Instructions / Assembly

Page 22
Calibration Procedure
Recalibrate your meter:
It is recommended that the multimeter be calibrated once each year.
1. Perform calibration at an ambient temperature of 23°C±2°C and a relative humidity of <70%.
2. Disconnect the test leads and turn the meter off. Remove the test leads from the front terminals.
3. Position the meter face down. Remove the battery cover screw and the 2 bottom case cover screws.
4. Lift the end of the bottom case cover until it gently unsnaps from the case top at the end nearest the
LCD.
(A) DC V Calibration (Adjust VR1)
1. Set the rotary switch to the
position for the DC Volts function.
2. Set the output of the calibrator for 300.0mV and connect to the
and COM inputs on meter.
3. Using a small flat-tipped screwdriver, adjust VR1 until the display reads 299.5 to 300.5mV.
4. Disconnect the calibrator from the meter.
(B) AC V Calibration (Adjust VR2)
Model 61-340:
1. Set the rotary switch to the
position for the AC Volts function.
2. Set the output of the calibrator for 3.000V at 60Hz and connect to the
and COM inputs on
meter.
3. Using a small flat-tipped screwdriver, adjust VR2 until the display reads 2.995 to 3.005Volts.
4. Disconnect the calibrator from the meter.
Model 61-342:
1. Set the rotary switch to the
position. Press the SELECT button to select AC A function, then
press RANGE button to select the 10A range .
2. Using a small flat-tipped screwdriver, adjust VR4 until the display reads 0 to 3 digits.
3. Press RANGE button to select the 4A range and adjust VR5 until the display reads same as the
digits at the AC 10A range (0 to 3 digits).
4. Set the rotary switch to the
position for the AC Volts Function.
5. Set the output of the calibrator for 3.000V at 60Hz. and connect to the
and COM input terminals
on meter.
6. Using a small flat-tipped screwdriver, adjust VR2 until the display reads 2.995 to 3.005Volts
7. Disconnect the calibrator from the meter.
Form Number TM61340-2 Rev 3 January 2008