When supplying power to the passive leakage detection device, there are significant differences in functional characteristics, safety mechanism and applicable scenarios among isolation voltage regulator, stabilized power supply and isolation transformer:
Functional characteristics:
Through the combination of autotransformer and isolation transformer, it not only has electrical isolation ability (input/output has no direct circuit connection), but also can manually adjust the output voltage (such as 0~260V continuous adjustment). Suitable for scenarios that need to flexibly adjust the test voltage.
Security mechanism:
The isolation structure can effectively block the power grid interference (such as surge and harmonic), prevent the fault current from being conducted to the detection equipment, and at the same time, the leakage protection design enhances the operation safety.
Applicable scenarios:
Leakage detection and power supply for laboratories and industrial equipment debugging, which need self-defined voltage and require high isolation and safety.
Functional characteristics:
The core function is to automatically stabilize the output voltage (such as 2% accuracy) and dynamically compensate the input voltage fluctuation or load change through electronic feedback circuits (such as transistors and voltage regulators), but most of them do not have the ability of electrical isolation.
Security limitations:
The input/output of the non-isolated regulated power supply shares the ground wire, and the power grid interference (such as spikes) may be transmitted to the detection equipment, increasing the risk of misjudgment; Only some high-end models integrate isolation modules.
Applicable scenarios:
Leakage detection with strict requirements for voltage stability but low isolation requirements (such as pre-calibration environment).
Functional characteristics:
Only the electrical isolation of input/output (magnetic coupling to transmit energy) is realized, and there is no voltage regulation or voltage stabilization function. The output voltage varies with the input fluctuation, which may affect the detection accuracy.
Security advantages:
Physical isolation completely blocks the grounding circuit, eliminates common-mode interference and significantly reduces the risk of electric shock. The leakage current is extremely small (medical grade requirement < 100μA), which is suitable for highly sensitive equipment.
Applicable scenarios:
Where absolute electrical safety is required but voltage regulation/stabilization is not required (such as leakage current and leakage detection of household appliances).
| device type | Electrical isolation | Voltage regulation | Automatic voltage stabilization | capacity of resisting disturbance | Typical applicable scenario |
|---|---|---|---|---|---|
| Isolation voltage regulator | (strong isolation) | (Manual continuous) | △ (Some models) | (Surge suppression) | Detection of variable isolation voltage in debugging stage |
| Regulated power supply | (Non-isolated) | ✗ | (high precision) | △ (dependent filter) | Stable voltage demand > detection of isolation demand |
| isolation transformer | (completely isolated) | ✗ | ✗ | (common mode elimination) | High security scene, high tolerance of voltage fluctuation |
Safety priority:
If there is high voltage risk in the detection environment (such as wet places), isolation transformers or isolation voltage regulators are preferred.
Accuracy requirements:
When the voltage needs to be stabilized and the input fluctuates greatly, select isolated stabilized power supply or isolated voltage regulator with voltage stabilization function.
Flexible test:
passive leakage characteristics need to be tested at multiple voltage points, and the isolation voltage regulator is more suitable.
https://www.rektest.com/rk9950-program-controlled-leakage-current-tester-2-product/
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Post time: Nov-28-2025
