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Adjusting the Analyzer
To adjust reference oscillator
2 Adjust A60 C55.
a Center A60 R66 by turning the potentiometer to the end and then
10 turns back.
This is the fine frequency adjustment potentiometer. It needs to
be centered before the coarse frequency adjustment is done.
b Connect the frequency counter to A60 J2 using the
SMB(f)-to-BNC(m) cable.
c Set the power switch to on ( l ).
d Adjust A60 C55 for a frequency counter reading of 25.6 MHz
±50 Hz using the flat-edge adjustment tool.
3 Reinstall the A60 Frequency Reference assembly.
a Set the power switch to off ( O ).
b Place the assembly in card nest.
c Set the power switch to on ( l ).
4 Wait 5 minutes, then adjust A60 R66.
a Wait 5 minutes for the frequency oscillator to stabilize.
b Adjust A60 R66 for a frequency counter reading of 25.6 MHz
±10 Hz using the plastic screw driver.
5 Reconnect the cables.
a Set the power switch to off ( O ).
b Reconnect the following using original cables:
A60 J2 to A10 J1 (channel 2)
A60 J3 to A10 J1 (channel 1)
A60 J4 to rear panel EXT REF IN (green cable)
A60 J5 to rear panel EXT REF OUT (gray cable)
This completes the A60 Frequency Reference assembly adjustments.
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