Contact Resistance Measurement

Contact Resistance Measurement (5)

Tuesday, 11 August 2015 16:15 Written by

CRM 200B+

SCOPE introduces its next generation of hugely popular CRM series contact resistance meters,CRM200B+ in all new super light avatars, 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 100 / 200 Amps DC under live EHV switchyard conditions quickly & accurately.

CRM 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 millivolts signal in the presence of kilovolts 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.

Model CRM 200B+ having in-built 200 A current source make use of innovative technology that makes them the lightest 200 Amps micro-ohm meter available.

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.
  • Create device Under Test Identification data(DUT Library)on PC and upload to instrument.Save the test results in respective DUT folder in kit.Download the same to PC in similar folder structure.
  • 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 rechargeable Li-ion battery operated.In built battery monitorand cut off circuit for 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 (DC) 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 . 0 1 μ Ω , 0 . 1 μ Ω & 1 μ Ω on aboveRanges
Accuracy Value ± 1% ± 1 Digit
Output Voltage (Max.) 17.5 VDC
Operation Modes Stand Alone & PC Control
Display 4 Line X 20 character LCD. 4 ½ digit display for Test Current & Resistance
Printer In-built, Thermal Printer
Keypad 5 keys
Memory 1000 records, Internal
Inbuilt Battery Li-Ion, 11.1V, 4 Ah
Power Input to Battery Charger - 90 to 275 VAC, 50/60 Hz ± 10% ;100 to 300 VDC Charger output - 13.5 VDC, 1500 mA Max
Communication Port USB
Software CData CRM - For PC Control & PC Control, Downloading & Analysis, Windows based
Environment 0 to 50°C, Upto 95% RH (Non condensing)
Dimension 340 x 295 x 155 mm
Instrument Weight 5 kg
Tuesday, 11 August 2015 16:16 Written by

CRM 100B+

SCOPE introduces its next generation of hugely popular CRM series contact resistance meters, CRM 100B+ in all new super light avatars, 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 100 Amps DC under live EHV switchyard conditions quickly & accurately.

CRM 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 millivolts signal in the presence of kilovolts 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.

Models CRM 100B+ having in-built 100A current source making use of innovative technology that makes them the lightest 100 Amps micro-ohm meter available.

 

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.
  • Create Device Under Test Identification data (DUT Library) on PC and upload to instrument. Save the test
  • Results in respective DUT folder in kit. Download the same to PC in similar folder structure.
  • 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 rechargeable Li-ion battery operated. In built battery monitor and cut off circuit for
  • 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 (DC) 100A plus. Peak Test Current will be decided by the load resistance, however100 A minimum is guaranteed.
Resistance Range 0-200μΩ, 2000μΩ, 20mΩ ( Autoranging)
Resolution 0.1 μΩ, 1 μΩ & 10 μΩ on above ranges
Accuracy Value ± 2% ± 1 Digit
Output Voltage(Max) 10 VDC
Operation Modes Stand Alone & PC Control
Display 4 Line X 20 character LCD. 3 ½ digit display for Test Current & Resistance
Printer In-built, Thermal Printer
Keypad 5 keys
Memory 1000 records, Internal
Inbuilt Battery Li-Ion, 11.1V, 4 Ah
Battery Charger

Input Supply - 100 to 300 VAC, 50/60 Hz ± 10% 

Output Voltage - 13.5 VDC, 1000 mA

Communication Port

USB

Software

CData CRM - For PC Control & PC Downloading & Analysis, Windows based

Environment

0 to 50°C, Upto 95% RH (Non condensing)

Dimension

340 x 295 x 155 mm

Instrument Weight

4 kg

Tuesday, 11 August 2015 16:17 Written by

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 DUT’s 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 Menus structure enables user to take test easily.
  • PC downloading facility is available with CData – PC Downloading & Data Management Software. (Optional)

 

Specifications

  • Accuracy : Value ± 0.5 % ± 5 digits
  • Current : 10, 20, 50, 100 A DC, selectable
  • Displays : One backlit 4 line LCD for interactive menu, test results, keyboard functions and messages
  • Test Results : 3½ digit for resistance and current values
  • Test Leads : Calibrated Test Cables, 15 m long, 150A rating
  • 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 switch yard environment
Test Current Range Resolution 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

Tuesday, 11 August 2015 16:21 Written by

CRM 200B

CRM 200B directly measures micro-ohm values at 200 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 amplifier, 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 wall 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.
  • 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
Tuesday, 11 August 2015 16:24 Written by

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 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