1. Introducció
The LUTRON MO-2002 is a high-precision benchtop miliohm meter designed for accurate resistance measurements across a wide range. Utilizing a four-wire measurement technique, it ensures precise readings, especially for very low impedance values. This manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of your MO-2002 Miliohm Meter.
2. Informació de seguretat
ADVERTIMENT:
- This instrument contains no user-serviceable parts. Do not attempt to open or repair the device. All servicing should be performed by qualified personnel only.
- Assegureu-vos que la font d'alimentació correcta voltage (AC110V or AC220V, 50/60Hz) is used as specified for your unit.
- Observe all safety precautions when working with electrical circuits.
- The device is rated CAT II 240V. Do not use it for measurements exceeding this rating.
3. Característiques clau
- Wide measuring range: 0.01mΩ to 20KΩ across 7 selectable ranges.
- Four-wire measurement technique for high accuracy, especially for low impedance values.
- Integrated high/low range alarm with audible (beeping) and visual (LED) indications.
- Built-in overload protection for enhanced durability and safety.
- Benchtop design for stable and convenient operation.
- Clear digital display for easy reading of measurement results.
4. Especificacions
4.1 Especificacions generals
| Paràmetre | Valor |
|---|---|
| Measurement Range (Test Current) | 20 mΩ (1A DC) / 200 mΩ (1A DC) / 2Ω (100mA DC) / 20Ω (10 mA DC) / 200Ω (1 mA DC) / 2KΩ (100μA DC) / 20KΩ (10μA DC) |
| Configuració d'alerta | Alarm setting, upper and lower setting values can be set by LED. Buzzer alarm sound. |
| Temperatura de funcionament | 0 ~ 50 °C |
| Humitat de funcionament | Lower than 80% R.H. |
| Font d'alimentació en funcionament | AC110V±15%, 50/60Hz or AC230V±15%, 50/60Hz (as specified for your unit) |
| Working Power Fuse | 200mA/250V, Size 5*20mm dia. |
| Dimensions físiques | 280 x 210 x 90 mm |
| Pes | Aproximadament 2.2 kg |
| Tipus de visualització | Només digital |
| Certificació | CE |
| Bateria inclosa | Yes (Internal, not user-serviceable) |
4.2 Measurement Range and Accuracy
| Interval | Resolució | Road Voltage | Corrent de prova | Precisió |
|---|---|---|---|---|
| 20 mΩ | 0.01 mΩ | About 2.7 VDC | 1A | ±(0.2% + 6 dígits) |
| 200 mΩ | 0.1 mΩ | About 3.3 VDC | 1A | ±(0.2% + 4 dígits) |
| 2Ω | 1 mΩ | About 3.5 VDC | 100 mA | |
| 20Ω | 0.01Ω | About 4.1 VDC | 10 mA | |
| 200Ω | 0.1Ω | About 4.5 VDC | 1 mA | |
| 2 KΩ | 0.001 KΩ | About 4.5 VDC | 100μA | |
| 20 KΩ | 0.01 KΩ | About 4.5 VDC | 10μA |
4.3 Circuit obert Voltage
| Interval | Circuit obert Voltage |
|---|---|
| 20 mΩ | About 2.7 VDC |
| 200 mΩ | About 3.3 VDC |
| 2Ω | About 3.5 VDC |
| 20Ω | About 4.1 VDC |
| 200Ω | About 4.5 VDC |
| 2 KΩ | About 4.5 VDC |
| 20 KΩ | About 4.5 VDC |
5. Contingut del paquet
En desempaquetar, comproveu que tots els elements que s'enumeren a continuació hi són presents i en bon estat:
- LUTRON MO-2002 Miliohm Meter (1 unit)
- Cable d'alimentació (1 unitat)
- 4-wire Test Clamp (Kling clamp) (1 pair)
- Operating Instructions (1 copy)
6. Configuració
- Col·locació: Place the MO-2002 meter on a stable, flat surface, away from strong electromagnetic fields, direct sunlight, and excessive heat or moisture.
- Connexió d'alimentació:
- Assegureu-vos que l'interruptor d'alimentació del panell posterior estigui en la posició "OFF".
- Connect the provided power cord to the AC inlet on the rear panel of the meter.
- Plug the other end of the power cord into a suitable AC power outlet (AC110V or AC220V, 50/60Hz, depending on your unit's specification).
- Connexió del cable de prova:
- Identify the four input terminals on the front panel: FORCE+, SENSE+, SENSE-, FORCE-.
- Connect the 4-wire test clamps to these terminals. Typically, the red leads connect to FORCE+ and SENSE+, and the black leads connect to SENSE- and FORCE-. Ensure a secure connection.
7. Funcionament
- Encès: Flip the power switch on the rear panel to the "ON" position. The display should illuminate.
- Selecció de rang:
- Use the range selection buttons on the front panel (e.g., 20mΩ, 200mΩ, 2Ω, 20Ω, 200Ω, 2KΩ, 20KΩ) to select the appropriate measurement range.
- Start with a higher range if the resistance value is unknown to avoid overloading the meter. Adjust downwards for better resolution.
- Connecting to the Device Under Test (DUT):
- Ensure the DUT is de-energized and safe to test.
- Connect the 4-wire test clamps to the points on the DUT where resistance is to be measured. The FORCE leads inject current, and the SENSE leads measure the voltage drop, minimizing lead resistance errors.
- Prendre una mesura:
- Once the DUT is connected and the range is selected, the resistance value will be displayed on the digital screen.
- Allow a few seconds for the reading to stabilize.
- Comparator Function (Hi/Lo Alarm):
- The MO-2002 features a comparator function with Hi/Lo alarm settings.
- Use the "Comparator Set" knobs (HI and LO) to set the upper and lower resistance thresholds.
- When a measurement falls outside these thresholds, the corresponding HI or LO LED will light up, and the buzzer will sound (if enabled).
- This feature is useful for production line testing or quality control to quickly identify out-of-spec components.
- Apagueu: After use, disconnect the test leads from the DUT, then turn off the meter using the power switch.
8. Manteniment
- Neteja: Wipe the meter's exterior with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Emmagatzematge: Store the meter in a cool, dry place, away from direct sunlight and extreme temperatures.
- Calibració: For continued accuracy, periodic calibration by a qualified service center is recommended.
- Substitució de fusibles: If the meter fails to power on, check the power fuse located on the rear panel. Replace it only with a fuse of the same type and rating (200mA/250V, 5x20mm dia.). Ensure the meter is disconnected from the power supply before attempting fuse replacement.
9. Solució De Problemes
| Problema | Causa possible | Solució |
|---|---|---|
| El mesurador no s'encén. | No power from outlet, faulty power cord, blown fuse. | Check power outlet, inspect power cord, replace fuse (see Maintenance section). |
| Lectures inexactes o inestables. | Poor connection of test leads, incorrect range selected, external interference, meter out of calibration. | Ensure test leads are securely connected to both meter and DUT. Select appropriate range. Move meter away from strong electrical noise sources. Consider professional calibration. |
| HI/LO alarm constantly active. | Comparator thresholds set incorrectly, DUT resistance outside expected range. | Adjust HI/LO comparator settings. Verify the actual resistance of the DUT. |
| "OL" or "OVERLOAD" displayed. | Resistance value exceeds the selected range. | Select a higher measurement range. |
10. Consells d'usuari
- Always use the 4-wire Kelvin connection method for critical low-resistance measurements to eliminate the resistance of the test leads from the measurement.
- For highly inductive loads, allow sufficient time for the reading to stabilize.
- When measuring very low resistances, ensure good contact between the test clamps and the material being measured to prevent contact resistance from affecting readings.
- Regularly check the test leads for any signs of damage or wear, as this can impact measurement accuracy.
11. Garantia i Suport
LUTRON products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please contact your local LUTRON distributor or the point of purchase. Please have your model number (MO-2002) and purchase details ready when contacting support.
