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Model 8902A
Operation
RF
Input
Attenuation
RF
Gain
I
RF
Attenuation
RF Input Attenuation and Gain
Special Function
Code
FUNCTIONS
Special Function 1 (RF Input Attenuation and Gain)
Automatic Selection
DESCRIPTION
Automatic Selection
1.0 SPCL
1 .OSP
0
dB
1.1 SPCL
1.1SP
T h e RF input attenuation and gain is usually automatically selected but can be manually set by
keyboard entry using Special Function 1.
10
dB
20 dB
PROCEDURE
1.2 SPCL
1.2SP
1.3 SPCL
1.3SP
To set the input attenuntion/gain to a selected range, or to enter an automatic selection mode, key
in the corresponding special function code, then select
SPCL:
24 dB
24
dB
0 dB
1.7 SPCL
1.7SP
10
dB
1.8 SPCL
1.8SP
~
Automatic Selection
Automatic Selection
always inserted*
with
10 dB
attenuation
1.9 SPCL
1.9SP
30
dB
I
1.4 SPCL
I
1.4SP
0 dB
I
I
40 dB
I
1.5 SPCL
I
1.5SP
COMMENTS
Default Condition.
When the Measuring Receiver is first powered up, or when Automatic Operation or Instrument
Preset is selected, the RF input attenuation/gain is placed in the automatic selection mode (Special
Function 1
.O).
Error 02, 03.
If the RF input attenuation/gain is manually set
to
a range that causes the input signal level to
overdrive the input mixer, Error 02 is displayed. If the RF input attenuation/gain is manually set so
the signal level reaching the IF circuits is too low for accurate measurements, Error 03 is displayed.
3-265
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