HANDHELD DIGITAL MULTIMETER MS8268 OPERATOR`S
Contents
1. 1 The red lights at the mA and COM terminals will be off after the test leads are plugged in 2 The buzzer will sound upon misconnection of the test leads in the V or 10A terminals to warn the user At the same time the red lights at the mA and COM terminals will flash to remind the user to plug in the test leads there At A range 1 The red lights at the 10A and COM terminals will be off after the test leads are plugged in 2 The buzzer will sound upon misconnection of the test leads in the V or mA terminals to warn the user At the same time the lights at the 10A and COM terminals will flash to remind the user to plug in the test leads there 12 3 1 2 DATA HOLD mode Data Hold mode makes the meter stop updating the display Enabling Data Hold function in autorange mode makes the meter switch to Manual ranging mode but the full scale range remains the same Data Hold function can be cancelled by changing the measurement mode pressing RANGE key or push HOLD key again To enter and exit the Data Hold mode 1 Press HOLD key short press Fixes the display on the current value H is displayed 2 A second short press returns the meter to normal mode 3 1 3 Manual ranging and Autorange mode The Meter has both manual ranging and autorange options n the autorange mode the Meter selects the best range for the input detected This allows you to switch test points without hav2. Percent The unit of Duty cycle ni The input is too large for the selected UL range 2 3 Keypad See Table 2 indicated for information about the keypad operations Table 2 Keypad Key Function Operation performed RANGE VNV c 0 mA and pA 1 Press RANGE to enter the manual ranging mode 2 Press RANGE to step through the ranges available for the selected function 3 Press and hold RANGE for 2 seconds to return to autoranging SELECT DL n A mA and pA Power up Option Switches between Diode Test and Continuity check Switches between dc and ac current Disables automatic power off feature REL Any switch position Press REL to enter and exit the Relative measurement mode Hz V A mA and HA 1 Press to start the frequency counter 2 Press again to enter duty cycle duty factor mode 3 Press again to exit the frequency counter mode Table 2 Keypad continued Key Function Operation performed HOLD Any switch Press HOLD to enter and exit position the Data Hold mode LIGHT Any switch Press to turn the backlight on position The backlight will be auto off about 5 seconds later 2 4 Terminals See Table 4 indicated for information about the terminals Table 4 Terminals Terminal Description Return terminal for all measurements COM C Receiving the black test lead or the com
3. 1 5V AAA Dimensions 195x92x55 mm Weight 400g Approx battery included 4 2 Measurement specifications Accuracy is specified for one year after calibration at operating temperatures of 18 C to 28 C with relative humidity at 096 to 7596 Accuracy specifications take the form of of Reading Number of Least Significant Digits 4 2 1 DC Voltage Range Resolution Accuracy 400mV 0 1mV 4V 1mV 0 7 of rdg 2 digits 40V 10mV 400V 100mV 1000V 1V 0 8 of rdg 2 digits Input impedance 10M Max input voltage 1000Vdc or 750V ac rms 24 4 2 2 AC Voltage Range Resolution Accuracy 400mV 0 1mV 3 0 of rdg 3 digits 4V 1mV 40V 10mV 0 8 of rdg 3 digits 400V 100mV 750V 1V 1 0 of rdg 3 digits Input impedance 10MQ Max input voltage 1000Vdc or 750V ac rms Frequency Range 40Hz 200Hz for 4V range 40Hz 1kHz for other ranges Response Average calibrated in rms of sine wave 4 2 3 Resistance Range Resolution Accuracy 400 00 0 10 4 000kQ 10 40 00kQ 10Q 1 29696 of rdg 2 digits 400 0kQ 100Q 4 000MQ 1kQ 40 00MQ 10kQ 2 0 of rdg 5 digits Open Circuit Voltage approx 250mV Overload protection 250V dc or 250Vac rms 4 2 4 Audible continuity 4 2 5 Diode Range Resolution Function gt doni Display bead approx forward voltage of diode Forward
4. DC Current approx 1mA Reversed DC Voltage approx 1 5V Overload protection 250Vdc or 150Vac rms 4 2 6 Transistor Range Description Test Condition Display read approx HFE Base Current hFE value 0 1000 of transistor approx 10uA Vce under test all type approx 2 8V Overload protection Resettable Fuse FA00mA 250V Range Continuity beeper ed lt 500 Open circuit voltage approx 0 5V Overload protection 250Vdc or 250Vac rms 25 4 2 7 Capacitance Range Resolution Accuracy 4nF 1pF 5 0 of rdg 5 digits 40nF 10pF 400nF 100pF 4uF 1nF 3 0 of rdg 3 digits 401F 10nF 200uF 100nF Overload protection 250V dc or 250Vac rms 4 2 8 Frequency Range Resolution Accuracy 9 999Hz 0 001 Hz 99 99Hz 0 01 Hz gt a ES 2 0 of rdg 5 digits 99 99kHz 10Hz 199 9kHz 100Hz gt 200kHz 100Hz Unspecified gt 200kHz 26 By Hz range Overload protection 250V dc or 250V ac rms Input Voltage range 0 6V 3V ac rms Input voltage must be enlarged with increasing frequency under measurement Frequency Response 10Hz 200kHz sine wave 0 5Hz 200kHz square wave By AC Voltage range Input Voltage range 1V 750Vac rms Input voltage must be enlarged with increasing frequency under measurement Frequency Response 1Hz 10kHz sine wave Maximum input voltage 1000V dc or 750V ac rms Input impeda
5. With a low battery the Meter might produce false readings that can lead to electric shock and personal injury Do not measure voltages above 600V in Category Ill or 1000V in Category II installations 1 1 3 Symbols Symbols used in this manual and on the instrument Cautior refer to the instruction manual A Incorrect use may result in damage to the device or its components Dangerous voltage may be present AC Alternating Current DC Direct Current AC or DC Earth ground Double insulated li pl P a Fuse CE Conforms to European Union directives 1 1 4 Instructions Remove test leads from the Meter before opening the Meter case or battery cover When servicing the Meter use only specified replacement parts Before opening up the instrument always disconnect from all sources of electric current and make sure you are not charged with static electricity which may destroy internal components 4 Any adjustment maintenance or repair work carried out on the meter while it is live should be carried out only by appropriately qualified personnel after having taken into account the instructions in this present manual A qualified person is someone who is familiar with the installation construction and operation of the equipment and the hazards involved He is trained and authorized to energize and de energize circuits and equipment in accordance with estab
6. instrument complies with IEC 1010 1 61010 1QIEC 2001 CAT II 1000V and CAT III 600V overvoltage standards See Specifications To get the best service from this instrument read carefully this user s manual and respect the detailed safety precautions International symbols used on the Meter and in this manual are explained in chapter 1 1 3 1 1 Precautions safety measures 1 1 1 Preliminary Measurement category Ill is for measurements performed in the building installation NOTE Examples are measurements on distribution boards circuit breakers wiring including cables bus bars junction boxes switches socket outlets in the fixed installation and equipment for industrial use and some other equipment for example stationary motors with permanent connection to the fixed installation Measurement category II is for measurements performed on circuits directly connected to the low voltage installation NOTE Examples are measurements on household appliances portable tools and similar equipment Measurement category is for measurements performed on circuits not directly connected to MAINS NOTE Examples are measurements on circuits not derived from MAINS and specially protected internal MAINS derived circuits In the latter case transient stresses are variable for that reason requires that the transient withstand capability of the equipment is made known to the user 1 When using this Multimeter the user must o
7. plug of the special multi function socket Input for voltage resistance capacitance frequency diode and continuity E AE measurements Receiving the red test lead bes or the plug of the special multi function Socket Input for hFE and 0 001mA to 400mA hFE pA current measurements Receiving the red mA test lead or the plug of the special multi function socket Input for 400mA to 10A current 10A measurements Receiving the red test lead 10 2 5 Rotary switch A eleven position rotary selector switch gives access to the following quantities Current 10A Current mA Current uA DC Voltage AC Voltage OFF off position Resistance Diode and Continuity with beep Capacitance Transistor hFE Frequency 2 6 Accessories Delivered with the multimeter N User s manual N Test leads N Special Multi function socket 3 FUNCTION DESCRIPTION 3 1 General Functions 3 1 1 Misconnection alarm system The input terminals of the meter are equipped with sound and light alarms against misconnection of test leads AtV 2 dF and gt ranges 1 The red lights at the V and COM terminals will be off after the test leads are plugged in 2 The buzzer will sound upon misconnection of the test leads in the mA or 10A terminals to warn the user At the same time the lights at the V and COM terminals will flash to remind the user to plug in the test leads there At pA mA and hFE ranges
8. HANDHELD DIGITAL MULTIMETER MS8268 OPERATOR S INSTRUCTION MANUAL Table of Contents TITLE 1 GENERAL INSTRUCTIONS 1 1 Precaution safety measures 1 1 1 Preliminary 1 1 2 During use 1 1 3 Symbols 1 1 4 Instructions 1 2 Safety mechanisms 2 DESCRIPTION 2 1 Instrument Familiarization 2 2 LCD Display 2 3 Keypad 2 4 Terminals 2 5 Rotary switch 2 6 Accessories 3 FUNCTION DESCRIPTION 3 1 General Functions 3 1 1 Misconnection alarm system 3 1 2 DATA HOLD mode 3 1 3 Manual ranging and Autorange mode 3 1 4 Battery Saver 3 1 5 Relative measurement mode 3 2 Measurement Functions 3 2 1 AC and DC Voltage measurement I PAGE OBRN a 10 11 11 12 12 12 13 13 14 14 15 15 Table of Contents TITLE 3 2 2 Resistance measurement 3 2 3 Diode Test 3 2 4 Continuitv Check 3 2 5 Transistor measurement 3 2 6 Capacitance measurement 3 2 7 Frequencv and Dutv Cvcle measurement 3 2 8 Current measurement 4 TECHNICAL SPECIFICATIONS 4 1 GENERAL SPECIFICATIONS 4 2 Measurement specifications 4 2 1 DC Voltage 4 2 2 AC Voltage 4 2 3 Resistance 4 2 4 Audible continuity 4 2 5 Diode 4 2 6 Transistor 4 2 7 Capacitance 4 2 8 Frequency 4 2 9 DC CURRENT 4 2 10 AC CURRENT 5 MAINTENANCE 5 1 General Maintenance 5 2 Fuse replacement 5 3 Battery replacement II PAGE 16 17 18 18 19 20 22 23 23 24 24 25 25 25 26 26 26 26 28 28 29 29 29 30 1 GENERAL INSTRUCTIONS This
9. bserve all normal safety rules concerning Protection against the dangers of electric current Protection of the Multimeter against misuse For your own safety only use the test probes supplied with the instrument Before use Check that they are in good condition 1 1 2 During use If the meter is used near noise generating equipment be aware that display may become unstable or indicate large errors Do not use the meter or test leads if they look damaged Use the meter only as specified in this manual otherwise the protection provided by the meter may be impaired Use extreme caution when working around bare conductors or bus bars Do not operate the meter around explosive gas vapor or dust Verify a Meter s operation by measuring a known voltage Do not use the Meter if it operates abnormally Protection may be impaired When in doubt have the Meter serviced Uses the proper terminals function and range for your measurements When the range of the value to be measured is unknown check that the range initially set on the multimeter is the highest possible or wherever possible choose the autoranging mode To avoid damages to the instrument do not exceed the maximum limits of the input values shown in the technical specification tables When the multimeter is linked to measurement circuits do not touch unused terminals 2 Do not apply any voltage measurement between the 10A termina
10. cement fuses only with specified ratings F 10A 250V 26 3x32 T Rejoin the battery cover and secure by the two screws 5 3 Battery replacement A To avoid false readings which could lead to possible electric shock or personal injury replace the battery as soon as the battery indicator EI J appears Before replacing the battery disconnect fest leads and or any connectors from any c rcuit under fest turn the meter off and remove test leads from the input terminals To replace the battery see Figure 2 1 Set rotary switch to the OFF position 2 Disconnect test leads and or any connectors from the terminals 3 Use a screwdriver to unscrew the two screws secured on the battery cover 4 Take out the battery cover from the meter 5 Remove the used batteries 6 Replace with three new 1 5V batteries AAA 7 Rejoin the battery cover and secure by the two screws 30 Figure 2 Battery and Fuse Replacement A CAUTION Using this appliance in an environment with a strong radiated radio frequency electromagnetic fiela9aoproximately 3Vm may influence its measuring accuracy The measuring result can be strongly deviating trom the actual value 31
11. e if an erroneous reading is suspected short the V terminal and the COM terminal and make sure the zero display 15 N 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 improves the accuracy of the dc measurement by ensuring that the input protection circuits are not activated 3 2 2 Resistance measurement A To avoid electrical shock and or damage to the instrument disconnect circuit power and discharge all high voltage capacitors before measuring resistance The Meter s resistance ranges are 400 0 Q 4 000kQ 40 00kO 400 0kO 4 000MO and 40 00MQ To measure resistance 1 Set the rotary switch to Q range 2 Connect the black and red test leads to the COM and Q terminals respectively 3 Connect the test leads to the circuit being measured and read the displayed value Some tips for measuring resistance N The measured value of a resistor in a circuit is often different from the resistor s rated value This is because the Meter s test current flows through all possible paths between the probe tips N In order to ensure the best accuracy in measurement of low resistance short the test leads before measurement and memory the test probe resistance in mind This necessary to subtract for the resistance of the test leads 16 N The resistance function can produce
12. e and battery replacement instructions Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration performance test and service information 5 1 General Maintenance To avoid electrical shock or damage to the meter do not get water inside the case Remove the test leads and any input signals before opening the case Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents Dirt or moisture in the terminals can affect readings To clean the terminals N Turn the meter off and remove all test leads N Shake out any dirt that may be in the terminals N Soak a new swab with a cleaning and oiling agent such as WD 40 N Work the swab around in each terminal The oiling agent insulates the terminals from moisture related contamination 5 2 Fuse replacement Before replacing the fuse disconnect test leads and or any connectors from any circuit under test To prevent damage or injury replace the fuse only with specified ratings To replace the Meter s fuse see Figure 2 1 Set rotary switch to the OFF position 29 2 Disconnect test leads and or any connectors from the terminals 3 Use a screwdriver to unscrew the two screws secured on the battery cover 4 Take out the battery cover from the meter 5 Remove the fuse by gently prying one end loose then sliding the fuse out of its bracket 6 Install the repla
13. e side of the break Reversing the leads will give a negative reading but will not damage the Meter 6 Turn on power to the circuit then read the display Be sure to note the measurement units at the right side of the display uA mA or A When only the figure OL displayed it indicates overrange situation and the higher range has to be selected 7 Turn off power to the circuit and discharge all high voltage capacitors Remove the Meter and restore the circuit to normal operation 4 TECHNICAL SPECIFICATIONS 4 1 GENERAL SPECIFICATIONS N Environment conditions 1000V CAT Il and 600V CAT III Pollution degree 2 Altitude 2000m Operating temperature 0 40 C 32 F 122 F 8096RH 10 C non condensing Storage temperature 10 60 C 14 F 140 F 7096 RH battery removed N Temperature Coefficient 0 1x specified accuracy C 18 C or gt 28 C N MAX Voltage between terminals and earth ground 750V AC rms or 1000V DC N Fuse Protection HA and mA Resettable fuse 400mA 250V 23 10A F 10A 250V 26 3x32 mm Sample Rate 3 times sec for digital data Display 3 3 4 digits LCD display Automatic indication of functions and symbols Range selection automatic and manual Over Range indication LCD will display OL Low battery indication The E I is displayed when the battery is under the proper operation range Polarity indication displayed automatically Power source DC 4 5V _ Battery type
14. eaning The battery is low soon as the battery indicator appears Warning To avoid false readings which could lead to possible electric shock or personal injury replace the battery as Indicates negative readings Indicator for ac voltage or current input calibrated to indicate equivalent rms value of a sine wave AC voltage and current are displayed as AC the average of the absolute value of the DC Indicator for dc voltage or current range with the best resolution AUTO The Meter is in the Autorange mode in which the meter automatically selects the 7 Symbol Meaning RELA Indicator for the Relative measurement DL Indicator for the Diode Test mode hFE Indicator for the transistor test mode on Indicator for the Continuity Check mode IH Indicator for the Data Hold mode V mV V walls The unit of voltage mV Millivolt 1x10 or 0 001 volts A Amperes amps The unit of current illi 3 A mA pA mA Milliamp 1x10 or 0 001 amperes HA Microamp 1x108 or 0 000001 amperes Q Ohm The unit of resistance Q kQ MO kQ Kilohm 1x10 or 1000 ohms MO Megohm 1x10 or 1 000 000 ohms Hz Hertz The unit of frequency in cycles second Hz kHz MHZ KHz Kilohertz 1x10 or 1000 hertz MHz Megahertz 1x106 or 1 000 000 hertz F Farad The unit of capacitance F nF uF Microfarad 1x10 or 0 000001 farads unn nF Nanofarad 1x10 or 0 000000001 farads
15. enough voltage to forward bias silicon diode or transistor junctions causing them to conduct To avoid this do not use the 40MQ range for in circuit resistance measurements N On 40M O range the meter may take a few seconds to stabilize reading This is normal for high resistance measuring N When the input is not connected i e at open circuit the figure OL will be displayed for the overrange condition 3 2 3 Diode Test A To avoid electrical shock and or damage to the instrument disconnect circuit power and discharge all high voltage capacitors before testing diodes Use the diode test to check diodes transistors and other semiconductor devices The diode test sends a current through the semiconductor junction then measures the voltage drop across the junction A good silicon junction drops between 0 5V and 0 8V To test a diode out of a circuit 1 Set the rotary switch to PF m range 2 Press the SELECT key to activate Diode Test 3 Connect the black and red test leads to the COM and VQ terminals respectively 4 For forward bias readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode 17 5 The meter will show the approx forward voltage of the diode In a circuit a good diode should still produce a forward bias reading of 0 5V to 0 8V however the reverse bias reading can vary depending on the resistance of othe
16. ing to reset the range n the manual ranging mode you select the range This allows you to override autorange and lock the meter in a specific range The Meter defaults to the autorange mode in measurement functions that have more than one range When the Meter is in the autorange mode AUTO is displayed To enter and exit the manual range mode 1 Press RANGE key The Meter enters the manual ranging mode AUTO turns off Each presses of RANGE key increments the range When the highest range is reached the Meter wraps to the lowest range 13 NOTE f you manually change the measurement range after entering the Data Hold modes the Meter exits this mode 2 To exit the manual ranging mode press and hold down RANGE key for two seconds The Meter returns to the autorange mode and AUTO is displayed 3 1 4 Battery Saver The Meter enters the sleep mode and blanks the display if the Meter is on but not used for 15 minutes Press the HOLD key or rotate the rotary switch to wake the meter up To disable the Sleep mode hold down the SELECT key while turning the meter on One minute before power off the beeper will sound 5 sounds The beeper will sound again before power off 3 1 5 Relative measurement mode The Meter will display relative measurement in all functions except frequency To enter and exit the relative measurement mode 1 With the Meter in the desired function touch the test leads to the circuit on which you wa
17. l and the COM terminal Caution when working with voltages above 60Vdc or 30Vac rms Such voltages pose a shock hazard When using the probes keep your fingers behind the finger guards When making connections connect the common test lead before connecting the live test lead when disconnecting disconnect the live test lead before disconnecting the common test lead Before changing functions disconnect the test leads from the circuit under test For all dc functions including manual or auto ranging to avoid the risk of shock due to possible improper reading verify the presence of any ac voltages by first using the ac function Then select a dc voltage range equal to or greater than the ac range Disconnect circuits power and discharge all high voltage capacitors before testing resistance continuity diodes or capacitance Before measuring current check the meter s fuse and turn off power to the circuit before connecting the meter to the circuit Never perform resistance or continuity measurements on live circuits n TV repair work or when carrying out measurements on power switching circuits remember that high amplitude voltage pulses at the test points can damage the multimeter Use of a TV filter will attenuate any such pulses Use three 1 5V AAA batteries properly installed in the Meter s battery case to power the Meter 3 Replace the batteries as soon as the battery indicator EJ appears
18. lished practices When the instrument is opened up remember that some internal capacitors can retain a dangerous potential even after the instrument is switched off If any faults or abnormalities are observed take the instrument out of service and ensure that it cannot be used until it has been checked out If the meter is not going to be used for a long time take out the battery and do not store the meter in high temperature or high humidity environment 1 2 Safety mechanisms Misconnection alarm system If the maximum range is repeatedly exceeded a continuous audible signal warns the user in DCV ACV DC pA ACA DC mA AC mA DC 10A and AC 10A functions 2 DESCRIPTION 2 1 Instrument Familiarization maz f Autorange C AUTO we BI RELA hre i og De AC npmFAV Multimeter L J m A RANGE seer S i Y HOLD LIGHT 2 GEN 2 1000v CAT Il EM 600V CAT Ill AVQHz 1 LCD display 2 nad 3 Rotary switch 4 Terminals 6 2 2 LCD Display See Table 1 indicated for information about the LCD display uuo DE 6 D he EH DC Gem Table 1 Display Symbols continued AC n u mm PaL PL FAV Table 1 Display Symbols Symbol M
19. nce 10MQ By AC Current range Input current range 5pA 4000uA ac rms for uA range 5mA 400mA ac rms for mA range Input current must be enlarged with increasing frequency under measurement Frequency Response 1Hz 10kHz sine wave Maximum input current 400mA dc or 400mA ac rms for u A and mA ranges 27 4 2 9 DC CURRENT Range Resolution Accuracy 4001A 0 1uA 4000uA 1uA ma t 9 40mA O 01mA 1 2 of rdg 3 digits 400mA 0 1mA 10A 10mA 2 0 of rdg 5 digits Overload protection Maximum input current 400mA dc or 400mA ac rms for uA and mA ranges 10A dc or 10A ac For measurements gt 5A 4 minutes maximum ON to measure F 10A 250V fuse for 10A range Resettable fuse F400mA 250V HA and mA ranges rms for 10A ranges 10 minutes OFF 4 2 10 AC CURRENT Range Resolution Accuracy 4001A 0 1uA 4000uA 1uA a 9 40mA O 01mA 1 5 of rdg 5 digits 400mA 0 1mA 10A 10mA 3 0 of rdg 7 digits Overload protection F 10A 250V fuse for 10A range Resettable fuse 400mA 250V for u A and mA ranges Maximum input current 400mA dc or 400mA ac rms for u A and mA ranges 10A dc or 10A ac rms for 10A ranges Frequency Range 40Hz 1kHz Response Average calibrated in rms of sine wave For measurements gt 5A 4 minutes maximum ON to measure 10 minutes OFF 28 5 MAINTENANCE This section provides basic maintenance information including fus
20. nect circuit power and discharge all high voltage capacitors before measuring capacitance Use the dc voltage function to confirm that the capacitor is discharged Capacitance is the ability of a component to store an electrical charge The unit of capacitance is the farad F Most capacitors are in the nanofarad to microfarad range The Meter measures capacitance by charging the capacitor with a known current for a known period of time measuring the resulting voltage then calculating the capacitance The measurement takes about 1 second per range The Meter s capacitance ranges are 4 000nF 40 00nF 400 0nF 4 000pF 40 00uF and 200 0uF 19 To measure capacitance 1 Set the rotary switch to 4k range 2 Connect the black and red test leads to the COM and 4k terminals respectively or you can measure the capacitance by using the special Multi Function Socket 3 Connect the test leads to the capacitor being measured and read the displayed value Some tips for measuring capacitance N The meter may take a few seconds 200 uF range 30 seconds to stabilize reading This is normal for high capacitance measuring N To improve the accuracy of measurements less than 4nF subtract the residual capacitance of the Meter and leads 3 2 7 Frequency and Duty Cycle measurement A Do not measure Frequency on high voltage gt 250Vde or 250Vac rms to avoid electrical shock hazard and or damage to the instrument To measu
21. nt future measurement to be based 2 Press REL key to store the measured value and activate the relative measurement mode The difference between the reference value and subsequent reading is displayed 3 Press REL key for more than 2 seconds to return the Meter to normal operation 14 3 2 Measurement Functions 3 2 1 AC and DC Voltage measurement A To avoid electrical shock and or damage to the instrument do not attempt to take any voltage measurement that might exceed 1000Vac or 750Vac rms To avoid electrical shock and or damage to the instrument do not apply more than 1000Vdc or 750Vac rms between the common terminal and the earth ground The polarity of ac alternating current voltage varies over time the polarity of dc direct current voltage is constant The Meters DC voltage ranges are 400 0mV 4 000V 40 00V 400 0V and 1000V AC voltage ranges are 400 0mV 4 000V 40 00V 400 0V and 750V AC 400 0mV range only exists in manual ranging mode To measure ac or dc voltage 1 Set rotary switch to the DCV or ACV range 2 Connect the black and red test leads to the COM and V terminals respectively 3 Connect the test leads to the circuit being measured 4 Read the displayed value The polarity of red test lead connection will be indicated when making a DCV measurement NOTE N Unstable display may occur especially at 400mV range even though you do not put test leads into input terminals in this cas
22. r pathways between the probe tips 3 2 4 Continuity Check A To avoid electrical shock and or damage to the instrument disconnect circuit power and discharge all high voltage capacitors before testing for Continuity To test for continuity 1 Set the rotary switch to PF em range 2 Press the SELECT key to activate Continuity Check 3 Connect the black and red test leads to the COM and Q terminals respectively 4 Connect the test leads to the resistance in the circuit being measured 5 When the test lead to the circuit is below 5002 a continuous beeping will indicate it Note N Continuity test is available to check open short of the circuit 3 2 5 Transistor measurement A To avoid electrical shock and or damage to the instrument do not apply more than 250Vdc or 250Vac rms between the hFE terminal and the COM terminal 18 To test the hFE of transistor 1 Set the rotary switch to hFE range 2 Connect the com plug and plug of the special multi function socket to the COM and hFE terminals 3 Determine whether the transistor to be tested is NPN or PNP type and locate the Emitter Base and Collector leads 4 Insert leads of the transistor into proper holes of the special multi function socket 5 The meter will show the approx hFE value at test condition of base current 10 u A and Vce 2 8V 3 2 6 Capacitance measurement VAN To avoid electrical shock and or damage to the instrument discon
23. re frequency or Duty Cycle A To measure frequency by Hz range Set the rotary switch to Hz range Connect the black and red test leads to the COM and Hz terminals respectively Connect the test leads across the source or load under measurement and read the displayed value To make a duty cycle measurement press the Hz key again Read the percent of duty cycle on the display 20 Note N Reading is possible at input voltages above 3V rms but the accuracy is not guaranteed N In noisy environment it is preferable to use shield cable for measuring small signal B To measure frequency by AC Voltage or AC Current range Set the rotary switch to the desired range AC Voltage or AC Current Connect the black and red test leads to the COM and V or mA terminals respectively Connect the meter to the signal source then press Hz key For 5V logic signals TTL use the 4Vdc range For 12V switching signals in automobiles use the 40Vdc range Read the frequency of the AC signal on the display To make a duty cycle measurement press the Hz 96 key again Read the percent of duty cycle on the display Note N If the reading is 0 000Hz or is unstable the input signal may be below or near the trigger level These problems can frequently be fixed by selecting a lower range which increases the sensitivity of the meter In the DCV function the lower ranges also have lower trigger levels N If a reading seem
24. s to be a multiple of what you expect the input signal may be distorted 21 Distortion can cause multiple triggering of the frequency counter Selecting a higher voltage range might solve this problem by decreasing the sensitivity of the meter Also try selecting a dc range which raises the trigger level In general the lowest frequency displayed is the correct one 3 2 8 Current measurement To avoid damage to the Meter or injury if the fuse blows never attempt an in circuit current measurement where the open circuit potential fo earth is greater than 250V To avoid damage to the meter check the meter s fuse before proceeding Use the proper terminals function and range for your measurement Never place the probes in parallel with a circuit or component when the leads are plugged into the current terminals The Meter s current ranges are 400 0uA 4000A 40 00mA 400 0mA and 10 00A To measure current 1 Turn off power to the circuit Discharge all high voltage capacitors 2 Set the rotary switch to the uA mA or A range 3 Press the SELECT key to select DCA or ACA measuring mode 4 Connect the black test lead to the COM terminal and the red test leads to the mA terminal for a maximum of 400mA For a maximum of 10A move the red test lead to the 10A terminal 22 5 Break the circuit path to be tested Touch the black probe to the more negative side of the break touch the red probe to the more positiv
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