2-8
Adjusting the Analyzer
To adjust oven shutdown
2 Set up the spectrum analyzer.
a Set the spectrum analyzer as follows:
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
≤-70 dBm.
a Set the power switch to on ( l ).
b Check that the amplitude of the 10 MHz signal is
≤-70 dBm (oven
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.
Center Frequency
Frequency Span
Reference Level
10 MHz
1MHz
−60 dBm
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