CP6000/CP4000
6 Current Probe Instructions
The output of this unit is terminated internally. Use an oscilloscope with an input
impedance of at least 1
MΩ.
Immediately after powering on the probe, the probe may be subject to an
appreciable offset drift due to the effect of self heating. To counteract this, allow
the probe to warm up for about 30 minutes before carrying out measurement.
When performing continuous measurements, it is necessary to be aware that
the offset voltage drifts, depending on factors such as the ambient temperature.
Under certain circumstances, oscillation may occur if the probe is connected to
the power supply while the power supply is on. This does not indicate a
malfunction. Oscillation can be stopped and operation restored to normal by
opening and closing the sensor head.
Depending on the measured current frequency, some sound maybe produced
by resonance, but has no effect on measurements.
The reading may be affected by the position within the clamp aperture of the
conductor being measured. The conductor should be in the center of the clamp
aperture.
When carrying out a measurement, press the opening lever until the UNLOCK
indication disappears and check that the sensor head is properly closed. If the
sensor head is not properly closed, an accurate measurement is not possible.
Accurate measurement may be impossible in locations subject to strong
external magnetic fields, such as transformers and high-current conductors, or
in locations subject to strong external electric fields, such as radio transmission
equipment.
At high frequencies, common mode noise may affect measurements taken on
the high voltage side of circuits. If this occurs, reduce the frequency range of the
waveform measuring instrument or clamp onto the low- voltage side of the circuit.
NOTE
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