HP 8566B Adjustment Manual page 263

13. Sweep, DAC, and Main Coil Driver Adjustments
42.
Adjust A20R25 6.15 GHz to align nearest comb tooth with center
CRT graticule line.
43.
Key in (RECALL) 4.
44.
Adjust A20R34 2.3 GHz to align nearest comb tooth with center
CRT graticule line.
45. Repeat steps 41 through 44 until no further adjustments are
necessary.
46. Reconnect cable 8 (grey) to AllJl O/ DET OUT. Remove jumpers
from between A12TP2 and A12TP3 and between A20TP5 GND
and A21TP2. Connect
47.
Key in C-13.
48. Adjust A20R25 6.15 GHz for oscilloscope indication of 0.0 f0.2
Vdc.
49. Key in (RECALL) 4.
50. Adjust A20R34 2.3 GHz for oscilloscope indication of 0.0 f0.2
Vdc.
51. Repeat steps 47 through 50 until
necessary.
52. Disconnect the oscilloscope from A21TP2.
Key in
54. Connect synthesized sweeper RF OUTPUT to front-panel RF
INPUT with low-loss microwave test cable. Set synthesized
sweeper for output of 4000.000 MHz at 0 dBm.
55. Signal should be visible at right side of CRT display. Press
( ), MARKER C-1 to place display marker on
PEAK SEARCH
signal peak.
(
56. Alternately press
PEAK SEARCH
for marker frequency of 4.000 00 GHz as indicated by display
annotation.
If adjustment A16R72 GAIN 1 has insufficient range, perform
Adjustment Procedure 22, "Analog-To-Digital Converter Adjustments"
to ensure that adjustments A3ASR6 OFFS
properly set (for a 0.00 V dc to 10.00 V dc Scan Ramp). If adjustment
factory-select precision resistor A16R46, which has allowable values
of 74.25K (HP Part Number 0699-0311) or 73.874K (HP Part Number
0699-0380).
(
57. Key in 3784 MHz, [sTopFREQ) 4024 MHz.
START
58. Signal should be visible at right side of CRT display. Press
( ), MARKER (-1 to place display marker on
PEAK SEARCH
signal peak.
the oscilloscope channel 1 to A21TP2.
no further adjustments are
START FREQ
)
and adjust A16R72 GAIN 1
and
)
3928 MHz,
Adjustments 3-123