HP 3585A Service Manual page 88

Model 3585A
e. Check the readings in the upper right-hand corner. They should read:
If the readings are not correct, set the OFFSET control OFF and continue at Step d.
f. Move the marker down the left side of the trace until a marker amplitude reading of
-3 .00 dB ± 0.02 dB (-60.0 dB ± 0.4 dB) is obtained.
g. Press ENTER OFFSET.
h. Move the marker to the right side of the trace until a reading of 0.00 dB ± 0.02 dB
(0.0 dB ± 0.4 dB) is obtained.
i. Read the value displayed as OFFSET. This value represents the frequency span between
the 3 dB (60 dB) points of the IF filter. The value obtained should be within ± 20070 of the
chosen bandwidth.
j . Record the OFFSET value in the 3 dB (60 dB) column, across from the appropriate
bandwidth, on the Operational Verification Test Card.
k. Set the 3585A controls for:
1.
Repeat Steps c thru k until all the 3 dB (60 dB) all bandwidth measurements listed on
the test card have been completed.
m. Now the 60 dB bandwidth measurements will be made. For the remainder of the band­
width tests use the values in parenthesis wherever they occur.
n. Set the 3585A controls for:
o. Repeat Steps c thru k.
p. Set the 3585A controls for VIDEO BW 10 Hz.
q. Repeat Steps c thru
test card.
OFFSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 Hz
OFFSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
RES. BW . . . . . . . . . . . . . . . . . . . .
.
FREQUENCY SPAN .
.
*Next value on test card.
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . 100 Hz
dB/DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB
RES. BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Hz
I
for the remaining 60 dB bandwidth measurements listed on the
.00 dB (O.dB)
. . . . . . . . . . . . *
.
. . . . . . . . . . . . . . . . . . . . .
.
Performance Tests
*
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