General Tools DMM333 User Manual

DMM333

USER’S MANUAL

DIGITAL POCKET

MULTIMETER -

AUTO RANGING

TABLE OF CONTENTS

TITLE PAGE

INSTRUMENT.......................... 3

OVERVIEW

FEATURES ...............................4

SPECIFICATIONS.................... 5-6

SAFETY COMPLIANCE .........7

SAFETY ....................................8-15

INFORMATION

ELECTRICAL ...........................16

SYMBOLS

OPERATING.............................17-25

INSTRUCTIONS

MAINTENANCE ......................26

2

INSTRUMENT OVERVIEW

1. LCD Display

2. Function Select Button

3. Rotary Switch

4. DATA/MAX HOLD Button

5. Test Leads

DMM333

3

FEATURES

• Data Hold, Max Hold Ranging

• Easy to use

• Continuity Beeper, Diode Test

• Auto Power Off

• Low Battery Indicator

• Fast Sampling Rate

• Built-In-Test Leads

4

GENERAL SPECIFICATIONS

FUNCTIONS DMM333

Auto Ranging auto

Display Count 2000

DC Volts Auto 200mV/2/20/ 200/500VDC

DC Volts ±(0.5%+5dgt) Accuracy

AC Volt Auto 2/20/200/500VAC

AC Volts ±(0.8%+5dgt) Accuracy

Resistance Auto 200/2k/20k/

(Ohms) 200k/2M/20MΩ

Resistance ±(0.8%+5dgt)<1MΩ, Accuracy ±(2%+5dgt)≥1MΩ

Diode Test

Continuity (audible)

DC Amps

DC Amps ±(1.8%+5dgt) Accuracy

AC Amps

AC Amps ±(1.8%+5dgt) Accuracy

•

200µ/2000µA/20m/200mADC

200µ/2000µA/20m/200mAAC

5

GENERAL SPECIFICATIONS

FUNCTIONS

Input Impedance (DCV setting)

Auto Off

Data Hold

Max Data Hold

Fuse

Battery Type

Operating Temperature

Storage Temperature

Size(L×W×H)

Weight (including batteries)

DMM333

10M

Ω

•

250mA 250V Fast Fuse

2 “LR44” 1.5V button cell batteries

32° to 140°F

(0°to 40°C) ≤75%RH

14° to 122°F (-10° to 50°C)

≤75% RH

Approx

4.5" x 2.3" x .5" (115 x 58 x 12mm)

Approx 3oz (84g)

6

SAFETY COMPLIANCE

Note: Accuracy is given for one year at 73.4°±5.4°F (23°±3°C) RH<75%

This unit was designed to be safe at least under the following conditions:

• Indoor use

• Altitude: up to 2000m

• Pollution degree: 2

• Ingress protection degree: IP20

• Test leads type: CE, CAT II 500V

and CAT III 300V,1A

• Safety Compliance: IEC61010-1,

2001 CAT II 500V and CAT III 300V

7

SAFETY INFORMATION

To avoid electric shock or injury:

• Do not perform the performance tests or adjustment procedures described in this manual unless you are qualified to do so.

• The information provided in this manual is for the use of qualified personnel only.

• Read “Safety Information” before using this meter.

• This multimeter is battery operated, with a digital display.

• The Meter complies with IEC61010-1，2001 CATII 500V and CATIII 300V. Refer to “General Specifications” for more information.

8

SAFETY INFORMATION

(continued)

• In this manual, a Warning identifies conditions and actions that pose hazards to the user.

• A Caution identifies conditions and actions that may damage the Meter or the equipment under test.

International symbols used on the Meter and in this manual are explained in Table 1 on page 16.

9

To avoid possible electric shock or personal injury, and to avoid possible damage to the Meter or to the equipment under test, comply with the following practices:

1. Do not use the Meter in a manner not specified by this manual or the safety features of the Meter may be impaired.

2. Before using the Meter, inspect the case. Do not use the Meter if it is damaged. Look for cracks or missing plastic. Pay particular attention to the insulation around the connectors.

3. Inspect the test leads for damaged insulation or exposed

10

metal. Check the test leads for continuity. Replace damaged test leads before using the Meter. Only test leads meeting CE, CAT II 500V and CAT III 300V 1A can be used in this multimeter. Replacing test leads should be referred to qualified service personnel only.

4. Verify a Meter’s operation by measuring a known voltage. Do not use the Meter if it operates abnormally. Protection may be impaired. When in doubt, have the Meter serviced.

5. Do not apply more than the rated voltage, as marked on the Meter, between the terminals or between any terminal and earth ground.

11

6. Do not measure voltages above 500 V in Category II, or 300 V in Category III installations.

7. Do not measure voltage when the function/range switch is set on the resistance (ohms) or the current (µA/mA) settings. Never measure current when the meter is set on the resistance range. Never measure AC voltage when the meter is set on DC voltage or DC current settings. Setting the meter on the incorrect function may burn out some of the internal circuitry and may pose a safety hazard.

8. Use caution when working with voltages above 30 V ac rms, 42 V AC peak, or 60 V DC. These voltages pose a shock hazard.

12

9. Use the proper terminals, function, and range for all measurements.

10. Do not operate the Meter around explosive gas, vapor, or dust.

11. When using the probes, keep the fingers behind the finger guards. Do not touch the metal probes of the test leads when making a measurement.

12.When making connections, connect the common test lead before connecting the live test lead; when disconnecting, disconnect the live test lead before disconnecting the common test lead

13.Disconnect circuit power and discharge all high-voltage

13

capacitors before testing resistance, continuity, diodes, or capacitance.

14.For all DC functions, to avoid the risk of shock due to possible improper reading, verify the presence of any AC voltages by first using the AC function. Then select a DC voltage range equal to or greater than the AC range.

15.Before measuring current, you should turn off power to the circuit before connecting the Meter to circuit.

16.Do not operate the Meter with the case (or part of the case) removed.

17.Use only two 1.5V button cell batteries, properly installed in

14

the Meter case, to power the Meter.

18.Replace the battery as soon as the battery indicator “ ” appears. With a low battery, the Meter might produce false readings that can lead to electric shock and personal injury. Don’t replace batteries with the wrong type. Otherwise, you may encounter hazards!

19.Remove test leads from the circuit under test before opening the Meter case.

20.When servicing the Meter, use only specified replacement parts.

15

TABLE 1. ELECTRICAL SYMBOLS

SYMBOL DESCRIPTION

AC (Alternating Current)

DC (Direct Current)

Caution, risk of electric shock Hazardous voltage

Battery (Low battery when shown on the display).

Diode

AC or DC

Fuse

Double Insulated

Risk of danger. Important Information. Refer to the manual.

Earth ground

Continuity/Buzzer

Complies with EU directives

16

OPERATING INSTRUCTIONS

• Data Hold and Max Hold

Press the “H” (Hold) button to hold present reading, and press the “M” (Max Hold) button to hold max reading.

• DC Voltage Measurement

Do not measure voltage higher than 500V. If the voltage is over 1000 VDC, the beeper will sound for warning continuously, designating an over-range measurement.

1.Set the function/range switch to the appropriate DC voltage range.

2.Touch the black test lead to the negative polarity, and touch the red test lead to positive polarity of the circuit to be tested.

17

3.Read the measured voltage on the display. If the test leads are reversed, the “ appear on the display.

red test lead

black test lead

red test lead

black test lead

—

” indicator will

18

• AC Voltage Measurement

Do not measure voltage higher than 500V. It may make damage to internal circuit. If the voltage is over 750 VAC, the beeper will sound for warning continuously, designating an over-range measurement.

1.Set the function/range switch to the appropriate AC voltage range.

2.Measure the voltage by touching the probes to the desired test points of the circuit. With AC voltage, the polarity of the test leads is not a factor.

3.Read the measured voltage on the display.

19

red test lead

black test lead

• Resistance Measurement (Ω)

To avoid electrical shock or damage to the meter when measuring resistance or continuity in a circuit, make sure the power to the circuit is turned off and all capacitors are discharged.

1.Turn the rotary switch to the

appropriate resistance (ohms)

range. Make sure power is disconnected from the circuit to be measured.

2.Measure the resistance by touching the probes to the desired test points of the circuit.

3.Read the measured resistance on the display. When the resistance value is over range,

20

“OL” will be indicated on LCD display.

red test lead black test lead

• Diode Check

1.Turn the rotary switch to the diode/continuity position. Diode check is the default setting, switch functions by pushing the YELLOW button.

2.Connect the red probe to the anode side and the black probe to the cathode side of the diode being tested.

3.Read the forward bias voltage value on the display.

21

4.If the polarity of the test leads is reversed with diode polarity, the display reading shows “OL”. This can be used to distinguish the anode and cathode sides of a diode.

5.For silicon diode, forward bias voltage should be 0.5〜0.8V, for germanium diode, forward bias voltage should be 0.2〜0.3V. A “0 V” reading in both directions indicates a shorted diode. An “OL” reading indicates an open diode. In either case, the diode is defective and should be replaced.

red test lead black test lead

22

• Continuity Measurement

1.Turn the rotary switch to the diode/continuity position. Diode check is the default setting, switch functions by pushing the YELLOW button.

2.If the resistance is under 50 Ω,

the beeper will sound continuously, designating a short circuit. If the meter reads “OL”, the circuit is open.

3.Read the measured resistance on the display. When the resistance value is over range, “OL” will be indicated on LCD display.

red test lead black test lead

23

• DC /AC Current Measurement (µA/mA)

1.Turn the rotary switch to the current range, if the tested current range is unknown, set it to mA setting first.

2.Toggle between AC or DC current measurement by pressing the YELLOW button.

3.Break the circuit path to be measured. Then connect the test leads across the break and apply power.

4.Read the measured current on the display.

5.If the current is over 200mA (under mA setting) or 2000µA (under µA setting), the beeper will sound for warning

24

continuously, designating an over-range measurement.

red test lead

black test lead

• Turn Off

Please set the function switch to the OFF position after using.

The Meter enters the “Sleep mode” and blanks the display if the Meter is not used and the input is inactive for 15 minutes. Press any button to wake the Meter up.

25

MAINTENANCE

If the Meter fails, check the batteries and fuses first, review this manual to make sure that you are operating the Meter correctly.

Disconnect test leads before opening the case or the battery door.

To avoid false readings, which could lead to possible electric shock or personal injury, replace the batteries as soon as the battery indicator “ ” appears.

To prevent damage or injury, install ONLY replacement fuses with the specified amperage, voltage, and interrupt ratings.

26

NOTES

............................................................

27

GENERAL TOOLS & INSTRUMENTS

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PHONE (212) 431-6100

FAX (212) 431-6499

TOLL FREE (800) 697-8665

e-mail: sales@generaltools.com

www.generaltools.com

DMM333 User’s Manual

Specifications subject to change without notice

NOTICE - WE ARE NOT RESPONSIBLE

FOR TYPOGRAPHICAL ERRORS.

MAN#DMM333 6/09

™

General Tools DMM333 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual