Vernier Dial; Volt - Fluke 893A Instruction Manual

2-1.
INTRODUCTION
2-2. This
section
of
the
manual
contains information
necessary
for
you
to effectively
operate your Model
893
AC/DC
Differential Voltmeter.
It
is
recommended
that
you thoroughly read and understand
this section
of
the
manual
before attempting
to
operate your instrument.
POWER
RANGE
NULLS
SENS
MODE
Readout
dials
ON/LINE
OPR
1000
TVM
+
000
.^
2-3. Should any
difficulties be
encountered during
the
operation
of
your instrument,
please
feel free to
contact
your nearest John
Flulce
Sales Representative
or write directly
to
the John Fluke Mfg.
Co.
,
Inc.
P.O.
Box
43210,
Mountlake Terrace, Wn.
98043, with a
statement
of
your problem.
A
complete
list of
Sales
Representatives
is
contained
at the
rear
of
tMs
manual.
2-4.
OPERATING
FEATURES
2-5. All
of
the controls, terminals, and indicators
for the
Model 893A and
the
Model 893AR
are
illustrated
and described
in
Figure 2-1 and Figure
2-2,
2-6.
OPERATION
FROM
115/230
VOLT
AC
POWER
LINES
2-7.
The Model
893
may
be operated
from
either a
115 or 230
volt ac
power
line.
The
input
power
trans-
former primary
is
composed
of
two windings
which,
when
connected
in
parallel, allows
the
instrument
to
be
operated
from
a
115
volt ac
power
line or,
when
the
windings are connected
in
series, allows the instru-
ment
to
be
operated from
a
230
volt
ac
power
line.
2-8.
A
rear panel 115/230
slide
switch
(S5)
provides
the
necessary power
transformer primary
winding con-
nections
when
placed
to
the desired 115 or 230
volt
position.
2-9.
PRELIMINARY
OPERATING PROCEDURES
2-10. Connect
the
Model
893
power
cord
to available
line
power.
If
your instrument does
not contain the
-01
option,
perform
only step
a.
If
your instrument
contains
the -01
option,
perform
steps a
through
c.
WARNING!
The
instrument case
is
connected
to
the
round
pin
of
the
three-prong connector
located on the
power
cord.
Whenever
the
instrument
is
operated from
ac
line
power,
ensure
that this
round
pin
is
connected
to
a
high quality earth
ground.
a.
Place
the
instrument controls as follows and allow
at
least
one minute
of
circuit stabilization
before
attempting
any measurements.
2/10/75
The Readout
dial
labeled OO
in
the preceding
step,
represents
the
extreme
right-hand
vernier
dial.
b. Place the -01 option equipped instrument
POWER
switch
to
BAT
CHK,
observing
that the
meter needle
deflects
to
the
left of
the
-, 2 volt
increment.
If
the batteries are adequately charged,
the instru-
ment can
be operated on battery
power by placing
the
POWER
switch
to
either
BAT OPR
or
BAT
OPR/LINE
ISOL.
To
completely
isolate
your
in-
strument from
the line
power
ground, disconnect
the
power cord from
line
power.
c.
If
the
BAT CHK
test
results
in a deflection
of
less
than
.
2 volts
on
the
meter, place the
POWER
switch
to
BAT CHG
and operate
the
instrument from
line
power
until
the batteries are adequately charged.
All
measuremaits can
be
performed during recharg-
ing
of
the batteries. Should the batteries
fail
the
BAT CHK
test after
16 hours
of
recharging, replace-
ment
of
the batteries
may
be
necessary. Refer
to
Section
IV,
paragraph 4-19 and 4-20
for battery re-
placement
instructions.
Battery manufacturers
recommend
that
nickel-
cadmium
batteries
should
not be stored
for
extended periods
of
time
without recharging
at
least every 90 days. Storage temperatures
below
25'^C
are
recommended.
2-11.
OPERATIONAL
TEST
2-12.
The
following information
is
provided
for the
operator
to
initially verify
instrument operation.
These
tests
will only
check
relative
instrument operation and
are not intended as instrument
performance
checks.
Should you wish
to
check the
accuracy
of the instru-
ment
against
the specifications contained
in
Section
I,
refer
to
the Performance Checks contained
in
Section
rv
of this
manual.
2-13.
To
determine
relative
instrument
operation,
perform
the
operations described
in
the
Preliminary
Operating Procedures (paragraphs 2-9 and
2-10) and
proceed as
follows:
a.
Place
the
RANGE
control
to
1.
2-1
A