Peak Max; Low Pass Filter Function; Low Impedance Voltage Measurements (Lo Z) - Extech Instruments EX623A User Manual

600 a true rms ac/dc clamp meter with ir thermometer

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Operation

5.8.2 Peak Max

When measuring AC voltage, press the PEAK button to activate the peak cap-

ture circuit. The P-MAX display icon will appear at the top of the LCD. The me-

ter will now display the measured signal's peak. Press the PEAK button again

to exit this mode.

When measuring AC voltage you can introduce a low pass filter into the meas-

urement circuit. This allows you to safely measure voltage on variable fre-

quency drives (VFD), and other such devices. Follow the steps above to set

up a test, and continue with the steps below.

1. When measuring AC voltage, long press the LPF button for 2 seconds to

activate the low pass filter. LPF will appear on the display.

2. The low pass filter is now active, read the voltage on the display.

3. Long press the LPF button for 2 seconds to exit.

Do not measure voltage if a motor on the circuit is being switched on or off. Large voltage

surges may occur that can damage the meter.

The low impedance mode is useful in applications where 'ghost' voltages are

a concern.

1. Set the function switch to the Lo Z position.

2. Insert the black test lead plug into the negative COM jack. Insert the red

test lead plug into the positive V jack.

3. Touch the black test probe tip to the negative side of the circuit. Touch the

red test probe tip to the positive side of the circuit.

4. Read the voltage in the display.

#NAS100174; r. AA/97578/97616; en-US

CAUTION

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