Operate the current probe
Make DC curren
t measurements
To measure DC current, first degauss the probe. (See page 24, Degauss and
autobalance the current probe.)
1. Verify that the amplifier and the oscilloscope input coupling are set to DC,
and the input impedance is set to 50 Ω.
2. Lock the probe closed without a conductor passing through it.
3. Adjust the ground reference of the oscilloscope to move the trace to the
desired graticule line.
4. Press the amplifier PROBE DEGAUSS AUTOBALANCE button.
The NOT TERMINATED INTO 50 Ω LED is lighted if impedance is not
50 Ω. If this is the case, make necessary changes. (For example, use a 50 Ω
termination.)
5. After the degauss/autobalance routine completes, adjust the ground reference
(if necessa ry) using the amplifier MANUAL BALANCE controls.
WARNING. The current probes can be used to measure current on uninsulated
wires
. However, the circuit must be de-energized when connecting or removing
the current probe.
26 Amplifiers and Current Probes Compliance and Safety Instructions
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