Power Meter
R&S
®
Cable Rider ZPH
256
User Manual 1321.0950.02 ─ 07
Center frequency
Note that the R&S Cable Rider ZPH maintains the center frequency that you have set
in another operating mode. In that case, it uses that frequency as the power sensor fre-
quency.
If you want to perform measurements on another known signal, you can change the
power sensor frequency manually.
1. Select the "Freq" softkey.
The R&S Cable Rider ZPH opens an input field to define the frequency opens.
2. Enter the frequency of the signal.
The R&S Cable Rider ZPH transfers the new frequency to the power sensor which
then corrects the measured power readings.
Wavelength
Wavelength is typically used in the measurement result for optical power sensor mea-
surement. The R&S Cable Rider ZPH supports the wavelength: 850 nm, 1300 nm,
1310 nm, 1490 nm, 1550 nm, 1610 nm, 1625 nm for measurement.
1. Select the "wavelength" softkey.
The R&S Cable Rider ZPH opens a submenu for the selection of wavelength set-
tings.
2. Select the required wavelength for measurement.
The R&S Cable Rider ZPH transfers the new wavelength to the power sensor
which then corrects the measured power readings.
Zeroing the power sensor
Offset voltages and currents have most effect on the power readout when measuring
low powers. You can compensate for these offsets by zeroing the power sensor.
Do not apply power during the zeroing process, as the power sensor cannot distinguish
between external powers and internal offsets.
1. Select the "Zero" softkey.
2. The R&S Cable Rider ZPH asks you not to apply any signals to the power sensor
during the zeroing process.
3. Disconnect the power sensor from any signal sources.
4. Select the "Continue" softkey to start zeroing.
Using a Power Sensor
