Agilent Technologies 8590L Service Manual page 137

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
16.Calculate the actual slope from the two voltage measurements using
the following equation.
For example, if V
High
10.47 divided by 33.97, or 0.3082.
17.Calculate the offset from the calculated slope value
measured V (step
High
Offset = 3095 - Slope x 2000 x log V
For example, given the same V
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.
138
).
Low
V
10.47
Slope = ------------------------------- -
V
High
20x log ------------- -
V
Low
is 0.949V and V
Low
13) using the following equation.
(
and V
High
Offset = 3095 - 0.3082 x -45.47
Offset = 3095 - (-14.01)
Offset = 3109
= ______________volts dc
Low
Slope = ______________
is 0.019V, then the slope is
(step 16) and the
( ) )
High
Offset = ______________
values as listed in the
Low
Chapter 2