Fluke 845A - Page 10

I
METER
Indicates the
voltage
o|
input
terminals
845AB POWER
switch is
OFF:
power
removed from the
instalment.
LINE OPR:
instrument
operates
on
line power.
BAT
GHG LINE OPR: instrumenr
operates
on
line
power while
batteries
are being charged.
BAT
CHK;
meter indicates
charge
state
of batteries.
BAT
OPR: instrument operates on
internal batteries.
ipplted
to
the
When the
Model
placed to
BAT CHK
position,
the meter
indi-
cates
the charge state of
the
internal
batteries.
ZERO: opens input terminal
and
shorts
amplifier
input,
allowing
zeroing of instru-
ment.
OPR: instrument is ready for
operation
as a
voltmeter
or null
detector.
Screwdriver
adjustment
used to
set
the meter to
zero.
INPUT
AND
COMMON
Provides
connection to
voltage
being
measured.
This terminal is
usually
strapped
to
the common terminal.
The
terminal is connected
directly
to an
inner
chassis shield. By
removing the
strap, a guard
potential may be
applied
to
the guard
terminal,
shunting
the
leakage
current from the
common terminal to
ground.
For
full-scale
meter deflection,
this control provides
adjustment
of the isolated
output voltage
from 0
to 1
volt dc„
RANGE CONTROL
Provides
selection
of
the
desired
full-scale
voltoge
sensitivity.
g
ISOLATED
OUTPUT TERMINALS
Provides connection to an external
g|
recorder.
Figure
2-1. CONTROLS,
TERMINALS,
AND
INDICATORS
2-2