DVM52IT - Multimeter VELLEMAN - Free user manual and instructions

Product type	Digital multimeter
Brand	Velleman
Model	DVM52IT
Dimensions	Approx. 150 x 70 x 30 mm
Weight	Approx. 200 g (with battery)
Power supply	9 V battery (type 6LR61)
Display	LCD, 3 1/2 digits (2000 counts)
DC voltage	200 mV to 600 V
AC voltage	200 V to 600 V
DC current	200 µA to 10 A
Resistance	200 Ω to 2 MΩ
Continuity test	Yes, with audible signal
Diode test	Yes
Safety category	CAT II 600 V
Maintenance and cleaning	Wipe with a clean, dry cloth
Consumables / spare parts	9 V battery, fuses (if applicable), set of test leads
Repairability	Battery and fuse replacement by user
Included accessories	Test leads, battery

Frequently Asked Questions - DVM52IT VELLEMAN

How to measure DC voltage with the DVM52IT?

Turn the selector to the appropriate V DC (DC voltage) range (e.g., 200 V or 600 V). Connect the red probe to the VΩmA terminal and the black to COM. Place the probes in parallel across the circuit. Read the value on the LCD screen.

How to change the multimeter battery?

Make sure the device is turned off. Remove the back cover by unscrewing the screws. Replace the old battery with a new 9 V battery (type 6LR61). Close the cover and screw it back.

Which range to use for measuring resistance?

Select the Ω range closest to the expected value. Start with the largest range (2 MΩ) and go down if necessary. For an accurate measurement, disconnect the resistor from the circuit.

How to test continuity of a wire?

Turn the selector to the diode/continuity symbol (usually a diode or speaker symbol). Connect the probes to COM and VΩmA. Place the probes at the ends of the wire. An audible signal indicates continuity.

What to do if the screen displays '1' or 'OL'?

This means the measurement exceeds the selected range (overload). Switch to a higher range. For example, if you are measuring a 12 V voltage on the 200 mV range, switch to 20 V or 200 V.

Can I measure AC current with this multimeter?

Yes, the DVM52IT can measure AC current up to 10 A. Select the AC A range, connect the red probe to the 10A terminal for high currents, and place the multimeter in series in the circuit.

How to clean the multimeter?

Use a soft, dry cloth to wipe the case and screen. Do not use chemicals or abrasives. Remove the battery if not using for an extended period.

What safety symbols should be observed?

Respect the indicated overvoltage category (CAT II 600 V). Never measure voltages above 600 V. Use appropriate test leads and check their insulation.

How to replace a fuse?

Turn off the device and remove the test leads. Open the back cover. Locate the fuse (often 20 mm x 5 mm type). Replace it with a fuse of the same rating (e.g., 0.5 A / 250 V). Close.

What to do if the display flickers or is unstable?

Check that the battery is sufficiently charged. If the problem persists, try changing the test leads or cleaning the contacts. Make sure the selector is on the correct function.

USER MANUAL DVM52IT VELLEMAN

DVM52IT – DIGITAL INSULATION TESTER

1. Introduction & Safety Prescriptions

CE velleman®

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 buying the DVM52IT! Please read the manual carefully before bringing this device into service.

The meter was designed according to IEC 348 and according to IEC-1010 concerning the safety requirements for electronic measuring instruments with an overvoltage category (CAT II) and pollution 2. This manual contains a number of safety prescriptions that must be followed to the letter. Read these instructions before using the device!!

Injury or death can occur even with low voltages and low current. Consequently it is extremely important that you read these safety instructions before using your device. Follow all safety and operating procedures as described in this manual.

• Protect yourself against electroshocks.
• Do not use this device for any other application than those described in this manual.
• Make sure the device was not damaged in transit.
• Make sure the insulation of the test leads is not damaged and/or the wire itself is not exposed.
• Full compliance with safety standards can only be guaranteed if the device is used with the supplied test leads. If necessary, they should be replaced with identical leads or leads with identical electric ratings. All test leads should be in good working order.
• Never exceed the specified limit values for the various measurement ranges.
• Do not touch unused terminals when the meter is connected to a circuit.
• Do not measure voltages > 1000V above earth ground.
• Exercise extreme caution when working with voltages in excess of 60VDC or 30Vrms AC. Keep your fingers behind the probe barriers while using the device.
• Do not connect the leads to a voltage source while the function switch is in one of the following modes: insulation resistance, resistance or continuity.
• Never perform measurements on live circuits.
• Disconnect all test leads from the circuit to be tested prior to selecting a different function or range.
• Have the device checked by a qualified technician in case of malfunction.
• Never use the meter if the back panel is not in place and firmly fixed.
• Do not use or store the device in areas exposed to direct sunlight, high temperatures or high humidity.

2. Symbols

Important information with reference to safety, consult the manual!

Double insulation (Protection class II)

Earth ground

Low battery

AC (alternating current)

DC (direct current)

Continuity buzzer

3. Maintenance

• Do not remove the back cover while a voltage is being applied. Only a qualified technician should handle repairs.
  • Always disconnect the test leads from all current sources before opening the meter.
  • Always place the function and range switches in the OFF position when the device is not in use.
• Remove the batteries to keep them from leaking if the device is to be stored for a prolonged period of time.
• Use a damp cloth and a mild detergent to clean the device. Never apply abrasives or solvents to the meter

4. Description

General

• This digital insulation tester is equipped with two alarm functions. A humming sound is produced every two seconds to prevent damage from improper operation when the function or range switch is in the wrong position.
• Press the test button and the alarm system will produce a humming sound every two seconds. The high voltage output indicator will flash red, warning the operator of the risk of electroshocks because of the high output voltage.
• The device is protected against overload and a low-battery indication is provided.
• The device also has a data-hold function.
• Two rotary switches are used to select the functions and ranges.
• The DVM52IT has a test button that can be locked. Releasing the test button automatically discharges the capacitance of the device.

Front & Back Panel

1. High voltage output indicator
2. LCD display
3. Front panel
4. Test button
5. Data-hold switch
6. Function switch
7. Range switch
8. HIGH jack
9. LOW jack
10. Battery cover
11. Case

5. Specifications

Max. accuracy is achieved during a one-year period after calibration. Ideal circumstances require a temperature of 18 to 28°C (64 to 82°F) and a max. relative humidity of 75%.

5.1 General Specifications

Max. voltage between terminals and earth 1000V dc or ac

Measuring Method Dual-slope integration A/D converter

Sampling Time ±0.4sec.

LCD Height 22mm

Max. Display 1999 points (3 ½ digits)

Polarity Indication ‘-’ indicates negative polarity

Overrange Indication '1' or '-1' is displayed

Displayed Measuring Unit Unit of electrical capacity

Power Supply 6 AA-batteries of 1.5V (alkaline batteries are recommended)

Power Consumption ±5mA (100Vdc, 750Vac, 200Ω,)

±30mA (200MΩ, 250V)

±50mA (200MΩ/500V)

±100mA (2000MΩ/1000V)

Battery-Low Indication

Operating Temperature

Operating Humidity

Storage Temperature

Dimensions

Weight

“-+”-symbol is displayed

0 to 40°C (32 to 104°F)

< 85%RH

-10 to +50°C (10 to 122°F)

192 x 122 x 55mm

± 545g (with batteries)

5.2 Electrical Specifications

5.2.1. Insulation Resistance

Range	200MΩ / 250V	200MΩ / 500V	2000MΩ / 1000V
Test Voltage	250Vdc ± 10%	500Vdc ± 10%	1000Vdc ± 10%
Measuring Ranges	0 ~200MΩ	0 ~200MΩ	0 ~2000MΩ
			0 ~1000MΩ	1000 ~2000MΩ
Accuracy	± 3% rdg ± 5 digits			± 5% rdg ± 5 digits
Output Voltage on Open Circuit	250V ± 10%	500V ± 10%	1000V ± 10%
Min. Output Voltage	225V at 0.25MΩ	450V at 0.5MΩ	900V at 1MΩ
Test Current (approx.)	1mA at 0.25MΩ	1mA at 0.5MΩ	1mA at 1MΩ
Output Short-Circuit Current	≤ 2.5mA

5.2.2. AC Voltage

Range	Resolution Accuracy
700V	1V	±1.2% of rdg + 5 digits

Input Impedance

Max. Input Voltage

Frequency Range

Response

10MΩ

700V rms AC or 1000V DC

40 to 400Hz

average, calibrated in rms of a sine wave

5.2.3. DC Voltage

Range Resolution Accuracy
1000V 1V ±0.8% of rdg + 3 digits

Input Impedance 10MΩ

Max. Input Voltage 1000V DC or 700V rms AC

5.2.4. Resistance

Range Resolution Accuracy
200Ω 0.1Ω		±1.0% of rdg + 3 digits

5.2.5. Continuity

Range Function
○○○	Built-in buzzer sounds if continuity exists (resistance < 50Ω)

Open Circuit Voltage ±2.5V

Overload Protection 250V DC or rms AC

6. Operating Instructions

6.1. Selecting the Appropriate Function and Range

When measuring AC voltage, DC voltage or resistance or when performing a continuity test, you should place the function switch in the 200^•• , 700V\~, 1000V—position. Place the range switch in the 200^•• , 700V\~ or 1000V—position.

When measuring insulation resistance, you should place the function switch in the MANU., LOCK 1min., LOCK 2min. or LOCK 4min. position. The device will produce a humming sound every 2 seconds and the display will show a random reading if either the range or the function switch is in the wrong position.

6.2. Sonorous and Visual Alarm Signals

The device will emit a humming sound every two seconds and the red high voltage output indicator in the top right-hand corner of the LCD will flash if the test button is pressed while the insulation range is selected.

6.3. Data-Hold Function

Simply toggle the hold switch to the right if you want to hold a particular value while measuring. The data-hold symbol appears on the LCD. Slide the switch to the left again to leave the data-hold mode.

6.4. Manual Operation and Using the Test Button

When measuring insulation, you can rotate the function switch to the "MANU." position. The meter is now operated manually. The measurement begins when you press the test button. For prolonged measurements it can be very practical to lock the test button: just press the button and turn it anticlockwise. You can place the function switch in the LOCK 1min., LOCK 2min. or LOCK 4min. position to perform measurements of the indicated duration. Simply place the function switch in the MANU. position again if you want to interrupt your measurements before the 1, 2 or 4 minutes are up.

6.5. Preparing for Measurements

When the △ symbol is printed beside on of the jacks, this means that the indicated limit values must be respected in order to protect the inner circuits from damage.

The low-battery sign indicates that the batteries should be replaced. This symbol is displayed when the battery voltage drops below 7V.

6.6. Measuring Insulation Resistance

Insulation tests should only be conducted on deactivated circuits. Connect the DVM52IT and the circuit in question with test leads and press the test button to execute the test.

1. Select the required test mode (MANU., LOCK 1min., LOCK 2min., LOCK 4min.) with the function switch.
2. Select the required range (200MΩ/250V, 200MΩ/500V, 2000MΩ/1000V) with the range selector.
3. Connect the black test lead with the LOW jack and the red test lead with the HIGH jack.
4. Connect the test leads with the circuit to be tested.
5. Press the test button. In the manual mode, you can press and then rotate the test button anticlockwise to lock it.
6. Read the measured value from the LCD.

Never touch the circuit under test during your measurements. Do not rotate the range switch while the test button is in the depressed position.

When your measurements are completed you must release the test button before the test leads are disconnected. This is because the system is charged up and must be allowed to discharge through the tester's internal discharge resistor.

6.7. Measuring AC Voltage

1. Connect the black test lead with the LOW jack and the red test lead with the HIGH jack.
2. Put the function switch in the 200 , 700V 1000V position.
3. Put the range switch in the 700V\~position.
4. Connect the test leads with the source or load to be tested.
5. Read the measured value form the LCD.

The △ symbol indicates that the limit values of 700V rms AC and 1000V DC have to be respected. It may be possible to measure higher voltages, but this may destroy the inner circuit. Be careful to avoid electroshocks when performing measurements.

6.8. Measuring DC Voltage

1. Connect the black test lead with the LOW jack and the red test lead with the HIGH jack.
2. Put the function switch in the 200 , 1000V, or 700V\~ position.
3. Put the range switch in the 1000V position.
4. Connect the test leads with the source or load to be tested.
5. Read the measured voltage and the polarity of the red lead connection from the LCD.

The symbol indicates that the limit values of 700V rms AC and 1000V DC have to be respected. It may be possible to measure higher voltages, but this may destroy the inner circuit. Be careful to avoid electroshocks when performing measurements.

6.9. Measuring Resistance

Disconnect the circuit to be tested and make sure that all capacitors are fully discharged before measuring the in-circuit resistance.

1. Connect the black test lead with the LOW jack and the red test lead with the HIGH jack.
2. Put the function switch in the 200 , 000V . 700V position.
3. Place the range switch in the 200Ω position.
4. Connect the test leads with the resistance under measurement.
5. Read the value from the LCD.

REMARKS

• The LCD displays the overrange indication "1" if the measured value is too high for the range you are using. Select a higher range.
• The overrange indication "1" is displayed when the input is not connected e.g. in case of an open circuit.

6.10. Continuity Test

1. Connect the black test lead with the LOW jack and the red test lead with the HIGH jack.
2. Put the function switch in the 200 , 000V, or 700V\~ position.
3. Place the range switch in the position.
4. Connect the test leads with two points of the circuit to be tested.
5. The built-in buzzer will sound if continuity exists (resistance < 50Ω).

7. Maintenance

7.1. Replacing the Batteries

Disconnect the test leads from the circuit to be tested before removing the battery cover. This is necessary to avoid the risk of electroshocks.

1. The batteries need to be replaced when the sign appears on the LCD.
2. Open the battery cover with the included screwdriver.
3. Replace the old batteries with new ones.
4. Replace the battery cover.

7.2. Replacing the Test leads

Only when you use the supplied test leads can we guarantee that you are complying fully with the safety standards. If necessary, they should be replaced with test leads of the same model or with the same ratings. Electric ratings of the test leads: 1000V 5A. Replace the test leads if the lead is exposed.

8. Accessories

• plastic case
  • test leads (electric ratings 1000V / 5A)
• carrying bag for DVM52IT (without accessories)
• 6 x AA-battery of 1.5V
• manual
• screwdriver

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.

DVM52IT – DIGITALE ISOLATIETESTER

Bemonsteringsfrequentie ±0.4sec.

LCD hoogte 22mm

±100mA (2000MΩ/1000V)

±100mA (2000MΩ/1000V)

±100mA (2000MΩ/1000V)