Zd3C Contact Resistance Tester
The ZD3C Contact Resistance Tester is designed to measure the resistance of circuit breaker contacts, switchgear contacts and bus-bar joints. These are connection points where resistance measurement
ZD3C Contact Resistance Tester
Contact Resistance Testing for Electrical Connections
The ZD3C Contact Resistance Tester is designed to measure the resistance of circuit breaker contacts, switchgear contacts and bus-bar joints. These are connection points where resistance measurement can help users assess and document the electrical contact condition. The tester calculates resistance according to Ohm’s law, using the relationship R=U/I. This measurement approach supports a consistent way to check the listed types of electrical connections.
For field checks, maintenance work and equipment inspection routines, the instrument brings current, time and resistance together on the display during testing. Keeping these readings visible while a test is in progress helps the operator follow the measurement without needing to rely on a resistance value alone. The tester is intended for contact-resistance tasks on the equipment types identified above, making it relevant where technicians need to check and record connection results.
The ZD3C allows the current output time to be set between 1s and 60s. This gives the operator a defined setting to use for a test, while the selectable test current modes provide options for measurement work across the instrument’s stated ranges. Select the setting appropriate to the task, then review the displayed readings and stored result for that test.
Operation, Identification and Result Storage
The tester can store up to 100 test results. Users can enter the device’s number to make it more convenient to identify and check a result later. The stored record includes the device’s number, testing time and resistance, providing useful context when reviewing measurements from more than one item of equipment. A built-in clock records the date, supporting the organization of test information over time.
This combination of device identification and stored readings can support routine inspection records and follow-up maintenance checks. Rather than viewing a result only at the time of testing, operators can retain measurements in the tester and use the recorded details to locate and review saved results. The 100-result memory capacity is specified for storing test results; each stored result includes the device number, testing time and resistance.
During measurement, current, time and resistance are displayed. Showing these values during the test provides a direct view of the measurement activity, while the stored record and date information help with subsequent checking. These functions make the instrument useful for users who need both an on-screen reading and an organized record of contact-resistance testing.
Test Modes and Technical Specifications
The following specifications describe the ZD3C’s selectable test-current modes, output power, measuring ranges, accuracy, resolution and instrument dimensions. Use the stated ranges to select a suitable current mode for the resistance measurement being performed. The specified measurement and ammeter accuracy values describe the instrument’s stated performance.
Test current: 100A, 200A, 300A selectable |
Output power: 100A mode: 1kW |
Measuring range: 100A mode: 1μΩ to 20mΩ |
Accuracy: ±0.5% rdg ±0.2μΩ |
Resolution: 0.1μΩ to 999.9μΩ, resolution: 0.1μΩ |
Ammeter accuracy: ±0.5% rdg ±0.1A |
Dimensions: 427×357×193mm; weight: 9kg |
The available 100A, 200A and 300A settings correspond to different output power and measuring-range values, as listed above. The stated resolution varies across resistance intervals, so consult the appropriate range and resolution when recording a measurement. Together, these specifications provide the information needed to match the tester’s stated operating modes to contact-resistance testing requirements.
General Information and Application Support
The ZD3C is specified with a memory capacity of 100 results and operates from a 198 to 264VAC power supply at 47 to 63Hz. Its stated environmental operating temperature is -20 to 50℃, with humidity of ≤90%RH, non-condensing. These general conditions are provided to help users consider the instrument’s power and operating environment when planning inspection or maintenance activities.
General |
Memory capacity: 100 results |
Power supply: 198 to 264VAC, 47 to 63Hz |
Environment: -20 to 50℃ |
In practical use, the date record, device-number entry and saved measurement details can help maintain an orderly trail of contact-resistance checks. These functions are relevant when testing circuit breaker contacts, switchgear contacts or bus-bar joints as part of equipment inspection and maintenance. The tester’s measurement display, selectable current modes and result memory combine the test process with straightforward result review, while the listed technical data helps users confirm suitability for their intended application.
