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When
the
CONT
switch
is
releasee.
trigger
logic
is
in-
hibited
from passing any
trigger
signals
and
the tug-
ger
(lip-flop
output
is
held high
This
prevents
me
trig-
ger diodes
from conducting
and
the
generator loop
operates
continuously.
When
the
CONT
switch
is
pressed,
the
generator looo
is
held
at the
OV
baseline.
Pressing
the
TfliG/GATE
switch puts
the
instrument
in
triggered
mode
and
any
external or
manual
trigger
signals
al
the
trigger logic
input
will
be
transformed
into
a
narrow
pulse cor-
responding
to the low-to-high transition
o
I
the
trigger
input.
This
pulse sots
the
trigger
flip-flop
high
and
allows
Ihe
generator loop
to
run
When
the
tr.
angle
negative
peak
is
reached,
the
comparator
low-to-high
transition
clocks
the
trigger
Hip-Hop
low
and.
when
the
OV
baseline
level
is
reached,
the
generator loop again
stops
The
result
is
a
single
cycle
generated
after
the triggering signal
corresponding
to
0
to
360*
of
phase Successive
triggered
waveforms
always
start
at
Ihe
samo
0
* point.
Roloasmg
the
TRIG/GATE
switch puts
the
instrument
In
the
gated
modo
This
is
identical to
tho
triggered
mode,
except
tho
trigger
flip-flop
is
held high
for
the
full
duration
of the triggering signal
Tho
generator
produces
continuous
waveforms
during
the
time the
external
signal
Is
high
or the
manual
lugger swilch
is
held
tn
The
last
triggered
cycle
started
is
always
com-
pleted
and
successive gated
bursts
always
start
at the
0 #
point
When
sweep mode
is
selected
by
a
combination
of
the
mam
generator
in
continuous
mode
and
the
ramp
generator switches
set
to
SWP.
the
ramp
generator
is
enabled and
a
ramp
voltage
becomes
part
of
the
con-
trol
voltage
m
me
VCG
circuit to
control
me
main
generator frequency.
Ramp
period, variable
from
30
ms
to
1
mmute.
is
set
by
me
TIME
Control.
Ramp
generator output
is
buffered
to
drive the
sweep
output
and
VCG
circuit.
The ramp magnitude
suppling the
VCG
input
is
controlled
by
the
STOP
potentiometer.
Selecting the stop
switch
position
biases
the buffer
amplifier
to
a
level
equal
to the positive
peak
of the
ramp
(
+
V) In
this static
mode
the upper
sweep
limit
can be
set
by
me
STOP
Control
When
the
CONT
position of
the
SWEEP
switch
is
selected
the
ramp
generator
is
disabled
and
the
buf-
fered
ramp
is
disconnected from
ihe
VCG
input
The
GCV
(Generator Control Voitago) from
the
VCG
ci'Cu't
IS
a
resultant
voltage
from
me
throe
VCG
in-
puts:
dai.
VCG
IN
and
sweep ramp
This voltage
is
buffered
and
made
available
at
the
GCV BNC
4-2
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