Agilent Technologies 89410A Service Manual page 124

Adjusting the Analyzer
To adjust oven shutdown
2
Set up the spectrum analyzer.
a
Set the spectrum analyzer as follows:
Center Frequency
Frequency Span
Reference Level
b
Connect the spectrum analyzer to the Agilent 89410A's OVEN
REF OUT connector using the BNC cable.
3 Check that the 10 MHz signal is
a Set the power switch to on ( l ).
b
Check that the amplitude of the 10 MHz signal is
is cold).
4 Adjust A85 R2.
a
Change the spectrum analyzer's reference level to 10 dBm.
b
Turn A85 R2 counterclockwise until the 10 MHz signal's
amplitude is > 0 dBm.
c Turn A85 R2 clockwise until the signal's amplitude just returns to
approximately -70 dBm, then turn R2 an additional 10 degrees
clockwise.
2-8
10 MHz
1 MHz
−60 dBm
≤
-70 dBm.
≤
-70 dBm (oven