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Contact Resistance
opposition to the flow of heat or electricity within a connection.
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8 Function True RMS Multimeter
Extech EX360
Extech Instruments Corporation
The EX360 is a Compact Electrical True RMS MultiMeter with a Built in Non Contact Voltage Detector. Featuring highly accurate True RMS measurements, LoZ for the prevention of false readings caused by ghost voltages, .5% basic accuracy, a 1000V AC/DC volt range, resistance up to 40MΩ, continuity beeper with visual alert, smart data hold, peak hold, auto power off with disable, relative mode for capacitance zero and offset adjustment. Additionally, the EX360 excels in frequency and capacitance measurement. Complete with test leads, 9V battery, holster with tilt stand and built-in magnet.
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Circuit Breaker Analyzers & Timers
CAT Handheld Series
When it’s not practical to use conventional robust circuit breaker analyzers, a handheld circuit breaker analyzer and timer may come handy. DV Power has developed a unique CAT Handheld series. It is specially designed for testing of circuit breakers with one break per phase. Their compact and ergonomic design can provide a wide range of features and reliable operations in low, medium and high-voltage substations or in industrial environments.CAT Handheld series consists of two models, CAT-P and CAT-H. Both of them have a large (5,7 in) colored touch screen display. Because of that, test results are visible in dark places as well as in bright sunlight.Powerful internal Li-Ion battery of the instruments can last up to 8 hours of testing without recharging.CAT Handheld series records:main contacts operating times,contact synchronization,sequence time,a resistance of pre-insertion resistors,open and close coil currents,main contacts bounce time,auxiliary contact time,DC Voltage.Multiple operations, such as Open-Close and Open-Close-Open, can be initiated by using a predefined delay time or by triggering signal from current clamps connected to circuit breaker coil.CAT-H is capable of performing a coil control, while this feature is optional at CAT-P instrument. In contrast to CAT-H, CAT-P instrument can execute “First Trip” test.Both instruments display numerical and graphical results. Because of that, a user can easily overlay up to 4 records in the graphical form and make a quick on-site analysis of potential defects.A user can download test results to a PC via Bluetooth interface for more detailed analysis using DV Win software.
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LED Tester For Ultra High Power
Electrical Testing: Forward：VF、DVF、VFD、IF、DIF Reverse：VZ、DVZ、IR、DIR AC：VAC、IAC、WAC、PFOptical Testing: can test LOP in cd/mcd/W/mW/lm... from different optical components Wavelength λp,λd,λc,hw,purity,(x,y),CCT,CRIFour-wire measurement and contact resistance in case of deviation. Auto polarity identification and preheat function.Compatible mechanical interface.Optional ESD static test system.
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Single Slot 3 U PXI Reed Relay Matrix Module
40-540-021
The highest density single slot PXI reed relay matrix module on the market today. This range also includes a 33x16 and 66x8 reed relay matrices with 1-pole switching. They are constructed using high reliability sputtered ruthenium reed relays, offering >10e9 operations to give maximum switching confidence with long life and stable contact resistance. Typical applications include signal routing in Functional ATE and data acquisition systems.
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PXI-2585, 10‐Channel, 12 A, 1-Wire PXI Multiplexer Switch Module
778572-85
10‐Channel, 12 A, 1-Wire PXI Multiplexer Switch Module —The PXI‑2585 is a high‐power PXI multiplexer switch module that is ideal for switching power signals and loads in control applications and battery, power supply, and automotive testing. It is configured as a 10x1 multiplexer with both low contact resistance and high isolation voltage. It also features onboard relay counting for relay monitoring and deterministic operation with hardware triggers to improve test throughput.
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Large Earth Resistance Tester
WA 180
Wuhan Sangao Electrical Test Installations Limit Co.
WA180 Type Large earth resistance tester,To test substation earthing network(4Ω), Hydroelectric and Thermoelectric Power Plant,microwave(10Ω),lighting rod(10Ω)etc.Using new type variable frequency AC power supply, And adopts microcomputer control and signal processing measures, Solved the problem of interference of the testing process, To simplify the test procedure, To improve the precision and accuracy of the test results, reducing test personnel's the labor intensity and the cost of testing.The instrument can be used to test all kinds of power frequency earth resistance,contact voltage,step voltage etc frequency power parameters and soil resistivity. The instrument adopts the different frequency Anti-interference resistance technology, under strong interference environment accurately measured the frequency under 50Hz data.The maximum test current is 5A,it will not cause the earth device potential too high,and it also has strong anti interference ability, so it can be measured in the case of non power.
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PXI-2586, 10-Channel, 12 A, SPST PXI Relay Module
778572-86
10-Channel, 12 A, SPST PXI Relay Module—The PXI‑2586 is a general-purpose switch module that features independent single‑pole single‑throw (SPST) Form A armature relays. Each relay has low contact resistance and high isolation voltage. The PXI‑2586 is fully software programmable. It is rated for both high currents and high voltages, so it is ideal for switching power signals and loads in control applications and battery, power supply, and automotive testing.
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LARGE CURRENT 1000A PRIMARY CURRENT INJECTION TEST SET
TEST-901
Beijing GFUVE Electronics Co.,Ltd.
TEST-901 primary current injection test set adopts ARM Chip to control its output process and large capacity of toroidal transformers. It is equipped with LCD display and current meter; it can show primary current value, second current value, turn ratio and the action time. Packing is used as aluminum alloy body with PC panel. TEST-901 is mainly applied to CT turn ratio testing in the power system and contact resistance test which need large current.
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200A Digital Clamp Meter
7128A
Peaceful Thriving Enterprise Co Ltd
This is a auto-ranging, high accuracy and stable hand held clamp meter to make electrical maintenance safe and easy. With special designed IC to support true RMS, the meter is available to measure AC/DC voltage to 600V, AC current to 200A and resistance to 20MΩ; also having the capability to test diode, continuity and non contact voltage sensing. Sub switch included Function Select, Max-Min Indication, Value Hold, Range Select, Relative Value Measurement, Illumination and Back-light.
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600A Digital Clamp Meter
7128B
Peaceful Thriving Enterprise Co Ltd
This is a auto-ranging, high accuracy and stable hand held clamp meter to make electrical maintenance safe and easy. With special designed IC to support true RMS, the meter is available to measure AC/DC voltage to 600V, AC current to 600A and resistance to 60MΩ; also having the capability to test diode, continuity and non contact voltage sensing. Sub switch included Function Select, Max-Min Indication, Value Hold, Range Select, Relative Value Measurement, Inrush Current Indication, Illumination and Back-light.
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LXI Low Thermal EMF Matrix 1-pole 14x33
60-510-004
The 60-510 is a high density 1-pole matrix module controlled via LXI. It has excellent thermal stability and substantially reduced thermal EMF figures when compared to a conventional switching matrix. Typical applications include signal routing in ATE, selecting thermocouple inputs, switching amplifier gain circuits and high accuracy DC micro-volt measurements. Ruthenium reed switches are used because of their good low level switching capability. They also have a very long life with excellent contact resistance stability, minimal wetting current and low thermal offset. The 60-510 is designed in accordance with the LXI Standard 1.4 and is supplied in a 2U high, full rack width case with 500mm depth.
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10 Function True RMS Multimeter
Extech EX365
Extech Instruments Corporation
The EX365 is a Compact Industrial True RMS MultiMeter with a Built in Non Contact Voltage Detector. Featuring highly accurate True RMS measurements, LoZ for the prevention of false readings caused by ghost voltages, .5% basic accuracy, a 1000V AC/DC volt range, resistance up to 40MΩ, continuity beeper with visual alert, smart data hold, peak hold, auto power off with disable, relative mode for capacitance zero and offset adjustment. Additionally, the EX365 excels in frequency and capacitance measurements as well as commercial applications which require AC/DC current measurements from 1 mA to 10A. Complete with test leads, 9V battery, holster with tilt stand and built-in magnet.
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Back and Forth Scratching Tester
WGQ-60
Shanghai Dean Electrical Co., Ltd
Executive standard: NEMA、JIS; Inspection standard: JB/T4279.15-2008Used to detect the scraping resistance of coating and cable insulation layer of flat wires of 0.800～5.600mm (narrow side) and the silk and enamel covered round wires with nominal conductor diameter of 0.100～5.000mm;Application of SCM control allows for fast operation and strong anti-interference capacity;Sample support table allows for parallel rise and fall, maintaining close contact between the entire plane with sample;Scratching needle is vertical to the paint scraping direction and parallel with sample supporting table;When film is scratched and the action current is ≥5mA, painting scraper would automatically stop scraping;LED would automatically display the number of scraping.
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Underground Cable Fault Locator
KM-CFPL-620 /620B
Kusam Electrical Industries Limited
“KUSAM-MECO” underground Cable Fault Pre-locator is an automatic Cable Fault Locator which adopts ARM, FPGA & Dot Matrix Color LCD display Technology. This tester combines both pulse reflecting technology (TDR) & (intelligent Bridge testing (Bridge) (Model-KM-CFPL-620B) for measuring the exact fault location such as broken line, cross faults, earthing, (poor insulation & poor contact of the lead covered cables as well as plastic cables. (Model-KM-CFPL-620B)).It is a microprocessor based fault locator with a user friendly menu. It is easy to operate. It tests almost all telecom & signal cables. It has an English menu which is easy to understand & use. With Megameter & Ohmmeter it enables to test insulation resistance & loop resistance. It has USB Port for uploading test data to computer
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600A Digital Clamp Meter
7128C
Peaceful Thriving Enterprise Co Ltd
This is an auto-ranging, high accuracy and stable hand held clamp meter to make electrical maintenance safe and easy. With special designed IC to support true RMS, the meter is available to measure AC/DC voltage to 600V, AC/DC current to 600A and resistance to 60MΩ; also having the capability to test diode, continuity, frequency and non contact voltage sensing. Sub switch included Function Select, Value Hold, Range Select, Relative Value Measurement, Inrush Current Indication, Hz/Duty Cycle, Illumination and Back-light.
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Network Cable
Maximum speed 50 micron GOLD-PLATED contacts ensures the maximum speed is achieved through low resistance and signal degradation.Heavy Duty durability Lasts up to 10 times longer than other cables due to advanced protection against atmospheric corrosion and low friction.Network support CAT 5e cable will support Ethernet, Fast Ethernet, and Gigabit Ethernet. CAT 5e Cable is completely backwards compatible, and can be used in any application in which you would normally use CAT 5 cable.
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12 Function True RMS Professional MultiMeter + InfraRed Thermometer
Extech EX470A
Extech Instruments Corporation
The Extech EX470A True RMS Multimeter and Infrared Thermometer with Capacitance, Frequency, and Duty Cycle Measurements and 2 K-Type Remote Probes is the perfect meter for HVAC or plant maintenance. The IR thermometer measures the surface temperature from -4 to 518 °F (-20 to 270 °C) without contact. The built-in laser pointer centers the measuring area. Multimeter functions include AC and DC Voltage to 600 Volt, AC and DC current to 10A, resistance to 40MOhm, continuity and diode test. Also includes Type K thermometer for contact or air temperature measurements from -4 to 1832 °F (-20 to 750 °C). Advanced functions include Capacitance, Frequency and Duty Cycle. The meter comes complete with test leads, Type K temperature probe, 9 Volt battery, protective holster, adjustable tilt stand and Velcro hanging strap.
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Battery Impedance Meter
Operation is fast and simple. Just press the spring-loaded probes onto the two poles of the battery. After 1.5 seconds, the unit beeps (indicating good contact) and displays the battery voltage and either the number of siemens or milliohms, depending on the knob setting. The display continues to show these numbers after the probes are removed; it resets only when the probes are pressed onto the next battery. The impedance and voltage of any battery between 1.2 and 60 volts can be read. Because of the wide range of voltages, even single low-voltage cells, such as NiMH, can be measured. The manufacturers of some batteries specify impedance in milliohms while other specify in siemens (one divided by the resistance in ohms). This meter will display both types of impedance for any given battery. Accuracy is +/- 2% of the value.
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Milliohm Meter
16502
Chroma Systems Solutions, Inc.
Basic accuracy : 0.05%Pulsed test current output mode is used to reduce thermal EMFs affection on milliohm measurementDC test current output mode is used to fasten measurement speed for inductive DUTDry-circuit test current output mode (limited Max. 20mV) is used to measure such contact resistances where the maximum open-circuit voltage must be limited to 50mVTemperature correction (TC function) regardless of material or temperatureUseful temperature conversion function for motor/ coil evaluation4 channels R scan with balance check function for fan motor (combined with A165017 option)0.001mΩ~1.9999MΩ wide measurement range with 4½ digits resolutionStandard RS-232 interfaceOptional GPIB & Handler interfaceBin-sorting functionComparator and pass/fail alarming beeper functionLarge LCD display (240 x 64 dot-matrix)Friendly user interface
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11 Function True RMS Multimeter
Extech EX363
Extech Instruments Corporation
The EX363 is a Compact HVAC True RMS MultiMeter with a Built in Non Contact Voltage Detector. Featuring highly accurate True RMS measurements, LoZ for the prevention of false readings caused by ghost voltages, .5% basic accuracy, a 1000V AC/DC volt range, resistance up to 40MΩ, continuity beeper with visual alert, smart data hold, peak hold, auto power off with disable, relative mode for capacitance zero and offset adjustment. Additionally, the EX363 excels in HVAC flame rod measurements with a µA function, as well as Type K Temperature measurements from -40 to 742°F (-40 to 394°C) and Frequency and Capacitance measurements. Complete with test leads, 9V battery, holster with tilt stand, general purpose bead wire temperature probe and built-in magnet.
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PXI Single 32x8 Matrix, 1 Pole Switching
40-531-021
Model 40-531 very high density matrix modules are configured as a 32x8, while the 40-532 modules are configured as a Dual 16x8. Both modules are available in a choice of reed relay formats: 1-pole, 2-pole and 1-Pole screened. The screened version is suitable for switching coaxial signals up to 50MHz. Typical applications include signal routing in Functional ATE and data acquisition systems. These PXI matrix modules are constructed using high reliability Sputtered Ruthenium Reed Relays, offering 109 operations to give maximum switching confidence with long life and stable contact resistance.
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PXI Dual 16x8 Matrix, 1 Pole Switching
40-532-021
This high-density reed relay matrix with 256 crosspoints. This model is configured as a Dual 16x8, model 40-531 is configured as a 32x8. Both modules are available in a choice of reed relay formats: 1-pole, 2-pole and 1-Pole screened. The screened version can be used for switching coaxial signals up to 50MHz. Typical applications include signal routing in Functional ATE and data acquisition systems. These PXI matrix modules are constructed using high reliability Sputtered Ruthenium Reed Relays, offering 109 operations to give maximum switching confidence with long life and stable contact resistance.
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Micro-Ohmmeters
Contact resistance measurement is one of the most important and common tests during switchgear manufacturing, commissioning and maintenance stages. Besides switchgear testing, the RMO digital micro-ohmmeters are designed for simple, safe and efficient testing of:disconnecting switches,high-current bus bar joints,cable splices,welding joints,and different high-current links in factory and high-induction field environments.All DV Power RMO micro-ohmmeters use Kelvin’s 4-point measurement principle which is the most convenient for very small resistance measurements. The measurements are accurate and in accordance with international standards for AC high-voltage circuit breakers testing (IEEE C37.09 and IEC 62271-100).Starting from 2003, DV Power has been a trend-setter on the market when our first 500 A micro-ohmmeter weighing only 8 kg (RMO500A / CPM500) was released.Currently, DV Power products portfolio includes 16 models, divided into 3 series:13 portable models: RMO-A (6) and RMO-G (7) series.6 handheld models: RMO-H (6) seriesThe instruments generate a user-selectable and ripple-free test current up to 800 A in an automatically regulated test ramp. Test current ramping significantly decreases the influence of the magnetic transients to measurement.
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Harness Design and Manufacture
When designing an underwater cable harness, there are some factors which need to be considered, and we have produced the following list as a guide for customer information:Component considerations:- Electrical requirements- Mechanical considerations- Quality requirements- Reliability- Design redundancy (contact count)- Connector selection (type and form)- Locking requirements- Backpotting requirements- Waterblocking in moldings- Cable specification- Cable jacket material and compatibility with elastomers- Abrasion resistance- Stiffness profile at termination- Connector format (straight or right angle)- Molding format (straight or at an angle)- Clearance allowance for molding and cable routing- Elastomer compatibility (eg oil filled units)- Metalwork selection re: corrosion and cathodic delamination- Surface finish for metalwork as appropriateOperational considerations:- Operating depth profile (not just max. depth)- Tensile loads- Torsional loads- Bending loads- Bend control requirements (to limit bending at termination)- Deployment and recovery loads- Dynamic loading-Flow turbulence effects.
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11 Function True RMS Professional MultiMeter
Extech EX430A
Extech Instruments Corporation
The Extech EX430A True RMS Autoranging Multimeter (with K Type, Capacitance, Frequency, and Duty Cycle) is a professional grade True RMS multimeter capable of performing a wide range of measurements. Functions include AC and DC voltage to 600V, AC and DC current to 10A, resistance to 40MOhm, continuity and diode test. Also includes a Type K thermometer function for contact or air temperature measurements from -4 to 1832°F (-20 to 750°C). Advanced functions include Capacitance, Frequency and Duty Cycle. The meter comes complete with test leads, Type K temperature probe, 9V battery, protective holster, adjustable tilt stand and Velcro hanging strap.
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Three-Phase Transformer Winding Resistance Meters
TWA Advanced Series
TWA Advanced series is the latest DV Power solution for three-phase transformer winding resistance measurement and tap changer analysis. They are capable of testing six transformer windings with a single cable connection, as well as three-phase automatic transformer demagnetization. It has the option of the automated test mode, where the instrument operates the tap changer without operator input (minimizing the risk of human error) and records winding resistance results based on pre-selected stabilization criteria.The unique DVtest method of tap changer analysis enables checking the moving contacts of on-load tap changers during the transition, measuring the transition time, detecting open circuits, and many other types of faults. It is performed with 0.1 ms sampling rate, together with the measurement of tap changer motor current which detects motor and mechanical issues. A special proprietary algorithm is used for testing tap changers connected through a built-in series (booster) transformer. The DVtest can be performed either on one phase or simultaneously on three phases. It can also be performed together with the winding resistance test in all tap positions.A unique advantage of TWA Advanced instruments is the capability of simultaneously testing the winding resistance of all three phases of a three-phase transformer connected in a YN configuration. This can significantly speed up the testing– for example, it enables the operator to perform 33 measurements instead of 99 on a tap changer with 33 tap positions.TWA500 is equipped with a large 10.1” graphical touch-screen display, while TWA400 has a 7” graphical touch-screen display. Besides making the interface much more user-friendly compared to older winding ohmmeters, it also enables certain test options that were previously available only with DV-Win software. The most important among them are DVtest, tap changer motor current measurement, “Heat Run” test, test templates, and automatic test mode.
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PXI Dual 16x8 Matrix, 2 Pole Switching
40-532-022
This high-density reed relay matrix with 256 crosspoints. This model is configured as a Dual 16x8, model 40-531 is configured as a 32x8. Both modules are available in a choice of reed relay formats: 1-pole, 2-pole and 1-Pole screened. The screened version can be used for switching coaxial signals up to 50MHz. Typical applications include signal routing in Functional ATE and data acquisition systems. These PXI matrix modules are constructed using high reliability Sputtered Ruthenium Reed Relays, offering 109 operations to give maximum switching confidence with long life and stable contact resistance. Larger matrices may be constructed by Daisy Chaining the common signals from multiple PXI modules. For example, seven PXI modules will form a 224x8 Matrix, a total of 1792 crosspoints in a 7-slot PXI Chassis.
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Micro-ohmmeters
MMR-650
Designed to measure very low resistances of both resistive and inductive types of objects, including amorphous core transformers. This product is made to be used in power plants, railways and maintenance companies, to measure welded and soldered connections, equipotential bondings, earthing conductors, contacts, bolted connections, windings of motors and power transformers and other resistive and inductive objects. MMR-650 can be also utilized on a production lines (eg. at the final production control stage). An innovative combination of a high-performance measuring device with a modern user interface and advanced data management system. Wireless data transmission, enhanced system of 2D codes and ability to print labels to identify test items, all contribute to bringing new quality of work and allow the user to perform a wide range of measurements.
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PXI Single 32x8 Matrix, 2 Pole Switching
40-531-022
Model 40-531 very high density matrix modules are configured as a 32x8, while the 40-532 modules are configured as a Dual 16x8. Both modules are available in a choice of reed relay formats: 1-pole, 2-pole and 1-Pole screened. The screened version is suitable for switching coaxial signals up to 50MHz. Typical applications include signal routing in Functional ATE and data acquisition systems. These PXI matrix modules are constructed using high reliability Sputtered Ruthenium Reed Relays, offering 109 operations to give maximum switching confidence with long life and stable contact resistance. Larger matrices may be constructed by Daisy Chaining the common signals from multiple PXI modules. For example, seven PXI modules will form a 224x8 Matrix, a total of 1792 crosspoints in a 7-slot PXI Chassis.
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Three-Phase Transformer Winding Resistance Meters
TWA Standard Series
When it comes to winding resistance measurement on three-phase power transformers and autotransformers, TWA Standard series offers some of the most technically advanced instruments with LCD display in the market. Both models are capable of testing six transformer windings with a one-time cable connection, as well as three-phase automatic transformer demagnetization. The stored magnetic energy is safely automatically discharged at the end of the test. The built-in tap changer control unit enables automated test mode, where the instrument operates the tap changer without operator input and records winding resistance results based on pre-selected stabilization criteria. This option makes the operator’s job significantly easier.Both models can output test currents from 5 mA to 25 A DC for the purpose of winding resistance measurement. TWA40D has a special test mode for checking the synchronization of on-load tap changers with three phases simultaneously tested in parallel, in which the total test current can rise to up to 40 A DC.TWA40D has additional advantages when it comes to non-intrusive tap changer analysis. The unique DVtest method enables checking the moving contacts of on-load tap changers during the transition, measuring the transition time, detecting open circuits, and many other types of faults. It is performed with 0.1 ms sampling rate, simultaneously with the measurement of tap changer motor current which helps with the detection of motor and mechanical issues. A special proprietary algorithm is used for testing tap changers connected through a built-in series (booster) transformer. The DVtest can be performed either on one phase or on three phases simultaneously. It can also be performed as an additional test simultaneously with the winding resistance test in all tap positions.An additional unique advantage of TWA40D is the capability of simultaneously testing the winding resistance of all three phases of a three-phase transformer (connected in a YN configuration). This can significantly shorten the total testing time – for example, it enables the operator to perform 33 measurements instead of 99 on a tap changer with 33 tap positions.The test leads for TWA three-phase transformer winding ohmmeters are interchangeable with the TRT turns ratio testers, which means that both sets of tests can be performed with a single test lead connection to the power transformer terminals.
