Ohmmeters
measure the electrical resistance of a conductor.
See Also: Micro Ohmmeters, Teraohm Meters, Megohmmeters, Microhmmeters
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Low Resistance Ohmmeters
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Some times know as Ducter testers, these are highly accurate, easy to operate instruments that measure resistance with resolution as fine as 0.1 micro-ohm. Digital micro-ohmeters and DLROs measure contact resistance of switch and circuit breakers, aircraft frame bonds, and rail and pipeline bonds just to name a few of the applications. Megger has models available for testing using test currents from 0.5 mA to 200 amps covering a multitude of applications that require precise low-resistance measurements.
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Ohmmeters
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GAOTek provides state of the art, professional grade Ohmmeters for sale to the United States, Canada and Globally. GAOTek Ohmmeters are portable instruments that accurately measure electrical resistance between two points on a circuit. The Ohmmeters have their own power supply through their own battery, and are needed when the two probes (red: positive side of circuit, black: negative side of circuit) are connected to the two points in the circuit where the desired measurement is to take place. The circuit is turned off, which is when the ohmmeter sends its own current through the circuit. Units of Ohms, symbolized by the Greek letter Ω (Omega), are used as a unit of measure when measuring electrical resistance. In accordance with Ohm’s law, when the current is passing through a circuit is at its maximum, the resistance is said to be the smallest.
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Digital Micro Ohmmeters
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Our micro-processor controlled range of units offers the testing capability of up to 600 amps DC with 0.1μΩ resolution. Auto-ranging metering simultaneously displays all three parameters (mV, A, and μΩ).
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Portable Ohmmeters
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Our portable digital ohmmeters offer true portability without any sacrifice to accuracy or functionality. These ruggedly constructed instruments are ideal for use in the workshop, field or test facilities.
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Blue ESR/Low Ohms Meter
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This is the fully-assembled, cablibrated and tested Blue ESR/Low Ohms MeterThe latest and best Bob Parker design and successor to the famous Dick Smith ESR/Low Ohms Meter. This handy and affordable meter measures capacitor equivalent series resistance (ESR) in the circuit. ESR is a very important characteristic of capacitors greater than 1 ufd. This meter makes measurements which are often impossible to check with capacitance meters.
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Micro-Ohmmeters
RMO-G Series
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The RMO-G is a portable micro-ohmmeter designed for contact resistance measurement of non-inductive test objects and applications with increased safety requirement. It tests medium and high-voltage circuit breakers, disconnecting switches, high-current bus bar joints, cable splices, and different high-current links. Due to its Both Sides Grounded and Remote Control functionalities, the instrument accurately measures even in the most demanding environments, providing additional safety to testing personnel.The RMO800G is the most powerful portable micro-ohmmeter on the market with 800 A output current. RMO200G is our best seller in the USA. A user can choose the appropriate model depending on the output current requirement, from 100 A (RMO100G) to 800 A (RMO800G).We use an unbreakable plastic case with IP67 protective rating (with closed lid) for instruments’ housing. Although very portable and lightweight, RMO-G micro-ohmmeters have very high output power capabilities. High output voltage enables a wider measurement range at higher test currents. Consequently, it enables the usage of thinner/longer test cables. RMO-G generates a true DC ripple-free (less than 1 % ripple) current with automatically regulated test ramps. During the testing, it increases current before measuring and decreases current after the measurement. This significantly decreases magnetic transients and ensures great accuracy.Special current clamps measure a current through groundings when the instrument tests in Both Sides Grounded conditions. The instrument itself powers these clamps. If even higher safety level is required, the Remote Control feature enables the operator to perform measurements from distant locations.RMO-G instruments can store up to 500 measurements in internal memory. Also, they have a built-in thermal printer and USB flash drive available as an option. An additional option is the built-in High Precision module suitable for measurement of very low resistance, in the range from 1 to 30 µΩ, with 0,01 µΩ resolution.Our free DV Win software communicates with the RMO-G micro-ohmmeters via USB or RS232 interface. It allows a user to run the test remotely from a PC. Also, a user can download test results, analyze and generate fully configurable test reports through the software.
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Product
Micro Ohm Meter 10A
Micro Junior 2
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Raytech Digital Micro ohm meter, Micro Junior 2, was designed for high degree of accuracy to measure very low resistances. It is battery operated with a lithium-ion battery that allows over 2000 test measurements with 10A output without recharging.
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Micro-ohmmeters
MMR-650
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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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Resistance Measurement
PROMET
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High-precision micro-ohm measuring systems with adjustable DC test current for determining resistances on circuit breakers or inductive loads such as transformers, for example. The high-precision ohm meters of the PROMET series are used to determine very low electrical resistances in the µΩ range. The adjustable test current of up to 600 A in combination with a four-wire measuring method delivers measurement results which meet stringent accuracy requirements. State-of-the-art power electronics coupled with a robust design guarantee excellent reliability for use as a portable device in switching stations and industrial environments. Typical applications include determining the contact resistance of switchgear devices and determining the resistance on inductive loads such as transformers.
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Digital Micro Ohm Meter
PM-506
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Laxtronics Instruments & Controls Pvt. Ltd
1 Micro Ohm To 20 Kilo Ohms, Test Current 1 Ampere To 1 Micro Ampere.
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200 Ampere Micro OHM Meters
HL-200
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Measuring the line loop contact resistance by bridges is not the ideal method as the test current is only a few milli amperes. Thus the value is not the true value of the contact resistance. Model HL- 200 is a direct reading tester, and uses a test current of 200A DC, resulting in true value and accurate measurements. Model HL- 200 adopts digital circuit technique and is used for measuring contact resistance of switch control equipment at test current of 200A DC. The measurements are accurate as the test is highly stable. HL- 200 is a new, fully automatic micro controlled tester that measures contact resistance at 200A DC with built in printer.
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Precision Micro Ohmmeter
BS407
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High basic accuracy of 0.1%Wide range of 1 µΩ to 20 kΩCurrent reversal switch for detecting thermal EMF effectsCurrent diversion switch for easy zeroingFour terminal measurement using Kelvin clip leads (supplied)Battery operation with built-in charger20mV clamp for "dry circuit" testing
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OHMMETERS
DOT-1000-2
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Model DOT-1000-2, is an ac four-terminal ohmmeter to be used for the measurement of dynamic ac resistance of batteries, fuel cells and other voltage sources.
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POWER PROBE 4
PP401
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*Electronic circuit and component tester that supplies battery ground and power along with 8 diagnostic testing modes to provide automotive technicians with detailed information on the circuits and signals being tested*Diagnostic Modes include: AC/DC Voltmeter, Ohmmeter, Frequency, Pulse width (Positive and Negative) Fuel Injector Tester, PCM/ECM Driver Tester and PPECT3000 Signal tracer*Tests for AC/DC voltage in 100ms and 50s resolutions, AC volts RMS and volts peak-to-peak, measure resistance, frequency and pulse width (negative and positive)
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Bench-Mounted Ohmmeters
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The range of our bench-mounted ohmmeters are ideally suited for laboratory testing of samples and production line testing.
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Micro Ohm Meter 200A
Micro Centurion II
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Raytech Digital Micro ohm meter, Micro-Centurion II, was designed for high degree of accuracy to measure very low resistances. This technology was then packed into a portable test system to be used by apparatus manufacturers, rebuild shops, and electrical maintenance crews. This intelligent system has an easy to use operation screen, which allows quick selection of the current level and resistance level to be measured.
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Digital kV Meter
VM-10, VM-20 , VM-30
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UDEYRAJ ELECTRICALS PRIVATE LIMITED
High Voltage Meters measure AC and DC voltages of up to 30kV with high accuracy. The meter input impedance is as high as 1000 M ohm, making the meter suitable for measurement of voltages of high source impedance circuits. Meters are compact and light weight and can be conveniently used as a calibration meter.
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Low Ohm Meter / Distortion Meter
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Feature:*Auto range*Single/Repeating measuring*Four-terminal measuring*Percentage error three steps selectable*Dual display
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Antenna, Loop
EM-6871 | 30 Hz – 1 MHz
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The EM-6871 Antenna can be used with any 50 ohm /Receiver/Field Strength Meter to obtain magnetic field measurements from 30 Hz to 1 MHz.
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Low Resistance Ohm Meters
DMO-100D
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For fast and accurate measurements of low resistanceon Switch Contacts, SF-6 Switch Gear, Bushbars, Splices, Joints, Fuses, Breaker Contacts, and Rail Bonds. • 100A DC continuous current in 4 ranges of 10A, 20A, 50A and 100A
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TERA Ohmmeter
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Due to its compact design and battery operation, our TERA ohmmeters are ideally suited for mobile applications in industrial areas; They can also be in a stationary way through their mains connection. They are operated by only two buttons, are menu-driven and therefore very user-friendly. All settings are in the LCD display.
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Tap Changer Analyzers & Winding Ohmmeters
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Winding resistance test of inductive test objects, such as power transformers, is one of the most effective non-intrusive ways of checking its condition. Due to their advanced design, DV Power winding resistance meters provide high test currents (up to 100 A DC) and high accuracy (up to 0.1%) within light and portable test instruments. In addition to winding resistance measurement, it is also possible to perform simple, quick and reliable transformer on-load tap changer condition assessment by recording the test current during tap changer operation, also known as DVtest. Because of that, problems with a tap changer connection, contacts, and switching procedure can be detected.DV Power winding ohmmeters consist of single-phase RMO-T and three-phase TWA series. Models from the TWA series are designed for six-winding resistance measurement of power and distribution transformers, with only one single-step cable setup. As a result of reducing the total test time, it enables significant saving of time and money.Typical application areas of these instruments are high-voltage substations and industrial environments. They are intended to measure the resistance of:Transformer windingsOn-load tap changersGeneratorsElectrical motorsHigh-current bus bar jointsCable splicesWelding joints
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Motor Winding Ohmmeter
RMO-M Series
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The motor/generator winding resistance test is used to identify open windings, shorts between two windings, short to grounds, connection mistakes or shorted turns. This non-invasive test of winding resistance helps to pinpoint problems regarding windings in stator or rotor part of an electrical machine. Additionally, motor winding ohmmeter has the capability of performing heat run test which will show a change in windings resistance with an increase of temperature.The RMO-M series is designed as an ideal aid in preventive maintenance of electrical motors and generators. They are powerful (up to 100A of test current), portable (8 kg) and generate DC current which is completely ripple-free. This makes measurement very precise with 0,1% accuracy.Three voltage channels make measurement very easy since it is possible to obtain a value of all three winding resistances in one measurement
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Digital Micro OHM Meter
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NMC's Digital Micro Ohm Meters are low cost, compact, light weight, 3½ digit resistance meter suitable for measurements of resistances of cables, wires, transformers, motor windings, coils and contact resistance of switches, connectors, relays and track resistance of PCB's etc. The value of resistance is displayed on 7 segment LED display. Four terminal measurement systems provide measurements free from errors due to contact resistance and test lead resistance.
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Micro-Ohmmeters
RMO-A Series
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The RMO-A is a portable micro-ohmmeter designed for contact resistance measurements of switchgear during manufacturing, commissioning and maintenance stages. This micro-ohmmeter is widely used by medium and high-voltage circuit breakers manufacturers. Other typical applications are testing of disconnecting switches, high-current bus bar joints, cable splices, and different high-current links. It accurately measures not only in factory environments but also in high-induction fields and substationsThe RMO-A series contains 6 models, rated from 100 A (RMO100A) to 600 A (RMO600A). The RMO500A (formerly CPM500) is our best seller, with 500 A ripple-free current and weighs only 8 kg.Although placed in a very portable and lightweight metal housing, RMO-A micro-ohmmeters have very high output power capabilities. They can generate 600 A test current continuously for up to 20 s. You can test with current up to 100 A without rest time. High output voltage enables a wider measurement range at the highest test currents, as well as the use of thinner/longer test cables. For testing with 100 A, 20 m test leads can be provided with only 16 mm2 cross-section.RMO-A micro-ohmmeter generates a true DC ripple-free (less than 1 %) current with automatically regulated test ramps. During a test, the RMO-A ramps up with increasing current before measuring and decreasing current after the measurement. This significantly decreases magnetic transients and ensures great accuracy.An additional option is a built-in High Precision module suitable for measurement of very low resistances, ranges from 1 to 30 µΩ, with 0,01 µΩ resolution.These instruments can store up to 500 measurements in internal memory. A built-in thermal printer is available as an option.Our free DV Win software communicates with the RMO-A micro-ohmmeters via USB or RS232 interface. It allows you to run the test remotely from PC, as well as to download test results, analyze and generate fully configurable test reports.
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Micro-Ohmmeters
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Micro-Ohmmeter is an affordable 7 range, 4-Wire Kelvin based product that is used to test electrical resistance on a wide variety of applications including winding resistance, contact resistance, and component testing. The 720A micro-ohmmeter has an autorange feature (available with NSN package) and is compatible with an RS232C interface (OP-232). Thanks to its wide-range capabilities, ease of use, and CE mark, this micro-ohmmeter is used commonly across the globe.
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Micro-Ohmmeters
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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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Plant Auditor's Surface Resistance Kit
PMK-153
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The PMK-153 Resistance Test Kit contains the instruments you need to take resistance measurements.The PMK-153 includes the PAS-853B Wide Range Ohmmeter with 5 pound Conductive Rubber Electrodes. The PAS-853B instrument is a wide range ohmmeter that measures accurately from 0.01 to 9.9x1012 ohms. In AUTO mode the instrument automatically adjusts resistance range and selects test voltage in accordance with standard practices outlined in ANSI/ESD STM11.11, and meets audit requirements of ESD TR53.
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Transformer Resistance Testing
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Weshine Electric Manufacturing Co., Ltd
Transformer insulation resistance deterioration is one of the most common causes of transformer failure: a failing transformer is a costly replacement in an electrical system with the potential for a long downtime. If you fail to maintain your transformer with regular insulation resistance testing (as can be carried out by the WESHINE Transformer Ohmmeter (VS-3110 series) of transformer test equipment) then it’s likely to fail before reaching its maximum operating life.
