Zd1C Contact Resistance Tester
As distribution networks carry heavier loads, the risk of overheating at electrical connections becomes increasingly important to manage. Regular contact-resistance checks help identify developing
ZD1C Contact Resistance Tester
Contact Resistance Testing for Electrical Connections
As distribution networks carry heavier loads, the risk of overheating at electrical connections becomes increasingly important to manage. Regular contact-resistance checks help identify developing faults before they contribute to excessive heat or service problems. The ZD1C Contact Resistance Tester is designed to measure low resistance in electrical contacts and joints, supporting routine inspection and condition assessment across power-distribution equipment.
The tester is used to measure contact resistance in circuit breakers, disconnecting switches, earthing switches, bus joints, bushing contact joints, and welding joints. It is also suitable for other low-resistance measurement applications. By applying a 100A DC test current and measuring the voltage of the tested object, the instrument determines resistance according to Ohm’s law: R=U/I. This current-and-voltage measurement approach gives maintenance teams a consistent basis for checking connections and comparing recorded results over time.
Applications and Inspection Value
Contact resistance is a useful inspection value when assessing the electrical condition of a connection. A high-load network makes reliable contact points particularly important, and scheduled measurements can help maintenance personnel detect changes that merit investigation. The ZD1C can be applied to switching equipment and connection points, including circuit breakers, disconnecting switches, earthing switches, bus joints, and bushing contact joints. Welding joints and other low-resistance items are also within its stated application range.
The tester’s 100A DC output supports contact-resistance testing by providing test current while voltage is measured at the object under test. Resistance is calculated using the relationship between voltage and current, R=U/I. In practical inspection work, users can record measurements against the relevant device or series number, then refer to saved results when reviewing equipment condition. This makes the instrument useful for routine electrical maintenance, troubleshooting, and keeping test information organized for later checks.
For repeatable inspection routines, the selectable output duration lets the user set the current output time between 1s and 60s. The display presents output current, output time, and resistance during testing, allowing key readings to be viewed as the measurement is performed. These functions support a clear workflow: identify the device, run the test, observe the measurement values, and retain the result for reference.
Features for Practical Test Work
- Current output time can be set between 1s and 60s to suit the intended test procedure.
- The device’s series number can be saved to help identify results and check them conveniently.
- Output current, output time, and resistance are displayed during testing so users can follow the measurement process.
- The tester memory stores up to 100 test results, providing a record for review without needing to rely only on handwritten notes.
- A built-in clock records the date. Stored results include the device’s number, testing time, and resistance.
Saving device identification alongside the test time and resistance helps maintain a more useful measurement history. The stored information can support follow-up inspections and comparison of results associated with a specific device. The built-in clock and result memory are practical aids for organizing field or workshop testing, while the on-screen readings help users monitor the main values during each test. These functions are intended to make low-resistance checks easier to document and review as part of ongoing equipment maintenance.
Technical Specifications
Review the measurement range, resolution, accuracy, power requirements, and operating environment below when planning an inspection or selecting the instrument for a low-resistance testing application.
Test current: 100A |
Output power: 1kW |
Measuring range: 0.1μΩ to 20000μΩ |
Accuracy: ± 0.5% rdg ± 0.2μΩ |
Range 0.1μΩ to 999.9μΩ， |
Ammeter accuracy: |
Dimensions: 403×330×178mm |
General Conditions and Result Management
General |
Memory capacity: 100 results |
Power supply: 198 to 264VAC 47 to 63Hz |
Environment：-20 to 50℃ Humidity ≤90%RH Non-condensing |
The specified power supply and environmental conditions provide important reference points for planning where and how the tester will be used. The memory capacity is 100 results, and each stored result includes the device’s number, testing time, and resistance. Keeping those records associated with the relevant equipment can help users organize inspection information and revisit measurements during maintenance reviews. Use the stated operating environment and non-condensing humidity condition as part of appropriate test preparation and instrument care.
For ongoing application value, keep saved readings organized by device identification and review them alongside subsequent tests. Following the specified power and environmental conditions, selecting an appropriate output time, and confirming the displayed current, time, and resistance help establish a straightforward measurement routine. The ZD1C combines a 100A DC test current, low-resistance measurement capability, on-screen test information, and saved results for inspection work involving electrical contacts and joints.
