HP 8340B Manual page 58

4-12. PULSE MODULATION RISE AND FALL TIME (Cont'd)
2. Set up the HP 8012B Pulse Generator as follows:
OFFSET
POLARITY
OUTPUT
INT LOAD
PULSE PERIOD slide switch
TRANSITION TIME
AMPLITUDE slide switch
PULSE DOUBLE/NORMAL
PULSE
Pulse
LEADING EDGE control
PULSE WIDTH
TRAILING EDGE control
3. Set both oscilloscope channels A and B for SO 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 [INSTRPRESET] on both the DUT and the LO. On the DUT, press [CW] [1] [GHz] and the
[PULSE]modulation key. On the LO, press [CW]
MHz. Set the LO for +10 dBin or maximum leveled output. The DUT's RF power should be 0 dBm.
For best accuracy in this test, the Local Oscillator drive to the mixer
should be
5. Set the oscilloscope horizontal sweep to SO 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
X1O. The oscilloscope is now calibrated for S 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
slide switch
DELAY slide switch
Delay
VERNIER
slide switch
dBm.
= +4
[GHz].The IF frequency is then 50
[.] [9] [5]
NOTE
graticule line. Select the horizontal MAG
1000/a
OFF
NORMAL
IN
1~t in
minimum (Sn)
top position (S.0)
NORMAL
minimum
fully CCW
fully CCW
lOn—ip
fully CCW
HP 8340B/41B