Chapter 2 59
Making Measurements
Example 2: Improving Amplitude Measurements with Ampcor
Using the ampcor data.
1. With ampcor on, the amplitude measured by the analyzer at the
correction-point frequencies should agree with the power meter
reading ±0.2 dB. This error is due primarily to the spectrum
analyzer marker amplitude resolution, which ranges from 0.017 dB
to 0.17 dB, depending upon the log scale selected.
2. If you want to turn off ampcor, press
AMPCOR ON OFF so that OFF is
selected. The correction to the trace is now turned off, but the
correction values remain in memory.
3. If you want to purge the ampcor correction data, press
PURGE CORR
and purge the correction data. The correction values are now gone
from active memory.
Ampcor Limitations
When using the ampcor function consider the following:
Trace data above or below the graticule
If any of the uncorrected trace data is above or below
the graticule, the ampcor function will not properly
correct it. The spectrum analyzer amplitude accuracy is
not specified above or below the graticule. Anytime
ampcor applies a correction such that data outside the
graticule is moved to within the graticule, an error
(error number 921 or 922) is generated. In order to
avoid these errors, make sure that the trace data which
is being corrected is within the graticule before the
correction is applied.
Measurements near the bottom of the graticule
If you are using 10 dB/division and the measurements
occur in the bottom division of the display, imperfect log
fidelity will cause errors in the correction.
Flatness correction and temperature drift
If the factors that contribute to poor flatness are
temperature dependent, the corrections will not be as
effective.
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