Velleman DCM97K User Manual

DCM97K version 2 versie 2 version 2

Separable Meter :

Digital Multimeter & AC Current Transducer

Afneembare Meter :

Digitale Multimeter & AC Stroomtang

Mètre séparable :

multimètre numérique & pince ampèremétrique CA

User Manual Gebruikershandleiding Manuel d'Utilisation

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DCM97K -- Separable Meter :

Digital Multimeter (DMM) & AC Current Transducer

1. INTRODUCTION

Thank you for buying the DCM97K ! We are confident that this multifunctional device will serve you well for many years to come.

This is a separable meter consisting of a digital multimeter (DMM) and an AC current transducer. The DMM can be used individually for DC & AC voltage measurements and for measuring resistance, diodes and continuity. The meter can be used to measure AC currents when the AC current transducer is mounted firmly on the DMM.

The multimeter has been designed in accordance with IEC-1010 concerning safety requirements for electrical measuring instruments and hand-held current clamps.

See figure 1.

AC CURRENT TRANSDUCER

DMM

FIGURE 1

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PART 1 : THE DIGITAL MULTIMETER (DMM)

1. SAFETY INFORMATION

This multimeter has been designed in accordance with UL1244 and IEC-1010 concerning safety requirements for electronic measuring instruments with an overvoltage category (CAT II) and pollution 2. Follow all safety and operating instructions to ensure that the meter is used safely and is kept in good working order.

1.1. Preliminary The user should observe all standard safety rules :

l Do not abuse the device. l Full compliance with safety standards can be guaranteed only if the device is

used with the supplied test leads. If necessary, they should be replaced with identical leads or leads with identical electronic ratings. All measuring leads should be in good condition.

1.2. Use

l Observe a warm-up delay of at least 60 seconds. l The display may become unstable and the readings inaccurate if the multimeter

is used in the vicinity of noise-generating equipment.

l Never exceed the limit values of the various measurement ranges as indicated

in this manual.

l Disconnect all test leads from circuits that are currently being tested before

selecting a different function.

l Never perform resistance measurements on live circuits. l Always be careful when working with voltages in excess of 60VDC or 30Vrms

AC.

l Keep your fingers behind the probe barriers while using the device.

1.3. Symbols

Important safety information, consult the manual. Earth ground

Double insulation (Protection Class II)

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FIGURE 2

1.4. Maintenance

l Always disconnect the test leads from energised circuits before opening the

housing or the battery compartment.

l Refrain from using the device and have it repaired by qualified personnel in

case of malfunction.

l Do not use the meter unless the back panel and the battery cover are in place

and securely fastened.

l Use a damp cloth and mild detergent for cleaning purposes. Never apply

abrasives or solvents to the meter.

2. DESCRIPTION

This meter is a professional auto-ranging measuring instrument. Consult figure 2 and read the explanation for the various numbered controls in order to familiarise yourself with the functions and keys of the front panel.

 Digital Display All measured values are displayed on an

LCD with 3200 points. The device is equipped with a 33-segment analogue bar graph. The device provides an automatic polarity indication, decimal point, AC & DC range indication, unit indicators, MΩ or KΩ

or Ω and various symbols :

, ,

," ".

ó Function Switch ("FUN. ") Used to select the desired function and

range.

ì "COM"-input Terminal Ground input connector.

ö "V-Ω"-input Terminal Positive input connector for measuring

tension, resistance and diodes.

ú "RAN."-key (Manual Range) Push this key to select the manual range selection mode or to change ranges.

Push the RANGE key once to make the RANGE indicator appear on the LCD.

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Push the RANGE key again to select the desired range. Hold the RANGE key for two seconds in order to return to the autoranging mode.

÷ "FUN."-key Push the blue "FUN."-key to alternate between AC & DC voltage measurement

if the device is in the in the voltage mode. Push the key to alternate between resistance, continuity or diode measurement if the device is in the Ω

mode.

ø "Hold"-key "

"

This key is used to freeze the measured value for all functions. The "

" symbol is displayed when this function is used. Measurements are still performed but the display is not updated.

í Back Light Key

This key is used to activate the back light. The light is deactivated automatically

after approx. 5 seconds. Press the key again to reactivate the back light.

3. SPECIFICATIONS

Max. accuracy is achieved during a one-year period after calibration, at a

temperature of 18 to 28°C (64°F to 82°F) and a max. relative humidity of 80%.

3.1. General Specifications Max. Voltage between

Terminals and Earth : 600VDC or 600Vrms AC (sine wave) Max. Altitude : 2000m Installation Category : CAT II 600V Pollution Degree : Level II

Power Supply : 2 x 1.5V AAA-batteries of the IEC LR03 type

Display : LCD, 3200 points, 33-segment bar graph Ranging Method : Auto / manual

Overrange Indication : "OL" or "-OL"

Polarity Indication : "-" displayed automatically Battery-Low Indication : "

" is displayed Operating Temperature : 0 to 50°C (32 to 122°F) Storage Temperature : -10 to 60°C (14 to 140°F) Temperature Coefficient : 0.15 x (specified accuracy)/°C, <18°C or >28°C Dimensions : 54 (W)x 165 (L) x 28 (H) mm Weight : 120g Auto Power-Off : Approx. 10 minutes

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3.2. DC voltage

Range Resolution Accuracy

300mV 100µV

3V 1mV

30V 10mV 300V 100mV 600V 1V

± 0.7% of rdg -- 2 digits

Input Impedance : 10MΩ Overload Protection : 600VDC or 600Vrms AC

3.3. AC voltage

Range Resolution Accuracy

3V 1mV

30V 10mV 300V 100mV 600V 1V

± 0.8% of rdg -- 3 digits

Input Impedance : 10MΩ Frequency Response : 40Hz - 400Hz, 40Hz - 200Hz for the 3V-range Overload Protection : 600VDC or 600Vrms AC

3.4. Resistance

Range Resolution Accuracy

300Ω 0.1Ω

3KΩ 1Ω

30KΩ 10Ω

300KΩ 100Ω

3MΩ 1KΩ

± 1.2% of rdg -- 2 digits

30MΩ 10KΩ ± 2.0% of rdg -- 5 digits Overload Protection : 250VDC or 250Vrms AC Open-Circuit Voltage : approx .1.3V

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3.5. Diode and Audible Continuity Test

Range Description Test Condition

Display reads approximate forward voltage of diode

Forward DC current approx. 1.5mA. Reversed DC voltage

approx. 3V Built-in buzzer sounds if resistance < approx. 30Ω

Open-circuit voltage

approx. 1.3V

Overload Protection : 250VDC or 250Vrms AC

3.6. Auto Power Off The meter will automatically deactivate when not used for approx. 10 minutes.

Push the "RAN." key to reactivate the meter.

4. OPERATION

4.1. Voltage measurements

1. Connect the red test probe to the "V-Ω" input terminal and the black test lead to the "COM" terminal.

2. Place the function switch in the "

" position.

3. Push the blue "FUN."-key until the VAC or VDC function is reached.

4. Connect the test probe and the lead to the source to be tested.

WARNING

Do not attempt to measure voltages that might exceed 600VDC or 600VAC in order to avoid electroshocks or damage to the meter. Do not apply more than 600VDC or 600Vrms AC between the "COM" input terminal and the earth.

NOTE The display may become unstable, especially when working in the 300mV-range, even if you do not connect the test probe with the circuit. Short the "V-Ω" terminal and the "COM" terminal and make sure the zero is displayed if you suspect that a particular reading is erroneous.

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4.2. Resistance Measurement

1. Connect the red test probe to the "V-Ω" terminal and the black test lead to the

"COM" terminal.

2. Place the function switch in the "Ω

" position and use the "FUN."-key to

select resistance measurement.

3. Make sure that the tested device is not under tension in order to ensure a

correct reading.

4. Connect the test leads to the resistor to be measured. Short the test leads prior

to performing your measurements in order to obtain maximum accuracy when measuring low resistance values. Memorise the displayed value and, if necessary, subtract the displayed value from the result of the measurement.

NOTE

1. The device may need a few seconds to produce a stable reading when

performing measurements in the 30MΩ-range. This is normal when high resistances are being measured.

2. The overrange indication "OL" will be displayed if the input is not connected,

e.g. with an open circuit.

4.3. Continuity Test (buzzer)

1. Connect the test probe to the "V-Ω" terminal and the black test lead to the

"COM" terminal.

2. Place the function switch in the "Ω

" position and use the blue "FUN."-

key to select the continuity function.

3. Connect the test probe and the lead to the circuit to be measured. The buzzer

will sound if the resistance of the circuit < 30Ω.

4.4. Diode Test

1. Place the function switch in the "Ω

" position and use the "FUN."-key to

select the diode function.

2. Connect the black test lead to the "COM" terminal and the red probe to the "V-

Ω" input terminal.

3. Connect the red test probe to the anode and the black lead to the cathode of

the diode. The meter will display the approx. forward voltage of the diode. Only "OL" will be displayed if the lead connection is reversed.

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4.5. Current Measurements See part two.

5. ACCESSORIES

l AC current transducer l Test lead (black) l Test probe set l Alligator clip (black) l User manual l 2 x 1.5V-battery

6. BATTERY REPLACEMENT

The batteries need to be replaced when the "

"-sign appears on the LCD. Remove the screws of the battery cover and open the cover. Replace the old batteries with two new 1.5V-batteries (supplied).

Note : Please observe all applicable laws when disposing of your old batteries.

WARNING

Make sure that all test leads have been disconnected from the circuit to be measured before opening the battery cover in order to avoid the risk of electroshocks.

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PART 2 : THE AC CURRENT TRANSDUCER

1. SAFETY INFORMATION

The AC current transducer has been designed in accordance with IEC1010 concerning safety requirements for hand-held current clamps. Use the device safely and keep it in good working order by following the instructions in this manual.

1.1. Symbols

2. DESCRIPTION

2.1. Front View Consult fig. 3 and follow the procedure outlined below to familiarise yourself with

the AC current transducer.

 Transformer jaws

Designed to pick up the AC current

flowing though the conductor. ó Hand guard Designed to protect the user.

ì Trigger

Press the lever to open the jaws.

Important safety information, consult the manual.

Double insulation (Protection Class II).

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2.2. Bottom View Consult fig. 4 and follow the procedure outlined below to familiarise yourself with

the device.

 Output plugs

Output terminals

ó Adjusting hole

To be used exclusively by

service personnel.

3. SPECIFICATIONS

Max. accuracy is achieved during a one-year period after calibration, at a

temperature of 18°C to 28°C (64°F to 82°F) and a max. relative humidity of 80%. Accuracy specifications are rendered as follows : ±% of reading ± digits

3.1. General Current Range : 0.1A to 300A AC rms

Output Voltage : 1mVAC per 0.1A AC Working Voltage : 600V CAT II in accordance with IEC1010-1 Maximum Altitude : 2000m Operating Temperature : 0 to 50°C, relative humidity max. 80% Storage Temperature : -20°C to 60°C Sensor type : induction coil capable of sensing AC

current Temperature Coefficient : 0.2 x (spec. accuracy)/°C, <18°C or >28°C Maximum Output Impedance : 45Ω Maximum Jaw Opening : 31mm Maximum Diameter of the Conductor : 29mm Dimensions : 81 x 106 x 31mm Weight : 126g

FIGURE 4

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3.2. Electrical Specifications

Range Measure Output Accuracy

3A 0.030V 300A 30A 0.300V

< 50A, ±3.0% ± 10

300A 3.000V

≥ 50A, ±2.0% ± 5

4. PRECAUTIONS AND PREPARATIONS FOR MEASUREMENT

4.1. Do not apply voltage to the output plugs.

4.2. Do not expose this device to extreme temperatures or excessive humidity and

do not store it where it can be reached by sunlight.

4.3. Do not perform current measurements unless the device is fitted firmly on the

DMM.

4.4. Note that the readings for output voltage may become unstable and/or flawed

if the device is used in the vicinity of noise-generating equipment.

This instrument should not be used on uninsulated conductors at a voltage in excess of 250Vrms AC or 250VDC.

5. AC CURRENT MEASUREMENT

5.1. Select the VAC-function and the 3V-range.

5.2. Connect the transducer with the DMM and consult figure 5.

5.3. Press the trigger to open the jaws and clamp a conductor. Make sure that the

jaws are firmly closed around the conductor and read the value displayed on the LCD.

6. MAINTENANCE

Always use a damp cloth and a mild detergent for cleaning purposes. Never apply abrasives or solvents to the meter. All maintenance, repairs, adjustments and calibration should be carried out by qualified personnel.

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FIGURE 5