Tektronix TCPA300 SERIES, Instruction Manual

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Getting Started
TCPA300/400 Amplifiers and TCP300/400 Series Current Probes Instruction Manual
1- 13
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.
6. Open the probe slide, place the probe around the conductor under test, and
then lock the slide. For correct measurement polarity, make sure the probe
arrow is pointing in the direction of conventional (positive to negative)
current flow. Reversing the flow will display the current waveform upside-
down on the oscilloscope.
7. Adjust the oscilloscope time base, trigger, and gain as needed.
Figure 1--7 shows a current probe connected to a power supply line. Notice that
the probe arrow points toward the negative terminal of the power supply to
conform to the conventional current flow of positive (+) to negative (--).
Power supply
Conventional current arrow
Load
Current probe
Figure 1- 7: Current probe polarity