HP 8340B Manual page 321

5-18.
PULSE ADJUSTMENTS (Cont'd)
3.
Set
the pulse generator for
a
pulse width of
4
microseconds, a
pulse period of 10 microseconds,
and amplitude
=
+3
Volts high and
0
Volts low. Remember that
CHAN B is inverted and X5 MAG
is
on.
4. On the
OUT, press [INSTR PRESET].
Press
[PULSE] ON. Press [CW] and enter [5] [GHz].
Press
[SHIFT] [PWR SWP]
and
enter [0] [dBm]. Use
the
step keys
to
step
in
10 dB RF attenuation.
If
the
DUT does
not include an
RF attenuator, connect
a
10 dB pad to the RF output. Set A21R45 (ON
DELAY-INT), A21R47 (OFF DELAY),
and
A21R44 (ON DELAY-SYS) fully
counterclockwise. (See
Figure 5-65.)
Check that the DUT
is
leveled (the
UNLEVELED light
is
not
lit).
5.
Set the oscilloscope to
1 usec/Div. the CH A
trace should be similar to Figure
5-66.
ADJUST FOR SAME LEVEL
Figure 5-66. Typical
A26TP2 (DET)
Pulse
Waveform.
6. Adjust
A25R58
(BAL) control for best continuity (flat line)
across the pulse trailing
edge.
(NOTE:
A25 must
not be on an extender board when viewing
trace.).
SAMPLE AND HOLD TIMING ADJUSTMENT
7.
Set the pulse generator for
a
pulse width of 120
nanoseconds.
On the DUT, press
[SHIFT] [PWR
SWP]
and enter [-]
[1] [0] [dBm]. Then press [SHIFT] [SLOPE]
and use
the [STEP] keys to set
attenuator to —10 dB.
8.
Connect the DVM to A26TP3 (MOD
LVL).
Adjust
A21R45
(ON DELAY-INT) and A21R47 (OFF
DELAY) for the most negative
reading.
9.
Set the
DUT
controls as shown below:
a
Press
[SHIFT] [PWR SWP]
and use
[STEP]
keys
to set attenuator to -10
dB.
b.
Use keys
to
enter [0] [dBm].
c.
Press
[CW]
and enter
[5] [GHz]
10.
Set the oscilloscope
to
0.2 usec/DIV and adjust the Pulse Generator to
a
1
usec pulse.
Adjustments
HP 8340B/41B