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R&S FSH
Two-port measurements with the tracking generator
1145.5973.12 4.93
E-14
Measuring the electrical length when measuring transmission
The electrical length is calculated from the phase delay
f
=
2
, where
designates the entire
phase deviation over the entire frequency range. The electrical length is derived by
c
l
0
=
,
where
c
0
= velocity of light. The result for the electrical length will be correct only if the phase difference
between two adjacent test points does not exceed 180°.
Note:
By definition, the electrical length is calculated from the vacuum velocity of light and the differential
group delay
g
(see below). Here, the group delay is replaced by the phase delay for two reasons:
•
An electrical length needs to be specified only for non-dispersive DUTS in which phase delay and
group delay match.
•
Due to the significantly wider aperture, the measurement certainty is an order of magnitude higher in
the phase delay measurement than in the group delay measurement.
Press the MEAS MODE softkey.
Using the rotary knob or the cursor keys, select
PHASE from the menu and confirm by pressing
either the MEAS MODE softkey or the ENTER key.
Press the EL LENGTH softkey.
Using the rotary knob or the cursor keys, select EL
LENGTH ON from the menu and confirm by
pressing either the EL LENGTH softkey or the
ENTER key.
The R&S FSH will display the calculated electric
length.
You can deactivate the electric length display as
follows:
Press the EL LENGTH softkey.
Using the rotary knob or the cursor keys, select EL
LENGTH OFF from the menu and confirm by
pressing either the EL LENGTH softkey or the
ENTER key.
The R&S FSH will now display the DUT's electric
length.
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