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Model 8902A
Operation
Wide
Narrow IF
IF
Filter
Filter
(30 kHz BW)
IF
Frequency
Special
Program Code
Function
a
Code
3.0 SPCL
3.0SP
Automatic Selection
3.1 SPCL
3.1 SP
455 kHz
200 kHz BW
OUT
3.2 SPCL
3.2SP
1.5 MHz
OUT
3.3 SPCL
3.3SP
455 kHz
200 kHz BW
OUT
3.4 SPCL
3.4SP
1.5 MHz
OUT
3.5 SPCL
3.5SP
455 kHz
200 kHz BW
IN
3.6 SPCL
3.6SP
455 kHz
IN
3.7 SPCL
3.7SP
455 kHz
200 kHz BW
IN
3.8 SPCL
3.8SP
455 kHz
IN
2.5 MHz
Low-Pass
2.5 MHz
Low-Pass
2.5 MHz
Low-Pass
2.5 MHz
Low-Pass
DETAILED DESCRIPTIONS OF
ALL
SPECIAL FUNCTIONS
RF High-Pass
Filter
(5.25 MHz)
OUT
OUT
OUT
IN
IN
OUT
OUT
IN
IN
1. RF Input Attenuation
and
Gain. Use this special function to select
RF
input attenuation o r
amplification to eliminate input overload or to improve measurement sensitivity. For more details
about this function, refer to RF Inpirt Arreniration and Gain on page 3-265.
1 .O Automatic selection
1.1 Attenuation of 0 dB
1.2 Attenuation of 10 dB
1.3 Attenuation of 20 dB
1.4 Attenuation of 30 dB
1.5 Attenuation of 40 dB
1.6 Attenuation of 50 dB
1.7 Gain of 24 dB
1.8 Gain of 14 dB (24 dB ga..i wit
10 dB attenuation)
1.9
Automatic selection with 10 dB attenuation always inserted (usually only used in Tuned
R F Level measurements)
2. Audio Range Selection. Use this special function to set the display resolution for modulation
rncasurements. The Measuring Receiver's display resolution is dependent on the modulation being
measured and the detector being used. For example, in FM measurements, Special Function 2.4 can
only display 0.01
H z
resolution when the deviation being measured
is
less than 0.04 peak
kHz
and
when the
RMS
detector is selected. Because this special function is so complex, it is not described
in detail here. Refer to Airdio R m g c on page 3-21 1, for detailed tables for this function.
3-275
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