MA220 Datasheet, PDF (8/9 Pages) Extech Instruments Corporation. – 400A AC/DC Clamp Meter

Temperature Measurements
1. Turn the rotary switch to the Temp position.
2. Insert the Temperature Probe into the negative (COM) and the (VΩTemp) jacks, making
sure to observe correct polarity.
3. Select °C or °F with the MODE button.
4. Touch the temperature probe head to the part whose temperature you wish to measure.
Keep the probe touching the part under test until the reading stabilizes.
5. Read the temperature on the display.
Warning: To avoid electrical shock, be sure the thermocouple has been removed before
changing to another measurement function.
Auto/Manual Ranging
The meter turns on in Autoranging mode. Press the RANGE button to enter manual
ranging. Each press of the range button will step to the next range as indicated by the units
and decimal point location. Press and hold the RANGE button for two seconds to return to
Autoranging mode.
Note: Manual ranging does not function in AC Current or Diode and Continuity check
functions. In Temperature function, it will change the resolution from 0.1° to 1°.
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. Also allows the user to offset the
meter by using the displayed value as the zero reference value. Press the ZERO key
momentarily to activate and to exit Zero mode.
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MA220 V1.3 10/06