HP 3585A Service Manual page 77

Performance Tests
4·20. Noise
This test is used to determine the average noise level in each of the resolution bandwidths.
Specification:
501750 input, -25dBm Range
Procedure:
a. Disconnect all inputs to the 3585A.
b. Set the 3585A controls for:
c. Read the marker amplitude. Take an average of the readings displayed. This average
value should be below the test tolerance shown by the specifications listed.
d. Record the average noise reading, across from the BW displayed, on the Operational
Verification Test Card.
e. Set the 3585A controls for:
f. Repeat Steps c thru e until all Resolution Bandwidths have been measured for their
average noise level.
4·2 1 . Zero Response
This test measures the amplitude of the local oscillator feedthrough. This response occurs at
o
Hz due to the local oscillator passing directly through the IF section.
4-1 8
Res. BW
30 kHz
10 kHz
3 kHz
1 kHz
300 Hz
100 Hz
30 Hz
10 Hz
3 Hz
INSTRUMENT PRESET
CENTER FREQUENCY . . . . . . . . . . . . . 9.35 MHz
REFERENCE LEVEL . . . . . . . . . . . . . . . . . -75 dBm
RES. BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 kHz
VIDEO BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Hz
MANUAL SWEEP . . . . . . . . . . . . . . . . . . . . . . . . on
RES. BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specification
- 1 00 dBm
-104 dBm
-108 dBm
- 1 1 1 dBm
- 1 1 5 dBm
-122 dBm
-127 dBm
- 1 32 dBm
-137 dBm
[2JJ
Model 3585A