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Model
8902A
Operation
IF Output
Do
not apply griwtcv than
40
Vdc or
greater
than +I5 dBtn into the rear-panel
IF
OUTPUT
conncwor.
DESCRIPTION
The rear-panel IF OUTPUT (a female
BNC
connector) provides a buffered output to enable
monitoring of the Measuring Receiver's IF signal. The ac-coupled signal ranges from 150 kHz to
2.5 MHz and normally varies in level from -27 to -3 dBm (into 50 ohms). The level variation
depends on the RF input signal level, RF input attenuation or gain setting, and the measurement
selected.
The 3 dB bandwidth of the signal at IF OUTPUT is approximately
3 MHz
when the instrument
uses the wide, 2.5 MHz low-pass filter; approximately 200 kHz when the instrument uses the wide,
455 kHz bandpass filter; and approximately 30 kHz when the instrument uses the narrow, 455 kHz
bandpass filter.
At any particular input level and front-panel setting, the flatness of the IF OUTPUT, as input
frequency varies, is typically within f5%.
BLOCK DIAGRAM
TO OTHER
b
MEASUREMENT
10 dB
INPUT
CIRCUITS
k$y!
I F A M P
IF BUFFER
I------
.
IF OU_TLUT
2
LOCAL
Il:
Oirfpirt Block
Diagram
3-
129
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