ing the VAT
60,
a
load
generated
by the LOAD
CONTROL KNOB
can still
be
applied
to
a 6
or
12-volt battery.
CAUTION:
LOAD
CONTROL must show
OFF
when connecting
leads.
MANUAL
—
The
MANUAL
mode allows the
opera-
tor to make voltage
(external and internal),
amps,
and
rpm
readings
without
a GOOD/BAD
determina-
tion. The15SECTIMER
can
be
utilized
inthe MAN-
UAL
mode.
BATTERY
LOAD
—
The BATTERY
LOAD test
allows the
operator to conduct
an automated test
sequence determining
the GOOD/BAD
state of a
vehicle battery.
The BATTERY
LOAD
test is admin-
istered after a
pre-test battery
condition evaluation.
STARTING- This
mode allows for
voltage and cur-
rent readings to
be
displayed
while the
engine
is
cranking.
CHARGING/DIODE
STATOR
-
This mode enables
a
test on the
diode/stator and charging
system.
Volts, amps, and
rpm values are displayed as is
the
GOOD/BAD status
of the diode/stator.
NOTE:
It is not necessary
to perform
tests
in
the specific FUNCTION
SELECTOR order. The
VAT 60 is
designed so that any system
test can
be
performed in any desired
testing order.
Each mode is
discussed in greater detail in
the
TESTING
MODES section
of this manual.
ZERO/RESET
SWITCH
This
spring-loaded rocker
switch
(Figure
1
)
is used
to automatically
clear displays and set BLACK
AMP
PROBE at 0.
When adjusting
zero, the FUNCTION SELECTOR
must be in the MANUAL
mode with the load leads
connected to the battery. Additionally,
the jaw of the
AMP PROBE
must be closed and no current
flow
must
be
present.
FIELD
SELECTOR
This three-position
rocker switch (Figure
1)
is used
in conjunction
with the BLUE FIELD LEAD. It
has
a
spring-loaded "off” position.
Its
left
and right posi-
tions
are
identified “A”
and “B” respectively.
In
the “A” position
—
The BLUE LEAD
is internally
connected to the
negative battery
cable
fortesting A
circuits.
In
the “B” position
—
The
BLUE LEAD
is internally
connected
to the
positive battery
cable
for testing
B
circuits.
IGNITION
SELECTOR
The two-position
IGNITION
SELECTOR
switch
(Figure
1)
enables RPM
measurements
for
4-cycle
(position
1)
and
2-cycle
(position
2)
engines.
Posi-
tion
two also
accommodates
tests for other
ignition
systems (ie.,
C
3
I
(wasted spark) and rotary
engines).
INT/EXT
VOLT
SELECTOR
The VOLT
SELECTOR
(Figure
1)
is set in the INT
position
for most
tests. In this position,
the volts
display is internally
connected to the
load cables
and
then to the
battery through
special wires within
the load
leads.
This eliminates
two test connections.
When
the VOLT
SELECTOR
is set to the EXT posi-
tion,
the volts
display
is connected
to the
external
red
and black volt
leads. The
external red and black
volt leads
are connected
to
the
VAT
60 through an
input
located
beneath
the unit’s front panel (Figure
1).
Inputs
and
leads are further
discussed on the
following
pages.
NOTE:
The
input impedance
of the leads is 10
megohms.
NOTE: To
use the
EXTERNAL VOLT LEADS
the BATTERY
LOAD
LEADS must
be connected
to
a battery.
INPUTS
AND
LEADS
The
leads
themselves
and their respective
inputs
on
the VAT
60 are
best illustrated
in Figure 1
and
are
discussed
below.
BATTERY
LOAD
LEADS
The red
and
black INTERNAL
BATTERY LOAD
LEADS (Figure
1)
serve
three purposes:
1.
To provide the
power to
operate the tester.
2. To load
test a six-
or twelve-volt
battery.
3. To provide
voltage
readings
when the INT/EXT
VOLT
SELECTOR is
in the INT
position.
The BATTERY
LOAD
LEADS
are color-coded, red
for positive
and black
for
negative.
EXTERNAL VOLT
LEADS
This pair of
red
and black volt
leads (Figure
1)
is
used whenever
voltage
measurements
other than
battery
terminal
voltage are to
be made. These
leads
are internally
disconnected
from
the
volts display
2
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