R&S FSH Getting Started
Using a Power Sensor
Quick Start Guide 1309.6269.12 - 09 67
2.3.2 Measuring Power and Return Loss
With the directional power sensors R&S FSH-Z14 and R&S ZVH-Z44 you can measure
the power in both directions.
When you connect the directional power sensor between the source and the load, the
R&S FSH measures the power from source to load (forward power) and from load to
source (reverse power).
The ratio between forward and reverse power is a measure of the load matching. The
R&S FSH displays it as the return loss or standing wave ratio.
The power sensors for the R&S FSH have an asymmetrical design. Therefore, they
have to 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).
When measuring high powers, pay strict attention to the following instructions to avoid
personal injury and to prevent the power sensor from being destroyed.
Danger of skin burns and damage to the instrument
● Never exceed the permissible continuous power.
● See diagram on the rear of the sensor for the permissible continuous power.
● Turn off the RF power to connect the sensor.
● Screw the RF connectors tightly..
Test setup
Connect the cable of the power sensor to the power sensor jack of the R&S FSH and
insert the directional power sensor between the source and the load.
1 Directional power sensor R&S FSH-Z14 or Z44
2 Source
3 Load
4 Power sensor jack
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