Fluke 893A - Page 21

©
GROUND TERMINAL
Provides for connection
to
earth ground, provided of
course
that the line cord is
connect-
ed to available line
power.
©
INPUT TERMINALS Provide connection to the measured voltage
source.
©
MECHANICAL
ZERO CONTROL
Allows mechanical
zeroing of the meter.
Figure
2-1
.
THE MODEL 893A CONTROLS, TERMINALS, AND INDICATORS
(Sheer 2 of
2)
MODE SWITCH
Selects the AC or DC
mode of
operation. This switch
should be placed to the
*
position
on
the DC TVM
mode.
The
± positions provide
a meons of reversing the internal refer-
ence supply
voltage on
the dc
differential mode.
READOUT
DIALS Provide on
in-line digital readout of the
measured voltage when the
Instrument is
operated on the
differential mode.
POWER
SWITCH
Controls application of input power to the
insturment. When placed to
the
LINE OPR
position, the instrument Is operoted
from
the
available line power. On instruments equip-
ped with
the 01 Option, additional switch positions
of BAT
CHK,
BAT OPR-LINE ISOL,
and LINE OPR-BAT CHG
are Included, When
placed
to
the BAT
CHK
position, the front
panel
meter Indicates the charge condition of the
battery pack. A meter indication of at
least
-.2 is required before the instrument is to be
operated from the battery power.
When
placed
to
the BAT OPR-LINE iSOL position,
the instrument is
operated from battery
power and the
power transformer Is completely
disconnected from line power.
However,
to completely isolate
the instrument circuitry from
power line ground, the line power
cord
must be
disconnected. When placed to the LINE OPR-BAT
CHG position, the instrument
is operated from the
line power and the battery pack is
being charged.
NULL
SENS
SWITCH Provides selection
of the TVM mode of operation
and selection of
the
various full-scale
null
detector sensitivity ranges when the
iristrument is operated
on
the differential mode.
RANGE SWITCH Allows selection
of the
desired
input
voltage range
of
the instrument, while at the same
time simultaneously
positioning the
readout dial decimal point
and
selecting the avail-
able ranges of the
NULL SENS switch.
MECHANICAL
ZERO CONTROL
Allows
mechanical zeroing of the meter.
GROUND
TERMINAL Provides for
connection to earth ground,
provided
of
course that
the line cord is connect-
ed to available
line power.
INPUT TERMINALS Provide connection to
the measured
voltage source.
Figure
2-2.
THE MODEL 893AR CONTROLS, TERMINALS,
AND INDICATORS
(Sheet 1 of
2}
SQ'JA