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Resistance
that which keeps current from flowing freely.
See Also: Resistivity, Resistance Standards, Resistance Meters, Resistance Test, 4-wire
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Test Blocks & Plugs
PK-2
Type PK-2 test blocks are essentially 4-pole and 6-pole jacks, provided with molded Textolite covers that have internal plug contacts, which make a through connection when the cover is in place. The contacts in the blocks are of the line-pressure type and provide positive contact with minimum contact resistance.
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Thermal Software
ThetaCalc
Thermal Engineering Associates, Inc.
A tool designed to provide a quick estimate of the temperature and thermal resistance from a heat source to a reference heat sink. It also shows the temperature and thermal resistance value of each layer in the heat flow path. The program can accomodate up to ten layers of different materials of varying dimensions between the heat source and sink. The heat spreading angle can be set independently for each layer to a value between 0 and 45 degrees; the tool will automatically determine if heat flow reaches the layer edge and then convert to columnar flow.
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Three Phase Load Bank
REOLOAD 310
A three phase load bank rated for 48kW, with fan cooling. The front panel layout includes a switch panel for configuring the separate resistor modules to give the required resistance and current range. There are also digital panel meters for displaying the phase voltages and currents. An interface for PLC control is also provided.
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Time, Current, And Resistance Meter
AllWin Instrument Science and Technology Co., Ltd.
1. Time, current and resistance can be displayed simultaneously2. Out put current:5~30A. Ground resistance range: 50~600 mohm
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Time Domain Reflectometer
STEP TDRS
Cable Measurements: Distance, Fault Types, Distance to Faults, Impedance Readings, and Loop Resistance.
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Toe Compression Tester
UI-FT03
Safety Shoe Toe Cap Compression is to test toe cap compression resistance ability.
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Toy Flammability Tester
TT200
TESTEX Testing Equipment Systems Ltd.
Toy Flammability Tester, to determine flammability resistance of finery or toy and children clothing, the toy flammability tester mainly for evaluating the burning speed and time of the following kinds of toys or children stuff.
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Transformer Test Equipment
DV Power test instruments perform various diagnostic tests on power and instrument transformers. Even more, a unique feature is a condition assessment of on-load tap changers. Performing a transformer test before their breakage can be crucial.Test instruments are portable and enclosed in durable metal cases. Also, the 19” rack-mounted version suitable for factories is available as well.Applications supported by DV Power transformer test equipment include:Winding resistance measurement (IEC 60076-1)Analysis of on-load tap changers (IEC 60214-1)Heat run test (IEC 60076-2)Automatic transformer demagnetizationTurns ratio measurement of power and instrument transformers (IEC 60076-1)Excitation current measurementPhase angle measurementTransformer vector group detectionDemagnetization status verificationAll of the above-mentioned measurements are performed with the highest accuracy.The advanced DV-Win PC software collects both numerical and graphical results. As a result of that, these features provide an easier and more efficient analysis. After the test, DV-Win software generates a test report with a single click. Furthermore, a user can easily customize the test report and save it in different formats, such as XLS or PDF.Finally, the analysis of on-load tap changers is performed by the new method called dynamic resistance measurement (DRM). This is a non-intrusive method. Therefore, it allows detecting problems in on-load tap changers without disassembling them.
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Transformer Winding Resistance Meter
10A
*10A DC continuous current in 4 ranges of 0.01A, 0.1A, 1A and 10A.*4 ½ digit display for higher resolution.*Dual channel measurement.*Suitable for operation in energized switchyard conditions.*Specialized protection circuits for suppression of inductive voltage kickback.*SMPS based - lightweight and portable.
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Transformer Winding Resistance Meters
RMO TT Series
The Tap Changer Analyzer & Winding Ohmmeter of the RMO-TT series is designed for winding resistance measurement of inductive objects, and for a tap changer analysis. The RMO-TT series is based on the state of the art technology, using the most advanced switch mode technology available today. The RMO-TT instruments are accurate (0,1%), powerful (up to 100 A) and still portable. The Instruments generate a true DC ripple free current with automatically regulated measurement and discharging circuit. RMO-TT instruments can perform a simple, quick and reliable transformer on-load tap changer condition assessment. This series of instruments enable measurements of a winding resistance in every tap position, current ripple values (percentage of a current drop during a tap change) and transition times during the tap changes. Problems with a connection, contacts, and selector/diverter switch operation (tap change with interruption) can be detected with these measurements.
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Transformer Winding Resistance Meters
Vanguard Instruments Company, Inc.
The TRM-40 is Vanguard Instruments’ third generation transformer winding resistance meter. The TRM-40 is designed specifically to measure DC resistance values of transformer windings, rotating machine windings, or any dc resistance of an inductive device.
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Transformer Winding Resistance Meters
RMO TD Series
The RMO-TD Series On-Load Tap & Winding Resistance Analyzer is designed for the measurement of winding resistance of inductive elements, and for tap changer analysis. The RMO-TD series is based on the latest technology, using the most advanced switching technology available today. The RMO-TD series is accurate (0.1%), powerful (up to 60 A) and lightweight. It generates true, ripple-free DC current with automatic metering control and a discharge circuit.
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Transformer Winding Resistance Meters
RMO TW Series
The RMO-TW instrument can perform a simple, fast and reliable verification of a transformer on-load tap changer. This instrument allows measurements of a winding resistance at each tapping position of an on-load tap changer without discharging between tests. Problems with OLTC switching, such as interruption, can be detected with these measurements. The results are displayed on a backlit LCD screen.
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Trimmer Potentiometers
CTS trimmers are typically used in applications that do not need frequent adjustment and are often used for "set and forget" initial adjustments in circuits. These are usually located on the circuit board and out of view. CTS trimmers are available in a variety of standard resistance values, tolerances, power ratings, and mounting styles. Depending on product series, adjustment knobs are available with color coding and a screwdriver and/or hex hole for top or bottom side adjustments.
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Trip Amplifiers
Datexel manufacture a large range of Trip Amplifiers and Process Limit Alarms that accept universal inputs and provide either relays or NPN or PNP transistor outputs. The DAT5028 is also an isolated signal converter and has a local display with up to 4 relays and is DIP switch programmable. The inputs can be Thermocouples, RTD, mV, mA, Resistance, Potentiometers or Voltage. They can be supplied fully configured set up by PC or DIP switches. The DAT5024 is a trip Amplifier / Temperature limit alarm for RTD's, Thermocouples, Voltage, Resistance and Current with the option of 1 or 2 relay outputs hysteresis and delay timers. The DAT5024 E range is an economical choice with DIP Switch programmable for voltage or current input. Either 1 relay or 2 relays (SPDT) are available with delay timers.
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Trms Digital Multimeter
HH2205D
Measure Resistance up to 40M ohm. Measure Temperature up to 300oC or 572oF. Measure Frequency up to 400k Hz. Measure Capacitance up to 100uF. Transistor test
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Two-Pole Voltage Tester
P-5
SONEL P-5 has all the features that characterize the P-4 Voltage Tester. In addition, the P-5 model has the ability to take resistance measurements up to 2 kΩ and has an LCD display that allows you to display the voltage and resistance values accurately.
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Ultra-High Resistance Scanner
Ultra-High Resistance Scanner is the only Scanner capable of operating with measurements to 10 PΩ’s (1015) and at voltages to 1000 Vdc. The 6564 has world-leading isolation of 1017 with repeatable offsets above this resistance. Researchers and Metrologists can now easily and quickly automate single or multiple resistance measurements.
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Ultra sensitive heat flux plate
HFP03
Hukseflux Thermal Sensors B.V.
HFP03 is an ultra sensitive sensor for heatflux measurement of small heat fluxes through soil, walls and building envelopes. By using a ceramics-plastic composite body the total thermal resistance is kept small.
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Universal Transmitter
Knick Elektronische Messgeräte GmbH & Co. KG.
Universal Transmitter for temperature, load cells / strain gauge, potentiometer and resistance in 6 mm housing. Functional safety up to SIL 2, SIL 3 redundant to parameterization via interface or intuitively, directly on the device. Universal use with 24 V DC or AC power supply.
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Variable Resistors/Potentiometers
When a design calls for a variable resistance, CTS can supply a solution in the form of a wide variety of rotary and slide-action variable resistors / potentiometers. Our rotary potentiometers are available in various sizes ranging from 9mm square to 24mm in diameter, while slide-action potentiometers are available with travel from 10 to 60 mm. CTS rotary potentiometers can be constructed using conductive plastic, traditional carbon, or wire-wound elements. Our conductive-plastic potentiometers feature a standard 2% linearity and 2 million life cycles with a standard resistance tolerance of 10%. Our conductive-plastic rotary potentiometers handle as much as 0.25 W power in operating temperatures of -40 to +125C. CTS wire-wound rotary potentiometers offer standard linearity of 3% with 2% available upon request, and a resistance tolerance down to 5%. Our wire-wound rotary potentiometers come with a 5 Watt power rating in operating temperatures of -30 to +105C. Standard wire-wound rotary potentiometers are designed for 10,000 life cycles, although models built for 50,000 and 100,000 cycles are available upon request. For those in need of slide-action potentiometers, we offer a range of carbon composition pots with standard features such as 10,000 life cycles, linear and audio resistance tapers, and available with tolerance of 10%.
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VBR Load Analyzer
The Powerohm Variable Braking Resistor Analyzer will determine what braking resistor ratings are required for your specific application. The Powerohm VBR is a portable test unit that provides selectable steps of resistance for analyzing your braking requirements for a wide range of drive horsepowers. Simply connect the VBR to your drive or braking module and let the application decide what braking resistor it needs. Once you determine the optimal resistance value for your drives peak performance, the VBR's digital readout will accurately display the true duty cycle as the application runs.
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VCOs with Output Dividers
Analog Devices offers a range of GaAs inGaP heterojunction bipolar transistor (HBT) MMIC VCOs with output divider options to meet your application and design needs. Members of this product line integrate resonators, negative resistance devices, and varactor diodes, while featuring excellent phase noise performance.
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Viscosity-Rotational
The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. For liquids, it corresponds to the informal notion of "thickness". A liquid whose viscosity is less than that of water is sometimes known as a mobile liquid, while a substance with a viscosity substantially greater than water is called a viscous liquid.
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Volume and Surface Resistivity
Volume resistivity represents an insulating material’s resistance to leakage current through its body. It calculates the ratio of the potential gradient in relation to the current in a material with the same density. A direct-current resistance between opposing faces of a one-meter cube of the material numerically equates to volume resistivity in SI (Ohm-m).
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Water Cooled Active Resistance DC Electronic Load
WRx Series
Utilizing Magna-Power’s new patent pending Active Resistance Technology in combination with the company’s internally manufactured microchannel water-cooled heatsinks, the WRx Series addresses high power DC applications where exhaust heat control is essential. The WRx Series greatly increases power density compared air-cooled alternatives. An integrated solenoid controls the flow of water to avoid condensation. Full power can be achieved using conventional water, with water inlet temperatures up to 25 °C.
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Weld Force Gauges
This system is ideal for field measurement and data logging of forces between the tips of resistance spot welders.
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Welding Simulator
High-speed, direct resistance heating up to 10,000C/secondControlled cooling or accelerated cooling with optional quench (air/gas/water/mist)Simulation of multiple welding techniques and materialsAbility to test in vacuum, air or inert gasEasy to use controls and software, including DSI's custom Gleeble Welding Software
