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Connecting the probe
R&S
®
RT-ZC20B
16
User Manual 1802.9967.02 ─ 01
3.4
Setting up and demagnetizing
Before starting measurements, demagnetizing the core and a zero adjustment of
the probe are required.
To demagnetize and zero-adjust the probe:
1. Connect the R&S
RT-ZC20B current probe as described in
.
2.
NOTICE!
Risk of circuit damage. Demagnetizing causes current to flow into
the conductor, which may damage parts in the circuit to be measured. Do not
demagnetize while the R&S
RT-ZC20B is clamping a conductor to be mea-
sured.
Make sure that there is no conductor in the sensor aperture.
3.
NOTICE!
Risk of instrument damage. When opening and closing the sensor
head of the probe, be sure to operate with the opening lever. If an upper core
is forced to open when the sensor head is locked, the open-close mechanism
can be damaged.
Press the opening lever until the UNLOCK indication disappears. Close the
sensor head properly.
4. On the oscilloscope, navigate to the probe settings. For more information,
refer to the user manual of your oscilloscope.
5. Select the channel the probe is connected to.
6. Tap "DeGauss".
This demagnetizes the core if it has been magnetized by switching the power
on and off, or by an excessive input. Always carry out demagnetizing before
measurement.
The demagnetizing process takes about one second. During demagnetizing, a
demagnetizing waveform is present at the output.
7. Change the "Zero adjust" value to adjust the waveform to zero position.
After demagnetizing always carry out a zero adjustment.
Tip:
Some Rohde
&
Schwarz oscilloscopes provide a "Detect AutoZero" func-
tion to demagnetize and adjust to zero position in one step.
Tip:
You can save the zero adjust value in the probe box. If you connect the
probe to another channel or to another appropriate Rohde
&
Schwarz oscillo-
scope, the value is read out again.
Setting up and demagnetizing