Range Up Detector Adjustment; Range Down Detector Adjustment - HP 3585A Service Manual

Model 3585A
5·37. Range Up Detector Adjustment
a. Set the synthesizer controls for:
b. Set the 3585A controls for:
c. Adjust the RANGE UP THRESHOLD, AIRI73, so that the front panel OVERLOAD
light is lit. Now adjust A I R 1 73 so that the OVERLOAD light just goes out.
5·38. Range Down Detector Adjustment
a. Set the 3585A to the OdBm RANGE.
b . Set the synthesizer for an AMPLITUDE of -6dBm.
c. Connect a dc voltmeter (lOV range) to the Digital motherboard, pin A45B 1 9 or
A40TP2 ('L' RNGD). This is accessable from the bottom of the instrument as shown in
Figure 5-4 1 .
A 7 6
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30kHz
AMPLITUDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . -24dBm
RECALL 601
INSTRUMENT PRESET
RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25dBm
AUTO RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
@ @
o GND
I.ftNG U
TI'3
•
,p, L".D _
0
TI'1 o LTRIP
Figure 5·4 1 . Range Down Monitor Point (LRNGD)
A 4 0
358511-5-6
Adjustments
5-63