Measurements using the power sensor R&S FSH
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The power sensor has a memory containing frequency-dependent correction values. This means that
t
he highest accuracy is reached for signals whose frequency is known. If the R&S FSH switches over to
the power measurement mode from another operating mode, it uses the center frequency as the
frequency for the power sensor.
I
f you want to perform measurements on another known signal, the power sensor can be “told” what the
center frequency is via the frequency entry mode (FREQ softkey).
Press the FREQ softkey.
The frequency value entry box opens.
Using the number keys, enter the frequency you
want and confirm the entry with the ENTER key or
by pressing the FREQ softkey again.
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 low powers are being
measured. Zeroing is used to compensate for these offsets. The power sensor zeroes itself
automatically when instructed to do so by the user. No power may be applied when zeroing is being
performed, as the power sensor cannot distinguish between external powers and internal offsets.
Press the ZERO softkey.
The R&S FSH outputs a message to tell the user not to
apply any signals to the power sensor when zeroing is
being performed.
Disconnect the power sensor from any signal
sources.
Start zeroing by pressing the CONTINUE softkey.
Press CANCEL to abort zeroing, if, for example, a
signal source cannot be disconnected.
The R&S FSH immediately starts power sensor
zeroing. While zeroing is in progress, the R&S FSH
outputs the message “Zeroing power sensor, please
wait..”.
When zeroing is over, the R&S FSH outputs the
message "Power sensor zero OK" and switches back
to the softkey menu for the power sensor.
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