HP 8566B Adjustment Manual page 258

13. Sweep, DAC, and Main Coil Driver Adjustments
3-l 18 Adjustments
15. Perform this step only if the Al6 Scan Generator is P/N
85660-60134 or 85660-60034. (HP 85660AB with serial number
prefix 2235A or below.)
a. Connect DVM to A16TP3 and DVM ground to A16TPl GND.
b. Key in (jZZi%J SWEEP (SINGLE), (SHIFT) (RES)r (forces
spectrum analyzer to reset Scan Ramp to 0 Vdc after
single sweep).
C.
Press SWEEP (ZiYZXQ.
d. After sweep has completed, adjust A16R74 Scan Reset
OFFSET for stable DVM indication of
e. Repeat steps c through d until no further adjustment is
necessary.
f. Connect DVM to A16TP5 and DVM ground to Al6TP6 GND.
Key in
( )
FREQUENCY SPAN
2,
80
MHz, IsAvE_] 4.
h. Key in (-1 1 and note stable DVM indication after sweep
has completed.
i.
Key in (jj] 2 and note change in stable DVM indication
from previous step.
Adjust A16R75 Scan Width DAC OFFSET while alternating
between (-1 1 and [RECALL_) 2 so that stable DVM
indication varies less than 1 mVdc.
k. Connect DVM to A16TP8 and DVM ground to A16TP7 GND.
1. Key in C-1 3 and note stable DVM indication after sweep
has completed.
m. Key in @ZXiIiJ 4 and note change in stable DVM indication
from previous step.
n. Adjust A16R76 Integer Number Attenuator OFFSET while
alternating between [mj 3 and (j-1 4 so that stable
DVM indication varies less than 1 mVdc.
16. Perform this step only if the Al6 Scan Generator is P/N
85660-60188, 85660-60198, or 85660-60247. (HP 85660AB with
serial number prefix 2240A or above.)
a. Connect DVM to Al6TP8 and DVM ground to A16TP7.
b. Key in (2--22j, SWEEP [SINGLE], CSHIFT) (REsBWr (forces
instrument to reset Scan Ramp to 0 Vdc after each single
sweep).
c. Press SWEEP [SINGLEI).
d. After sweep is completed, adjust A16R62 RAMP OFFSET for
stable DVM indication of 0.0000 f0.0005 Vdc.
e. Repeat steps c through d until no further adjustment is
necessary.
0.0000
CENTER FREQUENCY
[SAVE) (
2.4 1,
FREQUENCY SPAN
) 240
MHz,
SPAN
each
f0.0005 Vdc.
)
4
) 260
MHz,
3, [ )
FREQUENCY SPAN