LUMEL VA28B Smart Digital Multimeter User Manual

VA28B Smart Digital Multimeter

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Specifications

• Model: VA28B
• Measurement Category: CAT III 600V
• Overvoltage Category: CAT III 600V
• Pollution Degree: 2

Product Usage Instructions

Safety Information

Measurement category III is for the measurements performed on
circuits directly connected to the low voltage installation. Follow
all safety and operating instructions to ensure safe usage. Always
adhere to the following:

• Do not exceed the protection limit for each measurement
  range.

• Avoid measuring voltages exceeding 600V above earth ground in
  category III installations.

• Exercise caution when working with voltages above 60V dc or 30V
  ac rms.

• Avoid performing resistance measurements on live circuits.

• Inspect test leads and probes for any damage before use.

Maintenance

To ensure proper maintenance and safety:

• Always disconnect test leads before opening the case.

• Replace fuse only with specified ratings.

• Do not use the meter if the back cover is not closed
  completely.

• Clean the meter with a damp cloth and mild detergent, avoiding
  abrasives or solvents.

Operating Instructions

This smart digital multimeter can perform various measurements
including:

• SCAN (SMART) Measurement Mode: Select this
  mode for smart measurements.

• Voltage Measurement: Measure AC and DC
  voltage.

• Capacitance Measurement: Measure
  capacitance.

• Resistance Measurement: Perform resistance
  measurements.

• Frequency Measurement: Measure frequency.

• Temperature Measurement: Use K-type
  thermocouple for temperature measurements.

• Diode Test: Test diodes for
  functionality.

• Audible Continuity Test: Check continuity
  audibly.

• LIVE Test: Perform live line tests with only
  one red test lead plugged in.

• Non-contact Voltage Detect (NCV/EF) Test:
  Detect voltage without contact.

FAQ

Q: What should I do if the meter displays an overvoltage

warning?

A: If an overvoltage warning is displayed, immediately
disconnect the meter from the circuit to prevent damage to the
device or its components.

Q: Can I measure resistance on live circuits?

A: It is not recommended to perform resistance measurements on
live circuits to avoid potential hazards and inaccuracies in
readings.

Q: How do I replace the battery or fuse of the meter?

A: Refer to the user manual for detailed instructions on
replacing the battery and fuse of the digital multimeter.

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SMART DIGITAL MULTIMETER
VA28B
USER’S MANUAL
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Spis treci 1. 2. 3. 4. 5. 6. 7.
8. 9.

SAFETY INFORMATION

4

DURING USE

4

SAFETY SYMBOL

4

MAINTENACE

5

GENERAL DESCRIPTION

5

PANNEL AND LCD

6

SPECIFICATION

6

7.2 Non-contact Voltage detect

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7.3 LIVE test

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7.4 Temperature Measurement (K-type thermocouple)

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7.5 Current ((Depending Model))

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7.6 Resistance

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7.7 Continuity Check

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7.8 Diode Test

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7.9 Capacitance (Depending model)

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7.10 Linear Frequency

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7.11 SCAN(SMART) measure mode range

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GENERAL SPECIFICATIONS

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OPERATING INSTRUCTION

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9.1 SCAN (SMART) Measurement Mode

12

9.2 Voltage Measurement

12

9.4 Capacitance Measurement

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9.5 Resistance Measurement

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9.6 Frequency Measruement

13

9.7 Temperature Measurement

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9.8 Diode Test

13

9.9 Audible Continuity Test

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9.10 LIVE Test (ONLY ONE RED TESTLEAD PLUGIN) 14

9.11 Non-contact Voltage Detect (NCV/EF) Test

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2

KEY FUNCTION

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10.1 Hold Key / Backlight Key

14

10.2 FUNC Key / Range Key

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AUTO POWER OFF FUNCTION

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CURREN PLUG-IN DETECT

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DANGER VOLTAGE ALARM

15

BATTERY & FUSE REPLACEMENT

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14.1 To replace the Meter’s battery:

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14.2 To replace the Meter’s fuse:

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WARNING!

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ACCESSORIES

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1. SAFETY INFORMATION
Measurement category III is for the measurements performed on circuits directly connected to the low voltage installation. This meter has been designed according to IEC-61010-1 concerning electronic measuring instruments with an overvoltage category (CAT III 600V) and pollution degree 2. Follow all safety and operating instructions to ensure the meter is used safely and is kept in good condition. With proper use and care, your digital multimeter will give you years of satisfactory service.
2. DURING USE
Never exceed the protection limit indicated in the specifications for each range of measurement.
Never use the meter to measure voltages that might exceed 600V above earth ground in category III installations.
Always be careful when working with voltages above 60V dc or 30V ac rms. Keep fingers behind the probe barriers while measuring.
Do not perform resistance measurements on live circuits Inspect test leads and probes for cracks, breaks or crazes in the insulation before using the meter.
3. SAFETY SYMBOL
Caution: refer to the instruction manual. Incorrect use may result in damage to the device or its components.
~ AC (Alternating Current)
4

DC (Direct Current)
AC or DC
Earth ground
Double insulated
Fuse
Conforms to European Union directives
4. MAINTENACE
Before opening case, always disconnect test leads from all energized circuits. For continuous protection against fire, replace fuse only with ratings: 1A range: F 1A /600V 630 (Quick Acting). 10A range: F 10A /600V 630 (Quick Acting) Never use the meter unless the back cover is closed completely. Do not use abrasives or solvents on the meter. To clean it use only a damp cloth and mild detergent.
5. GENERAL DESCRIPTION
This mini smart digital multimeter is designed to measure AC and DC voltage, AC and DC current, Resistance, Capacitance, Diode, Frequency, Non-contact voltage, Live line detect and audible continuity checks with accuracy and easy. Small and light weight device with test leads set, this instrument will provide you years of satisfactory service
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6. PANNEL AND LCD

1A model

10A model

No Current model

7. SPECIFICATION

Accuracy is specified for one year after calibration, at operating temperatures of 18 to 28, with relative humidity at 0% to 75%. Accuracy specifications take the form of: ±(% of Reading + Number of Least Significant Digits)

7.1 Voltage

Function
DC Voltage V

Range
4,000 V 40,00 V 400,0 V 600 V

Resolution
1 mV 10 mV 100 mV
1 V
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Accuracy ±(0.5% of rdg +3 digits)

AC Voltage1,2
V~

4,000 V
40,00 V 400,0 V

1 mV
10 mV 100 mV

600 V

1 V

1. Frequency Range: 40Hz~1kHz RMS. 2. AC minimum measurement: 5% of lowest range; 3. Overload Protection: 600V dc or 600V ac rms.

±(1.0% of rdg + 6 digits) ±(1.0% of rdg + 3digits)

7.2 Non-contact Voltage detect

Voltage

Frequency

Indication

50~1000V

50Hz~400Hz 4Bars display/ Alarm light/Beep

7.3 LIVE test

Voltage 100~1000V

Frequency

Indication

50Hz~400Hz “Hi” display/ Alarm light/Beep

7.4 Temperature Measurement (K-type thermocouple)

Range -200~1000 -328~1832

Resolution 1 1

Accuracy ±(2% of rdg +3 digits) ±(2% of rdg +6 digits)

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7.5 Current ((Depending Model))

Function

1A model

10A model

Resolution

Accuracy

DC Current mA
AC Current mA ~

40,00 mA 400,0 mA 1,000 A
/ 40,00 mA 400,0 mA
1,000 A

/ / 4000 mV 10,00 A / /
4000 mA

0,01 mA 0,1 mA 1 mA 1 mA 0,01 mA 0,1 mA
1 mA

±(1% of rdg+3 digits) ±(1.5% of rdg+3 digits) ±(1.5% of rdg+3 digits)

/

10,00 A

10 mA

Overload protection: 1A range: Maximum input 1A DC or AC RMS. F 1A/600V fuse. 10A range: Maximum input 10A DC or AC RMS. F 10A/600V fuse. Over Load indication: OL Displayed. >1A for 1min load on then 10min load off. Make sure A terminal socket have a good connect.

±(2% of rdg+3 digits)

7.6 Resistance

Function

Range 400,0

Resolution 0,1

4,000 k

1

Resistance

40,00 k 400,0 k

10 100

4,000 M

1 k

40,00 M

10 k

Overload protection: 600V dc or 600V ac rms.

Accuracy ±(0.5% of rdg+3 digits)
±(0.5% of rdg+2 digits)
±(1.5% of rdg+3 digits)

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7.7 Continuity Check

Function Continuity Test

Range 200

Resolution 0,1

Overload protection: 600V dc or 600V ac rms. Test Condition: Open circuit voltage: approx. 0.5V

7.8 Diode Test

Description Continuity beeper50

Function Diode test

Range 1V

Resolution 0,001 V

Overload protection: 600V dc or 600V ac rms. Test Condition: Forward DC current approximately 1mA. Reversed DC voltage approximately 1.5V

Accuracy 1.0% uncertainty

7.9 Capacitance (Depending model)

Function

Range

Resolution

Accuracy

4,000 nF

1 pF

±5.0% of rdg+30 digits]

40,00 nF

10 pF

Capacitance

400,0 nF 4,000F 40,00F

0,1 nF 1 nF 10 nF

±(3.0% of rdg+5 digits)

400,0F

0,1 uF

1,000 mF

1 uF

Overload protection: 600V dc or 600V ac rms. (Auto range only.)

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7.10 Linear Frequency
Range 10.00~40.00Hz

Resolution 0.01Hz

40.0~400.0Hz

0.1Hz

400~4000Hz

1Hz

Overload protection: 600V dc or 600V ac rms. Cannot accept below 10Hz and Over 1KHz.

Accuracy ±(0.5% of rdg+3 digits)

7.11 SCAN(SMART) measure mode range

Function

Range

DC Voltage

0.700V~600.0V

AC Voltage

0.700V~600.0V

Resistance

50.0~40.00M

Continuity

0.0~50.0

DC Current

1mA~10.00A

AC Current

4mA~10.00A

Please check Accuracy at Above function table

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8. GENERAL SPECIFICATIONS
Environment conditions: 600V CAT III MAX. Voltage between terminals and earth ground: 600V AC rms or 600V DC. Pollution degree: 2 Altitude < 2000m Operating temperature: 0~40 (32~122) Storage temperature: -10~60 (14~140) Fuse Protection: 1A range: F 1A /600V 630 (Quick Acting). 10A range: F 10A /600V 630 (Quick Acting). Sample Rate: 3 times/sec for digital data. Display: 3999 LCD display. Automatic indication of functions and symbols. SMART/SCAN function: Auto recognize measurement function (AC or DC Voltage/Resistor/Continuity/AC or DC Current). Range selection: automatic. Over Range indication: display ,,OL”. Low battery indication: Yes Polarity indication: ,,” displayed automatically. Hazardous voltage indication: >36V ,, ,, displayed. Current Mis-plug alarm: Alarm light/Beep. Auto Power off: 30 Minutes. Backlight and Alarm light and Flashlight: Yes Battery type: 3V, AAA*2. (3.7V 700mAh Li changeable battery with TYPEC USB is option) Dimensions: 130(L)63(W)35(H) mm. Weight: 110g. Approx. (battery included).
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9. OPERATING INSTRUCTION
9.1 SCAN (SMART) Measurement Mode 1. When LCD display SCAN symbol, unless use FUNC. Key change. 2. Connect the black and red test leads plug to the COM and V terminal. (When measure current, RED test lead Must plug-in mA/A terminal). 3. Connect the test leads probe to the target. 4. Device will according the target type to select measure function by self, target should be AC or DC Voltage/Resistor/Continuity/AC or DC Current.
9.2 Voltage Measurement 1. Use the FUNC. Key can select DCV or ACV measure mode. 2. Connect the black and red test leads plug to the COM and V terminal. 3. Connect the test leads probe to the target. 4. Read the displayed value. Red test lead connection will be positive when making a DCV measurement.
9.3 Current Measurement 1. Turn off power to the circuit. Discharge all high voltage capacitors. 2. Connect the black and red test leads to the COM and mA/A terminal. 3. Use the FUNC. Key can select DCA or ACA measure mode. 4. Break the circuit path to be tested. Touch the black probe to the more negative side of the break; touch the red probe to the more positive side of the break. (Reversing the leads will give a negative reading, but will not damage the Meter.) 6. Turn on power to the circuit; then read the display. 7. Turn off power to the circuit and discharge all high voltage capacitors. Remove the Meter and restore the circuit to normal operation. *At current function, red blacklight will interval flash for remind.
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9.4 Capacitance Measurement 1. Use the FUNC. Key can select Capacitance measure mode. 2. Connect the black and red test leads plug to the COM and V terminal. 3. Connect the test leads probe to the target. 4. Read the displayed value. Discharge all high voltage capacitors before measure. Do not input a Voltage source at this mode.
9.5 Resistance Measurement 1. Use the FUNC. Key can select Resistance measure mode. 2. Connect the black and red test leads plug to the COM and V terminal. 3. Connect the test leads probe to the target. 4. Read the displayed value. Do not input a Voltage source at this mode.
9.6 Frequency Measruement 1. Use the FUNC. Key can select Frequency measure mode. 2. Connect the black and red test leads plug to the COM and V terminal. 3. Connect the test leads probe to the target. 4. Read the displayed value.
9.7 Temperature Measurement 1. Use the FUNC. Key can select Temperature measure mode. 2. Connect the K-type thermocouple sensor to COM and V terminal and read the displayed value.
9.8 Diode Test 1. Use the FUNC. Key can select Diode measure mode. 2. Connect the black and red test leads plug to the COM and V terminal. 3. Connect the test leads probe to the target. Red test lead connection will be positive. 4. The meter will show the approx. forward voltage of the diode. Do not
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input a Voltage source at this mode.
9.9 Audible Continuity Test 1. Use the FUNC. Key can select Continuity measure mode. 2. Connect the black and red test leads plug to the COM and V terminal. 3. Connect the test leads probe to the target. 4. The meter will show the Resistance for connection. When the circuit is below 50, a continuous beeping will indicate it. Do not input a Voltage source at this mode.
9.10 LIVE Test (ONLY ONE RED TESTLEAD PLUGIN) 1. Hand hold the meter. Keep press the FUNC. Key 3second and then press once FUNC. Key to select LIVE test function. 2. Connect the red test lead plug to the V terminal. (Only need one RED test lead) 3. Connect the red test leads to the circuit being measured 4. “Hi” will been shown when connect the red test leads to LIVE wire.
9.11 Non-contact Voltage Detect (NCV/EF) Test 1. Keep press the FUNC. Key 3second to select NCV function. 2. Make upper right corner of device (marking NCV) close to test wire/ socket. 3. It will showing 4 bars according LIVE voltage level and distance.
10. KEY FUNCTION
10.1 Hold Key / Backlight Key Data Hold function: Press once (short press) Data Hold mode makes the meter stop updating the display. Backlight and flash light on/off: Keep press 3seconds (long press).
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10.2 FUNC Key / Range Key Function key: Press once (short press) Switches alternate function for: SCAN function, DCV, ACV, Resistance, Continuity, Diode, Capacitance, Frequency, Temperature. Into/Exit EF/LIVE test mode: Keep press 3seconds (long press).
11. AUTO POWER OFF FUNCTION
The Meter enters the ,,sleep mode” and blanks the display if the Meter is on but not used for 30 minutes. Keep press “HOLD” key then Press “ON/OFF” key to turn on meter, meter will disable auto power off function, auto power off symbol will be disappeared.
12. CURREN PLUG-IN DETECT
When test lead plug-in at mA/A terminal, then any measurement function will be changed to current measurement function.
13. DANGER VOLTAGE ALARM
Device getting a Hazardous voltage >36V, a thunder symbol ,, ” will be displayed.
14. BATTERY & FUSE REPLACEMENT
14.1 To replace the Meter’s battery: If the sign ,, ” appears on the LCD display, it indicates that the battery should be replaced. Remove the screw on the back cover and open the
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battery case. Replace the exhausted batteries with two new 1.5V batteries of the same type (AAA).

14.2 To replace the Meter’s fuse:
Fuse rarely need replacement and blow almost always as a result of operator’s error. Open the case and replace the blown fuse with the same rating specified: 1A Model: F 1A /600V 630. 10A Model: F 10A /600V 630.

15. WARNING!

Before attempting to open the case, always be sure that test leads have been disconnected from measurement circuits. Close case and tighten screws completely before using the meter to avoid electrical shock hazard.

16. ACCESSORIES

Battery Test Lead User manual Temperature sensor

1.5V (AAA) X 2pcs 1set 1 piece 1 piece

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