Microohmmeters / DLROs

The MMR-650 is a compact, portable microohmmeter for measuring very low resistances of resistive and inductive objects. This product is designed to measure welded and soldered connections, equipotential bondings, earthing conductors, contacts, bolted connections, windings of motors and power transformers, including amorphous core transformers. The MMR-650 can be also deployed on production lines in manufacturing industries. Its rugged enough for field work in power plants and maintenance yards, it comes with an IP54 rating, and will perform well in extreme temperatures (-10°C to 50°C). Sonel has made several design innovations with the MMR-650, it is a high-performance measuring device with a modern user interface, and advanced data management to store results. It can be connected to a PC or network via WIFI for creating reports. An optional printer can print labels to identify test items, or print results in the field.

Microprocessor controlled Alphanumerical display Resolution down to: 0.1 µΩ Resistance reading up to: 200 Ω Up to 100 A test current Kelvin-type (4 wires) measurement Powered by internal battery (up to 10 A) or mains supply Direct reading (up to 4½ digits) Overheating protection Serial data output (USB) > The MPK102e high current micro-ohmmeter is a portable, microprocessor-controlled instrument, used to accurately measure very low contact resistances of breakers and switches, busbars, transformers winding and engines, etc, with test currents from 1 mA to 100 A. It employs the 4 terminals-method to avoid measurement errors caused by test leads and their contact resistances. Resistances readings are shown in the alphanumeric display with up to 4½ digits-resolution. It allows to measure resistances up to 200 Ω, with a resolution of up to 0.1 µΩ. Using its internal rechargeable battery, measurements with up to 10 A test current may be carried out without connecting the equipment to mains supply. Powered by mains supply, it allows to measure with any test current up to 100 A. Measurement accuracy is guaranteed by an state-of-the-art signals amplification system, offset-free and of high long-term stability. Test current may be adjusted by the operator in every one of the ranges and their values are measured using an analog indicator (bargraph), making it easy to measure resistances with a significant inductive component, as in the case of big transformers windings. The high-current generation system is based on modern technology that allows to significantly decrease both its weight (30.86 lb | 14 kg) and size. The cabinet is made of plastic material highly resistant to impacts and to environmental challenges. Internal thermal sensors in all sensitive components avoid any damaged caused to the instrument due to overheating. This is a strong but lightweight equipment and may be easily carried by one person. It is water-resistant and can be used under severe weather conditions offering an excellent performance working both in the laboratory and out in the field.

Microprocessor controlled Alphanumerical display Resolution down to: 0.1 µΩ Resistance reading up to: 200 Ω Up to 200 A test current Kelvin-type (4 wires) measurement Powered by internal battery (up to 10 A) or mains supply Direct reading (up to 4½ digits) Overheating protection Serial data output (USB) > The MPK204e high current micro-ohmmeter is a portable, microprocessor-controlled instrument, used to accurately measure very low contact resistances of breakers and switches, busbars, transformers winding and engines, etc, with test currents from 1 mA to 200 A. It employs the 4 terminals-method to avoid measurement errors caused by test leads and their contact resistances. Resistances readings are shown in the alphanumeric display with up to 4½ digits-resolution. It allows to measure resistances up to 200 Ω, with a resolution of up to 0.1 µΩ. Using its internal rechargeable battery, measurements with up to 10 A test current may be carried out without connecting the equipment to mains supply. Powered by mains supply, it allows to measure with any test current up to 200 A. Measurement accuracy is guaranteed by an state-of-the-art signals amplification system, offset-free and of high long-term stability. Test current may be adjusted by the operator in every one of the ranges and their values are measured using an analog indicator (bargraph), making it easy to measure resistances with a significant inductive component, as in the case of big transformers windings. The high-current generation system is based on modern technology that allows to significantly decrease both its weight (35.27 lb | 16 kg) and size. The cabinet is made of plastic material highly resistant to impacts and to environmental challenges. Internal thermal sensors in all sensitive components avoid any damaged caused to the instrument due to overheating. This is a strong but lightweight equipment and may be easily carried by one person. It is water-resistant and can be used under severe weather conditions offering an excellent performance working both in the laboratory and out in the field.

Micro-ohmmeter up to 200 A Performs 30 consecutives 1-minute measurements with 1 minute interval between them Alphanumerical display Direct reading (up to 4½ digits) Resolution: 0.1 μΩ Resistance reading: up to 1 Ω U/I (4-wires) measurement Overheating protection Internal memory for up to 50 registers with 80 readings each > The MPK215e is a portable, microprocessor controlled instrument, used to accurately measure very low contact resistances of breakers and switches, busbars, transformers winding and engines, etc, with test currents from 5 A to 200 A. It employs the 4 terminals-method to avoid measurement errors caused by test leads and their contact resistances. Resistances readings are shown in the alphanumeric display with up to 4½ digits-resolution. It allows to measure resistances up to 1 Ω, with a resolution of up to 0.1 μΩ. Measurement accuracy is guaranteed by an state-of-the-art signal amplification system, offset-free and of high long-term stability Test current may be adjusted by the operator in every one of the ranges and their values are measured using an analog indicator (bargraph), making it easy to measure resistances with a significant inductive component, as in the case of big transformers windings. The high-current generation system is based on modern technology that allows to significantly decrease both its weight and size. The cabinet is made of plastic material highly resistant to impacts and to environmental challenges. Internal thermal sensors in all sensitive components avoid any damaged caused to the instrument due to overheating. This is a strong but lightweight equipment and may be easily carried by one person. It is water-resistant and can be used under severe weather conditions offering an excellent performance working both in the laboratory and out in the field.

Microprocessor controlled Alphanumerical display Direct reading (up to 4½ digits) Resolution: 1 μΩ Resistance reading: up to 2000 Ω 0.1 % basic accuracy U/I (4-wires) measurement USB Data output Rechargeable battery Remote control through an Android™ app > The MPK-256 digital very low resistance ohmmeter is a portable, microprocessor-controlled instrument used to accurately measure resistances of switches and circuit breaker contacts, transformer and motor windings, wire and cable samples, joints in busbars, etc., using test currents from 1mA up to 10 A. It uses the Kelvin-type, four-terminals measurement principle, thus eliminating errors caused by lead and contact resistances. Resistance readings are shown in the alphanumeric display with up to a 4½ digit-resolution. It allows to measure resistances of up to 2,000 Ω, with a resolution down to 1 µΩ. Measurements accuracy is guaranteed by the state-of-the-art system for signal amplification, offset-free and with long-term stability.The equipment has a USB interface that allows to download the measured values to a computer for their later analysis. The open circuit output voltage is of up to 10 V, depending on the selected test current, reducing the stabilization time for the test current when highly inductive elements are measured. The measurement circuit has an effective protection against voltage peaks originated by those inductances. Operation is very simple: Just connect the leads, switch-on the equipment, select the test current and press the start button. After a few seconds (depending on inductance of the element), direct reading appears on the display with the measure unit indication (Ω, mΩ or µΩ). If it is necessary, the display will show messages to help the operator (Low battery, Over range, etc). The equipment is housed in a rugged plastic case with a hinged lid and carrying handle. It is a portable, strong, impact resistant and lightweight equipment, suitable to be used in field, under severe weather conditions. It supplies very reliable and accurate measurements both in laboratory and out in the field.

Microprocessor controlled Alphanumerical display Direct reading (up to 4½ digits) Resolution: 0.1 μΩ Resistance reading: up to 2000 Ω 0.1 % basic accuracy U/I (4-wires) measurement USB Data output Rechargeable battery > The MPK-257 digital very low resistance ohmmeter is a portable, microprocessor-controlled instrument used to accurately measure resistances of switches and circuit breaker contacts, transformer and motor windings, wire and cable samples, joints in busbars, etc., using test currents from 1mA up to 10 A. It uses the Kelvin-type, four-terminals measurement principle, thus eliminating errors caused by lead and contact resistances. Resistance readings are shown in the alphanumeric display with up to a 4½ digit-resolution. It allows to measure resistances of up to 2,000 Ω, with a resolution down to 0.1 µΩ. Measurements accuracy is guaranteed by the state-of-the-art system for signal amplification, offset-free and with long-term stability.The equipment has a USB interface that allows to download the measured values to a computer for their later analysis. The open circuit output voltage is of up to 10 V, depending on the selected test current, reducing the stabilization time for the test current when highly inductive elements are measured. The measurement circuit has an effective protection against voltage peaks originated by those inductances. Operation is very simple: Just connect the leads, switch-on the equipment, select the test current and press the start button. After a few seconds (depending on inductance of the element), direct reading appears on the display with the measure unit indication (Ω, mΩ or µΩ). If it is necessary, the display will show messages to help the operator (Low battery, Over range, etc). The equipment is housed in a rugged plastic case with a hinged lid and carrying handle. It is a portable, strong, impact resistant and lightweight equipment, suitable to be used in field, under severe weather conditions. It supplies very reliable and accurate measurements both in laboratory and out in the field.