Amprobe 38XR-A, User Manual, Page: 14 / 112

8
Preparing for Current Measurements
• Turn off circuit power before connecting the Test Probes.
• Allow the meter to cool between measurements, if
current measurements approach or exceeds 10 amps.
• A warning tone sounds if you connect a test lead to a
current input while a current function is not selected.
• Open circuit voltage at the measurement point must
not exceed 1000 V.
• Always measure current in series with the load. Never
measure current across a voltage source.
Measuring DC Current
1. Set the Function Switch to a current function, μA , mA , or 10A .
2. If AC or AC+DC is displayed, press the yellow button to
turn on DC .
3. If the μA function is selected and RANGE is displayed,
press the RANGE button to enable autoranging.
4. Connect the Test Leads: Red to mA or 10A , Black to COM .
5. Turn off power to the circuit being measured.
6. Open the test circuit (
X
) to establish measurement
points.
7. Connect the Test Probes in series with the load (to the
measurement points).
8. Turn on power to the circuit being measured.
9. Read the display, and, if necessary, correct any
overload (
0o
or -
0o
) conditions.
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38XR-A
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