 Valid adjustment reference input values continued Faneion mange Rete npataue Yvette apt 7 ae eee ae a Open OPEN Open terminals 0 9 to 1 1 x reference input value Capacitance 168 U1253B User s and Service Guide Performance Tests and Calibration 6 Table 6 3 Valid adjustment reference input values continued Faeion mange etree npatvaue Yvette apt Temperature Provide 0 C with ambient compensation Notes for valid adjustment reference input values 1 The minimum AC current output Fluke 5520A calibrator is 29 00 uA only Be sure to set at least 30 00 uA for the calibration source of AC uA 2 Both AC V positions must be calibrated individually 3 Be sure to recalibrate the Short using the dual banana plug with

Introducing the Keysight U1253B True RMS OLED Multimeter

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