User’s Guide MiniAmp™ Series Clamp-on Multimeters Models: MA400 MA420 MA440 MA460+
WARRANTY EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies on sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization. A Return Authorization (RA) number must be issued before any product is returned to Extech.
Introduction Congratulations on your purchase of Extech model MA400, MA420, MA440 or MA460+ clamp-on multimeter. Properly used, this meter will provide many years of reliable service. Clamp meter functions common to all meters: Autoranging AC Current Measurements Data Hold Auto Power Off Maximum Hold captures 30ms peaks 1.
Safety Precautions 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Improper use of this meter can cause damage, shock, injury or death. Read and understand this users manual before operating the meter. Make sure any covers or battery doors are properly closed and secured. Always remove the test leads before replacing the battery or fuses. Inspect the condition of the test leads and the meter itself for any damage before operating the meter. Repair or replace any damage before use.
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY OVERVOLTAGE CATEGORY I Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which measures are taken to limit the transient overvoltages to an appropriate low level. Note – Examples include protected electronic circuits. OVERVOLTAGE CATEGORY II Equipment of OVERVOLTAGE CATEGORY II is energyconsuming equipment to be supplied from the fixed installation. Note – Examples include household, office, and laboratory appliances.
Specifications DC Voltage RANGE Accuracy 400.0mV 0.3% + 4d 4.000V, 40.00V, 400.0V 0.5% + 3d 600V 1.0% + 4d NMRR: >50dB @ 50/60Hz, CMRR: >120dB @ DC, 50/60Hz, Rs=1kΩ Input impedance: 10MΩ, 30pF nominal, 1000MΩ on the 400.0mV range. AC Voltage RANGE (50Hz to 500Hz) 4.000V, 40.00V, 400.0V 600V Accuracy 1.5% + 5d 2.0% + 5d CMRR: >60dB @ DC to 60Hz, Rs=1kΩ, Input Impedance: 10MΩ, 30pF nominal, True RMS models specified from 5% to 100% of range AC Current (Clamp-on) RANGE (50/60Hz) Accuracy 40.00A 1.
Capacitance RANGE Accuracy* 500.0nF, 5.000µF, 50.00µF, 500.0µF, 3.5%* + 6d 3000µF 50.00nF Not specified *Accuracies with a 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. Frequency Function Sensitivity Range (ACrms) 400.0mV 150mV 10Hz to 2kHz 4.000V 3.2V 5Hz to 40kHz 40.00V 25V 5Hz to 100kHz 400.
Accuracy Notes: Accuracy is ± (% reading digits + number of digits), or as otherwise specified, at 23°C ±5°C < 75% R.H. Model MA420 True RMS accuracies are specified from 10% to 100% of range or as otherwise specified. Maximum Crest Factor <1.75:1 at full scale & <3.5:1 at half scale (with frequency component within the specified frequency bandwidth for non-sinusoidal waveforms). Audible Continuity: Threshold between 10Ω and 120Ω. Response time < 100µs Diode Test: Open circuit voltage < 1.
Safety: E.M.C.: Overload Protection: Power Supply Power Consumption: The MiniAmp™ Series meters meet IEC61010-032(1994), EN61010-2032(1995), UL3111-2-032(1999). MA440 and MA460+: Category III 600V AC & DC MA400 and MA420: Category II 600V AC & DC and Category III 300V AC & DC Meets EN61326(1997, 1998/A1), EN61000-4-2(1995), and EN61000-43(1996) In an RF field of 1V/m: Capacitance function is not specified µA function: Total accuracy = Acc.+50 digits Other functions: Total acc.
Meter Description MA440 and MA460+ (double display models) 1. Clamp jaw 2. Jaw trigger 3. ACA LCD display 4. Multimeter LCD display 5. Select button 6. Multimeter function switch 7. Multimeter input jacks 8. Hz button 9. Clamp power button 1 10 2 10. Data Hold/Max Hold button 9 3 4 5 6 8 7 MA400 and MA420 (single display models) 1. Clamp jaw 2. Jaw trigger 3. LCD display 4. Select button 5. Multimeter function switch 6. Multimeter input jacks 7. Hz button 8.
Operation NOTICE: Read and understand all warning and caution statements listed in the safety section of this operation manual prior to using this meter. AC/DC Voltage Measurements 1. Connections are made through the test lead terminals. 2. Insert the black test lead into the negative COM jack and jack. the red test lead into the positive 3. Slide the function switch to the "V" position. Press the SELECT key momentarily to toggle between ACV and DCV. 4. Read the voltage measurement on the display.
Resistance and Continuity Measurements 1. Insert the black test lead banana plug into the negative COM jack and the red test lead banana plug into the jack. 2. Slide the function switch to the "Ω •)))" position. 3. Press the SELECT key momentarily to select Continuity. 4. Touch the test probe tips across the circuit or part under test. It is best to disconnect one side of the part under test so the rest of the circuit will not interfere with the resistance reading. 5.
electrical noise that may produce an unstable reading. However, if the HZ reading displays zero due to insufficient sensitivity, activate the HZ function before measuring the signal to select the highest Hz sensitivity. Diode Test 1. Insert the black lead into the negative COM jack and the red test lead into the positive jack 2. Slide the function switch to " " position. 3. Press the SELECT key twice until “ “ and “V” appear in the display. 4.
Max Hold 1. Press and hold for 1 second the Max Hold key to capture and hold the maximum measured value (up to 30ms). The annunciators “H MAX” will appear in the display 2. Press and hold for 1 second the Max Hold key to exit the mode. Note: The Max Hold feature applies only to the upper current display (ACA) on the MA440 and MA460+ double display models. It applies to the ACA, DCV and ACV functions on the single display MA400 and MA420 models. Relative (MA400 and MA420 only) 1.
Maintenance WARNING 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. Cleaning and Storage Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or solvents. If the meter is not to be used for periods of longer than 60 days, remove the battery and store it separately Battery replacement 1.
