138 Chapter2
Making Adjustments
21. Correcting for External ALC Error for Option 010 or 011
14.Adjust the SRC PWR for −34 dBV as read on the analyzer display.
15.Note the voltage on the DMM. Wait until the reading stabilizes
before recording it in the space provided. This is the ALC voltage at
a source power of −34 dBV (V
Low
).
V
Low
= ______________volts dc
16.Calculate the actual slope from the two voltage measurements using
the following equation.
Slope = ______________
For example, if V
High
is 0.949V and V
Low
is 0.019V, then the slope is
10.47 divided by 33.97, or 0.3082.
17.Calculate the offset from the calculated slope value (step 16) and the
measured V
High
(step 13) using the following equation.
Offset = ______________
For example, given the same V
High
and V
Low
values as listed in the
slope example.
18.Enter the calculated Slope and Offset correction constants into
nonvolatile memory using the TITLE mode as previously described
in step 9.
19.Perform the “Checking the External Leveling” procedure to ensure
correct operation.
Slope =
10.47
20x
V
High
V
Low
--------------log
--------------------------------
Offset = 3095 - Slope x 2000 x log V
High
()()
Offset = 3095 - 0.3082 x -45.47
Offset = 3095 - (-14.01)
Offset = 3109
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