Agilent Technologies HP 8566B Spécifications Page 211

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5. Log Amplifier Adjustments
Bandpass
Filter
6. Press LOG CENTER dB/DIv).
Center
Adjustment
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.
t
Note
A4A3C52
is a fine adjustment, and
A4A3C53
is a coarse adjustment.
If
A4A3C55
is fully meshed, increase the value of
A4A3C52
or
A4A3C53.
Bandpass
Filter
9. Connect one end of a jumper wire to
A4A3TP8.
Connect the
Amplitude
Adjustment
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.
V dc
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
A4A3TP7
and
A4A3TP8
not jumpered. Remove the jumper.
-12
VTV
and
ATTEN
13. Press the LIN pushbutton.
Adjustments
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:
dBm
15.
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).
Adjustments 3-71
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