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Making Measurements Using Spectrum Analyzer Mode
Stimulus-Response Measurements
NOTE
If the automatic tracking routine is activated in a narrow resolution bandwidth, it usually is not
necessary to use the tracking adjust again when increasing the resolution bandwidth.
7. To make a transmission measurement accurately, the frequency response
of the test system must be known. To measure the frequency response
of the test system, connect the cable (but not the DUT) from the
tracking generator output to the spectrum analyzer input. Press
CTRACE),
TRACE A 3
C
(so B is underlined), CLEAR WRITE
B
, BLANK
B
The
frequency response of the test system is now stored in trace B.
8. To normalize, reconnect the DUT to the spectrum analyzer. Press
Cw”,
More 1 of 3,
NORMLIZE
ON OFF until ON is underlined. Press
NORMLIZE POSITION to activate the display line. This display line
marks the normalized reference position, or the position where 0
dB
insertion loss (transmission measurements) or 0
dB
return loss (reflection
measurements) will normally reside. Using the knob results in a change in
the position of the normalized trace, within the range of the graticule.
Normalization eliminates the frequency response error of the test system.
When normalization is on, trace math is being performed on the active
trace. The trace math performed is trace A minus trace B plus the display
line, with the result placed into trace A. Remember that trace A contained
the measurement trace, trace B contained the stored calibration trace, and
DL (display line) represents the normalized reference position. Note that
the units of the reference level,
dB,
reflect this relative measurement.
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