Contact Resistance Meter: CRM100A
Motwane’s Contact Resistance Meter- CRM-100A is a Digital Micro Ohmmeter, designed to measure extremely low resistances. The instrument is based on the proven four wire measurement method for low resistances to eliminate the effect of lead resistance of two wire methods.
Motwane’s Contact Resistance Meter- CRM-100A is a Digital Micro Ohmmeter, designed to measure extremely low resistances. The instrument is based on the proven four wire measurement method for low resistances to eliminate the effect of lead resistance of two wire methods. The instrument is designed to replace a complex bridge set up with a single compact unit. The DC injection is adjustable between 10A to 100A. The testing information is displayed on a large LCD with a backlight and real-time data is displayed during the test ON conditions. The instrument gives a high resolution of 0.1μΩ on 200 μΩ resistance range. The instrument is easy to operate and user friendly. Accessories are rugged and come with heavy duty clips for better grip on the test objects. The kit and accessories are housed in a trolley mounted case for easy transportation. Advanced Dot Net based software is provided for data downloading, analysis, and report generation. The instrument can be operated through software from a remote location. Internal memory is provided for onsite data storage.
Application
Stationary and moving contacts are built from alloys that are formulated to endure the stresses of electrical arcing. However, if contacts are not maintained regularly, their electrical resistance builds up due to repeated arcing, resulting in a significant decrease in the contact’s ability to carry current and an increase in resistance. Excessive corrosion of contacts is detrimental to the breaker’s performance. Hence to check contacts, apply DC and measure the contact resistance or voltage drop across the closed contacts. The use of a higher current value gives more reliable results than using lower current values. The resistance value is usually measured in micro ohms (μΩ).
CRM-100A has a large application for direct and indirect measurements in various industries and manufacturing facilities. High accuracy and repeatability make it a reliable tool for quality assurance and easy operations. It is a very handy tool for quick maintenance checks in various industries.
Typical resistance measurement applications are:
- Circuit breaker contact resistance in non-energized areas
- Electrode resistance measurement
- Bus bar joints
- Isolator contacts
- Cable drum resistance measurement
- Cable splice
- Weld joints
- Bond resistance
Features
- Continuously selectable current in steps of 10, 20, 50 & 100A respectively
- Digital resistance reading from 0.1μΩ to 20mΩ
- Simultaneous display of test current and resistance
- Minimum resolution of 0.1μΩ
- Accuracy ± (0.5% +5 digits)
- 31⁄2-digits readings for resistance
- Custom-built LCD with a backlight and sealed soft touch membrane keypad
- Data exchange to PC through the USB interface
- Built-in memory to store up to 99 test results
- Test ‘ON’ indicator with LED & beep, provided to signify the flow of Direct Current to DUT
Output current :
DC test current: 10A, 20A, 50A & 100A
Accuracy: 5%
Open circuit voltage: 5V DC
Resistance Measurement:
| Resistance ranges | 200μΩ | 2mΩ | 20mΩ |
| Resolution | 0.1μΩ | 1μΩ | 10μΩ |
| Accuracy | ±(0.5% + 5 digits) | ||
Operation Time
Continuous operation up to 50A
4 minutes-ON and 10 minutes-OFF for 100A
Display
3½ digit large LCD display
PC interface
USB for data transfer
Warning
Audio-visual indication for test on operation
Indication on mains on the operation
Blinking display for over range indication
Power Supply
230V, 50Hz ± 10%
Environment
Operating Temperature: 0°C to 55°C
Storage Temperature: -10°C to 55°C
Humidity: < 90% RH, non condensing
Physical
Dimensions ( DxWxH in mm ) : 365 x 426 x 178
Weight : 12 Kg
Safety Standards
Safety : According to EN 61010 – 1
EMC : According to EN 61326 – 1
Accessories Standard
Output lead set 4 X 5m
Mains power cord
Mains protection fuse 5A
User manual
Calibration certificate
Carry case
Optional
Software CD
USB cord
Note: Do not use this instrument in the HT switchyard
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Motwane’s customer base is a testament to its ongoing ability to provide reliable, accurate, and long-lasting products, resulting in enduring relationships that are based on mutual satisfaction, loyalty, and trust.
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