Sun Microsystems VAT-40 Quick Reference Manual

QUICK REFERENCE GUIDE
TESTING
6
AND
12
VOLT
STARTING
AND
CHARGING
SYSTEMS
Using Sun's
This condensed
procedure
will
detect
starting
and
charging problems, using manufacturer's
specifi-
cations with vehicle
at
normal
operating temper-
ature.
Tests can be
made
under
other conditions,
but standard
specifications
will
not
apply.
(Specifications
shown
here
are
for
12
volt
systems.) For
complete
test
information, consult
the
VAT-40
instruction manual.
CALIBRATION
AND HOOKUP
All
tests (except those
requiring the use
of the
FIELD SELECTOR)
can be
made
without
dis-
connecting any
vehicle leads
because
of the
tester's
clamp-on ammeter
pickup.
Ammeter
readings
will
be accurate as long as
the vehicle
battery voltage
is
4.5 volts or higher.
VAT-40
A.
Check
each
meter's
mechanical
zero.
Adjust
if
needed. See Figure
1.
B.
Rotate
the
LOAD
INCREASE
control
fully
counterclockwise
to
"OFF."
C.
Connect
the
tester
LOAD LEADS
to
the
battery
terminals,
Red
to positive, Black
to negative.
D. Set the
VOLT SELECTOR
to
"INT. 18 V."
E. Set the
TEST
SELECTOR
to
#2
CHARGING
position.
F.
Adjust
ammeter
to read
ZERO
using the
elect-
rical
ZERO
ADJUST
control.
LOAD INCREASE
CONTROL
AMMETER
LOAD
LIGHT
ELECTRICAL
ZERO ADJUST
MECHANICAL
ZERO ADJUST
VOLTMETER
LEADS
SELECTOR
VOLT SELECTOR
MECHANICAL
ZERO ADJUST
FIELD
SELECTOR
Figure
1—Volt Ampere
Tester
Model
VAT-40.