Ac/Dc Voltage Measurements - Extech Instruments 38073A User Manual

AC/DC Voltage Measurements

CAUTION: Do not measure voltages higher than 300V. Damage
may occur to the meter.
1. Set the function switch to the correct AC/DC voltage range.
2. Insert the black test lead into the COM input and the red
test lead into the VmAΩ input.
3. For DC, touch the black test lead to the negative side of the
circuit under test and touch the red test lead to the positive
side. For AC, the test lead polarity is not a factor.
4. For DC only, if the pointer needle deflects to the left side of
the scale, reverse the test leads.
5. Use the chart below to read AC/DC voltage measurements.
ACV Range
N/A
10
50
250
300
DC mA Current Measurements
1. Set the function switch to the correct mA DC range.
2. Remove power to the circuit under test and open the circuit
at the point to be measured.
3. Insert black test lead into the COM input and red test lead
into the VmAΩ input.
4. Touch the black test lead to the negative side of the circuit
and the red test lead to the positive side.
5. Apply power to the circuit.
6. If the needle deflects to the left, reverse the test leads.
7. Use the chart below to read DC mA measurements.
DCmA Range Setting
10
250
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DCV Range Scale
2.5 0-250
10 0-10
50 0-50
250 0-250
300 0-300
Scale
0-10
0-250
5
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Multiply reading by
0.01
1
1
1
1
Multiply reading by
1
1
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