Model 214B
TP4
t
+
t
+
U2/13
U2
/
12
U2/9
U2/5
U
214
U2/2
U3/2
Figure
8-3-4.
Timing
diagram in
double
pulse mode
Advanced
With
advance selected, the
TRIGGER
OUT
signal
is
generated
by
the positive
edge
on the signal
at TP4, the
width
'start'
signal then being generated
by
the negative edge. The prevailing
conditions
in this setting
are
:
- a high on U1B /pin 9
- a high on U3B /
pin
7 thus disabling gate U3B.
Because U1B/
pin
9
is
high, the
output
stages
of
U1B are reverse
of
those in
DELAY
mode.for
the
same
TP4
signal.
As
a result, the negative-going
edge
on
the TP4 signal generates the 4
ns
width
'start'
pulse
(the
4
ns
being determined
by
the delay action
of
U1A
and U2B).
After
a
time
determined
by
the
DELA
Y setting, the TP4 signal
goes
positive, causing the
TRIGGER
OUT
pulse
to
be
generated via U1C, U2C, U3C and trigger
amplifier
016
/
020.
A
timing
diagram
indicating the logic sequence in advance mode
is
given in Figure 8- 3-
5.
Service
L
TR
I
GGER
'vJIDTH
S
TART
'vJIDTH
START
8- 19
Scans by Artekmedia => 2009
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