Location Of .L Db Gain Step, 18.4 Mhz Lo, And + 1Ov - HP 8568B Performance Tests And Adjustments Manual

10. Step Gain and 18.4 MHz Local Oscillator Adjustments

Location of .l dB Gain Step, 18.4 MHz LO, and + 1OV

36. Key in
[
FREQUENCY
[ SEARCH] a].
PEAK
37. Adjust front-panel FREQ ZERO control fully clockwise. Press
Signal should move at least 60 Hz away from
].
SEARCH
center CRT graticule line.
38. Adjust front-panel FREQ ZERO control fully counterclockwise.
Press
[
PEAK
center CRT graticule line.
39. If proper indications are not achieved, increase or decrease
value of A4A5C9 and repeat adjustment from step 33. Refer to
40. Press and IRECALL) @.
)
PRESET
41. Adjust front panel FREQ ZERO to peak the signal trace on the
CRT.
+ 1OV Temperature Compensation Supply Adjustment
42. Connect DVM to A4A5TPl (+ 1OVF).
43. If DVM indication is between +9 V dc and 10.0 V dc, no
adjustment is required.
44. If DVM indication is not within tolerance of step 43, adjust
normal room temperature of approximately 25°C. Voltage change
is approximately 30 mV/OC. Therefore, if room temperature is
higher or lower than 25OC, adjustment should be made higher or
lower, accordingly.
Figure 3-49.
Adjustments
1 kHz, [REs] 100 Hz, and
Signal should move at least 60 Hz away from
" R
Z E R O C O A R S E C9
Adjustments 3-91