AM-250 Digital Multimeter Product Manual
Contents
1. ACaution Using Resistance Continuity Diode or Capacitance function in a live circuit will produce false results and may damage the instrument In many cases the suspected component must be disconnected from the circuit to obtain an accurate measurement reading Diode test Capacitance functions Defaults at 0 Press AF SELECT button momentarily 2 times to select Ft Diode test function Normal forward voltage drop forward biased for a good silicon diode is between 0 400V to 0 900V A reading higher than that indicates a leaky diode defective A zero reading indicates a shorted diode defective An OL indicates an open diode defective Reverse the test leads connections reverse biased across the diode The digital display shows OL if the diode is good Any other readings indicate the diode is resistive or shorted defective Defaults at N Press SELECT button momentarily 3 times to select AH Capacitance function Relative zero A mode can be used to zero out the parasitic capacitance of the leads and the internal protection circuitry of the meter when measuring low capacitance in the order of Pico Farad pF ACaution Discharge capacitors before making any measurement Large value capacitors should be dischar2. Relative zero A mode Relative zero A mode allows the user to offset the meter consecutive measurements with the displaying reading as the reference value The display will now show readings relative to the stored reference value That is display reading stored value Press the A button momentarily to activate or to exit relative zero mode Backlighted display Press the SELECT button for 1 second or more to turn on or off the display backlight function Manual or Auto ranging Press the RANGE button momentarily to select manual ranging mode and the meter will remain in the range it was in the LCD symbol turns off Press the button momentarily again to step through the ranges Press and hold the button for 1 second or more to resume auto ranging mode Note Manual ranging mode feature is not available in Hz amp Cx functions HOLD D The hold feature freezes the display for later view Press the HOLD button momentarily to activate or to exit the hold feature MAX D The max feature compares and displays the measured maximum value as fast as 25ms in a single range and with automatic up range capability Press the MAX DI button for 1 second or more to activate or to exit the max feature in the voltage or current functions Sleep Mode The meter will enter a low power consumption sleep mode automatically to extend battery life after approximately 30 minutes of no rotary switch or push button operations To w
3. Fax 425 446 6390 Fax 905 890 6866 Non Warranty Repairs and Replacement Europe European non warranty units can be replaced by your Amprobe Test Tools distributor for a nominal charge Please check the Where to Buy section on www amprobe com for a list of distributors near you Amprobe Test Tools Europe In den Engematten 14 79286 Glottertal Germany tel 49 0 7684 8009 0 Correspondence only no repair or replacement available from this address European customers please contact your distributor customers please contact your distributor AM 250 Digital Multimeter 3 3 4 digits 4000 counts LCD display Push buttons for special functions amp features Selector to turn the Power On or Off and select a function 4 Input Jack for 10A 20A for 30sec current function 6 Input Jack for all functions EXCEPT current uA mA A function O Common Ground reference Input Jack for all functions 7 Input Jack for milli amp and micro amp functions CONTENTS SY dl UNPACKING AND INSPECTION 0 0 00 eeeceeeceeeceeeeeeeeeeeeaeeeeaeesaeeeeaeeseeeeaeeeeeeeeeeeeee INTRODUCTION Seege Seege sl re rase d cent Aah OPERATION es Eed iste ce enr en EA LE O Resistance and Continuity FUNCTIONS 00 0 ceceecceeeeeeteeeeeeeeeeseeeeeeeaeeeeeeeseeees Diode test Capacitance FUNCTIONS cecceceeeceeceeseeeeeeeeeeeeeeseteaecaeseeeeaeeeeeneeaes HA MA and A Current functions sc
4. 10 00A 1 8 4d 0 03V A 10A continuous 20A for 30 second max with 5 minutes cool down interval Ohms Range Accuracy 400 00 0 8 6d 4 000kO 40 00kO 400 0kN 0 6 4d 4 000MQ 1 0 4d 40 00MQ 2 0 4d Open Circuit Voltage 0 4VDC typical Audible Continuity Tester Audible threshold between 100 and 1200 Capacitance Range Accuracy 500 0nF 5 000UF 50 00UF 500 0pF KIELEN 3000UF 3 5 6d Additional 50 00nF range accuracy is not specified Accuracies with film capacitor or better Specified with battery voltage above 2 8V approximately half full battery Accuracy decreases gradually to 12 at low battery warning voltage of approximately 2 4V Hz Frequency Range Accuracy 50 00Hz 500 0Hz 5 000kHz 0 50 00kHz 500 0kHz 1 000 MHz ea Additional 5 000Hz range accuracy amp sensitivity are not specified Accuracy is specified at lt 20VAC rms Input Signal Square wave with duty cycle gt 40 amp lt 70 or Sine wave Vrms AC Sensitivity 10Hz 20Hz gt Sine 0 9Vrms 20Hz 500kHz gt 2 6Vp or Sine 1 9Vrms 500kHz 1MHz gt 4 2Vp or Sine 3Vrms Update Rate 2 per second nominal Diode Tester Open Circuit Voltage Test Current Typical lt 1 6 VDC 0 25mA MAINTENANCE AND REPAIR If there appears to be a malfunction during the operation of the meter the following
5. AC 4 000V range Total Accuracy Specified Accuracy 700 digits AC 400 0pA range Total Accuracy Specified Accuracy 300 digits Other function ranges Total Accuracy Specified Accuracy 40 digits Performance above 3V m is not specified Overload Protections HA amp mA 0 63A 500V IR200kA F Fuse A 12 5A 500V IR20kA F Fuse V 1050Vrms 1450Vpeak IL amp Others 600VDC VAC rms Transient protection 6 5kV 1 2 50us surge Power Supply 1 5V AAA Size NEDA 24G or IEC R03 battery X 2 Power Consumption 3 2 mA typical Low Battery Below approx 2 4V Sleep Mode Timing Idle for 30 minutes Sleep Mode Consumption 300A typical for AM 250 360UA typical for AM 270 Dimension L193mm X W97mm X H46 7 60 X 3 82 X 1 81 IN Weight 370 g 0 816lb Special Features 25ms Max Hold Data Hold Relative zero mode Beep jack input warning Back lighted display CENELEC DIRECTIVES The instruments conform to CENELEC Low voltage directive 73 23 EEC and Electromagnetic compatibility directive 89 336 EEC C EMC Conforms to EN61326 1 This product complies with requirements of the following European Community Directives 89 336 EEC Electromagnetic Compatibility and 73 23 EEC Low Voltage as amended by 93 68 EEC CE Marking However electrical noise or intense electromagnetic fields in the vicinity of the equipment may disturb the measurement circuit Measuring instruments will also respond to unwanted signals that
6. may be present within the measurement circuit Users should exercise care and take appropriate precautions to avoid misleading results when making measurements in the presence of electronic interference The meter all versions is protected against the users by double insulation per CSA C22 2 No 1010 1 92 EN61010 1 1995 and IEC61010 1 1995 to CAT II 1000V amp CAT III 600V Protection reinforced CE version Terminals to COM ratings V Category II 1000 Volts AC amp DC and Category III 600 Volts AC amp DC A MAHA Category III 500 Volts AC and 300 Volts DC PER IEC61010 OVERVOLTAGE INSTALLATION CATEGORY OVERVOLTAGE CATEGORY II Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed installation Note Examples include household office and laboratory appliances OVERVOLTAGE CATEGORY III Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations Note Examples include switches in the fixed installation and some equipment for industrial use with permanent connection to the fixed installation Electrical Specifications Accuracy is reading digits number of digits or otherwise specified at 23 C 5 C amp less than 75 R H Models AM 270 True RMS accuracy of ACV amp ACA is specified from 5 10 for AC400 0mV range to 100 of range or otherwise specified Maximum Crest Factor lt 1 75 1 at full scale amp lt 3 5 1 at half scale and with f
7. shcscctecasesadhisssasieeesceszedeesinnadevaasassdues Beep Jack Input VWarming Temperature Tunctlon ss Relative zero mode Backlighted display Manual or AUto ranging is Sleep Mode am EENEG SPECIFICATION ees atin net en te re EE MAINTENANCE AND REPAIR Trouble SHOOUNG DEE Battery replacement iii FUSE E sn RS APEE SSS ee ant SYMBOLS Battery El Double Insulated Alternating Current Refer to the manual Dangerous Voltage Earth Ground Direct Current Fuse Conform to relevant CE Complies with EU directives Australiantandard oi lc Si Do not dispose of this Underwriters x product as unsorted JC Laboratories municipal waste Note Canadian and US ll Audible tone L Warning and Percautions e Do not operate the meter in explosive gas material combustible gas material steam or filled with dust To reduce the risk of fire or electric shock do not expose this product to rain or moisture e To avoid electrical shock hazard observe the proper safety precautions when working with voltages above 60 VDC or 30 VAC rms These voltage levels pose a potential shock hazard to the user e Do not touch test lead tips or the circuit being tested while power is applied to the circuit being measured Keep your fingers behind the finger guards o
8. A AMPROBE AM 250 Digital Multimeter Users Manual e Mode d emploi e Bedienungshandbuch e Manual d Uso e Manual de uso AAMPROBE AM 250 Digital Multimeter Users Manual June 2010 Rev 2 2010 Amprobe Test Tools All rights reserved Printed in Taiwan Limited Warranty and Limitation of Liability Your Amprobe product will be free from defects in material and workmanship for 1 year from the date of purchase This warranty does not cover fuses disposable batteries or damage from accident neglect misuse alteration contamination or abnormal conditions of operation or handling Resellers are not authorized to extend any other warranty on Amprobe s behalf To obtain service during the warranty period return the product with proof of purchase to an authorized Amprobe Test Tools Service Center or to an Amprobe dealer or distributor See Repair Section for details THIS WARRANTY IS YOUR ONLY REMEDY ALL OTHER WARRANTIES WHETHER EXPRESS IMPLIED OR STAUTORY INCLUDING IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY ARE HEREBY DISCLAIMED MANUFACTURER SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES ARISING FROM ANY CAUSE OR THEORY Since some states or countries do not allow the exclusion or limitation of an implied warranty or of incidental or consequential damages this limitation of liability may not apply to you Repair All test tools return
9. LIMITED WARRANTY section for obtaining warranty or repairing service Battery and Fuse replacement Battery use Standard 1 5V AAA Size NEDA 24G or IEC R03 battery X 2 Fuse FS1 for pA and mA current input 0 63A 500V IR 150kA F fuse FA 6x32 63 Fuse FS2 for A current input 12 5A 500V IR 20kA F fuse FA 12 5A 500V Battery replacement Loosen the 2 screws from the battery access door of the case bottom Lift the battery access door and thus the battery compartment up Replace the battery Re fasten the screws Fuse replacement Loosen the 4 screws from the case bottom Lift the end of the case bottom nearest the input jacks until it unsnaps from the case top Replace the blown fuse s and or the battery Replace the case bottom and ensure that all the gaskets are properly seated and the two snaps on the case top near the LCD side are engaged Re fasten the screws Visit www Amprobe com for e Catalog e Application notes e Product specifications e User manuals amp Please Recycle
10. ake up the meter from sleep mode press any buttons momentarily or turn the rotary switch to an adjacent position Always set the rotary switch to the OFF position manually when the meter is not in use SPECIFICATIONS General Specifications Display 3 3 4 digits 4000 counts LCD display Polarity Automatic Update Rate 3 per second nominal Operating Temperature 0 C to 40 C 32 to 104 F Relative Humidity Maximum relative humidity 80 for temperature up to 31 C 88 F decreasing linearly to 50 relative humidity at 40 C 104 F Altitude Operating below 2000m Pollution degree 2 Storage Temperature 20 C to 60 C 4 F to 140 F lt 80 RH with battery removed Temperature Coefficient nominal 0 15 x specified accuracy C 0 C 18 C or 28 C 40 C or otherwise specified Sensing Average sensing for AM 250 Compliance The meter all versions is protected against the users by double insulation per CSA C22 2 No 1010 1 92 EN61010 1 1995 and IEC61010 1 1995 to CAT II 1000V amp CAT III 600V Protection reinforced CE Terminals to COM ratings V Category II 1000 Volts AC amp DC and Category III 600 Volts AC amp DC A mA and pA Category III 500 Volts AC and 300 Volts DC EMC Meets EN61326 1 2006 EN55022 EN61000 3 2 EN61000 3 3 EN61000 4 2 EN61000 4 3 EN61000 4 4 EN61000 4 5 EN61000 4 6 EN61000 4 8 EN61000 4 11 In an RF field of 3V m Capacitance function is not specified
11. ectronic measuring instrument that combines several measurement functions in one unit AM 250 multimeter is a portable hand held device useful for basic fault finding and field service work or a bench instrument which can measure to a very high degree of accuracy It can be used to troubleshoot electrical problems in a wide array of industrial and household devices such as batteries motor controls appliances power supplies and wiring systems OPERATION DC Voltage AC Voltage amp Hz Frequency functions Note 1 AC 400 0mV range selection is by RANGE button manually and is specified from AC 10mV and up 2 DC 400 0mV range is designed with 1000MQ high input impedance for least current drain in measuring small signals and can cope better with most commercially available voltage output transducers and adapters The non zero display reading is normal when the meter inputs are open circuit which will not affect actual measurement accuracy Open input is actually a floating condition which is not a zero volt input condition The meter will show zero or close to zero reading when the inputs are shorted O Resistance and Continuity functions Defaults at Q Press SELECT button momentarily to select sl Continuity function which is convenient for checking wiring connections and operation of switches A continuous beep tone indicates a complete wire Ga Temp MAUA COM AVA
12. ed for warranty or non warranty repair or for calibration should be accompanied by the following your name company s name address telephone number and proof of purchase Additionally please include a brief description of the problem or the service requested and include the test leads with the meter Non warranty repair or replacement charges should be remitted in the form of a check a money order credit card with expiration date or a purchase order made payable to Amprobe Test Tools In Warranty Repairs and Replacement All Countries Please read the warranty statement and check your battery before requesting repair During the warranty period any defective test tool can be returned to your Amprobe Test Tools distributor for an exchange for the same or like product Please check the Where to Buy section on www amprobe com for a list of distributors near you Additionally in the United States and Canada In Warranty repair and replacement units can also be sent to a Amprobe Test Tools Service Center see next page for address Non Warranty Repairs and Replacement US and Canada Non warranty repairs in the United States and Canada should be sent to a Amprobe Test Tools Service Center Call Amprobe Test Tools or inquire at your point of purchase for current repair and replacement rates In USA In Canada Amprobe Test Tools Amprobe Test Tools Everett WA 98203 Mississauga ON L4Z 1X9 Tel 888 993 5853 Tel 905 890 7600
13. f the test leads during measurement e Inspect test leads connectors and probes for damaged insulation or exposed metal before using the instrument e If any defects are found replace them immediately e Do not measure any current that exceeds the current rating of the protection fuse e Do not attempt a current measurement to any circuit where the open circuit voltage is above the protection fuse voltage rating S e uspected open circuit voltage should be checked with voltage functions Never attempt a voltage measurement with the test lead inserted into the yA mA or A input jack e Only replace the blown fuse with the proper rating as specified in this manual Disconnect the test leads from the test points before changing functions Always set the instrument to the highest range and work downward for an unknown value when using manual ranging mode e To avoid electrical shock disconnect the meter from any circuit remove the test leads from the input jacks and turn OFF the meter before opening the case Do not operate with open case 1 UNPACKING AND INSPECTION Your shipping carton should include 1 AM 250 2 Test Leads 2 Battery SIZE AAA 1 5V 1 User s Manual If any of the items are damaged or missing return the complete package to the place of purchase for an exchange INTRODUCTION Multimeter AM 250 can be used to measure voltage resistance capacitance frequency current and temperature It is an el
14. ged through an appropriate resistance load HA mA and A Current functions Default at DC Press SELECT button momentarily to select AC mA A SELECT r HOOO PTEE SAMATA tamp i A g lt lt D D Ca A Tmp mana n aver el el ACaution When measuring a 3 phase system special attention should be taken to the phase to phase voltage which is significantly higher than the phase to earth voltage To avoid exceeding the voltage rating of the protection fuse s accidentally always consider the phase to phase voltage as the working voltage for the protection fuse s Beep Jack Input Warning The meter beeps to warn the user against possible damage to the meter due to improper connections to the pA mA or A input jacks when other function like voltage function is selected Temperature function Be sure to insert the banana plug type K temperature bead probe Bkp60 Optional purchase with correct polarities Defaults at degree C Celsius Press SELECT button momentarily to select degree F Fahrenheit You can also use a plug adapter Optional purchase with banana pins to type K socket to adapt other type K standard mini plug temperature probes refer to www amprobe com
15. requency components within the specified frequency bandwidth for non sinusoidal waveforms DC Voltage Range Accuracy 400 0 mV 0 3 4d 4 000V 40 00V 400 0V 0 5 3d 1000V 1 0 4d NMRR gt 50dB 50 60Hz CMRR gt 120dB DC 50 60Hz Rs 1kO Input Impedance 10M0 30pF nominal 1000MQ for 400 0mV range Type K Temperature Range Accuracy 20 C to 300 C 2 3 C 4 F to 572 F 2 6 F Type K thermocouple range amp accuracy not included AC Voltage Range Accuracy 50Hz 500Hz 400 0mV 4 0 5d 4 000V 40 00V 400 0V 1 5 5d 1000V 4 0 5d CMRR gt 60dB DC to 60Hz Rs 1kQ Input Impedance 10M0 30pF nominal Selection by Range button manually and is specified from AC 10mV AC 40mV for True RMS models AM 270 and up Max Hold Voltage amp Current Specified accuracy 50 digits for changes gt 25ms in duration DC Current Range Accuracy Burden Voltage 400 0uA 2 0 5d 0 15mV pA 4000pA 1 2 3d 0 15mV pA 40 00mA 2 0 5d 3 3mV mA 400 0mA 1 2 3d 3 3mV mA 4 000A 2 0 5d 0 03V A 10 00A 1 2 3d 0 03V A 10A continuous 20A for 30 second max with 5 minutes cool down interval AC Current Range Accuracy Burden Voltage 50Hz 500Hz 400 0uA 2 0 6d 0 15mV pA 4000UA 1 5 4d 0 15mV pA 40 00mA 2 0 6d 3 3mV mA 400 0mA 1 7 4d 3 3mV mA 4 000A 2 0 6d 0 03V A
16. steps should be performed in order to isolate the cause of the problem 1 Check the battery Replace the battery immediately when the EH symbol appears on the LCD 2 Review the operating instructions for possible mistakes in operating procedure Except for the replacement of the battery repair of the meter should be performed only by a Factory Authorized Service Center or by other qualified instrument service personnel The front panel and case can be cleaned with a mild solution of detergent and water Apply sparingly with a soft cloth and allow to dry completely before using Do not use aromatic hydrocarbons or chlorinated solvents for cleaning If the meter is not to be used for periods of longer than 60 days remove the batteries and store them separately Trouble Shooting If the instrument fails to operate check batteries and test leads etc and replace as necessary Double check operating procedure as described in this user s manual If the instrument voltage resistance input terminal has subjected to high voltage transient caused by lightning or switching surge to the system by accident or abnormal conditions of operation the series fusible resistors will be blown off become high impedance like fuses to protect the user and the instrument Most measuring functions through this terminal will then be open circuit The series fusible resistors and the spark gaps should then be replaced by qualified technician Refer to the
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