Dual Canopy Mechanic Electrical Engineering Co., Ltd. is one of the leading manufacturers and suppliers of DC Resistance Test Instrument in China. Please feel free to wholesale discount products for sale here and get quotation from our factory. Customized orders are welcome.
What is DC Resistance Test Instrument?
The DC Resistance Test Instrument is a portable DC resistance measuring instrument designed for power system maintenance and on-site acceptance testing. It measures the DC resistance of low-resistance circuits and outputs traceable records. Typical applications include: checking transformer winding resistance consistency, evaluating circuit breaker contact resistance, verifying busbar connection quality, and inspecting cable joint crimping processes.
This device is the go-to tool for preventative maintenance teams, field service engineers, and utility inspection crews who need to perform quick "go/no-go" assessments or trend analyses without the hassle of transporting heavy equipment or locating AC power sources in remote locations.
What safety precautions are in place?
Multiple Protections, More Reliable Operation
The protection mechanism is comprehensive and robust, featuring strong back EMF impact protection. It effectively resists damage to the instrument's core components from back EMF during testing, significantly improving equipment operational stability and service life. It also features a discharge alarm function and clear discharge status indicators, providing real-time feedback on the equipment's discharge progress and rapid response to operation commands, effectively avoiding safety risks caused by misoperation and ensuring the safety of personnel and equipment.
What are the key points for using it?
1. Confirm Power Deactivation and Isolation: The circuit under test must be disconnected from the operating power supply and tested for voltage/grounding according to regulations.
2. Select Measurement Mode and Current Range: The recommended current range for windings and contacts/busbars is usually different.
3. Four-Wire Connection Arrangement: The current clamp and sampling clamp should be as close as possible to the same measurement point to avoid "sampling point offset".
4. Wait for Stabilization Before Reading: For inductive loads such as windings/motors, wait for the reading to enter the stable range before recording.
5. Release Energy as Promptly After Completion: For inductive objects, ensure that the discharge/energy release steps are completed before disconnecting the wires.
6. Save Records and Note Conditions: Record the tap position, phase, ambient/winding temperature, and clamp position to ensure comparability.
Our address
Baoding Cloud Center, Hebei, China
Phone Number
+86 13483219412
Salesm@dualcanopy.com
FAQ
Q1. Why does the reading take longer to stabilize on inductive loads?
A: Transformer windings and other inductive components behave as RL circuits. When DC current is applied, the current rises exponentially based on the time constant τ = L/R . Large power transformers have high inductance (L), causing long charging times that can range from several minutes to tens of minutes before the current stabilizes and an accurate resistance reading can be taken . This is inherent to inductive load testing.
Q2. Does the meter support temperature compensation or temperature input?
A: Yes. The tester includes a resistance temperature conversion function and can be equipped with a wireless temperature measurement module to measure ambient or winding temperature in real time . This ensures that measured resistance values can be corrected to a reference temperature (e.g., 20°C or 75°C), enabling comparison against nameplate values and historical data.
Q3. Can test results be stored and exported for reports?
A: Yes. The instrument features internal memory for storing test records and supports data export via USB or wireless communication . Exported data can be saved as CSV or TXT files, which are compatible with PC software for report generation and acceptance documentation
Hot Tags: DC Resistance Test Instrument, China DC Resistance Test Instrument manufacturers, suppliers, factory, transformer dc resistance analyser, transformer dc resistance analyzer, DC handheld resistance tester, 3102Transformer DC Resistance Tester, dc low resistance analyser, DC Winding Resistance Test kit
