Amprobe AM-250 User Manual Download Page 6

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CONTENTS

SYMBOLS

...............................................................................................................1

UNPACKING AND INSPECTION

.............................................................................2

INTRODUCTION

.....................................................................................................2

OPERATION

............................................................................................................2

Resistance, and Continuity functions ...........................................................3

Diode test,Capacitance functions ....................................................................4

µA, mA, and A Current functions ...................................................................5

Beep-Jack™ Input Warning ..............................................................................5

Temperature function .......................................................................................6

Relative zero mode ..........................................................................................6

Backlighted display ...........................................................................................6

Manual or Auto-ranging ..................................................................................7

HOLD .................................................................................................................7

MAX ...................................................................................................................7

Sleep Mode .......................................................................................................7

SPECIFICATION

.......................................................................................................7

MAINTENANCE AND REPAIR

................................................................................13

Trouble shooting ...............................................................................................13

Battery replacement .........................................................................................14

Fuse replacement .............................................................................................14

Summary of Contents for AM-250

Page 1: ...1 Users Manual Mode d emploi Bedienungshandbuch Manual d Uso Manual de uso AM 250 Digital Multimeter ...

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Page 4: ...er 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 Am...

Page 5: ...ctions features 3 Selector to turn the Power On or Off and select a function 4 Input Jack for 10A 20A for 30sec current function 5 Input Jack for all functions EXCEPT current µA mA A function 6 Common Ground reference Input Jack for all functions 7 Input Jack for milli amp and micro amp functions ...

Page 6: ...Diode test Capacitance functions 4 µA mA and A Current functions 5 Beep Jack Input Warning 5 Temperature function 6 Relative zero mode 6 Backlighted display 6 Manual or Auto ranging 7 HOLD 7 MAX 7 Sleep Mode 7 SPECIFICATION 7 MAINTENANCE AND REPAIR 13 Trouble shooting 13 Battery replacement 14 Fuse replacement 14 ...

Page 7: ...ingers behind the finger guards of the test leads during measurement Inspect test leads connectors and probes for damaged insulation or exposed metal before using the instrument If any defects are found replace them immediately Do not measure any current that exceeds the current rating of the protection fuse Do not attempt a current measurement to any circuit where the open circuit voltage is abov...

Page 8: ...current and temperature It is an electronic 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...

Page 9: ...ro 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 e Resistance and Continuity functions Defaults at e Press SELECT button momentarily to select Continuity function which...

Page 10: ...display shows OL if the diode is good Any other readings indicate the diode is resistive or shorted defective Defaults at e Press SELECT button momentarily 3 times to select Capacitance function Relative zero 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 Caution Usi...

Page 11: ...is selected Caution Discharge capacitors before making any measurement Large value capacitors should be discharged through an appropriate resistance load Caution 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 alwa...

Page 12: ...other type K standard mini plug temperature probes refer to www amprobe com Relative zero mode Relative zero 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 button momentarily to activate or to exit relative ze...

Page 13: ...vate 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 wake 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 th...

Page 14: ...3V m Capacitance function is not specified AC 4 000V range Total Accuracy Specified Accuracy 700 digits AC 400 0µA 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 µA mA 0 63A 500V IR200kA F Fuse A 12 5A 500V IR20kA F Fuse V 1050Vrms 1450Vpeak e Others 600VDC VAC rms Tra...

Page 15: ...ipment 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 less than 75 R H Models AM 270 True RMS accuracy of ACV ACA is specified from 5 10 for AC400 0mV range to 100 of range or otherwise specified Maximum Crest Factor 1 75 1 at full scale 3 5 1 at half scale and with freq...

Page 16: ...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 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 60dB DC to 60Hz Rs 1ke Input Impedance 10Me 30pF nominal Selection by Range button manually and is specified from AC 10mV AC 40mV for True RMS models AM 270 and up ...

Page 17: ...nd max with 5 minutes cool down interval AC Current Range Accuracy Burden Voltage 50Hz 500Hz 400 0µA 2 0 6d 0 15mV µA 4000µA 1 5 4d 0 15mV µA 40 00mA 2 0 6d 3 3mV mA 400 0mA 1 7 4d 3 3mV mA 4 000A 2 0 6d 0 03V A 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 0e 0 8 6d 4 000ke 40 00ke 400 0ke 0 6 4d 4 000Me 1 0 4d 40 00Me 2 0 4d ...

Page 18: ...arning voltage of approximately 2 4V Hz Frequency Range Accuracy 50 00Hz 500 0Hz 5 000kHz 50 00kHz 500 0kHz 1 000MHz 0 5 4d Additional 5 000Hz range accuracy sensitivity are not specified Accuracy is specified at 20VAC rms Input Signal Square wave with duty cycle 40 70 or Sine wave Vrms AC Sensitivity 10Hz 20Hz Sine 0 9Vrms 20Hz 500kHz 2 6Vp or Sine 1 9Vrms 500kHz 1MHz 4 2Vp or Sine 3Vrms Update R...

Page 19: ...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 ...

Page 20: ...y 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 ...

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Page 23: ...1 Users Manual Mode d emploi Bedienungshandbuch Manual d Uso Manual de uso AM 270 Industrial Multimeter with Bar graph Display ...

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Page 26: ...er 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 Am...

Page 27: ...cial functions features 3 Selector to turn the Power On or Off and select a function 4 Input Jack for 10A 20A for 30sec current function 5 Input Jack for all functions EXCEPT current µA mA A functions 6 Common Ground reference Input Jack for all functions 7 Input Jack for milli amp and micro amp current functions ...

Page 28: ... A Current Functions 9 PC COMM Computer Interface Capabilities 10 50ms MAX MIN at Fast 20 s Measurement Mode 10 0 8ms CREST Capture Mode 10 Backlighted Displaye 11 Hold 11 Zoom 5x Analog Pointer 11 Relative Mode 12 Manual or Auto Ranging 12 Beep Jack Input Warning 13 Set Beeper Off 13 Auto Power Off APO 13 Disabling Auto Power Off 13 SPECIFICATION 13 MAINTENANCE AND REPAIR 19 Trouble Shooting 19 C...

Page 29: ...tion and warnings that must be followed for operating the instrument safely and maintaining the instrument in a safe operating condition If the instrument is used in a manner not specified by the manufacturer the protection provided by the instrument may be impaired The meter is intended only for indoor use The meter protection rating against the users is double insulation per IEC61010 1 2nd Ed EN...

Page 30: ...ions when working with voltages above 60 VDC or 30 VAC rms These voltage levels pose a potential shock hazard to the user 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 of the test leads during measurement Inspect test leads connectors and probes for damaged insulation or exposed metal before u...

Page 31: ...librated RMS Root Mean Square is the term used to describe the effective or equivalent DC value of an AC signal Most digital multimeters use average sensing RMS calibrated technique to measure RMS values of AC signals This technique is to obtain the average value by rectifying and filtering the AC signal The average value is then scaled upward calibrated to read the RMS value of a sine wave In mea...

Page 32: ...cation of 60dB at 50 and 60Hz which is a good and definite ability to reject the effect of AC noise when making DC measurements CMRR Common Mode Rejection Ratio Common mode voltage is voltage present on both the COM and VOLTAGE input terminals of a DMM with respect to ground CMRR is the DMM s ability to reject common mode voltage effect that can cause digit rolling or offset in voltage measurement...

Page 33: ...tomatically set the most appropriate trigger level You can also press the RANGE button momentarily to select another trigger level manually If the Hz reading becomes unstable select lower sensitivity to avoid electrical noise If the reading shows zero select higher sensitivity Capacitance Diode Test Function Default at Press SELECT button momentarily to select Diode test function CAUTION Discharge...

Page 34: ...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 Temperature Function Press SELECT button momentarily to toggle between C and F readings and the new setting will be saved automatically in the non volatile memory as power...

Page 35: ...7 Note Be sure to insert the banana plug K type temperature bead probe Bkp60 with correct polarities ...

Page 36: ... disconnected from the circuit to obtain an accurate reading Auto Leads Resistance Calibration When entering the 50 range manually by RANGE button for high precision low resistance measurement this feature will prompt you to short the inputs for calibration The display shows Shrt Simply short the leads for about 3 seconds until the display shows zero then the resistance in the leads and in the int...

Page 37: ...l you change ranges functions or go back to auto ranging mode µA mA and A Current Functions Default at DC Press SELECT button momentarily to select AC Note 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 con...

Page 38: ...er beeps when new maximum or minimum reading is updated Press the button momentarily to read throughout the Maximum MAX Minimum MIN and Maximum minus Minimum MAX MIN readings Press the button for 1 second or more to exit MAX MIN mode Auto Power Off feature will be disabled automatically in this mode 0 8ms CREST Capture Mode Press CREST button momentarily to activate CREST Instantaneous Peak Hold m...

Page 39: ...battery life Hold The hold function freezes the display for later view Press the HOLD button momentarily to activate or to exit the hold function Zoom 5x Analog Pointer The Zoom mode analog pointer magnifies up to 5 times the regular analog bar graph resolution to show minute signal changes with a single analog pointer It is virtually equivalent to the bar graph resolution of 5 X 50 250 segments ...

Page 40: ...ature readings Press the button momentarily to activate and to exit relative zero mode Manual or Auto Ranging Press the RANGE button momentarily to select manual ranging and the meter will remain in the range it was in the LCD annunciator 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 Note Manual ranging...

Page 41: ...ing readings of above 10 of range or non OL readings That is the meter will intelligently avoid entering the APO mode when it is under normal measurements To wake up the meter from APO press the SELECT button momentarily or turn the rotary switch to the OFF position and then turn back on again Always turn the rotary switch to the OFF position when the meter is not in use Disabling Auto Power Off P...

Page 42: ... 10kA or better F fuse A 10A 600V IR 100kA or better F fuse V 1050VRMS 1450VPEAK mV others 600 VDC VAC RMS TERMINALS TO COM MEASUREMENT CATEGORY V CATEGORY III 1000V AC DC AND CATEGORY IV 600V AC DC A mAµA CATEGORY III AND CATEGORY IV 600 VAC AND 300 VDC TRANSIENT PROTECTION 8KV 1 2 50µS SURGE E M C Meets en61326 1 2006 EN55022 EN61000 3 2 EN61000 3 3 EN61000 4 2 EN61000 4 3 EN61000 4 4 EN61000 4 ...

Page 43: ...e specified maximum crest factor 3 1 at full scale 6 1 at half scale and with frequency spectrums besides fundamentals fall within the meter specified AC bandwidth for non sinusoidal waveforms DC Voltage RANGE ACCURACY 50 00 MV 0 12 2D 500 0 MV 0 06 2D 5 000V 50 00V 500 0V 1000V 0 08 2D NMRR 60DB 50 60HZ CMRR 120DB DC 50 60HZ RS 1K Input Impedance 10M 16pF nominal 44pF nominal for 50mV 500mV range...

Page 44: ...V 500mV ranges DC Current RANGE ACCURACY BURDEN VOLTAGE 500 0µA 0 2 4D 0 15MV µA 5000µA 0 15MV µA 50 00MA 3 3MV MA 500 0MA 3 3MV MA 5 000A 45MV A 10 00A 45MV A 10a continuous 10a to 15a to 20a for cf version for 30 second max with 5 minutes cool down interval AC Current RANGE ACCURACY BURDEN VOLTAGE 50HZ 60HZ 500 0µA 0 6 3D 0 15MV µA 5000µA 0 15MV µA 50 00MA 3 3MV MA 500 0MA 1 0 3D 3 3MV MA ...

Page 45: ...5a to 20a for cf version for 30 second max with 5 minutes cool down interval Ohms RANGE ACCURACY 50 00 0 3 6D 500 0 0 1 3D 5 000K 50 00K 500 0K 0 1 2D 5 000M 0 4 3D 50 00M 2 0 5D open circuit voltage 1 3vdc 3vdc for 50 500 ranges Audible Continuity Tester Audible threshold between 20 and 200 response time 100µS Crest Mode for V A functions Accuracy specified accuracy 150 digits for changes 0 8 ms ...

Page 46: ...Z 125KHZ Accuracy 0 01 2D Diode Tester RANGE ACCURACY TEST CURRENT TYPICAL OPEN CIRCUIT VOLTAGE 2 000V 1 1D 0 4MA 3 5 VDC Capacitance RANGE ACCURACY 50 00nF 0 8 3D 500 0nF 0 8 3D 5 000µF 1 5 3D 50 00µF 2 5 3D 500 0µF 3 5 5D 9999µF 5 0 5D Accuracies with film capacitor or better In manual ranging mode measurements not specified below 45 0µF and 450µF for 500 0µF and 9999µF ranges respectively ...

Page 47: ...being displayed while powering on some meter ranges might be largely out of specifications To avoid mis leading measurements stop using the meter and send it for re calibration Refer to the LIMITED WARRANTY section for obtaining warranty or repairing service Trouble Shooting If the instrument fails to operate check battery fuses leads etc and replace as necessary Double check operating procedure a...

Page 48: ...t 10A 600V IR 100kA or better F fuse Battery replacement for models with battery access door 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 fr...

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