Measurements on CW Signals R&S FSH3
The R&S FSH3 opens the screen and the menu for the power measurement. If no power sensor is
connected, no measured value is displayed. If a power sensor is connected, the R&S FSH3 establishes
a connection to the power sensor via the interface and displays after a few seconds the connected
power sensor type (R&S FSH-Z44) as well as the measured forward power and return loss of the load.
Before performing the power measurement, the power sensor should be zeroed.
¾ Press the ZERO softkey.
The R&S FSH3 informs the user that no signals must
be applied while the power sensor is being zeroed.
¾ Disconnect the power sensor from any signal
sources.
¾ Start zeroing with the first or second softkey
(CONTINUE).
Softkey 4 or 5 (CANCEL) can be used to cancel
zeroing before it begins if, for example, the signal
source cannot be disconnected.
The R&S FSH3 immediately starts power sensor zeroing. While this is going on, the R&S FSH3 outputs
he message "Zeroing power sensor, please wait...". t
When zeroing is over, the R&S FSH3 outputs the message "Power Sensor Zero OK" and switches back
to the softkey menu for the power sensor.
¾ Now connect the R&S FSH-Z44 between the source and the load.
¾ The R&S FSH3 displays the measured forward power level in dBm and the return loss of the load in
dB.
To achieve highest measurement accuracy, enter the frequency of the signal under test.
¾ Press the FREQ softkey.
The R&S FSH3 opens the entry box for the frequency.
¾ Using the number keys, enter the desired frequency
and terminate the input with the ENTER key or by
pressing the FREQ softkey again.
The R&S FSH3 transfers the new frequency to the
power sensor which then corrects the measured power
readings.
1145.5973.12 2.8 E-6
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