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Quality service
We offer our customers several practical, efficient and cost effective solutions for their business or projects' test equipment needs.
Well appointed
We stock a comprehensive inventory of equipment and can use our extensive network to find you those hard to get items.
Rich experience
We have more than years of industry experience and a team of experienced engineers and technicians to ensure consistent precision and high quality of our products.
Professional team
The company is in possession of numbers of senior engineers and has abundant technique power, well conditioned equipment and technology comes to perfection.
Advantages of Resistance Meter
Detecting Electrical Defects
Resistance meters can detect electrical defects, such as shorts, open circuits, and poor connections, by measuring the resistance of electrical components and cables. They help pinpoint the location of faults in circuits, allowing for efficient troubleshooting and repairs.
Accurate Resistance Measurement
Resistance meters, especially digital multimeters (DMMs), provide accurate and precise resistance readings. They can be used to measure contact resistance in connectors, relays, and switchgear, ensuring reliable connections.
Versatility
Multimeters can measure not only resistance but also voltage, current, and capacitance, making them versatile tools for various electrical tasks. Resistance meters are used in diverse applications, from simple home repairs to complex circuit diagnostics in industrial settings.
Components
Resistors, inductors and chokes all have to verify that their product meets the specified resistance tolerance, end of production line and quality control testing.
Switches, relays & connectors
Verification that the contact resistance is below pre specified limits is required. This can be achieved at end of production line testing, ensuring quality control.
Cable
Must measure the resistance of the copper wires they produce, resistance too high means that the current carrying capability of the cable is reduced; resistance too low means that the manufacturer is being too generous on the cable diameter using more copper than he needs to, which can be very expensive.
Electric motor & generator
There is a requirement to determine the maximum temperature reached under full load. To determine this temperature, the temperature coefficient of the copper winding is used. From the change in resistance value, the internal motor/generator temperature can be determined.
The automotive industry
Requirement to measure the resistance of robot welding cables to ensure that the weld quality does not deteriorate, i.e. battery lead crimp connectors, air bag detonator resistance, resistance of wiring harness, and quality of crimp connectors on components.
Fuse
For quality control, resistance bonding measurements on aircraft and military vehicles, it is necessary to ensure that all equipment installed in aircraft is electrically connected to the air frame, including galley equipment. Tanks and other military vehicles have the same requirements. Producers and users of large electrical currents all need to measure distribution of joint resistance, busbars, and connectors to electrodes for electroplating.
Railway utilities
Including trams and underground railways (Metro) - for the measurement of power distribution cable joints, including the resistance of rail track joints, because the rails are often used for signalling information.
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Measurement resolution |
6½ digits |
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Current measurement |
0.01 fA - 20 mA |
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Minimum range |
2 pA |
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Resistance measurement |
Up to 10 PΩ |
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Voltage measurement |
1 µV - 20 V |
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Input resistance |
> 200 TΩ |
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Charge measurement |
1 fC - 2 µC |
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Voltage source |
Up to ± 1,000 V |
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Minimum resolution |
700 µV |
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Maximum reading rate |
20,000 rdg/s |
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Voltage range |
2 V |
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Display resolution |
1 µV |
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Accuracy ±(% + offset) |
0.025 + 40 µV |
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Voltage range |
20 V |
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Display resolution |
10 µV |
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Accuracy ±(% + offset) |
0.025 + 400 µV |
|
Input bias current |
< 20 fa |
|
Input impedance |
> 200 TΩ, parallel with < 20 pF (non-guarded) or < 2 pF (guarded) |
|
RMS noise |
1.4 µV for 2 V range, 10 s duration, shorted input |
Resistance Measurement Procedures
Follow the steps below to measure resistance:
●Before testing begins the technician should always know what reading to expect based on the manufactures specifications, name plate rating, Ohms’s law and Kirchhoffs law. Testing blindly is dangerous and counterproductive.
●Turn off the power and prove the circuit to be measured is “dead” using the T3 testing method and the voltage measuring procedures. Be sure to wear your PPE as we always assume a circuit is “live” until proven otherwise
●Remove or isolate the component to be tested.
●Plug the test probes into the appropriate probe jacks, Common and Ω. Note that the jacks used may be the same ones used to measure volts.
●Select the ohms function by turning the function switch to ohms. Start with the lowest setting.
●Touch the probes together to check the leads, connections and battery life. The meter should display zero or a very small amount of resistance for the test leads. With the leads apart, the meter should display OL or I, depending on the manufacturer.
●Connect the tips of the probes across the break in the component or portion of the circuit for which you want to determine resistance. If you get an OL (over limit), switch to the next highest setting.
●View the reading on the display unit. Be sure to note the unit of measurement.
●Turn the meter off when testing is complete to prolong battery life.
As one of the leading resistance manufacturers and suppliers in China, we warmly welcome you to buy high-grade resistance in stock here from our factory. All our products are with high quality and competitive price. For more information, contact us now.
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