Power Meter
R&S
®
Cable Rider ZPH
261
User Manual 1321.0950.02 ─ 07
The R&S Cable Rider ZPH indicates the weighting mode at the forward power
heading.
● "Average" = average power
● "Peak Envelope" = peak envelope power
Selecting the unit for the power readout
When using a directional power sensor, the R&S Cable Rider ZPH displays the forward
power as a logarithmic level value in dBm (relative value) or as a linear value in W or
mW (absolute value). In addition, you can define a reference level relative to which the
R&S Cable Rider ZPH indicates the level difference in dB. Load matching is indicated
as return loss in dB or as voltage standing wave ratio (VSWR). In addition, the abso-
lutely reflected power can be displayed in W, or the reflected level in dBm.
For more information, see
"Selecting the unit for the power readout"
on page 257.
Setting the reference level
If you have selected the unit dB Rel for the forward power, the R&S Cable Rider ZPH
opens an input field to set the reference level. The R&S Cable Rider ZPH shows the
currently set reference level in the diagram header.
For more information, see
"Setting the reference level"
on page 257.
Selecting a standard
To ensure that true results are output when measuring modulated signals, the R&S
Cable Rider ZPH offers the possibility of taking correction values into account for sev-
eral common telecommunications standards.
1. Select the "Standard" softkey.
A menu to select a standard opens.
2. Select the standard you require.
The R&S Cable Rider ZPH takes the selected standard into account. The currently
active standard is displayed in the display header.
Taking additional attenuation into account
When the directional power sensor is connected to a test point not directly but via a
cable, the influence of cable attenuation can be taken into account. For this purpose,
the cable attenuation for the measurement frequency in question is to be entered is
based on the following condition:
Condition for setting cable attenuation
●
As a positive dB value if the power and matching are to be measured at the source
and the cable is connected between the source and the power sensor
●
As a negative dB value if the power and matching are to be measured at the load
and the cable is connected between the load and the power sensor
The directional power sensor then corrects the power and matching values to produce
the results that would have been obtained if it had been directly connected to the test
point.
Using a Directional Power Sensor
