Modern secondary circuit testing equipment generally adopts an integrated portable structure, equipped with a large-screen Chinese LCD display. Some high-end models support touchscreen or rotary mouse operation, enhancing the interactive experience.
To adapt to complex working conditions, some products feature a fully enclosed insulated shell design that is windproof, sandproof, shockproof, and leakproof, enhancing the reliability of the equipment in outdoor or harsh environments.
For example, the CZ3140 main unit weighs only 1.5Kg and is compact in size, making it particularly suitable for field operations without AC power. Most equipment uses built-in high-capacity lithium batteries for power supply, enabling long-term continuous operation and eliminating dependence on external power sources.
Furthermore, some testers support data storage functions, allowing for long-term storage of multiple sets of measurement results, and are equipped with an RS-232 communication interface for easy connection to a computer for data transfer and subsequent analysis.
In terms of wiring, a four-terminal wiring method is used to reduce the impact of contact resistance on measurement results, ensuring high-precision measurements. For scenarios requiring uninterrupted power testing, the equipment can sample via a clamp-on current transformer, completing online measurements without disconnecting the secondary circuit.
