R&S FSH
Working with Power Sensors
Using a Power Sensor
Operating Manual 1309.6275.12 - 14
115
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Enter the frequency of the signal.
The R&S FSH transfers the new frequency 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.
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Press the "Zero" softkey.
The R&S FSH asks you not to apply
any signals to the power sensor during
the zeroing process.
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Disconnect the power sensor from any signal sources.
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Press the "Continue" softkey to start zeroing.
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Press "Cancel" to abort zeroing, for example, if you cannot disconnect the signal
source.
The R&S FSH immediately starts power sensor zeroing.
While zeroing is in progress, the
R&S FSH shows the message
“Zeroing power sensor, please
wait..”.
When zeroing is over, the R&S FSH shows the message
and switches back to the softkey menu for the power sensor.
Selecting the unit for the power readout
The R&S FSH can display measured power in relative units (dBm) or in absolute units
(W, mW,
Y
W, nW and pW). It is also possible to set a reference level in dB.
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Press the "Unit" softkey.
A submenu to select the unit opens.
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Select the unit you want.
The R&S FSH adjusts the result display accordingly.
Setting the reference level
If you have selected the unit dB Rel, the R&S FSH opens an input field to set the
reference level. The R&S FSH shows the currently set reference level in the diagram
header.
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Enter the reference level you want.
