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Description of Parts
2
1. Open/Close Lever
This lever opens and closes the sensor head. Always use this lever when
opening and closing the sensor head.
2. Sensor Head
The sensor head clamp is positioned around the conductor under test to
detect current. It is a precision-assembled component consisting of various
parts including plastic molded parts, a ferrite core, and a Hall element. Take
proper care when handling the probe to avoid damage as a result of sudden
sharp changes in ambient temperature, mechanical stress, or physical
shocks.
3. Demagnetization Switch (DEMAG)
This switch demagnetizes the core which can become magnetized when
turning the power ON or OFF, or when applying excessive input. You must
always use this switch prior to performing measurement. The time required
for demagnetization is approximately one second. During demagnetization, a
degaussing waveform is output.
4. Zero Adjust Trimmer
DLM series and other digital oscilloscopes utilize an automatic zero
adjustment function. Normally, the zero adjustment trimmer is not used for the
adjustment. However, if the residual offset exceeds the automatic adjustment
range and automatic zero adjustment fails, you can turn the trimmer to carry
out the zero adjustment. This compensates for the effects of the probe's
offset voltage, temperature drift, and other phenomena. Before performing
measurement, demagnetize the probe then carry out zero adjustment (see
page 4).
• Adjustment with the Zero Adjust Trimmer
You can adjust the offset voltage using an appropriate driver as described
below. Use a driver that fits the adjustment groove. Using a driver with
a large grip or a small head, or applying excessive force can result in
damage to the adjustment turn stop or grooves.
• Example Driver Bit Dimensions (Reference value)
Head thickness (W): 0.4 mm, head length (L): 1.8 mm (driver length:
10 mm or more), head shape: minus.
W
L
5. Probe Interface
The point of connection to the input of the digital oscilloscope. Outputs the
measured current waveform at a constant rate (0.1 V/A, in combination with
1 MΩ impedance). The output terminal is a BNC connector. Connect to a
digital oscilloscope that supports the YOKOGAWA probe interface.
IM 701928-01E
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