R&S FSH3 Measurements on CW Signals
Power and Reflection Measurements with the R&S FSH-Z44
The Directional Power Sensor R&S FSH-Z44 is connected between the source and the load and
measures 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 Directional Power Sensor R&S FSH-Z44 has an unsymmetrical 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).
It is 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 FSH3. The directional power sensor itself has to be inserted between the source and the
load.
Directional Power Sensor
R&S FSH-Z44
Source
Load
Power Sensor
connector
When measuring high powers, please pay strict attention to the following instructions to avoid personal
injury and prevent destruction of the power sensor:
• 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:
¾ Press the MEAS key.
¾ Press the MEASURE softkey.
The R&S FSH3 opens the menu for the measurement functions.
Use the cursor keys or the rotary knob to select POWER SENSOR and confirm your selection with the
ENTER key or by pressing the MEASURE softkey.
1145.5973.12 2.7 E-6
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