Product Details

Main Functions:

Used to test the DC resistance of switch contacts, circuit breaker contacts, busbars, joints, SF6 switches, various connections, fuses, and railway connections. Working principle: The M400 uses a silicon-controlled rectifier circuit to adjust the test current to a preset value. This current, after rectification and filtering, is applied to the sample under test, and the resistance value is directly measured. In this current, the voltage is applied across the unknown circuit under test and a known resistance circuit for comparison, and the reading is displayed on a digital ammeter. The test principle adopts a four-terminal measurement method. The four-terminal connection is used for the unknown resistance under test and its parallel circuit. The test circuit and its selection switch determine the test range.

1. Before using this instrument, you must carefully read this manual.

2. The operator of the instrument should have general electrical knowledge.

3. Avoid using the instrument in places with rain, corrosive gases, excessive dust, high temperature, direct sunlight, etc.

4. The instrument should avoid severe vibration.

5. After testing, be sure to wait until the discharge alarm sound stops before turning off the power and removing the test leads.

6. When measuring no-load tap-changing transformers, be sure to wait until the discharge indication alarm sound stops before switching gears.

7. During testing, it is prohibited to move the test clips and power supply lines.

Introduction:

(1) Data processing adopts automatic storage and microcomputer printing methods. All test data is filled into corresponding tables in real time, avoiding manual transcription and recording processes, ensuring the authenticity and reliability of the data.

(2) The voltage and current ratio can be set, and the measured value is directly displayed;

(3) The test bench uses an Access database to store raw data, which can conveniently store all parameters of the tested equipment, test data, ambient temperature, test

date and other information together, forming equipment files for future query and analysis.

(4) Can measure power in the low power factor range;

(5) Strong anti-interference capability, with overload alarm indication, line misconnection protection, and overvoltage and overcurrent protection functions.

Precautions:

1. For no-load tap-changing windings, it is not allowed to switch the no-load tap changer during testing or before the discharge is complete.

2. For inductive test objects, it is not allowed to remove the test leads before the discharge is complete (when the buzzer is sounding) to avoid electric shock.

3. If an external AC220V power failure occurs suddenly during testing, the instrument will start automatic discharge. At this time, it is not allowed to remove the test leads immediately; wait 5 minutes before removing the leads.

Technical Specifications:

1. Output current: 5A, 10A

2. Measurement range: 5A: 1mΩ～4Ω　10A: 1mΩ～1Ω

3. Resolution: 1μΩ

4. Test accuracy: 0.2 class

5. Working temperature: -10℃～50℃

6. Working humidity: 0～80%

7. Working power supply: AC 220V±10% 50Hz±1Hz

Software Introduction:

1. The software installation conditions can work normally under Windows 98, Windows 2000, Windows XP, and other software;

2. Basic functions of the software:

① The transformer comprehensive test bench software can operate and control the transformer turns ratio tester, transformer winding DC resistance tester, and transformer characteristic tester;

② The transformer comprehensive test bench software can query by test number, capacity, and test date;

3. Specific requirements for the transformer comprehensive test bench software:

① The software has a friendly human-machine interface, and the operation is intuitive and simple;

② The software can automatically receive downloaded data and also allow manual data entry.

★Voltage/Current Transformer Control Cabinet (optional);

★Power Control Cabinet (optional);

★System Auxiliary Cabinet (optional);

★Transformer No-Load and Load Loss Characteristic Tester (Power Analyzer);

★Transformer DC Resistance Tester;