METRAVI PRO 7275 Digital Mirco Ohms Meter DC Resistance Tester User Guide

METRAVI PRO 7275 Digital Mirco Ohms Meter DC Resistance Tester

Product Information

Specifications

• Power Supply:
  • PRO 7275: DC 7.4V 5200mAh, rechargeable lithium battery, full charge about 8.4V.
  • PRO 7275A: DC 7.4V 7800mAh, rechargeable lithium battery, full charge about 8.4V.
• Measurement Method: Precision 4-wire method, 2 channel AID detecting simultaneously.
• Measurement Modes:
  • Automatic mode
  • Manual mode
• Measurement Range:
  • PRO 7275: 10.0uW ~ 50.00kW
  • PRO 7275A: 1.0uW ~ 50.00kW
• Test Current:
  • PRO 7275: 10A, 1A, 100mA, 10mA, 2mA, 1mA, Automatic
  • PRO 7275A: 20A, 10A, 1A, 100mA, 10mA, 2mA, 1mA, Automatic
• Temperature Measurement
• Measurement Time : AD sampling rate of 1 per second
• Data Storage : 600 groups (data not lost after power failure or battery replacement)
• Alarm Setting : Alarm critical value setting range of 1mW ~ 2500W. 0W does not start the alarm function. Will not start the alarm function every time the tester is started up.
• Alarm Indication : When the test value exceeds the alarm setting value, the buzzer will make a sound and prompt an alarm.
• Test Indication : Blue TESTING light flashes during testing.
• Charge Indication: During charging, the charger indicator lamp glows red, and on full charge, it glows green.
• Data Hold : The test results are retained on the display automatically after each testing.
• Blacklight Adjust : The slider adjusts the brightness.
• Clock Function

Product Usage Instructions

Measurement Modes
The Digital Mirco Ohms Meter / DC Resistance Tester PRO 7275 and PRO 7275A come with two measurement modes: Automatic mode and Manual mode. In the Automatic mode, the tester will automatically select the  appropriate measurement range and accuracy based on the resistancebeing measured. This mode is recommended for general use. In the Manual mode, you can manually select the desired measurement range and accuracy. This mode is useful when you require specific settings for your measurements.

Test Current Selection
The tester allows you to select the test current based on your requirements. The available test currents are:

• PRO 7275: 10A, 1A, 100mA, 10mA, 2mA, 1mA, Automatic
• PRO 7275A: 20A, 10A, 1A, 100mA, 10mA, 2mA, 1mA, Automatic

Choose the appropriate test current based on the resistance being measured and the precision required for your measurements.

Temperature Measurement
The tester includes a temperature measurement function. This allows you to measure the temperature of the test product during resistance measurements. The temperature measurement helps compensate for resistance changes due to heat generated during testing.

Alarm Function
The tester features an alarm function that allows you to set a resistance alarm value. When the measured resistance exceeds the set alarm value, the tester will sound an alarm to alert you.

Automatic Shutdown
The tester has an automatic shutdown feature that automatically turns off the device after 15 minutes of non-operation. This helps conserve battery power and prolong the lifespan of the device.

**PRODUCT FUNCTION

**

For measuring Transformer Winding Resistance; Grounding Continuity Resistance; Cable & Conductor Resistance; Contact Resistance of Switches, Connectors and Relays; Metal Riveting Resistance; Winding Resistance of Coils, Motor and Transducer; Connection Resistance between Metal Components; Welding Point Resistance; Battery Parallel Connection Resistance; Wire Length Measurement and Calculations, etc.

PRODUCT FEATURES

• The tester is controlled by a high-speed, single-chip microcomputer, with fast response speed, stable measurement and easy operation.
• With two measurement modes.
  • Automatic Mode: the test current can be automatically selected according to the load.
  • Manual Mode: 7 gears test currents can be chosen: 10A, 1A, 100mA, 10mA, 2mA and 1mA.
• Equipped with a 480×854 true colour LCD touchscreen, which is clearly visible even under bright light and can be operated by using both touchscreen or panel buttons.
• A large capacity, rechargeable, lithium battery and a waterproof case make the devices suitable for outdoor use.
• With Bluetooth communication function, it can run test operations or enable viewing test result on a mobile phone using the free Smartphone App.
• The tester features USB interface and built-in monitoring software, which can communicate with the computer.

Measurement Range and Accuracy

Rated Voltage| Measurement Rage| Accuracy| Resolution| Test Current
---|---|---|---|---

Measurement Range & Accuracy

| 1.0uΩ ~ 1000.0uΩ| ±0.2%FS±1uΩ| 0.1uΩ| 20A
10.0uΩ ~ 1000.0uΩ| ±0.2%FS±1uΩ| 0.1uΩ| 10A
1.000MΩ ~ 100.000MΩ| ±0.2%FS±5uΩ| 1uΩ| 10A
100.00MΩ ~ 1000.00MΩ| ±0.2%FS±50uΩ| 10uΩ| 1A
1.000Ω ~ 10.000Ω| ±0.2%FS±5mΩ| 1mΩ| 100mA
10.00Ω ~ 100.00Ω| ±0.2%FS±0.5Ω| 10mΩ| 10mA
100.0Ω ~ 1000.0Ω| ±0.2%FS±5Ω| 0.1Ω| 2mA
1.00kΩ ~ 50.00kΩ| ±0.2%FS±0.5kΩ| 0.01kΩ| 1mA

“ ***** ” symbol indicates specification for PRO 7275A only

• The protection function is perfect and reliably protects the impact on the back EMF on the instrument, making the performance more reliable.
• With the discharging function, automatically discharge after tests and avoid any mis-operation.
• Converting resistance function compensates for the resistance change due to the heat generated and compensates for the temperature of the test product.
• Alarm function : the resistance alarm value can be set.
• Automatic shutdown : the tester automatically shuts down after 15 minutes of non-operation.

TECHNICAL SPECIFICATIONS

• Power Supply:
  

  • PRO 7275 : DC 7.4V 5200mAh, rechargeable lithium battery, full charge about 8.4V.
  • PRO 7275A : DC 7.4V 7800mAh, rechargeable lithium battery, full charge about 8.4V.

• Measurement Method:  Precision 4-wire method, 2 channel AID detecting simultaneously.

• Measurement Modes: Automatic mode, Manual mode.

• Measurement Range:

  • PRO 7275 : 10.0uW ~ 50.00kΩ.
  • PRO 7275A : 1.0uW ~ 50.00kΩ.

• Test Current:

  • PRO 7275 : 10A, 1A, 100mA, 10mA, 2mA, 1mA, Automatic.
  • PRO 7275B : 20A, 10A, 1A, 100mA, 10mA, 2mA, 1mA, Automatic.

• Temperature Measurement:
  

  • Range : -55°C ~ 125°C;
  • Accuracy : ±0.5°C.

• Measurement Time: AD sampling rate 1 per second

• Data Storage:  600 groups (data not lost after power failure or battery replacement).

• Alarm Setting: Alarm critical value setting range; 1mW ~ 2500Ω. 00Ω does not start the alarm function. Will not start the alarm function in start up tester every time.

• Alarm Indication:  Will not start the alarm function in start up tester every time. When the test value exceeds the alarm setting value, the buzzer will make out sound an alarm prompt.

• Test Indication: Blue “TESTING” light flashes during the testing.

• Charge Indication:  During charging, the charger indicator lamp glows red, on full charge it glows green.

• Data Hold:  The test results are retained on the display automatically after each testing.

• Blacklight Adjust:  The slider adjusts the brightness.

• Clock Function:  With a 24-hour time system, display hour, minutes, seconds.

• Conversion Resistance Calculation: Calculated according to the temperature and material of the tested product.

• Discharge Function:  Automatic discharge after testing, with clear discharge indication to avoid mis-operation.

• Display Mode:
  

  • LCD : 128mm x 75mm.

• Automatic Shutdown:  After 15 minutes of non-operation, meter will automatically shutdown to save power.

• Test Wires:  Each 1pcs of red and black, length is 5m; 1pcs wire for temperature sensor, length is 1m.

• Display Mode:  480mm X 854mm true colour touchscreen.

• Dimensions: 280mm X 260mm X 160mm.

• Weight:
  

  • Total weight: 4632g (including accessories).

• Overflow Display: Exceed range overflow display with 99999 digits.

• Low Voltage Indication: When battery voltage is lower than DC 7.2V±0.1V, low battery voltage symbol turns red as reminder to recharge the battery.

• Working Temperature: – 10°C ~ 40°C; below 80%RH.

• Storage Temperature: – 10°C ~ 60°C; below 70%RH.

• Protection Level: IP65 (for closed case).

• USB Interface:  With USB interface and monitoring software, storage data can be uploaded to computer, saved and printed.

• Dielectric Strength: AC 3700V/RMS (between the shell and screw).

• Suitable Safety Standards:
  

  • IEC61010-1, CAT Ill 600V, Pollution Level 2 ,
  • JJG724-1991 (Verification Regulation Of D.C. Digital Ohmmeter),
  • JJG166-1993 (Verification Regulation Of D.C. Resistors),
  • DL/967-2005 (Verification Regulation of Loop Resistance Tester and DC Resistance High-speed Tester).

Accessories

1. Tester;
2. 2 Test Wires;
3. Charger;
4. Temperature Sensor;
5. USB Communication Cable;
6. Insulated Tool Bag

METRAVI INSTRUMENTS PVT. LTD. 32A Ganesh Chandra Avenue, 4th Floor, Kolkata 700013, West Bengal, India

www.metravi.com +91-33-22151376 / 40448445 erp@metravi.com

FAQ’s

How many data points can be stored in the tester?

The tester can store up to 600 groups of data. The stored data will not be lost even after power failure or battery replacement.

How do I adjust the brightness of the backlight?

The tester is equipped with a slider that allows you to adjust the brightness of the backlight. Slide the slider to increase or decrease the brightness according to your preference.

What does the charge indication light indicate?

During charging, the charger indicator lamp will glow red. Once the battery is fully charged, the indicator lamp will glow green.

References

• Home - Metravi Instruments

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