Centech CM300 Manual de usuario

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Owner’s Manual & Safety Instructions

Save This Manual Keep this manual for the safety warnings and precautions, assembly,

operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the

back of the manual near the assembly diagram (or month and year of purchase if product has no number).

Keep this manual and the receipt in a safe and dry place for future reference. 22h

When unpacking, make sure that the product is intact

and undamaged. If any parts are missing or broken,

please call 1-888-866-5797 as soon as possible.

No portion of this manual or any artwork contained herein may be reproduced in

any shape or form without the express written consent of Harbor Freight Tools.

Diagrams within this manual may not be drawn proportionally. Due to continuing

improvements, actual product may differ slightly from the product

described herein. Tools required for assembly and service may not be included.

Read this material before using this

product. Failure to do so can result in

serious injury. SAVE THIS MANUAL.

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SAFETY OPERATION MAINTENANCESETUP

WARNING SYMBOLS AND DEFINITIONS

This is the safety alert symbol. It is used to alert you to

potential personal injury hazards. Obey all safety messages

that follow this symbol to avoid possible injury or death.

Indicates a hazardous situation which, if not avoided,

will result in death or serious injury.

Indicates a hazardous situation which, if not avoided,

could result in death or serious injury.

Indicates a hazardous situation which, if not avoided,

could result in minor or moderate injury.

Addresses practices not related to personal injury.

Table of Contents

Safety ..........................................3

Specifications ..............................5

Setup ...........................................6

Operation.....................................8

Maintenance............................... 14

Warranty .....................................16

Page 3For technical questions, please call 1-888-866-5797.Item 59410

SAFETYOPERATIONMAINTENANCE SETUP

IMPORTANT SAFETY INFORMATION

Safety Warnings and Precautions

Read all safety warnings and all instructions.

Failure to follow the warnings and instructions may result

in electric shock, fire and/or serious injury.

Save all warnings and instructions for future reference.

1. Electrical shock can cause death

or injury! NEVER TOUCH exposed

conductors of electricity.

2. Test cable voltages with care.

One use one hand when touching

probes to measurement points.

3. Inspect the Meter before use. In

addition to a general inspection,

look specifically for:

a. Pay special attention to the

insulation protecting the connectors.

b. Check the leads for exposed metal,

damaged insulation, and continuity.

c. Replace damaged test lead

immediately, before use.

4. Do not use the Meter if:

a. The test lead is damaged

in any way.

b. The battery is low.

c. Near any explosive

gasses or fumes.

d. Any abnormal operation is detected.

(If in doubt about the condition

of the Meter, have it serviced.)

e. Any abnormal operation is detected.

(If in doubt about the

condition of the Meter, have

it serviced before use.)

f. The battery cover is open.

5. This Meter should be powered only by

2, correctly installed AAA batteries.

6. Use caution when working near

voltages above 30 VAC rms, 42 VAC

peak, or 60 VDC. Voltages this high

present a risk of electric shock.

7. Disconnect the circuit’s power

before connecting the Meter in

series, when measuring current.

8. Connect the common (COM) test

lead first and disconnect it last.

9. Hold the probes with fingers

behind guards.

10. Avoid electrical shock. Use extreme

caution when working near uninsulated

conductors or bus bars. Prevent body

contact with grounded surfaces such

as pipes, radiators, ranges, and cabinet

enclosures when testing voltages.

11. Observe work area conditions. Do

not test voltages in damp or wet

locations. Don’t expose to rain.

Keep work area clean and well lit.

12. Keep children away. Children must

never be allowed in the work area.

13. Stay alert. Watch what you are doing,

use common sense. Do not operate

any Meter when you are tired.

14. Do not operate Meter if under the

influence of alcohol or drugs. Read

warning labels on prescriptions to

determine if your judgment or reflexes

are impaired while taking drugs. If there

is any doubt, do not operate the Meter.

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SAFETY OPERATION MAINTENANCESETUP

15. People with pacemakers should

consult their physician(s) before

use. Electromagnetic fields in close

proximity to heart pacemaker could

cause pacemaker interference

or pacemaker failure.

16. Do not test voltage on circuits

higher than 600 volts. This type

of testing should only be done

by a qualified electrician.

17. Store idle equipment. When not

in use, Meter must be stored in a

dry location to decrease exposure

to moisture. Lock up Meter and

keep out of reach of children.

18. Dress properly. Protective,

electrically nonconductive

clothes and nonskid footwear are

recommended when working.

19. Wear ANSI-approved safety

goggles during use.

20. Only use accessories intended

for use with this Meter.

21. The warnings, cautions, and

instructions discussed in this instruction

manual cannot cover all possible

conditions and situations that may

occur. It must be understood by the

operator that common sense and

caution are factors which cannot

be built into this product, but must

be supplied by the operator.

22. Avoid damaging Meter. Use only

as specified in this manual.

23. Performance of this Meter may vary

depending on battery condition.

24. Use the proper settings, terminals,

techniques, and range for the

tests performed. Start with the

range stated in the instructions.

25. Do not apply voltage to the Test

Leads when the Meter is in the

Ohms testing setting. Damage

can occur to the Meter.

26. Do not switch between testing modes

with the Meter connected to a circuit.

27. Prior to testing capacitors, resistance,

diodes, or continuity; disconnect all

power to the circuit and discharge

all high-voltage capacitors.

28. Have the Meter calibrated by a

qualified technician every year.

A Meter that is not calibrated yearly

may not yield accurate results.

SAVE THESE INSTRUCTIONS.

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SAFETYOPERATIONMAINTENANCE SETUP

Specifications

Function Range Resolution Accuracy

AC Voltage 600V 0.1V ±(1.2% + 3 digits)

DC Voltage 600mV 0.1mV ±(0.7% + 3 digits)

6000mV 1mV ±(0.5% + 2 digits)

60V 0.01V ±(0.7% + 3 digits)

600V 0.1V ±(0.7% + 3 digits)

DC Current 600uA, 60mA, 600mA 0.1µA, 0.01mA,

0.1mA

±(1.0% + 3 digits)

10A 0.01A ±(1.2% + 5 digits)

Resistance 600Ω 0.1Ω ±(1.0% + 2 digits)

6000Ω, 60KΩ, 600KΩ 1Ω, 0.01kΩ, 0.1kΩ ±(0.8% + 2 digits)

60MΩ 0.01mΩ ±(2.0% + 5 digits)

Capacitance 9.999nF 0.001nF ±(4.0% + 10 digits)

99.99nF, 999.9nF 0.01nF, 0.1nF ±(4.0% + 5 digits)

9.999µF, 99.99µF, 999.9µF 0.001µF,

0.01µF, 0.1µF

±(4.0% + 5 digits)

9.999mF 0.001mF ± 10%

Sampling

Rate

~3 times/second

Storage

Temperature

Range: 14°F to 122°F

Operating

Temperature

Range: 32° - 104°F

Relative

Humidity

< 75% at 32°-86°F

< 50% at 86°-104°F

Operating

Altitude

7000ft. (2000meters)

maximum

Fuse Type 10A Jack: F 10A H 600V

Fuse Ø6x25mm

Battery 2x AAA batteries (included)

Page 6 For technical questions, please call 1-888-866-5797. Item 59410

SAFETY OPERATION MAINTENANCESETUP

Setup - Before Use:

Read the ENTIRE IMPORTANT SAFETY INFORMATION section

at the beginning of this manual including all text under

subheadings therein before set up or use of this product.

Functions

LCD Display

Back Light

Button

Relative Button

VΩmA Input

Terminal

COM Input

Terminal

10A Input

Terminal

Rotary Dial

Hold/Select

Button

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SAFETYOPERATIONMAINTENANCE SETUP

Display

Symbol Description

APO Auto Power Off

Dangerous Voltage Levels

Data Hold Mode

DC Direct Current

Minus Sign

AC Alternating Current

NCV Non Contact Voltage

Diode Test

Audible Continuity

Good Low Bad Battery Measurement

Low Battery

6000 Count LCD Display 0 to 5999 measurement Reading

mV, V Volts (Voltage)

µA, mA, A Amps (Current)

nF, uF, mF, F Farads (Capacitance)

Ω, kΩ, MΩ Ohms (Resistance)

Record Serial Number Here:

Note: If product has no serial number, record month and year of purchase instead.

Refer to UPC 193175469489

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SAFETY OPERATION MAINTENANCESETUP

Operating Instructions

Read the ENTIRE IMPORTANT SAFETY INFORMATION section

at the beginning of this manual including all text under

subheadings therein before set up or use of this product.

Electrical shock can cause death or injury! NEVER TOUCH

exposed conductors of electricity.

General Operating Instructions

Data Hold/Select

• To freeze the LCD meter reading,

press the HOLD/SELECT button.

• While data hold is active, the HOLD

display icon appears on the LCD.

• Press the HOLD/SELECT Button

again to return to normal operation.

Relative Button

In Capacitance Mode, press the REL

Button to zero out the Multimeter prior

to touching Probes to Capacitor.

Backlight Button

Press the BACKLIGHT button to

turn on the Backlight, press the

button again to turn Backlight off.

Note: Frequent use of the backlight will

shorten the life of the batteries. Only

use the backlight when necessary.

Auto Power Off

If Meter is not used for approximately 15 minutes, it will automatically turn itself

off to conserve battery power. To turn Meter back on after auto off, press any

button or turn the Rotary Dial. To disable Auto Power Off, hold the Hold/Select

Button when turning the Multimeter on, the APO screen display will disappear.

Page 9For technical questions, please call 1-888-866-5797.Item 59410

SAFETYOPERATIONMAINTENANCE SETUP

Measurement Operation

Note: Remove plugs from

ends of Test Leads (included)

before connecting to Meter.

Note: Test Lead probes have removable

covers for overvoltage protection. With

covers in place, Test Leads are rated for

use with CAT III circuits. Exposed probes

are rated for use with CAT II circuits.

Note: Insert Test Lead into Test Lead Clip

to allow for easier two hand operation.

Buzzer Notification:

1. Input voltage >600V (AC/DC), buzzer

will continuously beep indicating

measure range is at limit.

2. Input current >10A (AC/DC), buzzer

will continuously beep indicating

measure range is at limit.

3. The buzzer will sound five

times continuously 1 minute

before Auto Power Off.

AC Voltage Measurement

Measure AC conductors carrying

up to 600 VAC, 40Hz-400Hz.

WARNING! TO PREVENT SERIOUS

INJURY: Use caution when working

near voltages above 30 VAC rms, 42

VAC peak, or 60 VDC. Voltages this

high present a risk of electric shock.

1. Plug black test lead into COM Jack.

Plug red test lead into VΩmA Jack.

2. Turn Rotary Dial to the (ACV)

position to choose AC voltage.

3. Carefully touch exposed

conductors with tips of probes.

4. Read measured voltage on the Display.

5. When testing is complete, turn

Rotary Dial to OFF, remove

Test Leads and store with Meter.

Note: If voltage is too high,

Display will read OL.

Page 10 For technical questions, please call 1-888-866-5797. Item 59410

SAFETY OPERATION MAINTENANCESETUP

DC Voltage Measurement

Measure DC conductors

carrying up to 600 VDC.

WARNING! TO PREVENT SERIOUS

INJURY: Use caution when working

near voltages above 30 VAC rms, 42

VAC peak, or 60 VDC. Voltages this

high present a risk of electric shock.

Note: If Voltage is unknown, move dial

to the maximum range (600) and adjust

downward according to the readings.

1. Plug black test lead into COM Jack.

Plug red test lead into VΩmA Jack.

2. Turn Rotary Dial to the (DCV)

position to choose DC voltage.

3. Carefully touch exposed

conductors with tips of probes.

4. Read measured voltage on the Display.

5. When testing is complete, turn

Rotary Dial to OFF, remove

Test Leads and store with Meter.

Note: If voltage is too high,

Display will read OL.

Resistance Measurement

WARNING! TO PREVENT SERIOUS

INJURY: To prevent electric shock, turn off

all power and fully discharge capacitors on

the circuit under test before measuring.

Note: When measuring Ohms, start with the

lowest range if the resistance is unknown.

1. Plug black test lead into COM Jack.

Plug red test lead into VΩmA Jack.

2. Turn Rotary Dial to the Ω

(resistance) position.

3. Carefully touch exposed

conductors with tips of probes.

4. Read measured resistance on the

Display. If the reading on the display

shows “OL.”, move the dial to the next

higher range, until a value is displayed.

5. When testing is complete, turn

Rotary Dial to OFF, remove

Test Leads and store with Meter.

Note: When measuring a resistor that is

connected in a circuit or PCB, the measured

value may not be accurate. This is due

to the Meter’s output test current going

through all possible paths between leads.

Note: For low resistance measurements,

short the test leads and record the

resistance displayed. Then connect to

the circuit and subtract the recorded

resistance from the measurement

for the most accurate results.

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