250V MAX
15A MAX
FUSED
COM
DC
15A
200
K
20K
2K
200
8CYL
6CYL
TACH
X10
5CYL
4CYL
OHMS
15
A
250V MAX
15A MAX
FUSED
COM
DC
15A
AUTO POWER OFF
CP7678
®
OFF
200
20
2
DC V
200
m
20M
200
K
20K
2K
200
8CYL
6CYL
TACH
X10
5CYL
4CYL
8CYL
6CYL
5CYL
4CYL
DWELL
DUTY
CYCLE
%
OHMS
°
20V
15
A
8
Measuring DC Voltage
This multimeter can be used to measure DC
voltages in the range from 0 to 200V. You can
use this multimeter to do any DC voltage
measurement called out in the vehicle service
manual. The most common applications are
measuring voltage drops, and checking if the
correct voltage arrived at a sensor or a par-
ticular circuit.
crease to the appropriate range as re-
quired. (See Setting the Range on page 6)
6. View reading on display - Note range
setting for correct units.
NOTE: 200mV = 0.2V
Measuring Resistance
Resistance is measured in electrical units
called ohms (
Ω
). The digital multimeter can
measure resistance from 0.1
Ω
to 20M
Ω
or
(20,000,000 ohms). Infinite resistance is
shown with a “1” on the left side of display
(See Setting the Range on page 6). You can
use this multimeter to do any resistance mea-
surement called out in the vehicle service
manual. Testing ignition coils, spark plug wires,
and some engine sensors are common uses
for the OHMS (
Ω
) function.
Fig. 7
To measure DC Voltages (see Fig. 7):
1. Insert BLACK test lead into COM test
lead jack.
2. Insert RED test lead into
test
lead jack.
3. Connect RED test lead to positive (+)
side of voltage source.
4. Connect BLACK test lead to negative (-)
side of voltage source.
NOTE: If you don’t know which side is
positive (+) and which side is negative (-),
then arbitrarily connect the RED test lead
to one side and the BLACK to the other.
The multimeter automatically senses po-
larity and will display a minus (-) sign when
negative polarity is measured. If you switch
the RED and BLACK test leads, positive
polarity will now be indicated on the dis-
play. Measuring negative voltages causes
no harm to the multimeter.
5. Turn multimeter rotary switch to de-
sired voltage range.
If the approximate voltage is unknown,
start at the largest voltage range and de-
Fig. 8
To measure Resistance (see Fig. 8):
1. Turn circuit power OFF.
To get an accurate resistance measure-
ment and avoid possible damage to the
digital multimeter and electrical circuit un-
der test, turn off all electrical power in the
circuit where the resistance measurement
is being taken.
2. Insert BLACK test lead into COM test
lead jack.
3. Insert RED test lead into
test
lead jack.
4. Turn multimeter rotary switch to 200
Ω
range.
Touch RED and BLACK multimeter leads
together and view reading on display.
Red
Black
Red
Black
Unknown
Resistance