2-35
Adjusting the Analyzer
To adjust oven frequency
2 Set up the oscilloscope.
a Connect the frequency standard’s output to the oscilloscope’s
external trigger. Check that the frequency standard is properly
terminated.
b Set the oscilloscope as follows:
c Connect the rear panel OVEN REF OUT connector to the
oscilloscope’s channel 1 input.
3 Adjust A85 HR1.
a Adjust A85 R12 to the center of its adjustment range.
b Remove the oven adjustment screw.
c Adjust the A85 HR1, FREQ ADJ, for a stable (not moving) display
on the oscilloscope.
4 Adjust A85 R12.
a Change the oscilloscope timebase to 10 ns per division.
b Adjust A85 R12 for a stable display on the oscilloscope.
Channel 1
Volts/Div
Offset
Coupling
100 mV/div
0 V
1 M
Ω ac
Timebase
Time/Div
Sweep
50 ns/div
Triggered
Trigger
Level
Slope
Mode
Source
0 V
Positive
Edge
External Trigger
Display
Mode
Screen
Real Time
Single
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