Agilent Technologies 89410A Service Manual page 151

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:
Channel 1
Volts/Div
Offset
Coupling
Timebase
Time/Div
Sweep
Trigger
Level
Slope
Mode
Source
Display
Mode
Screen
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.
100 mV/div
0 V
Ω
1 M ac
50 ns/div
Triggered
0 V
Positive
Edge
External Trigger
Real Time
Single
Adjusting the Analyzer
To adjust oven frequency
2-35