HP 8340B Manual page 62

4-12.
PULSE MODULATION RISE AND FALL TIME (Cont'd)
2.
Set
up the
HP 8012B
Pulse Generator as follows:
OFFSET
...........................................................
OFF
POLARITY
..........................................................+
OUTPUT
.....................................................
NORMAL
INT LOAD
...........................................................
IN
PULSE PERIOD
slide switch
.......................................
1p-.1m
TRANSITION TIME
slide switch
................................
minimum (5n)
AMPLITUDE
slide switch
...................................
top position (5.0)
PULSE DOUBLE/NORMAL
.......................................
NORMAL
PULSE DELAY
slide switch
.......................................
minimum
Pulse Delay
VERNIER
...........................................
fully CCW
LEADING EDGE
control
.........................................
fully CCW
PULSE WIDTH
slide switch
........................................
-lOn-lp
TRAILING EDGE
control
.......................................
fully CCW
3.
Set both oscilloscope channels
A
and
B for 50 ohm input. Set
the oscilloscope to view the
pulse
generator output waveform. Adjust the HP 8012B pulse
width
VERNIER
for
a
100
nanosecond
pulse. Adjust the pulse period
VERNIER
for
a
10
microsecond period.
Adjust the amplitude
VERNIER
for about
a
3V
pulse amplitude
(TTL
level).
Set the oscilloscope to
trigger on
this
pulse (trigger on channel
B).
4. Press
[INSTR PRESET]
on both the
DUT
and the LO. On the
DUT,
press
[CW] [1] [GHz]
and the
[PULSE]
modulation key.
On the LO, press
[CW] [.] [9] [5]
[GHz]. The IF
frequency is
then 50
MHz.
Set the LO for +10
dBm
or maximum leveled output.
The DUT's RF power
should be
0
dBm.
NOTE
For best accuracy
in
this test, the Local Oscillator drive
to the mixer
should be
2:
+4
dBm.
5.
Set the oscilloscope horizontal
sweep
to
50 nanoseconds/division
and select channel
A
input
only. Adjust the channel A
(pulsed IF input signal) vertical gain and position so that the pulse OFF
is at the
0%
graticule
line and the
pulse
ON
is
at
100% graticule
line.
Select the horizontal
MAG
X10. The oscilloscope
is now calibrated for
5
nanoseconds/division, Adjust the horizontal position
control to position the modulation envelope so that the 10% point of the envelope
rise
time is at the
center
vertical graticule
line similar
to Figure
4-14.
4-60
Performance Tests
HP 8340B/41B