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Making Measurements Using Spectrum Analyzer Mode
Stimulus-Response Measurements
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:
l 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
speciEcation). 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 speciEcations
and characteristics in your calibration guide for your instrument). For
better frequency accuracy, use a narrower span.
l Tracking peak may be required (use TRACKING PEAK
).
l Source attenuation may be set incorrectly (select SRC ATN MAN AUTO
(AUTO) for optimum setting).
l The source power may be set too high or too low, use SRC PWR ON OFF to
reset it.
l 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.
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