Agilent Technologies 83640B Service Guide

15.
Pulse Modulation
Video Feedthrough
(F
or
B-Series
Only)
Description
and
Procedure
In
CW,
at
sp
ecied
maxim
um
lev
eled
p
o
w
er,
the
synthesizer
is pulse
mo dulated
using a
pulse
generator.
The
syn
thesizer's
RF output
is ltered
(only the
video feedthrough
passes),
amplied, and
display
ed
on
an
oscilloscop
e.
Because
of
the
lo
w
amplitude
of
the
video
feedthrough,
a
preamplier
is
used
in
the
test
setup;
system
gain
m
ust b
e considered
when
making
this
measuremen
t.
When
video
feedthrough
is
expressed as
ap
ercentage,
the
follo
wing
equation
is
used:
Video
feedthrough
(%)
= [(video
Vp/carrier Vp)
x 100]/video
gain
1.
Preset
all
the
instrumen
ts
sho
wn
in
Figure
2-21
and
let
them
w
arm
up
for
at
least one
hour.
2.
T
o
ac
hiev
e
p
eak
po
w
er,
turn
on
RF
p
eaking:
4
USER
CAL
5
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
Tracking
Menu
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
NN
N
N
N
N
Peak
RF
Always
(asterisk
on)
3.
Connect
the
equipmen
t
as
sho
wn
in
Figure
2-21
with
the
pulse generator
connected
directly
to c
hannel
1
of
the
oscilloscop
e
(A).
Figure 2-21. Video Feedthrough Test Setup
Agilent 8360 Performance Tests
Pulse Modulation Video Feedthrough
2-71

Agilent Technologies 83640B Specifications

General

Brand	Agilent Technologies
Model	83640B
Category	Portable Generator
Language	English