Figure 9-1. External Control of PRP and Duty Cycle
Synchronization is assured because time equals zero seconds for each measurementcycle
is
dened
as
the
rst
falling
edge
of the
trigger
input
after
stop
sw
eep
is
ready
(high).
Figure 9-1
b
sho
ws
connection
of
an
external
pulse
mo
dulator
instead
of the
in
ternal
mo
dulator
in
the
RF
source.
Figure 9-2 sho
ws results using this pulse mo dulation and triggering metho d
when the
pulse mo
dulation input to the RF source is a con
tinuous train of 10 microseconds PRP
,50
percen
t dut
y cycle pulses. The same input is applied to TRIGGER
IN, and TRIGGERING
EXTERNAL is
selected.
9-2
Using
External
Triggering
and
Pulse
Modulation