HP HP 8566B, Adjustment Manual

Page: 242 / 405

11. Down/Up Converter Adjustments
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
FREQUENCY
) 21.4 MHz, 50
10 [
REFERENCE LEVEL
) -30
Connect the tip of the active probe to On the
second spectrum analyzer, press
LEVEL
]
and use the
DATA knob to position the peak of the displayed 2 1.4 MHz signal
near the top CRT graticule line.
On the second spectrum analyzer, key in 2
MARKER
(
PEAK SEARCH
]
and record the level of the displayed 21.4
MHz signal:
Signal level at
On the second spectrum analyzer, key in MARKER [al,
FREQUENCY
] 3
MHZ
.
Connect the tip of the active probe to On the
second spectrum analyzer, key in MARKER
[
PEAK SEARCH
]
and
record the level of the displayed 3 MHz signal:
Signal level at
The 3 MHz signal level at measured in step 12
should be 10.0 f0.6 lower than the 21.4 MHz signal level
at measured in step 10. If not, change the value
of factory-select resistor A 10% decrease in
the
of increases the signal level at by
approximately 0.6 Refer to Table 3-3 for the acceptable range
of values for and to 3-4 for HP part numbers.
Set the spectrum analyzer LINE
switch
to STANDBY.
Remove Down/Up Converter Assembly from the two
extender boards and reinstall in the IF-Display Section.
Set the spectrum analyzer LINE switch to ON and press
On the spectrum analyzer, key in [
CENTER FREQUENCY
) 100 MHz,
10 1 [
REFERENCE
-7
and press the LIN pushbutton.
On the spectrum analyzer, key in MARKER
(
PEAK SEARCH
),
MARKER 1 MHz.
Adjust WIDE GAIN for a MKR A indication of 1.00 X,
aligning the two markers on the CRT display. See Figure 3-51 for
the adjustment location.
Disconnect the spectrum analyzer CAL OUTPUT from the RF
INPUT.
On the spectrum analyzer, key in (
REFERENCE
-70
1 MARKER (OFF).
On the second spectrum analyzer, key in [
START
5
MHz, 50 MHz, 100
Adjustments