Specifications

R&S FSH Setting and Using the Measurement Functions
1145.5973.12 4.75 E-10
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.
¾ 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.
¾ Disconnect the power sensor from any signal
sources.
¾ Start zeroing with the first or second softkey
(CONTINUE).
Softkeys 4 or 5 (CANCEL) can be used 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.
Selecting the unit for the power readout
The R&S FSH can display measured power in relative units (dBm) or in absolute units in Watts (W,
mW, µW, nW and pW). A reference level in dB is also provided by the R&S FSH.
¾ Press the UNIT softkey.
The units submenu then opens.
¾ Using the rotary knob or the cursor keys select the
appropriate unit.
¾ Confirm with the ENTER key or the UNIT softkey.