UT120B - Multimètre Uni-T - Notice d'utilisation et mode d'emploi gratuit

Type de produit	Multimètre numérique compact
Marque	Uni-T
Modèle	UT120B
Dimensions	125 x 70 x 30 mm
Poids	150 g environ
Alimentation	Pile 9V type 6LR61
Affichage	LCD numérique 3 1/2 digits
Plage de mesure tension AC	0 à 500 V
Plage de mesure tension DC	0 à 500 V
Plage de mesure courant DC	0 à 200 mA
Plage de mesure résistance	0 à 2 MΩ
Fonctions supplémentaires	Test de continuité, test de diode
Catégorie de sécurité	CAT II 500 V
Entretien et nettoyage	Nettoyer avec un chiffon sec et non abrasif
Sécurité d'utilisation	Respecter les catégories de mesure et ne pas dépasser les valeurs maximales
Pièces détachées et réparabilité	Non réparable par l'utilisateur ; confier à un professionnel
Informations générales	Idéal pour l'électronique de base et le bricolage

FOIRE AUX QUESTIONS - UT120B Uni-T

Comment mesurer une tension continue avec l'UT120B ?

Tournez le sélecteur sur la plage V DC (symbole V⎓), branchez les cordons (noir sur COM, rouge sur V/Ω/Diode), puis placez les pointes sur les points de mesure.

Quelle pile utilise l'UT120B et comment la remplacer ?

Il utilise une pile 9V type 6LR61. Ouvrez le compartiment à l'arrière de l'appareil, insérez la pile en respectant la polarité, puis refermez le couvercle.

Que faire si l'affichage reste allumé en continu ?

Vérifiez que le sélecteur est sur la position 'OFF'. Si le problème persiste, la pile est peut-être usée ou le circuit défectueux. Remplacez la pile ou contactez le service après-vente.

Comment tester la continuité d'un fil ?

Placez le sélecteur sur le symbole du haut-parleur (continuité). Branchez les cordons et touchez les deux extrémités du fil. Si la continuité est bonne, l'appareil émet un bip sonore.

Quelle est la précision de l'UT120B ?

La précision est de l'ordre de ±1% pour les tensions continues et de ±2% pour les tensions alternatives, selon les spécifications du fabricant.

Puis-je mesurer des tensions supérieures à 500 V ?

Non, l'UT120B est limité à 500 V max. Pour des tensions supérieures, utilisez un appareil adapté. Le dépassement peut endommager l'appareil et présenter un risque de sécurité.

Comment utiliser la fonction test de diode ?

Tournez le sélecteur sur le symbole diode. Branchez la sonde rouge sur l'anode et la noire sur la cathode. L'affichage indique la tension de seuil. Pour une diode polarisée en inverse, l'affichage indique 'OL'.

Les cordons de mesure sont-ils remplaçables ?

Oui, les cordons de mesure sont amovibles. Utilisez des cordons de remplacement de même spécification (CAT II 500 V). Débranchez toujours l'appareil avant de remplacer les cordons.

Que signifie 'OL' sur l'affichage ?

'OL' signifie 'Over Load' (surcharge). Cela indique que la valeur mesurée dépasse la plage sélectionnée. Passez à une plage plus élevée.

Comment nettoyer l'UT120B ?

Utilisez un chiffon sec ou légèrement humide (eau savonneuse) pour nettoyer le boîtier. N'utilisez pas de solvants ni de produits abrasifs. Ne plongez jamais l'appareil dans l'eau.

MODE D'EMPLOI UT120B Uni-T

UNI-T®

UT120A/B

Operating Manual

Pocket Size Type Digital Multimeters

I. Introduction

UT120A/B is a 4000-count notebook type auto-ranging digital multimeter with following advantages complete functions, stable performance, high accuracy, low power consumption, novel structure, high degree of safety and reliability. It is capable of measuring AC/DC voltage, frequency, duty cycle, resistance, capacitance, diode and continuity, and becomes an ideal choice for measurement.

The Manual specifies safety information and notes relating to the meter, please read the manual carefully before use and strictly follow all warnings and notes during the operation.

⚠ Warning: Please read "Safety Information" before operating the meter.

II. Safety Information

UT120A/B digital meter is designed and manufactured in accordance with safety standard IEC61010, Double Insulation and Overvoltage CATII 600V as well as Pollution Degree 2.

Pay attention to warning symbol △ and its corresponding contents. Warning items state situations or actions that may cause potential risks to users or damage to the meter or measured equipments.

Operate the meter as specified in the manual; otherwise the protection offered by the meter will be impaired or lost.

1. Please ensure test pen's insulation layer is good and no insulation damage or broken wires before use. If test pen lead or meter housing is found with any obvious damage or failure to operate normally, do not use the meter

2. Keep your fingers behind the protection ring when using the test pen.

3. To avoid electric shock or damage to the meter do not apply voltage above 600V between meter terminals and the grounding
4. Be careful when working voltage is above DC60V and AC 42VRMS so as to prevent electric shock.

5. The meter is prohibited to use when back cover is not well placed, otherwise it may cause electric hazard

6. Do not exceed the specified limit value in order to avoid shock hazard or meter damage.

7. In case of damage to meter, no gear changes of function switch are allowed during measurement.
8. Do not change internal wiring without authorized permission which may endanger the meter or users.
9. To ensure accurate readings, please change batteries timely if “ ” icon appears on LCD.
10. Do not use the meter in environment with high temperature and humidity, especially the meter placed in humid places may be degraded after being moisture-affected.
11. Clean the meter housing with soft wet cloth and mild detergent. No abrasive or dissolvent is allowed for cleaning.

International Electrical Symbols

	Low Battery Display	±	Grounding	⚠ Warning
~	AC	→	DC	■ Double Insulation
●	Buzzer Continuity	→	Diode	+/- Capacitance
CE	Conformity with Europe Union standards

III. Meter Description(See Figure 1)

1. LCD Display

1. SELECT Button to toggle between Resistance, Capacitance, Diode and Continuity functions.(Capacitance for UT120B only).
2. Relative Value Measurement (REL Button)
3. Function Selection Switch Knob
4. Hz/% Measurement (DCV, ACV
   and Hz/% functions)
5. Data Hold (Hold Button);
6. Positive Input End (Red Test Pen);
7. Negative Input End (Black Test Pen);

IV.Button Functional Description

1. SELECT Button

It is used for switchover among resistance, capacitance, and buzzer continuity and diode measurements, indicated by beeping during the operation.

Pressing this button can wake up the meter from standby mode, which, however, will the auto power off function.

1. REL Button (Relative Value Measurement)

With this button pressed down, current reading is set as reference value which will be subtracted from subsequent measurement readings. Press again to exit this mode and return to normal measuring status. This function is not available under frequency and duty cycle measurement.

3. Data Hold (HOLD Button):

Press this button to lock displayed values and hold the value; press it again to unlock this status and return to normal measuring mode.

4. Hz/% Measurement:

Switch to Hz or % measurement by pressing the button if under DCV and ACV ranges (the Hz/% key also used for frequency and duty cycle selection); where Hz/% measurement is finished, the meter will return to DCV or ACV status with the range default at 400mV(DCV) or 4V(ACV) and meanwhile® AUTO™ icon on LCD disappears. If high voltage is under test at the moment set functional knob switch or turn the meter off to reset auto-ranging for V before starting the test.

Under Hz/% mode, press the button to switch between Hz and % measurement.

V. Making Measurements

Switch on the meter to check if on the LCD there is 📋 icon which indicates the power supply falls low. To ensure high accuracy for measurement, please replace batteries. You should also take notice of notes beside the △, which indicate not to exceed the indicated value when testing voltage.

1. Measuring DC Voltage(See Figure 2)

(1) Set knob to DCV, AUTO and DC icon appear on LCD:
(2) Connect the black test pen to the cathode of the power being measured and the red test pen to the anode of the power being measured;
(3) Read measuring results displayed on LCD;
(4) Reverse test pens, then LCD will display negative readings.

Figure 2

Figure 3

2. Measuring AC Voltage(See Figure 3)

(1) Set knob to ACV, AUTO and AC icon appear on LCD;

(2) Connect the black test pen to the cathode of the power being measured and the red test pen to the anode of the power being measured;

(3) Read measuring values indicated on LCD;

(4) LCD will indicate negative readings if reversing test pen connection,

⚠️ Warnings:

- Do not input voltage above 600V, you may get desired values, however, which causes hazard to internal wiring.

● To avoid electric shock, please use it with extreme caution when

measuring high voltages.

- Disconnect test pens with measured circuits after finished all operations.

3. Measuring Resistance(See Figure 4)

(1) Set knob to Ω → ·· position
(2) Connect test pens to the resistance being measured;
(3) Read measured results on the display.

Notes:

• Please ensure to power off and discharge all capacitor before measuring online resistance so as to avoid meter damage.
• As for resistance measurement under 400Ω gear, test pen leads will cause error 0.1Ω 0.3Ω to readings In order to get accurate readings the ultimate results should subtract the short circuit reading values of the red and black test pens. It is suggested performing the operation under relative value measurement mode.

The Ground Truth image displays a single, solid horizontal line. According to Rule 2 (UNDERSCORE & LINE RULES), this is a stylistic or background line, not a placeholder underscore. Therefore, the OCR result must ignore it and output nothing or only meaningful text. The provided OCR content is "____", which consists of four underscores. This is an incorrect interpretation of the line as a placeholder, violating the rule that stylistic lines must be ignored. The OCR has hallucinated placeholder underscores where none should exist in the GT. Hence, the OCR result is inconsistent with the Ground Truth.

Figure 4

P/N: 110401105302X MAY.2018 REV. 1

UNI-T®

• The meter should display "OL" if no signal is input, for instance, open circuit.
• For measurement 1MΩ , it normally takes several seconds to get stable readings.

4. Measuring Frequency and Duty Cycle(See Figure 5)

(1) Set knob switch to Hz/% or DCV or ACV position;

(2) Press Hz/% button to access frequency measurement;

(3) Connect test pens to frequency signal

source being m asured;

(4) Read results on LCD;

(5) Press Hz/% button again to

access % measurement

Note:

• The measured resolution based on frequency and waveform will vary slightly and have been preset with reference to sine wave.

5. Testing Diodes and Continuity(See Dotted Part in Figure 6)

(1) Set knob switch to Ω *• position:

(2) Press SELECT button to access diode mode

(press it again for continuity testing):

(3) Connect test pen leads to measured diode (with black test pen to cathode and red test pen to anode), then LCD reading will be a approximate value of diode forward voltage drop (when connecting test pens to both ends of the circuit being measured, if resistance between these two ends is 60Ω , the built-in buzzer will beep and the resistance value appears on LCD).

Figure 6

Notes:

- If measured diode is under open circuit status or with polarity reversed (namely, with black test pen connecting to anode and red test pen to cathode), LCD will display "OL".

- This function can be used to measure the voltage drop of PN joint of diode or semiconductor. For a normal silicon semiconductor, the reading of forward voltage drop should be within 0.5\~0.8V.

- To prevent meter damage, power off all circuits and discharge all capacitors completely before measuring online diode

- In order to prevent meter damage or personal injury, do not input voltages above DC60V or AC 30VRMS.

6. Measuring Capacitance(See Figure 7)

(1) Set knob switch to +k position
(2) As there is a capacitance reading displayed under open-circuit status, please select relative value measurement mode:
(3) Press REL button one time:
(4) Connect test pens to the capacitance being measured, then read the data on LCD.

Notes:

- Discharge all capacitors completely before testing.

- As for in-line capacitance measurement, it is required to power off all measured circuits and discharge completely all capacitors. If the capacitance being measured has polarity, ensure that the red pen is connected to the

anode of capacitance and black one to the cathode of capacitance.

• It normally takes several seconds to display the testing value when measuring more than capacitance over10uF.

- To avoid meter damage or personal injury, do not apply voltages above DC60V or AC 30VRMS.

VI. Technical Specifications

A. General Specifications

1. Max. Voltage between the Voltage Input Terminal and Grounding: 600VRMS or 600DCV

2. Range Selection: Auto

3. Measuring Velocity: 3 times per second
4. Max. Display: 3999
5. Over Range Display: "OI"
6. Polar Indication: “-” icon for negative input
7. Low Battery Display: " ” on LCD
8. Low Battery Display. ☑ on LCD
9. Internal Battery: one Lithium manganese button cell, 2V, model: CP2032
10. Internal Battery: one Lithium-manganese button cell, 3V, model: CR2032
11. Operating Temperature: 0 C\~40 C (32 F\~104 F); Humidity: 675%

Humidity≤75%

Storage Temperature: -10°C\~50°C (14°F\~122°F)

Operating Altitude Height: ≤2000m

1. Dimensions: 109.8mm x 8.2mm x10.8mm

2. Weight: about 76 g (test pens and battery included)

12 Auto Power Off

The meter enters the standby mode after 30 minutes of inactivity of rotary switch and buttons. It can automatically power on (i.e. enter the working mode) if sliding rotary switch or any pressing button on the front panel. This function will be canceled if pressing SELECT button to wake up the meter "button to wake up the meter".

B. Accuracy Specifications

Accuracy:

Ambient T ± (a% readings+ b digits), calibration per year.

Relative H emperature: 23°C + 5°C:

umidity:≤75%

Functions	Range	Resolution	Accuracy ± (a% readings+ b digits)	InputProtection	Description
DCVoltage	4V	1mV	± (0.8%+1)	600V DC600 V AC	Input Impedance 10M Ω;
	40V	10mV
	400V	100mV
	600V	1V	± (1%+3)
AC Voltage	4V	1mV	± (1.2%+3)	600V DC600 V AC	Input Impedance 10M Ω; FrequencyResponse: 40~400HzDisplay: RMS of Sinewave(Mean ValueResponse)
	40V	10mV
	400V	100mV
	600V	1V	± (1.5%+5)
Resistance	400 Ω	0.1 Ω	± (1.2%+2)	600 V AC	Open circuitvoltage is about0.45V.
	4K Ω	1 Ω	± (1%+2)
	40K Ω	10 Ω
	400K Ω	100 Ω
	4M Ω	1K Ω	± (1.2%+2)
	40M Ω	10K Ω	± (1.5%+2)

Functions	Range	Resolution	Accuracy ± (a% readings + b digits)	Input Protection	Description
Capacitance	4.000nF	0.001nF		600 V AC	For reference
	40.00nF	0.01nF	± (4%+3)		Measured under relative measurement, 0.45V for open circuit
	400.0nF	0.1nF
	4.000μF	0.001μF
	40.00μF	0.01μF			Just for reading reference when measured capacitance above “100 μF”.
	100 μF	0.1μF	± (5%+10)
Frequency	99.9Hz	0.1Hz	± (0.5%+3)	600 V AC	Input sine wave 10Hz~10kHz: 1V RMS10kHz~100kHz: 30VRMS
	0.999kHz	0.001kHz
	9.99kHz	0.01kHz
	99.9kHz	0.1kHz
Duty Cycle	0.1%~99.9%	0.10%		600 V AC	Use DUTY knob switch to shift to DUTY measurement node when under AC/DC function (reading for reference only)
Diode	→	1mV	0.5V~0.8v	600V AC	1.5 V for open circuit status
Buzzer Continuity	●●●	0.1Ω	About 60 Ω	600V AC	Continuity Resistance 60 Ω : buzzer beeps; >60 Ω : not necessarily to beep, resistance approximate value is displayed, unit is Ω
Low Voltage Indication			About <2.4V		icon appears

VII. Battery Replacement (See Figure 8)

If 📄 icon appears on LCD, please replace

battery as follows:

1. Disconnect test pens with circuits being
   measured, set knob switch to OFF position then power off the meter.

2. Unscrew the back housing and remove

the rear housing.

1. Replace the battery with a new 3V battery.

conforms to UL STD 61010-1, 61010-2-030, 61010-031,

Intertek 4007682 certified to CSA STD C22.2 NO.61010-1, 61010-2-030, 61010-031

Figure 8

UNI-T

UNI-TREND TECHNOLOGY (CHINA) CO., LTD.

No6, Gong Ye Bei 1st Road,

Songshan Lake National High-Tech Industrial

Development Zone, Dongguan City.

Guangdong Province, Chin

Tel: [phone]

http://www.uni-trend.com