Contact Resistance Measurement (5)
CRM 100B
CRM 100B directly measures micro-ohm values at 100 Amps DC under live switchyard conditions.
CRM 100B is specially designed to reliably measure contact resistance of circuit breakers, isolators, busbar joints, welded joints etc., under the hostile electrostatic noise found in live EHV switchyards upto 765 kV.
Inbuilt rechargeable battery tremendously enhances utility as AC supply connectivity is not required.
CRM 100B operates on a rechargeable battery as well as Mains supply. It has a built-in constant current source, a precision instrumentation amplifi er, digital readout and control logic.A pulse of 100A DC is passed through the test object and voltage drop is sensed using the classical Kelvin’s 4 wire method to measure contact resistance. Both test current and resistance value are displayed on LCD.
Features
- A radically new design makes CRM the lightest available contact resistance meter.
- Battery as well as Mains operated.
- Direct display of micro-ohm value does away with manual calculations.
- Fool-proof connections and repeatability are ensured by
- SCOPE’s specially designed proprietory Ck clamps.
- Supplied with rugged calibrated test lead set suitable for 4 wire measurement.
Specifications
- Ranges : 199.9μΩ and 1999μΩ
- Resolution : 0.1μΩ and 1μΩ
- Accuracy : Value ± 2 % ± 1 digit
- Current : 100 A DC
- Displays : Two, 3½ digit, ½ inch LCD, for current and resistance values
- Power : 230 V AC ± 15%, 50 Hz ± 10%, 75 VA
- Battery : Instrument operates on inbuilt rechargeable battery (2 nos. 6V, 4.5Ah)
- Dimensions : 435 x 350 x 170 mm
- Weight : 9 kg, instrument
- Environment: 0° to 50° C max, 95 % RH (non-condensing), Live EHV switchyard environment
CRM 100C
CRM 100C directly measures resistance values with DC current injection under live switchyard conditions.The CRM 100C is specially designed to reliably measure contact resistance of Circuit Breakers, Isolators, Bus Bar joints, welded joints etc., under the hostile electrostatic noise found in live EHV switchyards. It can also be used for testing cables, graphite bars etc.
It has a truly continuous current source without any ON/OFF duty cycle
Features
- Innovative design makes CRM 100C the lightest available continuous current contact resistance meter
- Direct display of micro-ohm value does away with manual calculations
- Fool-proof connections and repeatability are ensured by SCOPE’s specially designed proprietory Ck clamps
- Supplied with rugged calibrated test lead set satisfying Kelvin’s 4 wire measurement principle.
- Selectable current ranges allows user to test various DUTs having wide resistance range.
- Every current range is associated with selectable resistance range to achieve better resolution of results.
- LED indication makes user aware about current injection status.
- User-friendly Menu structure enables user to take test easily.
- PC downloading facility is available with CData – PC Downloading & Data Management Software.(Optional)
Specifications
- Current : 10, 20, 50, 100A DC
- Accuracy : Value ± 0.5 % ± 5 digit
- Display : One backlit 4 line LCD for interactive menu, test results, keyboard functions and messages,test results, 3½ digit for resistance and current values
- Power : 230 V AC ± 15%, 50 Hz ± 10%, 500 VA
- Dimensions : 475 x 405 x 175 mm
- Weight : 11 kg, instrument
- Environment: 0° to 50° C max, 95 % RH (non-condensing), Live EHV switchyard environment
- Ranges : On SCOPE’s Calibrated Test Leads as follows
| Test Current | Resistance Range | Resolution |
| 100A |
199.9µΩ 1999µΩ 19.99mΩ |
0.1µΩ 1µΩ 0.01mΩ |
| 50A | 1999µΩ
19.99mΩ |
1µΩ
0.01mΩ |
| 20A | 1999µΩ
19.99mΩ 199.9mΩ |
1µΩ
0.01mΩ 0.1mΩ |
| 10A | 19.99mΩ
199.9mΩ 1999mΩ |
0.01mΩ
0.1mΩ 1mΩ |
CRM 200B
CRM 200B directly measures micro-ohm values at 100 Amps DC under live switchyard conditions.
CRM 200B is specially designed to reliably measure contact resistance of circuit breakers, isolators, busbar joints, welded joints etc., under the hostile electrostatic noise found in live EHV switchyards upto 765 kV.
Inbuilt rechargeable battery tremendously enhances utility as AC supply connectivity is not required.
CRM 200B operates on a rechargeable battery as well as Mains supply. It has a built-in constant current source, a precision instrumentation amplifi er, digital readout and control logic.A pulse of 200A DC is passed through the test object and voltage drop is sensed using the classical Kelvin’s 4 wire method to measure contact resistance. Both test current and resistance value are displayed on LCD.
Features
- A radically new design makes CRM the lightest available contact resistance meter
- Battery as well as Mains operated
- Direct display of micro-ohm value does away with manual calculations
- Fool-proof connections and repeatability are ensured by SCOPE’s specially designed proprietary Ck clamps
- Supplied with rugged calibrated test lead set suitable for 4 wire measurement
- Additional range of 20 mΩ is provided
Specifications
- Ranges : 199.9μΩ, 1999μΩ and 19.99mΩ
- Resolution : 0.1μΩ,1μΩ and 10μΩ respectively
- Accuracy : Value ± 1% ± 1 digit
- Current : 200 A DC
- Displays : Two, 3½ digit, ½ inch LCD, for current and resistance values
- Power : 230 V AC ± 15%, 50 Hz ± 10%, 75 VA
- Battery : Instrument operation on inbuilt , rechargeable battery (2 nos. 6V, 4.5Ah)
- Dimensions : 435 x 350 x 170 mm
- Weight : 9 kg, instrument
- Environment: 0° to 50° C max, 95 % RH (non-condensing), Live EHV switchyard environment
CRM 200B+
SCOPE introduces its next generation of hugely popular CRM series contact resistance meter, CRM200B+ in all new super light avatar, based on cutting edge ultra capacitor technology. CRM incorporates some state of the art hardware & smart software features making it a must have tool for testing & maintenance engineers.
CRM directly measures micro-ohm values at 200A DC under live EHV switchyard conditions quickly & accurately. It is specially designed to reliably measure micro-ohm contact resistances of Circuit Breakers, Isolators, Busbar joints, earth switch joints, welded joints etc., under the hostile electrostatic noise found in live EHV switchyards up-to 765 kV. SCOPE’s ability to make electronics work in such environment enables CRM to measure mili-volts signal in the presence of kilo-volts noise.
CRM is equally suitable for MV / HV / EHV equipments and is very useful to Power Companies, Equipment Manufacturers, Testing & Commissioning Companies and Test Laboratories etc.
Features
- A radically new design makes CRM the lightest available contact resistance meter.
- Simultaneous & multiple samples of test current and voltage drop are taken at high speed using fast & high resolution ADCs.
- Resistance will be calculated by taking actual V/I ratio and averaging of individual samples giving stable & accurate results. It makes it independent of test current variations.
- Autoranging. Direct display of micro-ohm value does away with manual calculations.
- In built real time clock, memory and printer. Test time stamping on each record enables time references for future use.
- Fool-proof connections and repeatability are ensured by SCOPE’s specially designed proprietary Ck clamps.
- Supplied with rugged calibrated test lead set suitable for 4 wire measurement.
- Optimised test lead set design gives lengths enough for testing EHV CBs, yet are lightweight.
- Mains as well as battery operations
- Protection against battery deep discharge.
- Simple operation. Tests can be conducted even by technicians.
- Instrument is continuously available for measurements one after the other. No ON/OFF duty cycle.
- Enclosed in ultra rugged IP67 class hard moulded case.
- PC Downloading & Analysis including ‘Trend Analysis’ possible with “CData CRM+” Software supplied with kit.
- Instrument debug options like memory check, printer check, PC downloading check are provided.
Specifications
| Parameter | CRM 200B+ |
| Test Current | 200A plus. Peak Test Current will be decided by the load resistance, however 200A minimum is guaranteed |
| Resistance Range | 0 - 200µΩ, 2000µΩ, 20mΩ, Autoranging |
| Resolution | 0.01µΩ, 0.1µΩ & 1µΩ for above range respectively |
| Accuracy | Value ± 1% ± 1 Digit |
| Output Voltage (max) | 17.5V DC |
| Operation Mode | Stand Alone & PC Control |
| Display | 4 Line X 20 character LCD. 4 ½ digit display for Test Current & Resistance |
| Printer | In-built Thermal Printer |
| Memory | 1000 records Internal |
| In-Built Battery | Li-Ion, 11.1V, 6 Ah |
| Power |
Input to Battery charger: 90-275V AC , 50Hz ±10%, 100 to 300V DC Charger output - 13.5 V DC, 1500 mA Max |
| Communication Port | USB |
| Software | CData CRM - For PC Control & PC Control, Downloading & Analysis, Windows based |
| Environment | 0 to 50°C, up to 95% RH (non-condensing) |
| Dimension | 340 x 295 x 155 mm |
| Weight | 5kg |
CRM 100B+
SCOPE introduces its next generation of hugely popular CRM series contact resistance meter, CRM100B+ in all new super light avatar, based on cutting edge ultra capacitor technology. CRM incorporates some state of the art hardware & smart software features making it a must have tool for testing & maintenance engineers.
CRM directly measures micro-ohm values at 100A DC under live EHV switchyard conditions quickly & accurately. It is specially designed to reliably measure micro-ohm contact resistances of Circuit Breakers, Isolators, Busbar joints, earth switch joints, welded joints etc., under the hostile electrostatic noise found in live EHV switchyards up-to 765 kV. SCOPE’s ability to make electronics work in such environment enables CRM to measure mili-volts signal in the presence of kilo-volts noise.
CRM is equally suitable for MV / HV / EHV equipments and is very useful to Power Companies, Equipment Manufacturers, Testing & Commissioning Companies and Test Laboratories etc.
Features
- A radically new design makes CRM the lightest available contact resistance meter.
- Simultaneous & multiple samples of test current and voltage drop are taken at high speed using fast & high resolution ADCs.
- Resistance will be calculated by taking actual V/I ratio and averaging of individual samples giving stable & accurate results. It makes it independent of test current variations.
- Autoranging. Direct display of micro-ohm value does away with manual calculations.
- In built real time clock, memory and printer. Test time stamping on each record enables time references for future use.
- Fool-proof connections and repeatability are ensured by SCOPE’s specially designed proprietary Ck clamps.
- Supplied with rugged calibrated test lead set suitable for 4 wire measurement.
- Optimised test lead set design gives lengths enough for testing EHV CBs, yet are lightweight.
- Mains as well as battery operations
- Protection against battery deep discharge.
- Simple operation. Tests can be conducted even by technicians.
- Instrument is continuously available for measurements one after the other. No ON/OFF duty cycle.
- Enclosed in ultra rugged IP67 class hard moulded case.
- PC Downloading & Analysis including ‘Trend Analysis’ possible with “CData CRM+” Software supplied with kit.
- Instrument debug options like memory check, printer check, PC downloading check are provided.
Specifications
| Parameter | CRM 100B+ |
| Test Current | 100A plus. Peak Test Current will be decided by the load resistance, however 100A minimum is guaranteed |
| Resistance Range | 0 - 200µΩ, 2000µΩ, 20mΩ, Autoranging |
| Resolution | 0.1µΩ, 1µΩ & 10µΩ for above range respectively |
| Accuracy | Value ± 2% ± 1 Digit |
| Output Voltage (max) | 10V DC |
| Operation Mode | Stand Alone & PC Control |
| Display | 4 Line X 20 character LCD. 3 ½ digit display for Test Current & Resistance |
| Printer | In-built Thermal Printer |
| Memory | 1000 records Internal |
| In-Built Battery | Li-Ion, 11.1V, 6 Ah |
| Power |
Input to Battery charger: 90-275V AC , 50Hz ±10%, 100 to 300V DC Charger output - 13.5 V DC, 1500 mA Max |
| Communication Port | USB |
| Software | CData CRM - For PC Control & PC Control, Downloading & Analysis, Windows based |
| Environment | 0 to 50°C, up to 95% RH (non-condensing) |
| Dimension | 340 x 295 x 155 mm |
| Weight | 4kg |