R&S FSH
Measurements on CW Signals
1145.5973.12 2.7
E-11
Power and Return Loss Measurements with the R&S FSH-Z14 or the
R&S FSH-Z44
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 flux in both directions, i.e. from the source to the load (forward
power) and from the load to the source (reverse power). The ratio between reverse power and forward
power is a measure of the load matching and is displayed as the return loss or standing wave ratio.
The R&S FSH-Z14 and the R&S FSH-Z44 have an asymmetrical design and must therefore be inserted
into the test setup in such a way that the FORWARD arrow on the sensor points toward the load (= in
the direction of the power flux).
They are driven and powered via a special serial interface.
The cable on the power sensor must be connected and screw-fastened to the power sensor connector
on the R&S FSH. The directional power sensor itself has to be inserted between the source and the
load.
Directional Power Sensor
R&S FSH-Z14 / R&S FSH-Z44
Source
Load
Power sensor
connector
When measuring high powers, pay strict attention to the following instructions to avoid personal injury
and to prevent the power sensor from being destroyed:
•
Never exceed the permissible continuous power (see diagram on the rear of the
sensor).
•
Connect the sensor only when the RF power is off.
•
The RF connectors must be screwed tight.
Failure to follow these rules can lead to injuries such as skin burns or cause the
destruction of the measurement instruments in use.
Operation:
!
Press the MEAS key.
!
Press the MEASURE softkey.
The R&S FSH opens the menu for the measurement functions.
Using the cursor keys or the rotary knob, select POWER SENSOR and confirm with the ENTER key or
by pressing the MEASURE softkey.
