--
button
is
pressed in; the READY
LED
is
turned
on
when the filling
is
completed. The storage acquisition
system
is
then ready to accept a triggering event.
The READY
LED
is
turned off after
an
acquisition
is
completed.
@ A TRIGGER LEVEL Control-Selects the amplitude
point
on
the A Trigger signal that produces trigger-
ing. The trigger point for STORE mode
is
identified
by a T
on
the acquired waveform.
@ HF REJECT
Switch-Rejects
(attenuates) the high-
frequency components (above
40
kHz) of the trigger
signal when the control
is
in
the
ON
posiltion.
@ A TRIGGER
SLOPE
Switch-Selects
either the
positive or negative slope of the trigger signal to
start the
NON
STORE A Sweep or to reference the
next STORE mode acquisition cycle.
@
A&B
INT
Switch-Determines
the source of the
internal trigger signal for both the A
and
the B
Trigger Generator circuits.
CH
1-Trigger
signal
is
obtained from the
CH
1
input.
VERT
MODE-
Trigger signal
is
obtained alter-
nately from the
CH
1
and
CH
2 input signals if the
VERTICAL MODE
is
ALT.
In
the CHOP or ADD
vertical modes, the trigger signal
is
the
sum
of the
CH
1
and
CH
2 input signals.
CH
2-
Trigger signal
is
obtained from the
CH
2
input. The
CH
2 INVERT switch also inverts the
polarity of the internal
CH
2 trigger signal
so
the
displayed slope agrees with the Trigger SLOPE
switch.
@ A SOURCE
Switch-Determines
if the SOURCE of
the A Trigger signal
is
internal, external, or from
line.
INT
-Routes
the internal trigger signal selected
by the A&B INT switch to the A Trigger circuit.
LINE-Routes
a sample of the
ac
power source
to the A Trigger circuit.
EXT
-Routes
the signal applied to the
EXT
INPUT connector to the A Trigger circuit.
Controls, Connectors, and
lndicators-2230
Operators
@ A EXT COUPLING
Switch-Determines
the method
of coupling the signal applied to the EXT INPUT con-
nector to the input of the A Trigger circuit.
AC-Input
signal
is
capacitively coupled,
and
the
de
component
is
blocked.
DC-All
frequency components of the external
signal
are
coupled to the A Trigger circuit.
DC---:-10-Attenuates the external signal
by
a fac-
tor of
10
before application to the A Trigger cir-
cuit.
As
with
DC
COUPLING,
all
frequency com-
ponents of the input signal are passed.
@ EXT INPUT Connector-Provides for connection of
external signals to the A Trigger circuit.
@ B TRIGGER (INT SOURCE ONLY) SLOPE
Switch-Selects
either the positive or the negative
slope of the B Trigger signal that starts the
NON
STORE sweep or completes the STORE acquisition.
@
B TRIGGER LEVEL Control-Selects the amplitude
point
on
the B Trigger signal where triggering occurs
in
Triggerable After Delay mode.
The
B Trigger point
is
displayed
as
a T
on
the STORE mode waveform
display when
in
B Horizontal mode. The fully clock-
wise position of the B TRIGGER LEVEL Control
selects the Runs After Delay mode of operation for
the B Trigger circuitry. Out of the cw position, B
Sweep
is
triggerable after the delay time.
VAR HOLDOFF
Control-Adjusts
the
NON
STORE
Variable Holdoff time over a
10
to 1 range.
NON
STORE Variable Holdoff starts at the
end
of the A
Sweep. STORE mode Holdoff starts at the
end
of
the acquisition cycle,
and
ends after the waveform
data has
been
transferred from the acquisition to the
display memory
and
the pretrigger portion of the
acquisition memory has
been
filled. After STORE
mode Holdoff ends, the next acquisition
can
be
trig-
gered after the next (or current, if
one
is
in
progress)
NON
STORE Variable Holdoff ends. STORE mode
Holdoff may
be
many times the length of the A
Sweep time so that several
NON
STORE Holdoffs
may occur during STORE Holdoff time. This ensures
that STORE mode triggering
is
controllable by the
VAR HOLDOFF control
and
will
be
stable if the NON
STORE display
is
stable.
3-11
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