Two-port measurements with the tracking generator
R&S FSH
1145.5973.12 4.98
E-11
and whose radius is determined by the VSWR value. All values within the circle have a VSWR value
that is smaller than the VSWR value defined by the circle.
To activate the VSWR limit value:
If starting from the main menu for the tracking
generator, press the MEAS key. If starting from
any other menu, press the MEAS key twice.
Press the LIMIT LINES softkey.
The R&S FSH displays the menu for limit values in a
Smith chart representation. If a VSWR limit value is
already activated, the VSWR LIMIT softkey label is
highlighted in green.
To enter a VSWR limit value or to activate the
available limit value, press the VSWR LIMIT key.
Change the displayed VSWR limit value to the
desired value by using the rotary knob, or enter a
new limit value by using the numeric keys.
Press the ENTER key to complete the entry.
To deactivate the VSWR limit value:
If starting from the main menu for the tracking generator, press the MEAS key. If starting from any
other menu, press the MEAS key twice.
Press the LIMIT LINES softkey.
The VSWR LIMIT softkey label is highlighted in green.
Press the LIMIT LINES softkey twice.
The VSWR limit value is now deactivated.
As with limit value lines in scalar diagrams, the R&S FSH also offers automatic monitoring of limit
values in Smith charts. If the entire impedance trace falls within the VSWR circle, the R&S FSH returns
PASS after each sweep. If part of the trace falls outside the circle, FAIL is returned.
Limit value monitoring can be configured by using the OPTIONS softkey from the LIMIT LINES menu
(see section "Using Limit Lines").
