Precautions for operating DC resistance tester

DC resistance tester is a commonly used precision instrument in electrical testing. To ensure measurement accuracy and operational safety, the following operating specifications must be strictly followed:

1. Safety regulations

① Environmental requirements

Avoid harsh environments: Do not use in rainy, humid, corrosive gas or high temperature environments to prevent instrument short circuits or component damage.

Stay away from flammable and explosive materials: prevent sparks from causing fires or explosions during the testing process.

② Instrument inspection

Appearance inspection: Before use, check whether the shell, buttons, power cord, and test wire are damaged to ensure there is no risk of leakage.

Grounding protection: Confirm that the instrument is well grounded to prevent static electricity accumulation and electromagnetic interference.

③ Discharge operation

After the inductive load test: After turning off the output, wait for the discharge indication to complete (usually for more than 30 seconds) before removing the test line to avoid injury or damage to the equipment caused by inductive discharge.

No load tap changer transformer: It is strictly prohibited to switch the tap changer during the testing process. Before switching, it is necessary to reset and wait for the discharge to complete.

④ Personnel protection

Wear protective equipment: Wear insulated gloves and shoes during operation to reduce the risk of electric shock.

2. Measurement steps

① Preparation before measurement

Confirm power supply: Check that the power supply voltage is AC220V ± 10%, 50Hz.

Disconnect the tested equipment: Ensure that the tested equipment is powered off and isolated from other live devices.

② Parameter settings

Choose the appropriate range: Select the range based on the estimated value of the measured resistance to avoid errors caused by over range or under range.

Set test current: Select the current gear based on the technical specifications, and high current is required for large capacity transformers.

③ Connect the test line

Secure contact: Connect the test wire reliably to both ends of the tested resistor to avoid poor contact.

Four terminal method: Four terminal wiring is used for high-precision measurement to eliminate the influence of lead resistance.

④ Perform measurement

Start testing: Press the “start stop” button, the instrument applies current and displays the resistance value.

Record data: Record the results after the values have stabilized, paying attention to the unit (Ω or m Ω).

⑤ Operation after measurement

Turn off power: After the test is completed, turn off the instrument power first.

Waiting for discharge: Inductive loads need to wait for discharge to complete before disconnecting the wires.

Organize equipment: store test lines to avoid entanglement or damage.

3. Common problem solving

① The instrument has no display

Check the power supply: Confirm that the socket fuse is not blown and the power cord is not damaged.

Internal malfunction: If the plug-in is loose or the computer board is faulty, it needs to be returned to the factory for repair.

② Unable to measure the resistance value

Power failure: Replace the damaged power module.

Over range: Restart the instrument and select a smaller range or higher current gear.

③ Instrument flower screen

Loose wiring: After shutting down, check the internal wiring and reinforce it.

Electromagnetic interference: Contact the manufacturer to add filtering capacitors.

4. Equipment maintenance

Regular calibration: Conduct calibration once a year to ensure measurement accuracy.

Cleaning and maintenance: Keep the instrument dry and clean, avoid moisture or oil stains.

Professional maintenance: When there is a malfunction, it should be repaired by a professional engineer and should not be disassembled by oneself.

summarize

Following the above operating procedures can ensure the safety and measurement accuracy of the DC resistance tester. In fields such as power and electronic manufacturing, proper use of instruments can efficiently detect equipment status and prevent potential failures.

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Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com