HP 8566B Adjustment Manual page 211

C
6. Press LOG
ENTER
7. Set the frequency synthesizer for 7.6000 MHz at +5.0 dBm outpu
level.
8. Adjust A4A3C55 CTR for maximum DVM indication. See
Figure 3-34 for location of adjustment. If A4A3C55 is at an
extreme of its adjustment range (fully meshed, maximum
capacitance, or unmeshed, minimum capacitance), increase or
decrease value of A4A3C52 and A4A3C53. Refer to lhble 3-3 for
range of values.
If A4A3C55 is fully meshed, increase the value of A4A3C52 or
9. Connect one end of a jumper wire to A4A3TP8. Connect the
other end of the jumper to A4A3TP7 (+ 15V). Connecting the
jumper to A4A3TP8 first reduces the chance of shorting the + 15V
to ground. Note DVM indication.
10. Remove the jumper from between A4A3TP7 and A4A3TP8.
11. Adjust A4A3R67 AMPTD for DVM indication the same as that
noted in step 9 f0.0005 V dc. See Figure 3-34 for location of
adjustment. If unable to adjust A4A3R67 AMPTD for proper
indication, increase or decrease value of A4A3R66. (If A4A3R67
is fully counter-clockwise, increase the value of A4A3R66.)
Refer to 'Ihble 3-3 for range of values.
12. Repeat steps 9 through 11 until DVM indication is the same
f0.0005 V dc with A4A3TP7 jumpered to A4A3TP8, and with
13. Press the LIN pushbutton.
14. Adjust frequency synthesizer output level for DVM indication
of + 1.000 f0.0002 V dc, and note the frequency synthesizer
amplitude setting.
Frequency Synthesizer output level:
Press LOG [ENTER dB/DIV).
16. Wait three minutes for the A4A3 Log Amplifier-Filter and A4A2
Log Amplifier Detector to stabilize.
17. Decrease the frequency synthesizer output level by 50 dB.
18. Adjust A4A2R91 -12 VTV for DVM indication of +500 fl mV dc.
See Figure 3-34 for location of adjustment.
19. Increase the frequency synthesizer output level by 50 dB (to the
level of step 14).
5. Log Amplifier Adjustments
Adjustments 3-71
V dc