UNI-T Digital Multimeter Handheld Instruction Manual

UNI-T Digital Multimeter Handheld

Product Information

The Digital Multimeter is a versatile device designed for electrical measurements. It adheres to the IEC61010 safety standard issued by the International Electrotechnical Commission or equivalent standard GB4793.1. The device features an LCD display with a maximum display of 1999 (3 1/2) digits and an automatic polarity display. It operates using A/D conversion and has a sampling rate of approximately 3 times per second. The device also includes safety symbols and indicators for high voltage, ground connection, dual insulation, manual reference, and low battery.

Product Usage Instructions

1. Unpack the device and inspect the contents of the package to ensure all parts and accessories are present.
2. Verify that the following items are included in the package:
   • User’s manual – 1 piece
   • Test leads – 1 pair
   • Battery (1.5V AAA) – 2 pieces
3. Before using the device, read and familiarize yourself with the safety operation rules provided in the user manual.
4. Ensure that input over the range is avoided during testing in each range.
5. Take note that voltages below 36V are considered safe.
6. When working with charged conductors, use appropriate personal protective equipment (PPE) such as insulated gloves, goggles, etc., to prevent injury from electric shock or arc.
7. Always measure according to the correct standard measurement category (CAT), using the specified voltage probe, testing wire, and adaptor.
8. Refer to the user manual for any specific safety symbols or indicators displayed on the device.
9. Monitor the low battery indicator and replace the batteries when necessary.
10. The device can operate in a working environment with a temperature range of 0°C to 40°C and relative humidity within the specified limits.

SUMMARY

• It is an intelligent multi-purpose meter that can automatically identify functions and ranges according to the input measurement signals, making the operation simpler, more convenient and faster. The product is designed to meet the requirements of safety regulations CAT III 600V, with full functional design overload protection, safe and reliable operation, and innovative patent appearance design and functional configuration logo.
• It can be used to measure DCV, ACV, DCA, ACA, resistance and continuity test, NCV (non-contact ACV induction measurement), Live (live line judgment) and torch functions.
• It is the ideal entry level tools of electronic hobbyists andhome users.

UNPACKING INSPECTION

Open the package to check if all parts and accessories are all right in the box

1. User’s manual 1pc
2. Test leads 1pair
3. Battery (1.5V AAA) 2pc

SAFETY OPERATION RULE

This series of devices is designed according to the IEC61010 standard (safety standard issued by International Electrotechnical Commission or equivalent standard GB4793.1). Please read these safety notices before using it.

1. Input over the range is prohibited in each range during the test.
2. A voltage that is less than 36V is a safety voltage. When measuring voltage higher than DC 36V, or AC 25V, check the connection and insulation of test leads to avoid electric shock. When the input ACV/DCV is more than 24V, the high voltage warning symbol “ “will be displayed.
3. When changing function and range, test leads should be removed away from the testing point.
4. Select correct function and range, beware of the wrong operation. Please still be careful although the meter got a function of full range protection.
5. Do not operate the meter if the battery and back cover is not fixed.
6. Do not input voltage when measuring capacitance, diode or doing the continuity test.
7. Remove test leads from test point and turn off the power before replacing battery and fuse.
8. Please comply with local and national safety regulations. Wear personal protective equipment (such as approved rubber gloves, face masks, and flame-retardant clothing etc.) to prevent the injury from electric shock and arc when charged conductors are exposed.
9. Please measure according to the correct standard measurement category (CAT), voltage probe, testing wire and adaptor.
10. Safety symbols “ ” exists high voltage， dual insulation，“ ” must refer to manual，“ ” low battery

SAFETY SYMBOLS

CHARACTERISTIC

1. Display method: LCD displaying;
2. Max display: 1999 (3 1/2) digits automatic polarity display;
3. Measurement method: A/D conversion;
4. Sampling rate: about 3 times/seconds
5. Over-range display: the highest digit displays “OL”
6. Low voltage display： “ ”appears;
7. Working environment: (0～40)℃, relative humidity: <75%;
8. Storage environment: (-20～60)℃, relative humidity < 85% RH;
9. Power supply: Two batteries 1.5V AAA
10. Dimension: (146 72 50) mm (lengthwidthheight);
11. Weight: about 210g (including battery);

EXTERNAL STRUCTURE

1. Sound alarm indicator light
2. LCD display
3. Turn on/off key/ live line judgment and auto range conversion
4. Measurement input terminal
5. Function selection
6. NCV measurement/Turn on/off torch
7. Data hold / turn on/off the backlight
8. NCV sensing position
9. Bracket
10. Screws for fixing the battery box
11. Bracket for fixing the test leads

LCD DISPLAY

KEY DESCRIPTION

1. POWER KEY
   Long press this key (＞2 seconds) to turn on/off the power, short press it to switch auto range/fire line judgment

2. FUNC KEY

   • Short press this key to cycle switch DCV/ACV 、 resistance、continuity and auto range test function
   • Short press this key to switch ACA、DCA when the current measurement function(insert the red test lead to the “mA/A” jack.

3. NCV/
   Short press this key to turn on/off NCV function measurement, and long press (＞2 seconds)to turn on/off the torch.

4. HOLD B/L
   Short press this key to turn on/off date hold function, “ ” will display on the screen when it’s turned on. Long press it (＞2 seconds) to turn on/off the backlight (the backlight will turn off after 15 seconds)

Warning: to prevent possible electric shock, fire or personal injury, do not use the data hold function to measure the unknown voltage. When opening the HOLD function, the LCD will keep original data when measuring a different voltage.

MEASUREMENT INSTRUCTIONS

First of all, please check the battery, and turn the knob to the proper range that you need. If the battery is out of power, the ” ” symbol will appear on the LCD. Pay attention to the symbol next to the jack for test leads. This is a warning that the voltage and current should not exceed the indicated value. AUTO auto mode can measure resistance、continuity、DCV、 ACV、DCA 、ACA functions. FUNC manual mode can measure DCV 、ACV 、 continuity/resistance function.

DCV and ACV measurement

• Under auto / manual mode switch to DCV/ACV range, and connect the test leads across to the tested circuit, The voltage and polarity from the red test lead are displayed on the screen.
• Insert the black test lead to the “COM” jack, and the red one to “ ” jack.
• You can get the result from the display.

Note:

1. The LCD will display an “OL” symbol if it is out of the range.
2. When measuring high voltage (above 220V), it’s necessary to wear personal protective equipment (such as approved rubber gloves, face masks, and flame-retardant clothing etc.) to prevent injury from electric shock and arc.

DCA and ACA measurement

1. Insert the red test lead to the “mA/A” jack， auto identification DCA function.
2. Short press the “FUNC” key to switch DCA/ACA function.
3. Insert the black test lead to the “COM” jack, the red one to the “mA/A” jack, and then connect the test leads to the power or circuit under test in series.
4. Read the result on the LCD.

Note:

1. Before connecting the test leads to the power or circuit, you should turn off the power of the circuit first, and then check the input terminal and function range is normal. Don’t measure voltage with the current jack.
2. The max measure current is 10A, it alarms when the measuring range is exceeded. Overload input or wrong operation will blow the fuse.
3. When measuring a large current (more than 5A), the continuous measurement will make the circuit heat, affect the measurement accuracy and even damage the instrument. It should be measured each time less than 10 seconds. The interval recovery time is more than 10 minutes.

Resistance measurement

1. At the auto mode, connect the two test leads to the resistor under the test.
2. Insert the black test lead to the “COM” jack, and the red one to “ ” jack.
3. You can get the result from the display.

Note:

1. At the manual mode, the LCD displays “OL” while the resistance is over range. When the measuring resistance is over 1MΩ, the meter may take a few seconds to stabilize. This is normal for testing high resistance.
2. When measuring online resistance, be sure the circuit under-tested has been switched off and all capacitors are fully discharged.

Continuity test

1. At the auto/manual mode convert to continuity test function.
2. Insert the black test lead to “COM” jack, the red one to “ ” jack.
3. Connect the test leads to two points of the tested circuit, if the resistance value between the two points is lower than about 50Ω, the LCD will display “ ” and the built-in buzzer sounds.

Live line recognition

1. Short press “POWER/Live” key, convert to Live function.
2. Insert the red test lead to “ ” jack, and contact the measured point with the red test lead
3. If there is a sound and light alarm, the measured line connected by the red test lead is live line. If nothing changes, the measured line connected by the red test lead isn’t live line.

Note:

1. The range must be operated according to safety rules.
2. The function only detects AC standard mains power lines (AC 110V~AC 380V).
   • NCV (non-contact ACV induction measurement)
   • Short press “ ” key, convert to NCV function.
   • NCV induction voltage range is 48V~250V, the upper position of the meter close to the measured charged electric field (AC power line, socket, etc), the LCD display “ 一 ”or “ — ”, the buzzer sounds, at the same time the red indicator flashing; As the intensity of the sensed electric field increases, the more horizontal line “—-”displayed on the LCD, the faster the buzzer sounds and the more often the red light blinks.

Note: When the measured electric field voltage is ≥AC100V, pay attention that whether the conductor of the measured electric field is insulated, in order to avoid electric shock.

Auto power off function
In order to save the battery energy, APO auto power off function already set by default when you turn on the meter, if you have no any operation in 14 minutes, the meter will beep for three times to hint, if there’s still no any operation, the meter will long sound and auto power off after one minute.

TECHNICAL FEATURES

Accuracy: ±(a%×rdg＋d), ensuring the accuracy environment temperature: (23±5)℃, relative humidity <75%

DCV

Range| Accuracy| Resolution| Input

impedance

| Overload

protection

---|---|---|---|---
2V| ****

±(0.5%+3)

| 0.001V| ****

≥300kΩ

| 600V DV/AC RMS
20V| 0.01V
200V| 0.1V
600V| ±(1.0%+10)| 1V

Min identification voltage: above 0.6V
ACV

Range| Accuracy| Resolution| Input

impedance

| Overload

protection

---|---|---|---|---
2V| ±(1%+5)| 0.001V| ****

≥300kΩ

| 600V DV/AC RMS
20V| ±(0.8%+5)| 0.01V
200V| 0.1V
600V| ±(1.2%+10)| 1V

Min identification voltage: above 0.6V
Measuring range of accuracy: 10% – 100% of the range;
Frequency response: 40Hz – 400Hz Measuring way (sine wave) True RMS
Crest factor: CF≤3, when CF≥2, add an additional error of 1% of the reading

DCA

Fuse 10A/250V

6A| ±(1.5%+10)| 0.001A
10A| ±(2.0%+5)| 0.01A

Min identification current: above 1mA
Measuring range of accuracy: 5% – 100% of the range
Max. Input current: 10A (less than 10 seconds);
Interval time: 15 minutes

ACA

Fuse 10A/250V

6A| ±(2.0%+5)| 0.001A
10A| ±(3.0%+10)| 0.01A

Min identification current: above 2mA
Measuring range of accuracy: 5% – 100% of the range
Frequency response: 40Hz – 400Hz Measuring way (sine wave) True RMS
Crest factor : CF≤3, when CF≥2, add an additional error of 1% of the reading
Max. Input current: 10A (less than 10 seconds);
Interval time: 15 minutes

Resistance (Ω)

600V DV/AC RMS

20kΩ| ±(0.8%+3)| 0.01kΩ
200kΩ| 0.1kΩ
2MΩ| ±(1.5%+3)| 0.001MΩ
20MΩ| ±(2.0%+10)| 0.01MΩ

Measuring error does not include lead resistance
Measuring range of accuracy: 1% – 100% of the range
Continuity test

200 /

2000Ω

| the buzzer makes a long

sound,

| ****

600V DV/AC RMS

| open-circuit voltage: ≤ 2V|

Resolution: 1Ω

BATTERIES AND FUSE REPLACEMENT

1. Move away the test leads from the circuit under test, pull out the test lead from the input jack, turn the range knob to the “OFF” range to turn off the power.
2. Use a screwdriver to twist off the screws on the battery cover, and remove the battery cover and bracket.
3. Take out the old battery or the broken fuse, then replace with a new alkaline battery 9V or a new fuse.
4. Close the battery cover and use a screwdriver to tighten the screws on the battery cover.
5. Battery specifications: 2 * 1.5V AAA
6. Fuse specifications: 10A input fuse: ϕ5 * 20mm 10A250V

Note: When the low voltage ” ” symbol displays on the LCD, the battery should be replaced immediately, otherwise the measuring accuracy will be affected.

MAINTENANCE AND CARE

It is an accurate meter. Do not try to modify the electric circuit.

1. Pay attention to the waterproof, dustproof, and break proof of the meter;
2. Please do not store or use it in an environment of high temperature, high humidity, high flammability, or strong magnetic.
3. Please wipe the meter with a damp cloth and soft detergent, and abrasive and drastic solvents such as alcohol are forbidden.
4. If do not operate for a long time, should take out the battery to avoid leakage.
5. When replacing a fuse, please use the same type and specification fuse.

Troubleshooting

If the meter cannot work normally, the methods below may help you to solve general problems. If these methods do not work, please contact a service center or dealer.

●Set the HOLD key to a correct mode

● Replace  battery

appears| ● Replace battery
No current input| ● Replace fuse
Big error value| ● Replace battery
LCD displays dark| ● Replace battery

The specifications are subject to change without notice. The content of this manual is regarded as correct, error or omits Pls. contact with factory. We hereby will not be responsible for the accident and damage caused by improper operation. The function stated for this User Manual cannot be the reason of special usage.

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