Setting and Using the Measurement Functions R&S FSH3
Taking additional loss or gain into account
At high powers which cause the R&S FSH-Z1’s maximum input level to be exceeded or at very low
levels which are below the instrument's minimum sensitivity, the R&S FSH3 can take additional loss or
gain introduced between the DUT and the power sensor into account. These are defined in terms of an
offset in dB relative to the measured level. A positive offset corresponds to a loss and a negative offset
to a gain.
¾ Press the AMPT key.
¾ Press the REF OFFSET softkey.
The value entry box for the reference offset opens.
¾ Using the rotary knob, the cursor keys or the
number keys enter the offset you want and confirm
the entry with the ENTER key.
The offset is displayed centrally at the top of the
screen and is taken into account in the power or level
display.
Measuring forward and reflected power
with the Directional Power Sensor R&S FSH-Z44
The Directional Power Sensor R&S FSH-Z44 is connected between the source and the load.
It measures the power flow in both directions, i.e. from the source to the load (forward power) and from
the load to the source (reflected power). The ratio of forward to reflected power indicates how well a
load is matched to the source. This ratio is referred to as return loss or voltage standing wave ratio
(VSWR).
The Directional Power Sensor R&S FSH-Z44 is of non-symmetrical design, i.e. it must be connected
such that the forward arrow (1 → 2) on the sensor points to the load (corresponding to the direction of
forward power).
The directional power sensor is controlled and powered via a special serial interface. The sensor cable
is to be connected and screwed to the POWER SENSOR connector on the R&S FSH3. The sensor is
to be connected between the source and the load.
Directional Power Sensor
R&S FSH-Z44
Source
Load
Power Sensor
connector
1145.5973.12 4.48 E-6
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