Measuring forward and reflected power R&S FSH
1309.6275.12 4.76 E-2
Using the rotary knob or the cursor keys select the
measurement time you want from the menu (i.e.
SHORT, NORMAL or LONG).
Confirm your selection with the ENTER key or by
pressing the TIME softkey again.
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 FSH 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.
Press the AMPT key.
Press the REF OFFSET softkey.
The value entry box for the reference offset opens.
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
The Directional Power Sensors R&S FSH-Z14 and R&S FSH-Z44 are connected between the source
and the load and measure 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 Sensors R&S FSH-Z14 and R&S FSH-Z44 are of non-symmetrical design, i.e.
they 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 sensors are 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 FSH. The
sensor is to be connected between the source and the load.
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