HP 8566B Adjustment Manual page 242

11. Down/Up Converter Adjustments
) 21.4 MHz,
FREQUENCY
[
10 kHz,
REFERENCE LEVEL
9.
Connect the tip of the active probe to A4A6A2TP4. On the
second spectrum analyzer, press
DATA knob to position the peak of the displayed 2 1.4 MHz signal
near the top CRT graticule line.
10. On the second spectrum analyzer, key in (jj' 2 dB,
(
MARKER
PEAK SEARCH
MHz signal:
Signal level at A4A6A2TP4:
On the second spectrum analyzer, key in MARKER [al,
11.
] 3
FREQUENCY
12. Connect the tip of the active probe to A4A6A2Pl-9. On the
second spectrum analyzer, key in MARKER
record the level of the displayed 3 MHz signal:
Signal level at A4A6A2Pl-9:
13. The 3 MHz signal level at A4A6A2Pl-9 measured in step 12
should be 10.0 dB f0.6 dB lower than the 21.4 MHz signal level
at A4A6A2TP4 measured in step 10. If not, change the value
of factory-select resistor A4A6A2R33. A 10% decrease in
approximately 0.6 dB. Refer to Table 3-3 for the acceptable range
of values for A4A6A2R33 and to Table 3-4 for HP part numbers.
14. Set the spectrum analyzer LINE
15. Remove A4A6 Down/Up Converter Assembly from the two
extender boards and reinstall in
Set the spectrum analyzer LINE switch to ON and press C-1.
16.
17. On the spectrum analyzer, key in
10 kHz,
On the spectrum analyzer, key in MARKER
18.
MARKER Ia], (jj- 1 MHz.
Adjust A4A6AlR29 WIDE GAIN for a MKR A indication of 1.00 X,
19.
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
20.
INPUT.
On the spectrum analyzer, key in
21.
On the second spectrum analyzer, key in
22.
MHz, CsTopFREQ) 50 MHz, IjREs) 100 kHz.
)
-30 dBm.
LEVEL
]
and record the level of the displayed 21.4
.
MHZ
[
PEAK SEARCH
switch
to STANDBY.
the IF-Display Section.
[
CENTER FREQUENCY
[
1 kHz,
REFERENCE
(
PEAK SEARCH
(
REFERENCE
50 kHz, fj'j]
]
and use the
]
and
the
)
100 MHz,
-7
),
-70 dBm,
5
START