Power Meter
R&S
®
Spectrum Rider FPH
218
User Manual 1321.1011.02 ─ 11
5. Select "Cancel" softkey to abort zeroing, for example, if you cannot disconnect the
signal source.
The R&S Spectrum Rider immediately starts power sensor zeroing.
While zeroing is in progress, the R&S Spectrum Rider shows the message “Zero-
ing power sensor, please wait while the system is zeroing the power sensor”.
When zeroing is over, the R&S Spectrum Rider displays the message "
✓
Power
sensor zero done".
Selecting the unit for the power readout
The R&S Spectrum Rider can display measured power in relative units (dBm) or in
absolute units (W, mW,
µ
W, nW and
⍴
W). It is also possible to set a reference level in
dB.
1. Select "Unit" softkey.
A submenu to select the unit opens.
2. Select the unit you require.
The R&S Spectrum Rider adjusts the result display accordingly.
Setting the reference level
If you have selected the unit dB Rel, the R&S Spectrum Rider opens an input field to
set the reference level. The R&S Spectrum Rider shows the currently set reference
level in the diagram header.
1. Enter the reference level you require.
Alternatively, you can set the current level readout as the reference level.
2. Select "To Ref" softkey.
The R&S Spectrum Rider sets the current result as the reference level.
It then displays the measured level relative to the reference level in dB. The unit is
automatically set to dB Rel.
Setting the averaging time
The averaging time determines the length of the measurement. The longer the averag-
ing time, the more stable the display, particularly if signals have low power or are noisy.
The averaging time is either "Short", "Normal" or "Long".
●
A short measurement time provides stable and accurate results for stationary sine
signals with high levels (> -40 dBm). It is also appropriate for measurements that
require a high repetition rate.
●
A normal measurement time increases the stability of results for signals with low
levels or modulated signals.
●
A long measurement time is appropriate for signals with very low-power levels
(<-50 dBm)
Using a Power Sensor
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