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Fig.
ll
NEGATIVE
PULSE
GENERATOR
MODULE
The
negative
pulse
generator
module—tS
an
all-solid-
state
totem
pole
MOSFET
output
stage.
A
TTL
level
input,
applied
to
pin
1,
triggers
the
module.
The
input
source
is
either
pin
2
of
the
pulse
width
module
or
a
connector
on
the
back
panel
of
the
instrument,
selected
by
SW2.
The
output
pulse
width
is
equal
to
the
input
pulse
width
and
the
output
amplitude
is
equal
to
the
voltage
on
pin
4
(which
can
vary
between
0
and
-110V)
minus
a voltage
drop
due
to
the
module's
2 Ohm
output
resistance.
The
voltage
on
pin
4
is
controlled
by
the
PS-PN
module
which,
in
turn,
is
controlled
by
the
AMP
RANGE
SWITCH
(SW8)
and
the
AMP
FINE
potentiometer
(PT5).
Pin
4
is
bypassed
with
large
energy-storage
capacitors
to
minimize
droop.
The
module's
output
is
taken
from
the
SMA
connector
and
fed
into
SW8.
When
not
in
the
100V
range,
the
output
is
connected
to
one
of
several
T
attenuators,
depending
on
the
voltage
range.
When
SW9
is
in
the
NEG
position,
the
module
is
supplied
with
power
by
the
+24VDC
solder
terminal
on
the
rear
of
the
module.
The
MOSFET
transistors
(AVTECH
Part
No.
SL5T)
are
field
replaceable
and
are
accessed
by
removing
the
5
cm
x
10
cm
cover
plate
on
the
bottom
of
the
instrument.
The
two
SL5T
transistors
in
each
module
are
bonded
to
a copper
heat
sink
using
WAKEFIELD
TYPE
155
thermally
conductive
epoxy.
The
copper
heat
sink
is
attached
to
the
bottom
surface
of
the
-PG
module
by
two
2-56
screws.
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