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When user flatness correction is enabled, the sum of the two arrays
produces the 1601 reference voltages for the ALC system.
1601 Equadistant
Point Array
Accessible Only
From a
Computer
User Flatness Correction Array
CorPair
1601 Points of
lntemol
Calibration Data
of Correction
1601 Paints
for ALC
Figure F-3. The Sources of ALC Calibration Correction Data
If the correction frequency span is only a subset of the start/stop
frequency span set on the source, no corrections are applied to the
portion of the sweep that is outside the correction frequency span.
The following example illustrates how the data is distributed within
the user flatness correction array.
Assume that the swept signal generator is set to sweep from 2 to
18 GHz, but you only enter user flatness correction data from
14 to 18 GHz. Linear interpolation occurs between the correction
entries to provide the 401 points required for the 14 to 18 GHz
portion of the array. No corrections are applied to the 2 to
13.99 GHz portion of the array. Refer to Figure F-4.
Point Number
--)
0
1200 1600
No Corrections Applied
401 Points
of Data
Frequency
--)
2GHz
14GHz
18GHz
1st Corr. Freq.
Figure F-4.
Array Configuration when the Correction Data Frequency Span
is a Subset of the Swept Signal Generator Frequency Span
Number of points interpolated between correction entries is
calculated as follows:
freq. span between correction entries
stop frequency
-
start frequency
I
1600
-
1 = Number of pts
F-8 Operating and Programming Reference
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