R&S FSH
Two-port measurements with the tracking generator
1145.5973.12 4.95
E-11
calibration with open circuit and short circuit, calibration with a 50 termination is necessary. Thus, the
characteristics of the VSWR bridge (directivity and impedances) no longer affect the measurement
result. Rather, the decisive factor is the quality of the calibration parameters open circuit, short circuit
and 50 termination.
Vector measurement therefore yields higher dynamic range and thus accuracy.
With vector measurements, the R&S FSH sets the bandwidths (Res BW and Video BW) to a fixed,
unchangeable value. It invariably uses the sample detector as a detector. All other measurement
parameters can be set as with scalar measurement.
Switching on vector measurement:
Press the MEAS key.
Press the MEAS MODE softkey.
Select VECTOR from the menu using the cursor
keys or the rotary knob.
Confirm your choice with the ENTER key or the
MEAS MODE softkey.
Calibration:
Before the R&S FSH is calibrated, the desired center frequency and span must be set. If they are set
later, the calibration values are lost and the calibration must be repeated.
Press the REFLECT CAL softkey.
The R&S
FSH displays a message requesting
termination of the measurement input into an open
circuit (Open).
Terminate the measurement input of the VSWR
bridge or the end of the measurement cable into
an open circuit.
Start open-circuit calibration by pressing the first or
the second softkey (CONTINUE). During
calibration, the R&S FSH outputs the message
"Calibrating OPEN, please wait...".
Calibration can be aborted at any stage with the
CANCEL softkey.
When the open-circuit calibration is over, the
R&S
FSH outputs a message requesting the
termination of the measurement port into a short
circuit.
Terminate the measurement input of the bridge or
the end of the measurement cable into a short
circuit.
Start the short-circuit calibration by pressing the
first or the second softkey (CONTINUE). During
calibration, the R&S FSH outputs the message
"Calibrating SHORT, please wait...".
