R&S FSH
Measurements on CW Signals
1145.5973.12 2.11
E-11
Measurement of Return Loss
(Only for R&S FSH with tracking generator: order no. 1145.5850.13, 1145.5850.23 or 1145.5850.26.)
For reflection measurements, the VSWR Bridge and Power Divider R&S FSH-Z2 or R&S FSH-Z3 and a
short standard (supplied with the R&S FSH-Z2) are needed. The R&S FSH-Z2 or R&S FSH-Z3 is
screw-connected to the RF input connector and the generator’s output.
R&S FSH with VSWR Bridge R&S FSH-Z3
VSWR Bridge
and
Power Divider
R&S FSH-Z2
Test port
Control
cable
R&S FSH with VSWR Bridge
R&S FSH-Z2
!
Connect the control cable of the R&S FSH-Z2/-Z3 to the power sensor connector of the R&S FSH.
!
Connect the RF and generator port of the R&S FSH-Z2/-Z3 to the RF input and generator output of
the R&S FSH.
The test setup must be calibrated before any measurements are made. This is done with a short and an
open at the point were the reflection measurement is to be made. If a cable is to be inserted between
the DUT and the bridge, perform the calibration at the measurement end of the cable.
!
Press the MEAS key.
!
Press the MEASURE softkey.
!
Using the cursor keys or the rotary knob, select TRACKING GEN from the menu and confirm with the
ENTER key or the MEAS softkey.
The R&S FSH switches on the tracking generator and calls up its softkey menu. Since no calibration
has been performed, Track Gen Uncal appears in the upper right-hand corner of the measurement
diagram.
Before performing calibration, set the required span because calibration is valid only for the calibrated
span. Changing the frequency settings after calibration invalidates calibration.
!
Press the FREQ key.
!
Using the numeric keys, enter the center frequency.
!
Press the SPAN key.
!
Using the numeric keys, enter the span.
Alternately, the start and stop frequency can be input using the START and STOP softkeys in the
frequency menu.
