User`s guide

Figure
@
MKR 349.9 MHZ
REF 0 darn
*TTEN 10 da
-ia 64 dB
PEAK
LOG
10
dE/
DL
-6 6
da
WA-SE
\
SC FC
COW
1.
----,.&--
CENTER 443 6
MHz SPAN 500.0
MHz
XRES BW
10 CHZ “BW 10 kHZ
SWP 50 msec
4-10. Measure the Rejection Range with Delta
Markers
Tracking Generator Unleveled Condition
When using the tracking generator, the message TG UNLVL may appear. The TG UNLVL message
indicates that the tracking generator source power (SRC PWR ON OFF ) could not be maintained
at the user-selected level during some portion of the sweep. If the unleveled condition exists
at the beginning of the sweep, the message will be displayed immediately. If the unleveled
condition occurs after the sweep begins, the message will be displayed after the sweep is
completed. A momentary unleveled condition may not be detected when the sweep time is
small. The message will be cleared after a sweep is completed with no unleveled conditions.
The unleveled condition may be caused by any of the following:
n Start frequency is too low or the stop frequency is too high. The unleveled condition is likely
to occur if the true frequency range exceeds the tracking generator frequency specification
(especially the low frequency specification). The true frequency range being swept may be
significantly different than the start or stop frequency annotations indicate, depending on
other spectrum-analyzer settings, especially the span (see specifications and characteristics in
your calibration guide for your instrument). For better frequency accuracy, use a narrower
span.
. Tracking peak may be required (use TRACKING PEAK ).
’ Source attenuation may be set incorrectly (select SRC ATN MAN AUTO (AUTO) for optimum
setting).
n The source power may be set too high or too low, use SRC PWR ON OFF to reset it.
n The source power sweep may be set too high, resulting in an unleveled condition at the end
of the sweep. Use PWR SWP ON OFF to decrease the amplitude.
4-12 Making Measurements