Tektronix TCP300 Series, User Manual, Page: 30 / 80

Getting Started
DC Measurements
To measure DC current, fi rst degauss the probe:
1. Verify that the ampli fi er 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 ampli fi er 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 necessary) using the ampli
fi er MANUAL BALANCE controls.
WARNING. Do not clamp the TCP305 or TCP312 current probes around
uninsulated wires. Damage to the probe or personal injury may result. Only use
the TCP305 or TCP312 current probes on INSULATED wires.
The TCP303 and TCP404XL 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.
12 TCPA300/400 Ampli fi ers and TCP300/400 Series Current Probes User Manual