HP 8510 User Manual

9
Using External Triggering and Pulse Modulation
In applications where it is necessary to maintain close control over the PRP and duty
cycle of the pulsed-RF stimulus, you can use external equipment to provide the TTL pulse
mo dulation and external trigger signals. When using an external pulse mo dulation signal,
it is necessary to synchronize the network analyzer with the pulse mo dulation signal so
that the measurement is always made at the same time with resp ect to the stimulus. This
synchronization is accomplished using the HP 8510 external trigger input.
Connect
the
Pulse
Generator
A
simple metho
dto
control
the
PRP
and
dut
y
cycle
of
the
pulsed-RF
stim
ulus
is
to
use
an
external
pulse
generator
to
pro
vide
the
pulse
mo
dulation
input
to
the
RF
source.
Figure
9-1
sho
ws
a
simple
setup.
In
this
example
the
same
TTL pulse
train pro
vides
the
pulse
mo
dulation
input
to
the
RF source
and to
the
HP
8510
rear
panel
TRIGGER
IN
connector.
How
ev
er,
in
y
our
application
it
ma
y
b
e
desireable
to
use
dieren
t
sync
hronized
inputs
to
the
net
w
ork
analyzer
TRIGGER
IN
and
to
the
pulse
mo
dulator.
Please
note
that
for
in
ternal
triggering,
a
BNC
short
circuit
is
connected
to
the
TRIGGER
IN
connector.
When
the
pulse
generator
is
connected
to
TRIGGER
IN,
mo
v
e
the BNC
short
to
the
SWEEP
IN
0
to
10V connector.
Otherwise, signals
on
the
sw
eep
in
line
could
aect
triggering.
Using
External
Triggering
and
Pulse
Modulation
9-1

HP 8510 Specifications

General

Brand	HP
Model	8510
Category	Measuring Instruments
Language	English