1-8
IM 701931-01E
1.
Check that the system is safe, and that the preparations described in the
preceding section have been carried out.
2.
Pull the sensor opening lever so that the sensor head opens.
3.
Align the sensor so that the current direction indication corresponds to
the direction of current flow through the conductor to be measured, and
clamp so that the conductor is in the center of the sensor aperture.
4.
Press the clamp lever on the sensor head until the
LOCK
indicator
appears (and the
UNLOCK
indication disappears), and check that the
opening lever is firmly locked and the clamp is securely closed.
5.
It is now possible to monitor the current waveform. The output voltage
rate of the 701931 is 0.01 V/A. Convert the voltage sensitivity of the
waveform observation instrument to current sensitivity. For example, if the
voltage sensitivity is 10 mV/DIV, the current sensitivity is 1 A/DIV.
Note
• The output of this unit is terminated internally. Use a waveform measurement
instrument with an input impedance of at least 1 MΩ.
• Immediately after powering on, this unit may be subject to an appreciable offset
drift due to the effect of self-heating. To counteract this, allow the unit to warm up
for about 30 minutes before carrying out measurement.
• When performing continuous measurements, 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 (Model 701934) while the power supply is ON. In such cases,
oscillation can be stopped and operation restored to normal by opening and
closing the clamp with the clamp lever.
• Depending on the measured current value or its frequency, resonant sounds
may be generated from the clamp. Unless there is dirt or foreign matter on the
matching surfaces of the sensor head, this will have no effect on measurement.
• 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 measurement, press the clamp lever until the
LOCK
indication
appears (and the
UNLOCK
indication disappears), and check that the clamp is
properly closed. If the clamp is not properly closed, accurate measurement will
not be possible.
