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SECTION 3
LOCAL OPERATION
3.1
INTRODUCTION
3.1.1
This
section contains information
for
operating the 1994
as
a
bench
instru-
ment.
It
provides
General Operating
Information, Front
and Rear Panel
Descriptions,
and Operating Procedures.
3.2
GENERAL
OPERATING INFORMATION
3.2.1
If
the
counter
is
being used
for
the
first
time
or at
a
new
location,
ensure
that the
voltage selector
is
set for the
correct
local
AC
supply before turning
on the
instrument.
Refer
to
Subsection
2.7.2,
as required, for
details
on
line
voltage selection.
3.2.2
Power-On
and
Self
Test
3.2.
2.1
Depress the
POWER-ON/OFF
button
to
its
ON
(.«.)
position.
Power
should
now
be
supplied
to
the
entire
counter.
3.
2. 2.
2
After a
brief
self-test, the
counter
will
display the
instrument
number
(1994)
for
approximately
two
seconds followed by
the
software
issue
number.
3.2.3
Home
State
3. 2.
3.1
After
self-test,
the
counter
reverts
to
a
home
state,
ready
for
operation.
The
following
home-state
conditions are selected after
"self-test":
a.
Manual
Trigger
levels
A
and
B
(O.GGV):
enabled
b.
Time
Interval
DELAY:
set at
200
jus
(min. value)
(Verify using
key
sequence
SHIFT
RECALL
DELAY)
c.
GATE
Time:
100
ms
(Verify using
key
sequence
SHIFT
RECALL
GATE)
d.
Math
constants X, Y, and
Z:
0, 1, 1,
respectively
NOTE
The
user
may
set
math
constant
Z
to zero.
However, any attempt
to
use the
math
function
with
this
value
set
will
cause
the
generation of an
error code.
e.
FREQ A
(8-digit resolution):
enabled
f.
Attenuation:
IX
g.
Input
Impedance: 1M£2
for
Inputs
A
and
B
h.
Separate
inputs
(i.e.,
Common LED A
is
off)
i.
Filter:
off
j.
Slopes
A
and
B: positive
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