| Customization: | Available |
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| After-sales Service: | Lifetime Technical Support |
| Warranty: | 1 Year for Circuit Breaker Contact Resistance Test |
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Introduction
100A 200A Circuit Breaker Testing Equipment Contact Resistance Tester Micro-Ohmmeter is used to test the contact resistance of circuit breaker or high current cable contacts.
100A 200A Circuit Breaker Testing Equipment Contact Resistance Tester Micro-Ohmmeter is designed according to IEC62271.
The main application of the tester is measurement of circuit breaker contact resistance.
All the test results of the tester could be print by the micro-printer which is integrated in the tester.
Also all the test results saved in the tester could be upload to PC computer and then convert to MS WORD document.
The four-wire (Kelvin) DC voltage drop is the typical method used by micro-ohmmeters for the contact resistance test, which ensures more accurate measurements by eliminating the own contact resistance and resistance of test leads.
The contact resistance test is performed using two current connections for the injection, and two potential leads for the voltage drop measurement; the voltage cables must be connected as closer as possible to the connection to be tested, and always inside the circuit formed by the connected current leads.
From the measurement of the voltage drop, the microprocessor controlled micro-ohmmeters calculate the contact resistance, while eliminates the possible errors due to thermal EMF effects in the connections (thermal EMFs are small thermocouple voltages which are generated when two different metals are joined together) they will be added to the total voltage drop measured, and will introduce errors into the contact resistance test if they are not subtracted from the measurement through different methods (reversal of polarity and averaging, directly measuring of thermal EMFs magnitude, etc.)
If low resistance readings are obtained when testing the breaker contact resistance using a low current, then it is recommended to re-test the contacts at a higher current. Why would we benefit using a higher current? A higher current will have the ability to overcome connection issues and oxidation on terminals, where a lower current may produce false (higher) readings under these conditions.
Specifications
| 1 | Measuring range | 0-1999.9 μΩ Resolution:0.1 μΩ |
| 2 | Measuring current | DC 100A, 200A, 400A, 600A for choice |
| 3 | Measuring precision | 0.5 %RGD+0.05%FS |
| 4 | Display mode | LCD |
| 5 | Data storage | Save no more than 100 groups of data |
| 6 | Data connection | RS232 computer interface |
| 7 | Rated power supply | AC220V |
| 8 | Size | 340mm× 280mm × 210mm |
| 9 | Environment temperature | -10 ºC~+40 ºC |
| 10 | Relative humidity | <80% |
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