Power Meter
R&S
®
Cable Rider ZPH
255
User Manual 1321.0950.02 ─ 07
Risk of damage to the power sensor
Before you start to work with the power sensor, make sure that the continuous power
applied to the input of the power sensor does not exceed a certain level.
Refer to the documentation of the power sensor for more information on the maximum
input power.
If the R&S Cable Rider ZPH recognizes a power sensor, it sets up a connection via the
interface and after a few seconds shows the measured power. It displays the type of
the power sensor in the display header.
If no power sensor has been connected or it is not connected appropriately, the R&S
Cable Rider ZPH shows nothing.
If there are communication problems between the R&S Cable Rider ZPH and the
power sensor, the R&S Cable Rider ZPH displays one of the following error messages
that indicate the possible cause.
Table 9-1: Error message for power sensor
Message
Cause
Remedy
Error in zeroing: signal at sensor
A signal was present at the power
sensor when zeroing was per-
formed.
Unscrew the power sensor from
the device under test and repeat
zeroing.
Warning: Input overloaded
The power at the input of the
power sensor exceeds the permit-
ted power (23 dBm = 200 mW).
Reduce the power at the sensor
input.
Power sensor hardware error
Communication error between the
R&S Cable Rider ZPH and the
power sensor.
Unscrew the sensor from the R&S
Cable Rider ZPH and check the
connectors.
If the problem persists, contact a
Rohde & Schwarz service center.
Power sensor error
The power sensor signals an
error to the R&S Cable Rider ZPH
Contact a Rohde & Schwarz ser-
vice center.
Unknown power sensor model
connected
The R&S Cable Rider ZPH can-
not identify the device connected
to the power sensor interface.
9.1.2
Performing and Configuring Measurements
After you have connected a power sensor, the R&S Cable Rider ZPH immediately
starts to measure the signal power.
Defining the center frequency or wavelength
Power sensors have a memory containing correction values that are dependent on the
frequency or wavelength. Hence, measurement results are the most accurate for sig-
nals whose frequency or wavelength you know.
Using a Power Sensor
