HP 3585A Service Manual page 78

Model 3585A
Specification:
Procedure:
a. Disconnect all inputs to the 3585A.
b. Set the 3585A controls for:
c . Read the marker amplitude. The reading should be less than - 1 5 dB.
d. Record the marker amplitude reading under zero response on the Operational Verifica­
tion Test Card.
4-22. Low Frequency Responses
Within the 3585A there are several frequencies which may be picked up by the sensitive
analog circuits. These frequencies include:
·or other power line frequency.
These frequencies and their harmonics will be used to verify that all Low Frequency
Responses are less than - 1 20 dBm.
Specification:
Procedure:
a. Disconnect all inputs to the 3585A.
b. Set the 3585A controls for:
<
LO Feed Through - 1 5 dB below range
INSTRUMENT PRESET
RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 dBm
MANUAL SWEEP . . . . . . . . . . . . . . . . . . . . . . O Hz
60 Hz· Power Line
5 kHz AID clock
20 kHz (approx) Power Supply Switching Oscillator
25 kHz (approx) CRT High Voltage Oscillator
1 00 kHz Fractional N Clock
1 MHz Fractional N Step Loop Clock
10 MHz Internal Reference
<
Residual Responses -120 dBm
INSTRUMENT PRESET
REFERENCE LEVEL . . . . . . . . . . . . . . . . . -75 dBm
RES. BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Hz
VIDEO BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Hz
MANUAL SWEEP . . . . . . . . . . . . . . . . . . . . . . . . on
Performance Tests
4-1 9