HP 8340B Manual page 277

5-14.
UNLEVELED RF OUTPUT ADJUSTMENTS (Cont'd)
Adjust X2A CCW
to decrease
amplitude.
Adjust X2B CW
to
increase amplitude.
Figure 5-42.
Oscilloscope Display of SRD
Bias Waveform
14.
Disconnect the oscilloscope probe and reconnect the detector as shown
in
Figure 5-40. Set the
oscilloscope's
vertical sensitivity
(CHAN A)
to
0.5 V/Div. Readjust the
vertical position
and/or
sensitivity,
if
necessary,
to view the entire trace on the scope. Note
the position of the minimum
power point.
15. Press
[MANUAL]
on the DUT.
Adjust the front
panel rotary
knob until
the dot on the scope
is
near
the position noted as the minimum power point.
Slowly vary the position of the dot around
this
point while observing the
DUT's POWER dBm
display.
The minimum
power displayed
should be
>
1
dB above the maximum leveled
power specification for the DUT
in Band
2
(6.9
to 13.5 GHz).
If
this is
not the
case,
disconnect the detector
from the
DUT and connect the power meter
and
power sensor.
Again, slowly vary the rotary knob and determine
the power level of the minimum
power point.
If it
is
still
<
1
dB above the maximum
leveled
power
specification, press
[RECALL]
[1]
on the
DUT and repeat steps
9
through
15.
Band
3
Adjustments
16.
On the DUT, press
[START FREQ] [1] [3]
[.]
[3] [5] [GHz]
[STOP FREQ] [2]
[0] [GHz]
[COW]
[SAVE] [1]
Adjust the scope's
vertical position
and/or
sensitivity control to display
the swept RF output.
17. Adjust
A28R99 (BP1)
to peak
the
power
in the second
half
of the display. This pot may need to be
adjusted several turns before any effect is observed.
18. If
the trace goes off the oscilloscope display
in
the following adjustments, adjust the vertical
position and/or
sensitivity
controls to view the entire trace on the display.
Adjust
A24R6 (X3A) to optimize
the power
in the
first half of the display.
Adjust
A24R7
(X3B) to optimize the
power
in
the second
half of the display.
Adjustments
HP 8340B/41B