Rohde & Schwarz RTP Series - Setup for Unknown Probes

Acquisition and waveform setup
R&S
®
RTP
187User Manual 1337.9952.02 ─ 12
Detect AutoZero
If a current probe is connected, the function demagnetizes the probe's sensor head
and sets the waveform to zero position to correct the error offset. Thus, it compensates
for the remanence and offset caused by temperature drift.
For R&S RT-ZCxxB probes, the determined "Zero adjust" value is displayed and can
be saved in the probe head.
See also "Detect AutoZero, Use AutoZero" on page 166.
Remote command:
PROBe<m>:SETup:OFFSet:AZERo on page 1208
Zero adjust
Zero adjust corrects the effect of an offset caused by temperature drift, and compen-
sates for the remanence. The setting is only available if DC coupling is set.
To set the waveform to zero level by the instrument, use "Detect AutoZero". The detec-
ted value is displayed.
Alternatively, you can adjust the value manually until the waveform is set to zero level.
Make sure to demagnetize the probe before zero adjustment.
The value is given in percent of the maximum range, which is internally defined. The
actual setup range depends on the temperature drift, the measured current and other
variables, and it can change over time. If you measure high currents, the probe core
magnetizes, which impairs the measurement results. Therefore, repeat "Detect Auto-
Zero" before the measurement.
Remote command:
PROBe<m>:SETup:OFFSet:ZADJust on page 1226
Save to probe
Saves the "Zero adjust" value in the probe box. If you connect the probe to another
channel or to another R&S RTx oscilloscope, the value is read out again, and you can
use the probe without further adjustment.
Remote command:
PROBe<m>:SETup:OFFSet:STPRobe on page 1226
5.6.8 Setup for unknown probes
If the R&S RTP cannot detect the probe, and the probe is not a predefined one, you
can set the probe parameters manually.
The following shared probe settings are available:
●
"Type, Name, Bandwidth" on page 166
●
"Detect AutoZero, Use AutoZero" on page 166
Probes