User’s Guide 400A AC/DC Clamp Meter Model MA220
Introduction Thank you for selecting the Extech MA220 AC/DC Clamp Meter. This meter measures AC/DC Current, AC/DC Voltage, Resistance, Capacitance, Frequency, Duty Cycle, Temperature, Diode Test, and Continuity. This professional meter, with proper care, will provide years of safe reliable service. Safety International Safety Symbols This symbol, adjacent to another symbol or terminal, indicates the user must refer to the manual for further information.
Meter Description 1. Conductor jaws 2. Jaw opening trigger 3. Function select switch 4. LCD Display 5. ZERO button 6. Data Hold and Backlight Button 7. Mode select button 8. Range select button 9. Hz/%/Duty Cycle button 10. COM input jack 11. V/Temp jack 12.
Operation Notice: Read and understand all WARNING and CAUTION statements listed in the safety section of this operation manual prior to using this meter. Set the function select switch to the OFF position when the meter is not in use. DC/AC Current Measurements Warning: Disconnect the test leads from the meter before making current clamp measurements. 1. 2. 3. 4. Set the Function switch to the 400ADC, 40ADC, 400AAC or 40AAC range.
Diode Test 1. Turn the rotary switch to the •))) CAP position. 2. Insert the black test lead banana plug into the negative (COM) jack and the red test lead banana plug into the positive (V jack. 3. Push the mode button to indicate on the display. 4. Touch the test probes to the diode under test. Typically for a normal diode, forward voltage will indicate 0.4V to 0.7V. Reverse voltage will indicate “OL”. Shorted devices will indicate near 0V and an open device will indicate “OL” in both polarities.
Data Hold To freeze the LCD meter reading, press the HOLD button. While data hold is active, the HOLD display icon appears on the LCD. Press the HOLD button again to return to normal operation. Backlight Press and hold the HOLD button for >2 seconds to turn the backlight on/off. Note: The HOLD feature will activate when the backlight is turned on. Press the HOLD button again to exit the Hold feature. Zero Button Zeros Capacitance and DC Current measurements.
Specifications Function Range DC Current 40.00 ADC 0-20.00 ADC 20.00-40.00 ADC ± (3% + 6 digits) 400.0 ADC 0-300.0 ADC ± (2.5% + 6 digits) AC Current Accuracy (of reading) 40.00 AAC 400.0 AAC DC Voltage AC Voltage Resistance Capacitance Frequency Duty Cycle Temperature ± (2.5% + 6 digits) 300.0-400.0 ADC ± (3.5% + 6 digits) 0-20.00 AAC 20.00-40.00 AAC 0-300.0 AAC 300.0-400.0 AAC ± (3% + 10 digits) ± (5% + 10 digits) ± (3% + 10 digits) ± (5% + 10 digits) ± (0.8% + 3 digits) 400.0mV 4.
Jaw size 23mm (0.9") approx. Display Continuity 4000 count LCD Audible tone < 150 approx. Diode Test Open circuit voltage < 1.5VDC; AC V bandwidth 50Hz to 400Hz Test current 0.3mA (typical) AC A bandwidth 50/60Hz Low battery indication “ ” is displayed Overrange indication “OL” is displayed Auto Power OFF After 30 minutes Measurement rate 2 per second, nominal Input Impedance 7.
