1. Introducció
This manual provides detailed instructions for the safe and effective operation of the UNI-T UT33C Digital Handheld Multimeter. The UT33C is a compact, battery-powered device designed for measuring DC/AC voltage, DC current, resistance, diode, continuity, and temperature. Please read this manual thoroughly before use to ensure proper functionality and safety.
2. Informació de seguretat
WARNING: To avoid electric shock or personal injury, read and understand all safety information before using this multimeter.
- Assegureu-vos sempre que els cables de prova estiguin inserits correctament als endolls d'entrada adequats per a la mesura que s'està realitzant.
- Do not exceed the maximum input values specified for each range. Refer to the specifications section.
- Never use the multimeter if it appears damaged or if the test leads are damaged.
- Do not operate the multimeter in explosive gas, vapor, or dusty environments.
- Desconnecteu sempre l'alimentació del circuit i descarregueu totes les emissions d'alt volum.tage condensadors abans de provar la resistència, la continuïtat o els díodes.
- Replace the battery immediately when the low battery indicator appears on the display.
- Assegureu-vos que la tapa de la bateria estigui ben tancada abans de fer-la funcionar.
- Complir els codis de seguretat locals i nacionals.
3. Característiques del producte
- Palm-size design for easy portability.
- Mesures DC/AC Voltage, DC Current, Resistance.
- Diode and Continuity test functions.
- Temperature measurement in Celsius and Fahrenheit.
- Data Hold function for convenient reading.
- Retroiluminació per a una visualització nítida en condicions de poca llum.
- Indicació de bateria baixa.
4. Producte acabatview i Components
The UNI-T UT33C multimeter features a clear digital display, a central rotary switch for function selection, and input jacks for test leads. Below is an illustration and description of its main components.
Figura 1: Davant view of the UNI-T UT33C Digital Multimeter. This image displays the red casing, LCD screen showing '00.0', 'HOLD' button, backlight button, central rotary switch with various measurement functions (voltage, current, resistance, temperature, diode, continuity), and three input jacks at the bottom for test leads.
Components clau:
- Pantalla LCD: Mostra lectures de mesura, unitats i indicadors de funció.
- Botó HOLD: Congela la lectura actual a la pantalla.
- Backlight Button (Snowflake/Light Symbol): Activa o desactiva la retroiluminació de la pantalla.
- Interruptor rotatiu: Used to select the desired measurement function and range.
- Entrada de 10A: For DC current measurements up to 10A.
- VΩmACF Input Jack: Per al voltage, resistance, milliampere current, capacitance, and frequency measurements. This is the positive (+) input.
- Presa d'entrada COM: Common (negative -) input for all measurements.
5. Configuració
5.1 Instal·lació de la bateria
- Assegureu-vos que el multímetre estigui APAGAT.
- Localitzeu el compartiment de la bateria a la part posterior de la unitat.
- Feu servir un tornavís per treure el cargol que fixa la tapa de la bateria.
- Traieu la coberta amb cura.
- Introduïu una pila nova de 9 V, respectant la polaritat correcta (+ i -).
- Substituïu la tapa de la bateria i fixeu-la amb el cargol.
5.2 Connexió del cable de prova
- Per a la majoria de mesures (voltage, resistance, diode, continuity, temperature, and current up to 200mA), connect the black test lead to the COM jack i el cable de prova vermell al VΩmACF jack.
- For DC current measurements between 200mA and 10A, connect the black test lead to the COM jack i el cable de prova vermell al 10A jack.
6. Instruccions de funcionament
Always select the appropriate function and range using the rotary switch before connecting the test leads to the circuit under test.
6.1 Mesurar DC Voltage (V=)
- Connect the test leads as described in Section 5.2 (COM and VΩmACF).
- Ajusteu l'interruptor rotatiu al volum de CC desitjattage (V=) range (e.g., 200m, 2000m, 20, 200, 500). If the voltage is unknown, start with the highest range (500V) and decrease as necessary.
- Connecteu els cables de prova al component o circuit que s'ha de mesurar, observant la polaritat.
- Llegeix el voltage valor a la pantalla LCD.
6.2 Mesurar AC Voltage (V~)
- Connect the test leads as described in Section 5.2 (COM and VΩmACF).
- Ajusteu l'interruptor rotatiu al volum de CA desitjattage (V~) range (e.g., 200, 500). If the voltage is unknown, start with the highest range (500V) and decrease as necessary.
- Connect the test leads across the component or circuit to be measured. Polarity is not critical for AC voltage.
- Llegeix el voltage valor a la pantalla LCD.
6.3 Measuring DC Current (A=)
- For 200mA or less: Connect the black test lead to COM and the red test lead to VΩmACF.
- For 10A: Connect the black test lead to COM and the red test lead to 10A.
- Set the rotary switch to the desired DC Current (A=) range (e.g., 20m, 200m, 10A). Start with the highest range if the current is unknown.
- Open the circuit where current is to be measured and connect the multimeter in series with the load.
- Llegiu el valor actual a la pantalla LCD.
6.4 Mesura de la resistència (Ω)
- Assegureu-vos que el circuit estigui desenergitzat i que tots els condensadors estiguin descarregats.
- Connect the test leads as described in Section 5.2 (COM and VΩmACF).
- Set the rotary switch to the desired Resistance (Ω) range (e.g., 200, 2000, 20k, 200k, 20M). Start with a higher range if the resistance is unknown.
- Connecteu els cables de prova al component que s'ha de mesurar.
- Llegiu el valor de la resistència a la pantalla LCD.
6.5 Prova de díodes
- Assegureu-vos que el circuit estigui desenergitzat.
- Connect the test leads as described in Section 5.2 (COM and VΩmACF).
- Ajusteu l'interruptor rotatiu al símbol del díode.
- Connect the red test lead to the anode and the black test lead to the cathode of the diode. A forward voltage drop (typically 0.5V to 0.8V for silicon diodes) will be displayed.
- Inverteix els cables de prova. La pantalla hauria de mostrar "OL" (bucle obert) per a un díode en bon estat.
6.6 Prova de continuïtat
- Assegureu-vos que el circuit estigui desenergitzat.
- Connect the test leads as described in Section 5.2 (COM and VΩmACF).
- Set the rotary switch to the Continuity (buzzer) symbol.
- Connect the test leads across the component or circuit path.
- If the resistance is below approximately 50Ω, the buzzer will sound, indicating continuity. The display will also show the resistance value.
6.7 Mesura de temperatura (°C/°F)
- Connect the temperature probe (K-type thermocouple, not included with all models) to the VΩmACF (positive) and COM (negative) jacks, observing polarity.
- Set the rotary switch to the °C or °F position.
- Place the tip of the temperature probe on or near the object whose temperature is to be measured.
- Llegiu el valor de la temperatura a la pantalla LCD.
6.8 Funció de retenció de dades
Premeu el botó MANTENIM per congelar la lectura actual a la pantalla. Premeu-lo de nou per alliberar la funció de retenció i reprendre les mesures en directe.
6.9 Funció de retroiluminació
Premeu el botó Snowflake/Light button to turn on the display backlight. Press it again to turn off the backlight. This feature is useful in dimly lit environments.
7. Manteniment
7.1 Substitució de la bateria
When the low battery indicator appears on the display, replace the 9V battery as soon as possible to ensure accurate measurements. Follow the steps outlined in Section 5.1.
7.2 Canvi de fusibles
The 10A input jack is protected by a fuse. If the multimeter fails to measure current in the 10A range, the fuse may need replacement. Refer to the specifications for the correct fuse type. Fuse replacement should only be performed by qualified personnel.
- Assegureu-vos que el multímetre estigui apagat i que els cables de prova estiguin desconnectats.
- Traieu la tapa de la bateria i la bateria.
- Unscrew the case screws and carefully open the multimeter casing.
- Locate the fuse(s) and replace the blown fuse with one of the identical type and rating.
- Carefully reassemble the casing, ensuring all screws are tightened.
7.3 Neteja
Netegeu el cas amb l'anunciamp drap i detergent suau. No utilitzeu abrasius ni dissolvents. Assegureu-vos que el multímetre estigui completament sec abans d'utilitzar-lo.
8. Solució De Problemes
| Problema | Causa possible | Solució |
|---|---|---|
| Sense pantalla o pantalla tènue | Bateria baixa o sense bateria. | Substituïu la bateria de 9V. |
| 'OL' (Overload) displayed | Input value exceeds selected range. | Select a higher range or check if the circuit is open. |
| Lectures incorrectes | Incorrect function/range selected, poor test lead connection, or damaged test leads. | Verify function/range, ensure secure connections, inspect/replace test leads. |
| No current measurement (10A range) | Fusible cremat. | Replace the fuse (refer to Section 7.2). |
9. Especificacions
| Paràmetre | Valor |
|---|---|
| Fabricant | UNI-T |
| Número de model | UT33C |
| Tipus de mesura | Multímetre |
| DC Voltage Gammes | 200mV, 2000mV, 20V, 200V, 500V |
| Vol. ACtage Gammes | 200 V, 500 V |
| Rangs de corrent continu | 20 mA, 200 mA, 10 A |
| Intervals de resistència | 200Ω, 2000Ω, 20kΩ, 200kΩ, 20MΩ |
| Prova de díode | Sí |
| Prova de continuïtat | Sí (amb brunzidor) |
| Mesura de la temperatura | Yes (°C, °F) |
| Retenció de dades | Sí |
| Llum de fons | Sí |
| Font d'alimentació | Bateria de 9 V |
| Pes de l'article | 150 g |
| Dimensions del producte | 150 x 100 x 100 cm |
| Classificació de seguretat | CATI 600V, CATII 300V (UL 61010-1, IEC 61010-2-030) |
10. Garantia i Suport
The UNI-T UT33C Digital Handheld Multimeter is designed for reliability and performance. For specific warranty details, please refer to the warranty card included with your product or contact your local UNI-T distributor or retailer.
For technical support, troubleshooting assistance, or service inquiries, please contact the authorized UNI-T service center or your point of purchase. Keep your purchase receipt as proof of purchase for warranty claims.
