HP 3468A - Trigger Modes Explained

Triggering
is
simply
the
process
that
causes
the
3468A
to
take
a
reading.
There
are
two
triggering
modes
available
on
the
3468A.
These
are
internal
trigger
and
single
trigger.
The
3468A
can
also
be
triggered
remotely
from
a
calculator.
Internal
Trigger
(ee
|
In the internal trigger mode the 3468A triggers itself to take readings at the max-
imum possible rate. This mode is automatically selected at instrument turn-on and
after performing Self Test. A settling delay has been added before each A/D con-
version in ac volts and current and the two highest ohms ranges to ensure ac-
curate readings.
Command
T1
Selects
the
Internal
Trigger
Mode
Single
Trigger
The
single
trigger
mode
allows
you
to
manually
trigger
the
voltmeter
from
its
front
panel. The first time you press the Single Trigger key the 3468 will take one
reading,
display
the
results,
and
idle
in
the
single
trigger
mode.
Subsequently,
each
time
the
key
is
pressed
the
multimeter
will
make
one
reading,
display
the
result,
and then idle, waiting for another trigger.
This
sample
and
hold
feature
is
useful
when
you’re
making
measurements
in
tight
areas
where
the
probe
must
not
slip.
What
you
do
is
this:
press
the
Single
Trigger
key and position your finger to press the key again. You can then place the probe,
press the Single Trigger key, and then remove the probe, all without taking your
eyes
off
of
the
probe.
With
the
probe
safely
removed,
the
measurement
is
still
held on the display.
When
the
3468A
is
in
the
Single
Trigger
mode
and
you
change
ranges
or
change
function,
the
left
hand
portion
of
the
display
will
go
blank
(with
the
exception
of
the decimal point) until another trigger impulse is received.
Command
T2 Selects the Single Trigger Mode
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