DVM345DI - Multimeter VELLEMAN - Free user manual and instructions

Product Type	Digital Multimeter
Brand	Velleman
Model	DVM345DI
Display	3 1/2 digit LCD, 2000 counts
AC Voltage Range	0 - 750V
DC Voltage Range	0 - 1000V
AC Current Range	0 - 10A
DC Current Range	0 - 10A
Resistance Range	0 - 20MΩ
Capacitance Measurement	20nF - 200µF
Frequency Measurement	Up to 20kHz
Continuity Test	Built-in buzzer
Diode Test	Yes
Transistor Test	hFE measurement
Safety Rating	CAT II 1000V / CAT III 600V
Power Supply	9V battery (6F22 type)
Dimensions	155 x 75 x 35 mm
Weight	Approx. 200g (without battery)
Accessories Included	Test leads, battery, user manual
Maintenance & Cleaning	Clean with a dry, soft cloth. Do not use solvents.
Spare Parts & Repairability	Replacement test leads and battery available. Refer to manual for fuse replacement.

Frequently Asked Questions - DVM345DI VELLEMAN

How do I measure DC voltage with the DVM345DI?

Set the rotary switch to the DCV range (e.g., 200m, 2, 20, 200, 1000). Insert the black lead into COM and red lead into VΩmA. Connect probes across the circuit. Read the display. Always start with the highest range to avoid overload.

How do I measure AC current?

Set the switch to ACA range (e.g., 200µ, 2m, 20m, 200m, 10A). Insert black lead into COM, red lead into VΩmA for low currents or 10A for high currents. Connect the meter in series with the load. Do not exceed the rated current.

How to test continuity?

Turn the dial to the continuity symbol (diode/buzzer). Insert black lead into COM and red lead into VΩmA. Touch probes to the circuit. A beep indicates continuity. Ensure the circuit is de-energized before testing.

What does 'OL' on the display mean?

'OL' stands for Overload. It means the measured value exceeds the selected range. Select a higher range to get a reading. If 'OL' appears on the highest range, the input may be too high and could damage the meter.

How do I replace the battery?

Turn off the meter and remove the test leads. Remove the screw on the back cover. Lift off the cover. Replace the 9V battery (6F22). Reattach the cover and tighten the screw. Observe correct polarity.

How to replace a blown fuse?

Disconnect test leads and turn off meter. Remove back cover. Locate the fuse (typically F200mA/250V). Replace with same rating. Do not use a higher rating to maintain safety.

Can I measure capacitance?

Yes. Set the dial to the capacitance symbol (F). Insert black lead into COM and red lead into VΩmA. Connect probes to the capacitor (discharged). Read value. Discharge the capacitor before measurement.

What safety precautions should I take?

Always use the correct range and leads. Do not exceed the rated voltage/current. Inspect leads for damage. Remove leads when not in use. Never measure voltage on a current or resistance range.

How do I measure frequency?

Set the dial to Hz. Insert black lead into COM and red lead into VΩmA. Connect probes across the signal. The display shows frequency. Input voltage should be within specified range (typically up to 10V RMS).

What is the maximum voltage I can measure?

The DVM345DI can measure up to 1000V DC and 750V AC. For safety, do not exceed these values. Use the 1000V range for DC and 750V range for AC. The meter is CAT II 1000V / CAT III 600V rated.

USER MANUAL DVM345DI VELLEMAN

Thank you for buying the DVM345DI. This device enables the user to measure AC and DC voltages, AC and DC currents, resistance, capacitance and temperature. The device can be interfaced with a computer and the user can also test diodes, transistors and audible continuity.

2. SAFETY

The meter has been designed according to IEC-1010 concerning the safety requirements for electronic measuring instruments with an overvoltage category (CAT II) and pollution 2. Respect the following safety instructions to ensure maximum personal safety and to keep the device itself in good working order:

• Protect yourself against electroshocks.
• Do not use this device for any other application than those described in this manual.
• 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.

2.1. Use

• Never exceed the specified limit values for the various measurement ranges.
• Do not touch unused terminals when the meter is connected to a circuit.
• Place the range selector switch in the highest position if the value to be measured is unknown beforehand.
• Disconnect all test leads from the circuit to be tested prior to selecting a different function.
• When performing measurements on TV's or switching power circuits, the user should keep in mind that voltage surges may occur at test points. These surges may damage the meter.
• Never perform resistance measurements on live circuits.
• 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.

2.2. Symbols

Important information with reference to safety, consult the manual!

Dangerous voltage may be present

Earth ground

Double insulation (Protection class II)

2.3. Maintenance

• Always disconnect the test leads from all current sources before opening the meter.
- Replace blown fuses with an identical one or a fuse with identical voltage and current ratings (15A/250V).
- Do not use the device and have it checked by qualified personnel if anomalies are observed or in case of malfunction.
- Use a damp cloth and a mild detergent to clean the device. Never apply abrasives or solvents to the meter.

3. DESCRIPTION

This device is a professional auto-ranging measuring instrument. All measured values are displayed on a 3 ^3/4 digit LCD. The device is equipped with a 38-segment bar graph and can be used to measure DC & AC voltages (both auto-ranging), DC & AC current, temperature, resistance (auto-ranging) and capacitance. The user can also test diodes, transistors and audible continuity.

3.1. "ON/OFF"-push button

Used to turn the device ON or OFF. The beeper sounds when this button is pushed.

3.2. DC/AC- or Ω-Button

Used to select DC or AC voltage range, DC or AC current range, or range. The beeper sounds when this button is pushed.

3.3. "R-H" button

Press this button to switch to manual operation when the device is in the auto-ranging mode. "R-H" will be displayed. Hold the button for more than one second to return to the auto-ranging mode. Push this button to change the voltage ranges as follows: 4V 40V 400V 1000V .

Push this button to change the resistance ranges as follows: 40M 4M 400k 40k 4k 400

3.4. "B/L"-button

Press this button to turn the back light ON or OFF.

3.5. Input Jacks

This meter has 4 input jacks with overload protection. Connect the black test lead to the "COM"-jack and the red test lead to the following input jacks :

Function Red Lead Connection Input Limit
VDC/VAC V/Ω V/ 250	1000VDC or 750Vrms AC
	VDC or 250Vrms AC
→+○)	V/Ω250VDC or	250Vrms AC
mA mA 4	00mA DC or rms AC
10A 10A	10A DC or rms AC

3.6. Description of the Front Panel

① Display
② "ON/OFF" push button
③ Transistor socket
④ Function switch
⑤ Capacitance or temperature socket
⑥ Input jacks
⑦ RS232C socket
⑧ "B/L"-button
⑨ "R-H" button
⑩ DC/AC- or Ω-button

4. OPERATION

4.1. Voltage Measurements

1. Connect the black test lead to the "COM"-jack and the red test lead to the "V/Ω"-jack.
2. Place the function switch in the V position and connect the test leads to the source you wish to measure.
3. Select the VDC- or VAC-mode with the "DC/AC"-button (push "R-H" for manual range selection).
4. The measured value will be displayed on the LCD. The polarity of the red test lead is indicated with DC measurements.

4.2. Current Measurements

1. Connect the black test lead to the "COM"-jack and the red test lead to the "mA"-jack for measurements up to 400mA. Switch the red test lead to the "10A"-jack for measurements up to 10A.
2. Place the function switch in the "4mA"-, "400mA"- or "10A"-position and use the "DC/AC"-button to select either the DCA- or the ACA-mode.
3. Connect the test leads in series with the load in which the current is to be measured.
4. The measured value will be displayed on the LCD. The polarity of the red test lead is indicated with DC measurements.

4.3. Resistance Measurements

1. Connect the black test lead to the "COM"-jack and the red test lead to the "V/Ω"-jack. The polarity of the red test lead is positive (+).
2. Place the function switch in the "Ω"-range to be used and connect the test leads to the resistance you wish to measure.

NOTE :

The device may need a few seconds to produce a stable reading when measuring resistances in excess of 1MΩThis is entirely normal.
The message "OL" and the full bar graph will be displayed if the input is not connected, e.g. with an open circuit.
- Disconnect the circuit to be tested and make sure that all capacitors have been fully discharged before measuring the in-circuit resistance.

4.4. Capacitance Measurements

1. Place the function switch in the "nF"-position.
2. Make sure that the capacitor has been fully discharged prior to connecting the capacitor to the capacitance socket.

WARNING :

Disconnect all test leads from the circuit to be tested before inserting the capacitor in the capacitance socket. Make sure that no components are connected to this socket when performing voltage measurements with test leads.

4.5. Temperature Measurements

1. Place the function switch in the "TEMP"-position.
2. Connect the "K"-type thermocouple with the temperature socket on the front panel and contact the object in question with the thermocouple.

WARNING :

Remove the thermocouple before selecting a different function in order to avoid electroshocks. Do not connect the thermocouple to the "TEMP"-socket unless all test leads have been disconnected from the circuits you wish to test.

4.6. Audible Continuity Test

1. Connect the black test lead to the "COM"-jack and the red test lead to the "V/Ω"-jack. The polarity of the red test lead is positive (+).
2. Place the function switch in the "○")"-position and push the "Ω/○")"-button on the front panel.
3. Connect the test leads with two points of the circuit you wish to test. The built-in buzzer will sound if continuity exists (for resistances < 30 .

4.7. Diode Test

1. Connect the black test lead to the "COM"-jack and the red test lead to the "V/Ω"-jack. The polarity of the red test lead is positive (+).
2. Place the function switch in the "→" position.
3. Connect the red test lead to the anode and the black test lead to the cathode of the diode to be tested.
4. The forward voltage drop of the diode will be displayed on the LCD.

4.8. Transistor Test

1. Place the function switch in the "hFE"-position.
2. Determine whether the transistor is NPN or PNP and locate the emitter, base and collector leads. Insert the leads into the proper holes of the hFE-socket on the front panel.
3. The display will show the approximate hFE-value at the moment of testing. Base current 10 A , Vce 3.0V.

WARNING :

Disconnect all test leads from the circuit to be tested before connecting the transistor with the hFE-socket. Make sure that no components are connected to the hFE-socket when performing voltage measurements with test leads.

4.9. Interfacing the Meter with a PC

1. Run the RS232C-cable from the computer's serial ports to the meter.
2. Press "ON/OFF" to activate the meter and turn on the computer.

WARNING :

1. Only use a RS232C serial interface cable. Do not attempt to modify the length of this cable.
2. Please read the information on the supplied disk.

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 Ground : 1000VDC or 750 Vrms AC (sine wave)

Power Supply : 9V-battery (NEDA1604 or 6F22)

Ranging Method : Auto/Manual

Display : 3 34 digit LCD, 38-segment bar graph

Overrange Indication : "OL" appears on display

Polarity Indication : "-" is displayed automatically

Battery-Low Indication : The " "-symbol's displayed

Operating Temperature : 5 to 35°C (41 to 95°F)

Storage Temperature : -10 to 60°C (14 to 140°F)

Dimensions : 78 x 186 x 35mm

Weight : 300g (including battery)

5.2. DC Voltage

Range	Resolution	Accuracy
4V	1mV	±0.5% of rdg ± 3 digits
40V	10mV
400V	0.1V
1000V 1V ±0.8% of rdg ± 3 digits

Input impedance : 10MΩ.

5.3. AC Voltage

Range	Resolution	Accuracy
4V	1mV	±1.2% of rdg ± 5 digits
40V	10mV
400V	0.1V
750V 1V ±1	.5% of rdg ± 5 digits

Input impedance : 10MΩ
Response : average response, calibration in rms of a sine wave.
Frequency range : 40Hz – 400Hz.

5.4. Resistance

Range	Resolution	Accuracy
400Ω	0.1Ω	±1.2% of rdg ± 3 digits
4kΩ	1
40kΩ	10Ω
400kΩ	0.1kΩ
4MΩ	1kΩ
40MΩ	10kΩ	±3.0% of rdg ± 5 digits

Max. open-circuit voltage : 3.0V.
Overload protection : 250VDC or 250Vrms AC for all ranges.

5.5. DC Current

Range	Resolution	Accuracy
4mA	1μA	±1.2% of rdg ± 3 digits
400mA	0.1mA	±1.2% of rdg ± 3 digits
10A	10mA	±2.0% of rdg ± 8 digits

Overload protection : 15A/250V-fuse for the 10A-range.

5.6. AC Current

Range	Resolution	Accuracy
4mA	1μA	±1.5% of rdg ± 8 digits
400mA	0.1mA	±1.5% of rdg ± 8 digits
10A	10mA	±3.0% of rdg ± 8 digits

Overload protection : 15A/250V-fuse for the 10A-range.

Frequency range : 40 to 400Hz

Response : average response, calibration in rms of a sine wave.

5.7. Capacitance

Range	Resolution	Accuracy
4nF	1pF	±4.0% of rdg ± 5 digits
400nF 0.1nF	±4.0% of rdg ± 5 digits

5.8. Temperature

Range	Resolution	Accuracy
0 to 400°C 1°C	±3.0% of rdg ± 3 digits
401 to 750°C 1°C	±3.0% of rdg ± 5 digits

5.9. Audible Continuity

Function	Description
○)	Built-in buzzer sounds if continuity exists (< 30Ω)

5.10. Diode

Function Resolution Test Current Open-Circuit Voltage
	1mV	25μA	3.0V

5.11. Transistor

Function	Range	Base Current	Vce
hFE	1 to 1000	10μA	3.0V

6. ACCESSORIES

• User manual
• Set of test leads
• 9V-battery (NEDA1604 or 6F22)
• "K"-type thermocouple
• Holster
• RS232C-cable
• 1 disk of 1.44MB