HP 8340B Manual page 59

4-12.
PULSE MODULATION RISE AND FALL TIME TEST
NOTE
THIS TEST IS NOT APPLICABLE TO INSTRUMENTS EQUIPPED WITH
OPTION 006, DELETE PULSE
MODULATION.
Specification
Table 4-25.
Pulse Modulation Rise and
Fall Time Test
Specification
For
CW
mode and frequencies
2:400 MHz only:
Rise (TF)) and
Fall (Tp) Times: <25
nanoseconds
Description
The DUT's RF output frequency
is
down converted to 50
MHz
using a
mixer and
a
local oscillator.
The
50
MHz
IF signal
is
amplified and applied to an oscilloscope. The DUT
is pulsed
using
a
pulse
generator. The pulse generator output is also applied to the oscilloscope. The oscilloscope is
used to
measure the
pulse envelope
rise and fall times.
Refer
to Figure
4-12 Pulse Definitions.
RF
PULSE OUT
INPUT
PULSE
-J
TBF-RF
TV
-Inpu
Tn -Dela
Vp
-RFF
1
90% ——
10%
50%——
100%——
———TO——
/
-————Ty-
Pulse
Length
t Pulse Lengt
yTime
'ulse Amplitu
^R
r
/
\-
'
•RF
-'
h
de
VQR
T
°R
^
'
1
-
^
J\
N
Tp
-RF
Pulse
Ri» Time
TF -RF
Pulse Fall
Time
VQn-Overshoot and
Ringing
Vp
-Video Feedthrough
:
4
iVp
--I-*
^r——
VF
/i
Figure 4-12. Pulse Definitions
HP 8340B/41B
Performance Tests