Agilent Technologies 89410A Service Manual page 138

Adjusting the Analyzer
To adjust anti-alias filter
6
Normalize the measurement.
a
Press the
[ setup 2
b Change the network analyzer to the following:
Receiver
Resolution BW
Source
Sweep Time
Start Frequency
Stop Frequency
c Wait for a complete sweep on the network analyzer.
d
Store the trace data in a storage register.
e
Set the network analyzer to divide the reference channel by the
storage register.
7 Check that there is at least 90 dB of rejection from 15.6 MHz to
54 MHz.
a
Press the [ setup 3
b Set the network analyzer's reference level to 0 dB.
c Set the scale to 10 dB/div.
d
Set the reference position to 100%.
e
Wait for a complete sweep on the network analyzer.
f Check that there is at least 90 dB of rejection from 15.6 MHz to
54 MHz.
If there is not 90 dB of rejection between 15.6 MHz and 54 MHz,
repeat the anti-alias filter adjustments starting at Step 1.
8 Reinstall the A10 Analog Input assembly.
a Set the power switch to off ( O ).
b
Place the assembly in the card nest.
c
Reconnect the following using original cables:
A10 J2 to A21 J4 (red cable)
A10 J3 to A36 J2 (channel 1, orange cable)
A10 J3 to A36 J5 (channel 2, orange cable)
If only the input assembly adjustments are being done, go to
"To adjust calibrator"to adjust the calibrator. The calibrator adjustment
2-22
] softkey.
reference channel
10 Hz
40 s
15.6 MHz
54 MHz
] softkey.
Chapter 2,