7
IM 701928-01E
1.
Perform all safety checks, and ensure that the preparations for
measurement (see page 4) have been taken.
2.
Pull the open/close lever to open the sensor head.
3.
Orient the probe so that the current direction arrow on the tip of the
sensor points in the same direction as the flow of current in the conductor
under measurement. Position the probe clamp around the conductor
under measurement so that the conductor is centered in the clamp hole.
4.
Press the open/close lever until the unlocked indicator goes out, then
confirm that the open/close lever is securely locked and that the sensor
head is securely closed.
5.
The current waveform can now be observed on the digital oscilloscope.
The output voltage rate of this probe is 0.1 V/A. For example, if the digital
oscilloscope’s voltage sensitivity is 10 mV/DIV, the current sensitivity
would be 100 mA/DIV.
Digital oscilloscopes that support the YOKOGAWA probe interface
automatically detect the probe and convert the display unit to current
sensitivity.
Note
• When the probe is used with a DLM series or another digital oscilloscope
equipped with the YOKOGAWA probe interface, the probe sensitivity is
automatically detected by the digital oscilloscope. If not automatically detected by
the digital oscilloscope, set the input impedance to 1 MΩ.
• If the probe is connected to the digital oscilloscope while the power is ON,
oscillations may occur occasionally but this does not indicate a malfunction. If this
occurs, opening and closing the sensor head with the open/close lever will stop
the oscillations and restore normal functioning.
• Resonant sound can be generated depending on the frequency of the measured
current. This will not affect measurement.
• The positive side of the waveform that is generated when you execute
DEMAG may not be symmetrical to the negative side, but this has no effect on
measurements.
• The position of the conductor under measurement within the clamp hole can affect
measurement. Keep the conductor in the center of the clamp hole.
• During measurement, press the open/close lever until the unlocked indicator goes
out, then confirm that the lever is securely locked and that the sensor head is
securely closed. Accurate measurements cannot be obtained if the sensor head is
not securely closed.
• In the high frequency domain, positioning the probe clamp on the high side of the
circuit can introduce common mode noise. As necessary, limit the bandwidth of
the waveform observation instrument, or position the probe clamp on the low side.
High
Low
Emission source
Load
• Accurate measurements may not be possible if operated within close proximity to
strong magnetic fields such as those produced by transformers, circuits with large
currents, and wireless devices.
