R&S RT-ZC20 User Manual page 21

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R&S RT-ZC20
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Immediately after powering on, this device may be subject to an appre-
ciable offset drift due to the effect of self-heating. To counteract this,
allow the device to warm up for about 30 minutes before carrying out
measurements.
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When performing continuous measurements, it is necessary to be
aware that the offset voltage drifts, depending on factors such as the
ambient temperature.
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Under certain circumstances, oscillation may occur while the power sup-
ply is on. This does not indicate a malfunction. Oscillation can be stop-
ped and operation restored to normal by opening and closing the sensor
head.
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Depending on the amplitude and frequency of the current being mea-
sured, the sensor head may emit a resonant sound. This sound may
also occur during demagnetizing operation, but it does not represent a
malfunction or device failure.
If foreign matter is adhered to the facing surfaces on the sensor head so
that a slight gap exists between the upper and lower sensors, the sen-
sor head may also emit a resonant sound. Remove any foreign matter
using the cleaning method described in this manual.
An increase in the volume of the resonant sound during use may indi-
cate that the gap between the upper and lower sensors has increased.
Since the sensor characteristics may change, it is recommended to cali-
brate the device.
User Manual 1409.7814.02 ─ 03
Allice Messtechnik GmbH
Putting into Operation
Connecting the Probe to the DUT
21