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In
the
square
wave
mode,
the
duration
is automatically
set to approximately
50%
of the
period
setting.
Output
Levels
The
output
amplitude
and
offset
are
selected
by
independent
pulse
HIGH
LEVEL
and
pulse
LOW
LEVEL
controls.
Use
the
front
panel
voltage
calibration
marks
when
the
load
resistance
is 50 ti.
and
the
back
termination
is not.
used.
The
output
voltage
is one
half
of the
voltage
indicated
by
thedial
calibration
when
the
back
termination
is used.
The
OUTPUT
(VOLTS)
controls
are interlocked
50
that
it is impossible
to set
the
HIGH
LEVEL
control
more
negative
than
the
low
level.
It is also
impossible
fo set
the
controls
for
more
than
about
5.5
V P-P outpuf
amplitude
into
50 Il.
Pulse
amplitude
always
equals
the
pulse
high
level
minus
the
pulse
low
level.
Offset
may
be the high
level
or the
low
level,
whichever
is used
as rhe
baseline
reference
level.
The
flexibility
of
this
method
of
controlling
the
output
amplitude
and
offset
is useful
in certain
applications
such
as logic
testing,
i.e.. cither
the
hiqh
or low
level
can
be
varied
wifhout
disturbing
the other.
Instructions-PG
502
OPERATI
NG MODES
Period and Duration
Selection
The
period
generator
free
runs
at the
rate
5et
by
the
PERIOD
selector
and
the
PERIOW
VARIABLE
control
in
all
modes
except
SO
WAVE
and
EXT
DURATION.
The
duration
of
the
output
pulse
is
set
by
the
PULSE
DURATION
selector
and
its
associated
PULSE
DURA.
TION
VARIABLE
control.
The
PERIOD
and
PULSE
DURATION
selectors
are
mechanically
coupled,
so
the
duty
factor
cannot
exceed
50%
with
the
VARIABLE
controls
in
the
Xl
positions.
Under
most
circumstances.
duty
factors
far
in except
of
the
specified
50%
may
be
obtained
in
the
NORM
mode
using
the
VARIABLE
controls.
Excessive
duty
factor
is indicated
by
any
of the
following
pulse
abnormalities:
(1)
pulse
output
period
in
multiples
of
the
trigger
output
period,
and
(2)
alternate
pulses
with
durations
less than
the
pulse
duration
setting.
Wuty
factors
approaching
100%
may
be
obtained
by
switching
to
the
complement
mode.
Set
the
PULSE
DURATION
control
for
a pulse
width
equal
to thedesired
pulse
off
time
and
push
the
front
panel
COMPLEMENT
(-1
pushbutton.
Use
of
the
Inormal
complement
function
allows
inter-
changing
the
pulse
on-off
times
without
varying
the voltage
ICVPIS.
External Trigger
The
period
generator
is disabled
when
the
PERIOD
selector
is
in
the
EXT
TRIG
position.
An
external
positive-going
signal
applied
to
the
TRIG/DURATION
IN
connector,
triggers
the
duration
generator.
The
pulse
duration
of
the
output
pulse
varies
with
the
front"panel
Pulse
DURATION
selector
and
VARIABLE
CQtltlOl.
The
period
of
the
output
waveform
is the
period
of
the
triggering
signal.
See
Fig.
l"4.
The
external
trigger
signal
must
remain
above
the
recognition
threshold
for
at
lwst
2 ns.
It must
also
remain
below
the
reset
threshold
for
at
least
2 ns to reset
the
generator
for
the
next
trigger.
Entwnal
Trigger
Signal
A manual
trigger
is available
for
single
pulse
operation.
Disconnect
any
external
trigger
input
when
not
in use.
External
Duration
The
period
generator
and duration
generator
are disabled
when
the
DURATION
selector
is in the
EXT
DURATION
position.
A voltage
exceeding
the
recognition
level
applied
to
the
TRIG/OURATION
INPUT
connector
will
activate
the
outpuf
of the
PG 502.
The
period
and
duration
of the
output
will
depend
on
the
period
and
duration
of
the
externally-applied
voltage.
See
Fig.
1.5.
When
operating
in
this
mode,
the
output
of the
PG 502
is activated
as long
as
the
MAN
TRIG
pushbutton
is depressed
1-5
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