velleman DVM830 Digital Multimeter User Manual

**USER MANUAL
DVM830
DIGITAL MULTIMETER – 3 ½ DIGITS

**

Introduction

To all residents of the European Union
Important environmental information about this product
This symbol on the device or the package indicates that disposal of the device after its lifecycle could harm the environment.
Do not dispose of the unit (or batteries) as unsorted municipal waste; it should be taken to a specialized company for recycling.
This device should be returned to your distributor or to a local recycling service.
Respect the local environmental rules.
If in doubt, contact your local waste disposal authorities.
Thank you for choosing Velleman! Please read the manual thoroughly before bringing this device into service. If the device was damaged in transit, don’t install or use it and contact your dealer.
The DVM830 is a professional low-cost digital multimeter with a 3 ½ digit LCD display. It is ideally suited for field, lab, shop, and home applications. By using the latest in IC and display technology to significantly reduce the number of discrete internal components, the multimeter gives you superb measuring capability as well as the highest possible reliability.

1.1. Warning
Use extreme caution in the use of this device. Improper use of this device can result in injury or death. Follow all safeguards suggested in this owner’s manual in addition to normal safety precautions in dealing with electrical circuits. Do not use this device if you are unfamiliar with electrical circuits and testing procedures. Not for commercial or industrial use.

1.2. A Word about Safety
Measurement category II is for measurements performed on circuits connected to the low voltage installation. This multimeter is designed to ensure the safest operation possible. However, safe operation depends on the operator. Make sure to follow these simple safety rules:

• Never apply a voltage to the multimeter that exceeds the limits given in the specifications.
• Never apply more than 600VDC or VAC RMS between an input jack and ground.
• Use extreme caution when working with voltages above 60VDC or 30VAC RMS.
• Always discharge filter capacitors in the power supply circuit under test before you attach teleads.
• Never connect to a source of voltage when you select the DCA, resistance measurement.
• Always turn off power and disconnect the test leads before you replace the batteries or fuseNever operate the multimeter unless the battery cover is in place and fully closed.
• When carrying out measurements on TV or switching power circuits, always remember that there may be high amplitude voltages pulses at test points which can damage the meter.
• Never use the multimeter to measure currents on circuits that contain voltages higher than 240VAC.
• Make sure to disconnect the test leads from any circuit before testing transistors. Components should not be connected to the hFE sockets when measuring voltage.

1.3. Maintenance
Your DVM830 is an example of superior design and craftsmanship. The following suggestions will help you care for the multimeter so you can enjoy it for years:

• Keep the multimeter dry. If it gets wet, wipe it dry immediately.
• Use and store the multimeter only in normal temperature environments. Temperature extremes can shorten the life of electronic devices or damage batteries.
• Handle the multimeter gently and carefully. Dropping it can damage the circuit boards and case and can cause the multimeter to work improperly.
• Use only fresh batteries of the required size and type. Always remove old or weak batteries.
• If you do not plan to use the multimeter for a month or more, remove the batteries. This protects the multimeter from possible leakage.
• Disconnect the test probes before opening the multimeter.
• Replace blown fuses only with same size and type: F: F 0.2A/250V
• If any faults or abnormalities are observed, do not use this device and let it check by authorised personnel.
• Never use the meter unless the back cover is in place and fastened fully.
• To clean the meter, use a damp cloth and mild detergent only, do not use abrasives or solvents.

Front Panel Description

1. display
2. RANGE and FUNCTION switch
3. transistor test socket
4. input connector COM
5. input connector VΩmA
6. input connector 10ADC

Operating Instructions

3.1. DC Voltage Measurement

1. Connect the black lead (-) to the COM input connector and the red lead (+) to the VΩmA input connector.
2. Set the FUNCTION switch to the DCV range to be used and connect the test leads across the source or load under test.
3. Read LCD display. The polarity of the RED lead connection will be indicated.

Remark : If the voltage range is not known set the FUNCTION switch to a high range and work down.

This is a category II measuring device and can only be used for measurements on low-voltage networks.

3.2. AC Voltage Measurement

1. Connect the black lead (-) to the COM input connector and the red lead (+) to the VΩmA input connector.
2. Set the FUNCTION switch to the ACV range to be used and connect the test leads across the source or load under test.
3. Read LCD display.

Remark : If the voltage range is not known set the FUNCTION switch to a high range and work down.
This is a category II measuring device and can only be used for measurements on low-voltage networks.

3.3. DC Current Measurement

1. Connect the black test lead (-) to the COM input connector and the red test lead (+) to the VΩmA input connector for a maximum of 200mA. For a maximum of 10A move the red test lead to the 10ADC input connector.
2. Set the FUNCTION switch to the DCA range.
3. Connect the test leads IN SERIES with the load under measurement.
4. Read LCD display. The polarity at the RED test lead connection will be indicated.

Remark : if the current range is not known, set the FUNCTION switch to a high range and workdown.
This is a category II measuring device and can only be used for measurements on low-voltage networks.

3.4. Resistance Measurement

1. Connect the black lead (-) to the COM input connector and the red lead (+) to the VΩmA input connector.
2. Set the FUNCTION switch to the Ω range and connect the test leads with the load under measurement.

Remarks:

1. When the input is not connected, i.e. at open circuit, the figure “1” will be displayed for the over-range condition.
2. When checking in circuit resistance, be sure the circuit under test has all power removed and that all capacitors are fully discharged.

3.5. Diode Measurement

1. Connect the black lead (-) to the COM input connector and the red lead (+) to the VΩmA input connector.
2. Set the FUNCTION switch to the range and connect the test leads across the diode, display shows the approx. forward voltage on this diode.

3.6. Transistor hFE Test

1. Set the FUNCTION switch to the hFE range.
2. Determine whether the transistor is NPN or PNP and locate the Emitter, Base and Collector leads. Insert the leads into the proper holes in the socket on the front panel.
3. The display will read the approximate hFE value.

Specifications

Accuracy is specified for a period of one year after calibration and at 18°C to 28°C (64°F to 82°F) with relative humidity to 75%.

4.1. General

range 10A: none
Power supply| 9V battery
Ranging method| manual
Polarity indication| “-” displayed
Over-range indication| “1” displayed automatically
Operating temperature| 0°C to 35 °C
Storage temperature| -15°C to 50 °C
Dimensions| 126 x 70 x 24mm
Weight| 170g

4.2. DC Voltage

Maximum input voltage: 600VDC or peak AC

4.3. AC Voltage

Max. input voltage: 600V
Frequency range: 40Hz to 450Hz

4.4. DC Current

Overload protection: F 0.2A fuse (10A not fused)
May only be used for measurements on low-voltage networks (max. 240V)

4.5. Resistance

Maximum open circuit voltage: 2.8V
Overload protection: 220VDC / AC RMS on all ranges

4.6. Diode

Over-current protection: 220V DC/AC

4.7. Transistor hFE

Accessories

Test leads, battery (9V), this operating manual.

Battery and Fuse Replacement

Remove screws on the back cover and open the case. Replace the exhausted battery with a new one.
Fuse rarely needs replacement and blows usually as a result of the operator’s error. Open the case as mentioned above and replace the blown fuse with ratings specified: F: F 0.2A/250V
Remark: Before attempting to open the case, be sure that test leads have been disconnected from measurement circuit to avoid electric shock.

Use this device with original accessories only. Velleman nv cannot be held responsible in the event of damage or injury resulted from (incorrect) use of this device.
For more info concerning this product, please visit our website www.velleman.eu.
The information in this manual is subject to change without prior notice.

References

• Details – Own brands – Velleman – Wholesaler and developer of electronics
• Velleman – Wholesaler and developer of electronics

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