Actron CP7674 User Manual
CP7674 DIGITAL MULTITESTER
INSTRUCTION MANUAL
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.
SAFETY EQUIPMENT
Fire Extinguisher
Never work on your car without having a suitable fire
extinguisher handy. A 5-lb or larger CO
cal unit specified for gasoline/chemical/electrical
fires is recommended.
Fireproof Container
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.
Safety Goggles
We recommend wearing safety goggles when working on your car, to protect your eyes from battery acid,
gasoline, and dust and dirt flying off moving engine
parts.
NOTE: Never look directly into the carburetor throat
while the engine is cranking or running, as sudden
backfire can cause burns.
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
your car.
JEWELRY
Never wear wrist watches, rings or other jewelry
when working on your car. Youll avoid the possibility of catching on moving parts or causing an electrical short circuit which could shock or burn you.
VENTILATION
The carbon monoxide in exhaust gas is highly toxic.
To avoid asphyxiation, always operate vehicle in a
well-ventilated area. If vehicle is in an enclosed area,
exhaust should be routed directly to the outside via
leakproof exhaust hose.
SETTING THE BRAKE
Make sure that your car is in Park o r Neutral, and that
the parking brake is firmly set.
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.
ORIGINAL EQUIPMENT MANUFACTURERS' VEHICLE SERVICE MANUALS
American Motors,
Chrysler Corporation,
Nissan, North America
Dyment Distribution
Services
20770 Westwood Drive
Strongsville, OH 44136
(216) 572-0725
Buick
Tuar Company
Post Office Box 354
Flint, MI 48501
AFTERMARKET VEHICLE SERVICE MANUALS
Chilton Book Company
Chilton Way
Radnor, PA 19089
SAFETY GUIDELINES
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
or dry chemi-
2
Cadillac, Chevrolet,
Pontiac
Helm Incorporated
Post Office Box 07130
Detroit, MI 48207
Ford Publications Dept.
Helm Incorporated
Post Office Box 07150
Detroit, MI 48207
Honda Motor Co., Ltd.
Helm Incorporated
Post Office Box 07280
Detroit, MI 48207
(313) 883-1430
Cordura Publications
Mitchell Manuals, Inc.
Post Office Box 26260
San Diego, CA. 92126
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 information.
HOT SURFACES
Avoid contact with hot surfaces such as exhaust
manifolds and pipes, mufflers (catalytic converters),
radiator and hoses. Never remove the radiator cap
while the engine is hot, as escaping coolant under
pressure may seriously burn you.
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.
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.
When operating any test instrument from an auxiliary
battery, connect a jumper wire between the negative
terminal of the auxiliary battery and ground 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 vapors
HIGH VOLTAGE
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.
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.
Oldsmobile
Lansing Lithographers
Post Office Box 23188
Lansing, MI 48909
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
Motors Auto Repair
Manual
Hearst Company
250 W. 55th Street
New York, NY 10019
DESCRIPTION AND SPECIFICATIONS
DESCRIPTION: The Digital Multitester is a compact, hand-held, easy to use
precision instrument which is 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.
SPECIFICATIONS:
Display 3 1/2 digit, .5 inch LCD (Liquid Crystal Display)
Automatic Polarity Sensing Display shows a minus (-) sign on the DC
Volts and Amps functions when lead hookup is reversed.
Zero adjustment Unit automatically zeroes on the Volts and Amps
functions.
Overrange indication Left side of display shows either 1 or -1 when
range in a function is exceeded.
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.
Measurement rate 2.5 measurements per second, nominal
Power Nine (9) volt alkaline or carbon zinc battery
Battery life Alkaline: 200 hours typical
Carbon zinc: 100 hours typical
Accessories Test leads (pair), instruction manual
FUNCTIONS AND DISPLAY:
The analyzer provides the following functions and displays them as
indicated.
OFF - To preserve battery life always return the rotary switch to OFF when
testing is complete.
Accuracies are ± (% reading + No. of digits) at 23°C ± 5°C (75°F ± 3°F), less
than 75% R.H.
AC Volts
Range Resolution (45Hz-450Hz) Protection
200V 100mV DC 750V
750V 1V AC 750V
Input Impedance: 450K
Accuracy Overvoltage
± (1.2% rdg + 5 dgts)
DC Volts
Range Resolution Accuracy Protection
200mV 100µV DC 500V
2000mV 1mV
± (0.75% rdg + 2 dgts)
20V 10mV DC 1100V
200V 100mV AC 800V
1000V 1V
Input Impedance: 10mΩ
Overvoltage
AC 350V
DC Current
Range Resolution Accuracy Voltage Burden
200µA 0.1µA
2000µA 1µA 250mV rms Max.
20mA 10µA
200mA 100µA
2000mA 1mA ± (1.5% rdg + 2 dgts) 700mV rms Max.
Overload protection: mA Input: 2A/250V fuse
± (1.2% rdg + 2 dgts)
DC 10A
Range Resolution Accuracy Voltage Burden
10A 100mA ± (1.5% rdg + 3 dgts) 300mV rms Max.
Overload protection: unfused up to 10A for 15 seconds
Resistance
Range Resolution Accuracy Circuit Voltage
200Ω 0.1Ω
2000Ω 1Ω
± (1.0% rdg + 4 dgts)
20KΩ 10Ω
200KΩ 100Ω
2000KΩ 1KΩ
Max. Open
3.2V
Diode Check
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.).
PRECAUTIONS AND PREPARATION FOR
MEASUREMENT:
1.Be sure that a fresh nine (9) volt battery is correctly installed in the
multitester.
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.
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!
4.The 10 Amp range on the multitester is not fused. Exercise
extreme caution!
5.Operate the multitester only in temperatures between 0°C and 50°C
(32°F - 122°F), and at 80% or less relative humidity.
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.
7.Do not store the multitester in direct sunlight, or in areas of high
temperature or high humidity.
MEASUREMENT PROCEDURES:
1.VOLTAGE MEASUREMENT
a. Set the SELECTOR switch to the required AC or DC voltage position.
b. Plug the BLACK test lead into the COMmon input jack on the
multitester.
c. Plug the RED test lead into the Volts Ω (ohms) milliAmps input jack on
the multitester.
d. Connect the test leads to the circuit under test, observing proper
polarity when measuring DC voltage.
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.
2.DC MILLIAMP MEASUREMENT
a. Set the SELECTOR switch to the required DC milliamp position.
b.
Plug the BLACK test lead into the COMmon input jack on the
multitester.
c. Plug the RED test lead into the Volts Ω (ohms) milliAmps input jack on
the multitester.
d.
Connect the test leads to the circuit under test, observing proper
polarity.
e.
Read the results on the digital display. If the display reads overrange
(1.),
switch to a higher range within the milliamps function.
3.DC 10 AMPS MEASUREMENT
a. Set the SELECTOR switch to the 10 Amps position.
Plug the BLACK test lead into the COMmon input jack on the
b.
multitester.
c. Plug the RED test lead into the 10 Amps 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.
4.RESISTANCE MEASUREMENT
a.
Set the SELECTOR switch to the required resistance Ω (ohms)
position.
b. Plug the BLACK test lead into the COMmon jack on the multitester.
c. Plug the RED test lead into the Volts Ω (ohms) milliAmps input jack on
the multitester.
d. Connect the test leads to the circuit under test.
e. Read the result on the digital display. If the display reads overrange
(1.), switch to a higher range within the resistance function.
5.DIODE CHECK
a. Set the SELECTOR switch to the diode position.
b. Plug the BLACK test lead into the COMmon input jack on the
multitester.
c. Plug the RED test lead into the Volts Ω (ohms) milliAmps input jack on
the multitester.
d. Connect the test leads to the diode under test. The diode must be
removed from the circuit to achieve proper results.
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.
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.
FUSE REPLACEMENT:
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:
1.Turn the SELECTOR switch OFF.
2.Remove the bottom case half.
3.Remove the battery.
4.Using a small blade screwdriver or other suitable tool, gently pry the
open fuse out of its holder.
5.Install a new fuse.
6.Re-install the battery, and bottom case half.
REPLACEMENT PARTS
The following replacement parts are available for your multitester. Consult
your retailer or the manufacturer for assistance.
PART NUMBER DESCRIPTION
0002-2274 Instruction Manual
0044-0108 2 Amp 250 Volt Fuse
0038-1748 Black Test Lead Assembly
0038-1749 Red Test Lead Assembly
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