e. Read the result on the digital display. If the display reads over-range (1), switch to a
higher range within the resistance function.
Resistance
DESCRIPTION AND SPECIFICATIONS:
CP7672 GENERAL PURPOSE DIGITAL MULTITESTER
INSTRUCTION MANUAL
Max. Open
Circuit Voltage
DESCRIPTION: This Digital Multitester is a compact, hand-held, easy to use instrument
compatible both with home electrical applications, as well as the electrical systems used in
modern passenger cars and trucks. It may also be used to measure voltages in the computer
control circuits of computer-controlled vehicles.
Range
200Ω
Resolution
0.1Ω
Accuracy
5. DIODE CHECK
a. Set the SELECTOR switch to the
(diode) position.
b. Plug the BLACK test lead into the COM input jack on the
SAFETY GUIDELINES
2000Ω
20KΩ
1Ω
multitester.
Your Digital Multitester is designed for both home and automotive use. The
following Safety Guidelines are provided when it is used for engine or vehicle
testing. To prevent accidents that could result in serious injury and/or damage to
your vehicle or test equipment, carefully follow these safety rules and test proce-
SPECIFICATIONS:
10Ω
± (0.8% rdg + 2 dgts)
± (1% rdg + 2 dgts)
2.8V
c. Plug the RED test lead into the V mA input jack on the multitester.
Display – 3 1/2 digit, .5 inch LCD (Liquid Crystal Display)
d. Connect the test leads to the diode under test. The diode must be removed from the
circuit to achieve proper results.
200KΩ
2000KΩ
100Ω
1KΩ
Automatic Polarity Sensing – Display shows a minus (-) sign on the DC Volts and Amps
functions when lead hookup is reversed.
dures
.
e. Read the result on the digital display.
f. Reverse the test lead connections at the diode.
g. Read the result on the digital display.
Zero adjustment – Unit automatically zeroes on the volts and Amps functions.
SAFETY EQUIPMENT
to have the parking brake engaged when in the
DRIVE position. Refer to your vehicle service
manual for more information.
Over range indication – Left side of display shows either “1” or “-1” when range in a function
is exceeded.
Diode Check
Use this test to check for open or shorted diodes.
Fire Extinguisher
Never work on your car without having a suitable
fire extinguisher handy. A 5-lb or larger CO2 or dry
chemical unit specified for gasoline/chemical/elec-
trical fires is recommended.
Operating temperature – 0°C - 35°C (32°F - 95°F), 0-80% R.H.; 35°C - 50°C (95°F
- 122°F), 0-70% R.H.
HOT SURFACES
h. A good diode will show a low reading with the test leads connected one way, and
infinity (1) with the test leads connected the other way. The low reading will typically
be some three-digit number on the display. The actual number is not critical.
Transistor Check (hFE)
Use this test to check for open or shorted transistors.
Avoid contact with hot surfaces such as exhaust
manifolds and pipes, mufflers (catalytic convert-
ers), radiator and hoses. Never remove the radia-
tor cap while the engine is hot, as escaping coolant
under pressure may seriously burn you.
Measurement rate – 2.5 measurements per second, nominal
Power – Nine (9) volt alkaline or carbon zinc battery, NEDA 1604
Accessories – Test leads (pair), instruction manual
Fireproof Container
6. TRANSISTOR CHECK
Rags and flammable liquids should be stored only
in fireproof, closed metal containers. A gasoline-
soaked rag should be allowed to dry thoroughly
outdoors before being discarded.
PRECAUTIONS AND PREPARATION FOR MEASUREMENT:
a. Set the SELECTOR switch to the hFE position.
SMOKING AND OPEN FLAMES
Never smoke while working on your car. Gasoline
vapor is highly flammable, and the gas formed in a
charging battery is explosive.
b. Determine whether the transistor is NPN or PNP type and locate the Emitter, Base,
and Collector leads. Insert the leads into the proper holes of the hFE socket located
on the front of the multitester.
1. Be sure that a fresh nine (9) volt battery is correctly installed in the multitester.
Safety Goggles
FUNCTIONS AND DISPLAY:
2. Compare the position of the selector switch with the anticipated test result. In the case
of voltage or current measurement, always select a range which is high enough to
handle the worst case result! Voltage or current may be higher than you expect.
Werecommendwearingsafetygoggleswhenwork-
ing on your car, to protect your eyes from battery
acid, gasoline, and dust and dirt flying off moving
engine parts.
The analyzer provides the following functions and displays them as indicated.
BATTERY
c. The display will show an appropriate value of the transistor hFE measured under
the following condition: base current = 10mA, collector-emitter voltage = 2.8V.
Do not lay tools or equipment on the battery.
Accidentally grounding the “HOT” battery terminal
can shock or burn you and damage wiring, the
battery or your tools and testers. Be careful of
contact with battery acid. It can burn holes in your
clothing and burn your skin or eyes.
OFF - To preserve battery life always return the rotary switch to OFF when
testing is complete.
3. The BLACK test lead is always inserted in the COM (common) jack on the multitester.
The RED test lead must be inserted in either the V mA (Volt-ohm-milliAmp) jack or
the 10ADC (Amperes DC) jack, depending on the test being performed. Incorrect
placement of the RED test lead may damage the multitester, the circuit under
test, or both!
Accuracies are ± (% reading + No. of digits) at 23°C ± 5°C (75°F ± 9°F), less
than 75% R.H.
FUSE REPLACEMENT:
NOTE: Never look directly into the carburetor
throat while the engine is cranking or running, as
sudden backfire can cause burns.
All milliampere (mA) ranges of this multitester are fuse protected. Should the current exceed
200 mA in any of these ranges, the fuse may open. To maintain safe operation of the
multitester, replace it only with a 200 mA, 250 V, 5mm x 20mm fast-acting glass fuse. Replace
the fuse as follows:
When operating any test instrument from an auxil-
iary battery, connect a jumper wire between the
negativeterminaloftheauxiliarybatteryandground
on the vehicle under test. When working in a
garage or other enclosed area, auxiliary battery
should be located at least 18 inches above the floor
to minimize the possibility of igniting gasoline va-
pors
LOOSE CLOTHING AND LONG HAIR
(MOVING PARTS)
Be very careful not to get your hands, hair or
clothes near any moving parts such as fan blades,
belts and pulleys or throttle and transmission link-
ages. Never wear neckties or loose clothing when
working on your car.
4. The 10 Amp range on the multitester is not fused. Exercise extreme caution!
1. Turn the SELECTOR switch OFF.
2. Remove the bottom case half.
3. Remove the battery.
5. Operate the multitester only in temperatures between 0°C and 50°C (32°F - 122°F),
and at 80% or less relative humidity (RH).
AC Volts
Accuracy
(45Hz-450Hz)Protection
Overvoltage
6. Turn the SELECTOR switch to the OFF position when testing is completed. If the
multitester will not be used for an extended period of time, remove the internal nine (9)
volt battery to avoid damage from leakage.
JEWELRY
HIGH VOLTAGE
Range
200V
Resolution
100mV
1V
High voltage – 30,000 to 50,000 volts – is present
in the ignition coil, distributor cap, ignition wires
and spark plugs. When handling ignition wires
while the engine is running, use insulated pliers to
avoid a shock. While not lethal, a shock may cause
you to jerk involuntarily and hurt yourself.
Never wear wrist watches, rings or other jewelry
when working on your car. You’ll avoid the possi-
bility of catching them on moving parts or causing
an electrical short circuit which could shock or burn
you.
4. Using a small blade screwdriver or other suitable tool, gently pry the open fuse out of
its holder.
DC 1000V
± (1.2% rdg + 10 dgts)
7. Do not store the multitester in direct sunlight, or in areas of high temperature or high
humidity.
5. Install a new fuse.
750V
AC 750V
6. Reinstall the battery, and bottom case half.
VENTILATION
JACK
The carbon monoxide in exhaust gas is highly
toxic. To avoid asphyxiation, always operate ve-
hicle in a well-ventilated area. If vehicle is in an
enclosed area, exhaust should be routed directly to
the outside via leakproof exhaust hose.
MEASUREMENT PROCEDURES:
The jack supplied with the vehicle should be used
only for changing wheels. Never crawl under car or
run engine while vehicle is on a jack.
REPLACEMENT PARTS:
The following replacement parts are available for your multitester. Consult your retailer or the
manufacturer for assistance.
DC Volts
1. VOLTAGE MEASUREMENT
Overvoltage
Protection
a. Set the SELECTOR switch to the ACV or DCV voltage position.
b. Plug the BLACK test lead into the COM input jack on the multitester.
c. Plug the RED test lead into the V mA input jack on the multitester.
Range
Resolution
Accuracy
SETTING THE BRAKE
Make sure that your car is in Park or Neutral,
and that the parking brake is firmly set.
PART NUMBER
0002-001-2387
0044-000-0121
0038-000-3256
DESCRIPTION
Instruction Manual
200mV
100µV
DC 500V
AC 220V
± (0.25% rdg + 2 dgts)
NOTE: Some vehicles have an automatic release
on the parking brake when the gear shift lever is
removed from the PARK position. This feature
must be disabled when it is necessary (for testing)
d. Connect the test leads to the circuit under test, observing proper polarity when
measuring DC voltage.
200 mA 250V Fuse
Red/Black Test Lead Set
2000mV
20V
1mV
10mV
100mV
1V
± (0.5% rdg + 2 dgts)
e. Read the result on the digital display. If the display reads over-range (1), switch to a
DC 1000V
AC 750V
higher range within the ACV or DCV function.
200V
2. DC MILLIAMP MEASUREMENT
VEHICLE SERVICE INFORMATION
The following is a list of publishers who have service manuals for your specific vehicle. Write or call them
for availability and prices, specifying the make, style, model year and VIN (Vehicle Identification Number)
of your vehicle.
a. Set the SELECTOR switch to the DCA current position.
b. Plug the BLACK test lead into the COM input jack on the multitester.
c. Plug the RED test lead into the V mA input jack on the multitester.
d. Connect the test leads to the circuit under test, observing proper polarity.
1000V
DC Current
ORIGINAL EQUIPMENT MANUFACTURERS' VEHICLE SERVICE MANUALS
Voltage
Burden
e. Read the results on the digital display. If the display reads over-range (1), switch to
Range
Resolution
Accuracy
American Motors,
Chrysler Corporation,
Nissan, North America
Dyment Distribution
Services
20770 Westwood Drive
Strongsville, OH 44136
(440) 572-0725
Cadillac, Chevrolet,
Pontiac
Helm Incorporated
Post Office Box 07130
Detroit, MI 48207
Oldsmobile
a higher range within the DCA function.
Lansing Lithographers
Post Office Box 23188
Lansing, MI 48909
200µA
0.1µA
3. DC 10 AMPS MEASUREMENT
2000µA
20mA
1µA
10µA
100µA
± (1% rdg + 2 dgts)
200mV
Toyota Motor
Corporation
a. Set the SELECTOR switch to the 10 A current position.
b. Plug the BLACK test lead into the COM input jack on the multitester.
c. Plug the RED test lead into the 10ADC input jack on the multitester.
d. Connect the test leads to the circuit under test, observing proper polarity.
e. Read the result on the digital display.
Ford Publications Dept.
Helm Incorporated
Post Office Box 07150
Detroit, MI 48207
Toyota Service Publications
750 W. Victoria St.
Compton, CA 90220-5538
CA residents:
200mA
± (1.2% rdg + 2 dgts)
Buick
Tuar Company
Post Office Box 354
Flint, MI 48501
Honda Motor Co., Ltd.
Helm Incorporated
Post Office Box 07280
Detroit, MI 48207
1-800-443-7656
Overload protection: mA Input: 200mA/250V fuse
Outside CA:
1-800-622-2033
4. RESISTANCE MEASUREMENT
(313) 883-1430
DC 10A
a. Set the SELECTOR switch to the required resistance (ohms) position.
b. Plug the BLACK test lead into the COM input jack on the multitester.
c. Plug the RED test lead into the V mA input jack on the multitester.
d. Connect the test leads to the circuit under test.
Range
Resolution
Accuracy
Voltage Burden
AFTERMARKET VEHICLE SERVICE MANUALS
Chilton Book Company Cordura Publications
Motor’s Auto Repair
Manual
10A
10mA
± (2% rdg + 2 dgts)
200mV
ChiltonWay
Radnor, PA19089
MitchellManuals, Inc.
Post Office Box 26260
San Diego, CA. 92126
Hearst Company
250 W. 55th Street
New York, NY 10019
Overload protection: un-fused up to 10A for 15 seconds
0002-001-2387
15825 Industrial Parkway Cleveland, Ohio 44135
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