d. Connect the test leads to the circuit under test, observing proper
polarity.
DC10A
Range
DESCRIPTIONANDSPECIFICATIONS
Resolution
Accuracy
Voltage Burden
CP7674 DIGITAL MULTITESTER
INSTRUCTIONMANUAL
DESCRIPTION: The Digital Multitester is a compact, hand-held, easy to use
precision instrument which is compatible both with home electrical applica-
tions, 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.
e. Read the results on the digital display. If the display reads overrange
(1.), switch to a higher range within the milliamps function.
10A
100mA
± (1.5% rdg + 3 dgts) 300mV rms Max.
Overload protection: unfused up to 10A for 15 seconds
3.DC 10 AMPS MEASUREMENT
a. Set the SELECTOR switch to the 10 Amps position.
Resistance
SAFETYGUIDELINES
SPECIFICATIONS:
b. Plug the BLACK test lead into the COMmon input jack on the
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 procedures.
Max. Open
Voltage
Display – 3 1/2 digit, .5 inch LCD (Liquid Crystal Display)
Range
200Ω
Resolution
0.1Ω
AccuracyCircuit
c. Plug the RED test lead into the 10 Amps input jack on the multitester.
Automatic Polarity Sensing – Display shows a minus (-) sign on the DC
Volts and Amps functions when lead hookup is reversed.
d.Connect the test leads to the circuit under test, observing proper
polarity.
2000Ω
20KΩ
1Ω
Zero adjustment
functions.
–
Unit automatically zeroes on the Volts and Amps
SAFETYEQUIPMENT
NOTE: Some vehicles have an automatic release on
the parking brake when the gear shift lever is re-
moved from the PARK position. This feature must be
disabled when it is necessary (for testing) to have the
parking brake engaged when in the DRIVE position.
Refer to your vehicle service manual for more infor-
mation.
± (1.0% rdg + 4 dgts)
e. Read the result on the digital display.
10Ω
3.2V
Fire Extinguisher
Overrange indication – Left side of display shows either “1” or “-1” when
range in a function is exceeded.
Never work on your car without having a suitable fire
extinguisherhandy.A5-lborlargerCO ordrychemi-
cal unit specified for gasoline/chem2ical/electrical
firesisrecommended.
4.RESISTANCEMEASUREMENT
200KΩ
2000KΩ
100Ω
1KΩ
a. Set the SELECTOR switch to the required resistance
position.
Ω
(ohms)
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.
Fireproof Container
HOTSURFACES
Rags and flammable liquids should be stored only in
fireproof,closedmetalcontainers.Agasoline-soaked
rag should be allowed to dry thoroughly outdoors
beforebeingdiscarded.
b. Plug the BLACK test lead into the COMmon jack on the multitester.
Avoid contact with hot surfaces such as exhaust
manifoldsandpipes, mufflers(catalyticconverters),
radiator and hoses. Never remove the radiator cap
while the engine is hot, as escaping coolant under
pressure may seriously burn you.
Measurement rate
–
2.5 measurements per second, nominal
Diode Check
c. Plug the RED test lead into the Volts Ω (ohms) milliAmps input jack on
the multitester.
Power – Nine (9) volt alkaline or carbon zinc battery
Use this test to check for open or shorted diodes. A good diode will show
a low reading with the test leads connected in one polarity, and a high reading
with the test leads connected in the other polarity. The low reading will be
typically some three-digit number on the display (for example: .673). The
actual number is not critical. The high reading should be infinity (1.).
Battery life –Alkaline: 200 hours typical
Safety Goggles
d. Connect the test leads to the circuit under test.
Carbon zinc: 100 hours typical
We recommend wearingsafety goggles whenwork-
ingonyourcar,toprotectyoureyesfrombatteryacid,
gasoline, and dust and dirt flying off moving engine
parts.
SMOKINGANDOPENFLAMES
Never smoke while working on your car. Gasoline
vapor is highly flammable, and the gas formed in a
charging battery is explosive.
e. Read the result on the digital display. If the display reads overrange
(1.), switch to a higher range within the resistance function.
Accessories – Test leads (pair), instruction manual
NOTE: Never look directly into the carburetor throat
while the engine is cranking or running, as sudden
backfire can cause burns.
FUNCTIONSANDDISPLAY:
5.DIODECHECK
BATTERY
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.
Whenoperatinganytestinstrumentfromanauxiliary
battery, connectajumperwirebetweenthenegative
terminal of the auxiliary battery and ground on the
vehicleundertest.Whenworkinginagarageorother
enclosedarea, auxiliarybatteryshouldbelocatedat
least 18 inches above the floor to minimize the
possibility of igniting gasoline vapors
The analyzer provides the following functions and displays them as
indicated.
a. Set the SELECTOR switch to the diode
position.
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 linkages. Never
wear neckties or loose clothing when working on
yourcar.
PRECAUTIONSANDPREPARATIONFOR
MEASUREMENT:
b. Plug the BLACK test lead into the COMmon input jack on the
multitester.
OFF - To preserve battery life always return the rotary switch to OFF when
testing is complete.
1.Be sure that a fresh nine (9) volt battery is correctly installed in the
multitester.
c. Plug the RED test lead into the Volts Ω (ohms) milliAmps input jack on
the multitester.
Accuracies are ± (% reading + No. of digits) at 23°C ± 5°C (75°F ± 3°F), less
than 75% R.H.
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.
d. Connect the test leads to the diode under test. The diode must be
removed from the circuit to achieve proper results.
JEWELRY
Never wear wrist watches, rings or other jewelry
when working on your car. You’ll avoid the possibil-
ity of catching on moving parts or causing an electri-
cal short circuit which could shock or burn you.
ACVolts
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.
Accuracy
(45Hz-450Hz)
Overvoltage
Protection
3.The BLACK test lead is always inserted in the COMmon jack on the
multitester. The RED test lead must be inserted in either the Volts
Ω(ohms) milliAmps jack, or the 10 Amps jack depending on the test
being performed. Incorrect placement of the RED test lead may
damage the multitester, the circuit under test, or both!
Range
200V
Resolution
100mV
1V
HIGH VOLTAGE
VENTILATION
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.
The carbon monoxide in exhaust gas is highly toxic.
To avoid asphyxiation, always operate vehicle in a
well-ventilatedarea. Ifvehicleisinanenclosedarea,
exhaust should be routed directly to the outside via
leakproof exhaust hose.
DC 750V
AC 750V
± (1.2% rdg + 5 dgts)
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.
750V
4.The 10 Amp range on the multitester is not fused. Exercise
extreme caution!
Input Impedance: 450K
SETTINGTHEBRAKE
MakesurethatyourcarisinParkor Neutral, andthat
the parking brake is firmly set.
JACK
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.
5.Operate the multitester only in temperatures between 0°C and 50°C
(32°F - 122°F), and at 80% or less relative humidity.
FUSEREPLACEMENT:
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.
DCVolts
All milliamp ranges of this miltitester are fuse protected. Should you exceed
2 amperes of current flow in any of these ranges, the fuse may open. To
maintain safe operation of the multitester, replace it only with a 2 Amp, 250
Volt, 5mm x 20mm fast-acting glass fuse. Replace the fuse as follows:
VEHICLESERVICEINFORMATION
Overvoltage
AccuracyProtection
Range
Resolution
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.
200mV
100µV
DC 500V
AC 350V
7.Do not store the multitester in direct sunlight, or in areas of high
temperature or high humidity.
1.Turn the SELECTOR switch OFF.
2.Remove the bottom case half.
3.Remove the battery.
2000mV
20V
1mV
10mV
100mV
1V
± (0.75% rdg + 2 dgts)
ORIGINAL EQUIPMENT MANUFACTURERS' VEHICLE SERVICE MANUALS
DC 1100V
AC 800V
MEASUREMENT PROCEDURES:
Cadillac, Chevrolet,
Pontiac
Helm Incorporated
Post Office Box 07130
Detroit, MI 48207
Oldsmobile
American Motors,
Chrysler Corporation,
Nissan, North America
Dyment Distribution
Services
4.Using a small blade screwdriver or other suitable tool, gently pry the
open fuse out of its holder.
Lansing Lithographers
Post Office Box 23188
Lansing, MI 48909
200V
1.VOLTAGEMEASUREMENT
5.Install a new fuse.
1000V
a. Set the SELECTOR switch to the required AC or DC voltage position.
6.Re-install the battery, and bottom case half.
b. Plug the BLACK test lead into the COMmon input jack on the
multitester.
Toyota Motor
Corporation
Toyota Service
Publications
750 W. Victoria St.
Compton, CA 90220-5538
CA residents:
1-800-443-7656
Outside CA:
1-800-622-2033
20770 Westwood Drive
Strongsville, OH 44136
(216) 572-0725
Input Impedance: 10mΩ
Ford Publications Dept.
Helm Incorporated
Post Office Box 07150
Detroit, MI 48207
c. Plug the RED test lead into the Volts Ω (ohms) milliAmps input jack on
the multitester.
REPLACEMENTPARTS
The following replacement parts are available for your multitester. Consult
your retailer or the manufacturer for assistance.
Buick
Tuar Company
Post Office Box 354
Flint, MI 48501
d. Connect the test leads to the circuit under test, observing proper
polarity when measuring DC voltage.
DCCurrent
Honda Motor Co., Ltd.
Helm Incorporated
Post Office Box 07280
Detroit, MI 48207
Range
Resolution
Accuracy
Voltage Burden
e. Read the result on the digital display. If the display reads overrange
(1.), switch to a higher range within the appropriate AC or DC function.
200µA
0.1µA
1µA
PARTNUMBER
0002-2274
DESCRIPTION
Instruction Manual
(313) 883-1430
2000µA
20mA
250mV rms Max.
2.DC MILLIAMP MEASUREMENT
AFTERMARKET VEHICLE SERVICE MANUALS
± (1.2% rdg + 2 dgts)
0044-0108
2 Amp 250 Volt Fuse
Black Test Lead Assembly
Red Test Lead Assembly
a. Set the SELECTOR switch to the required DC milliamp position.
10µA
100µA
1mA
Motor’s Auto Repair
Manual
Hearst Company
250 W. 55th Street
New York, NY 10019
Chilton Book Company
Chilton Way
Radnor, PA 19089
Cordura Publications
Mitchell Manuals, Inc.
Post Office Box 26260
San Diego, CA. 92126
0038-1748
b. Plug the BLACK test lead into the COMmon input jack on the
multitester.
200mA
2000mA
0038-1749
± (1.5% rdg + 2 dgts) 700mV rms Max.
c. Plug the RED test lead into the Volts Ω (ohms) milliAmps input jack on
the multitester.
Overload protection: mA Input: 2A/250V fuse
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