DC Regulated Power Supply Works Normally But Current Shows 0? Two Main Causes & Exact Solutions
27 Mar 2026
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In electronic testing, product R&D or equipment maintenance, many people encounter a tricky problem when using adjustable DC regulated power supplies: the power supply can normally power the load and the equipment runs without abnormality, but the current on the panel always shows 0.00A. Many people mistake it for a power supply failure, but in fact, this situation is mainly caused by insufficient display accuracy and accidental operation to clear output values. This article will break down the reasons one by one, provide targeted solutions, and explain the reset and clear logic of KUAIQU power supplies in detail.
1: Insufficient Display Accuracy, Small Current Cannot Be Identified
This is the main reason why the current shows 0 but the power supply works normally, especially when testing low-power equipment (such as sensors, small modules, standby circuits).
The current display accuracy of ordinary DC regulated power supplies is mostly 0.01A (10mA) or 0.001A (1mA). When the actual working current of the load (such as standby power consumption, working current of small current modules) is lower than this accuracy threshold, the power supply screen cannot identify it and will directly display 0A.
Key Point: At this time, the power supply is not without output current, but the current value is too small to exceed the display range of conventional power supplies. This is a normal phenomenon and not an equipment failure.
Solution: Choose a High-Precision DC Regulated Power Supply to Capture Microcurrent Accurately
To display microcurrent clearly and test the standby power consumption of equipment accurately, the core is to replace it with a higher-precision DC regulated power supply.
Take the KUAIQU SPPS-K series DC regulated power supply as an example. This series supports 10μA level microcurrent testing, which is much higher than the mA level accuracy of conventional power supplies. Even the standby power consumption of equipment and the working current of small current modules can be captured and displayed clearly, completely solving the problem of "0 display for small current" and meeting the professional needs of precision electronic testing and low-power product R&D.
2: Accidental Operation During Use, Resulting in Cleared Output Values
In addition to accuracy issues, another common cause is human accidental operation. During the use of the power supply, if the keys or knob adjustment are accidentally triggered, the output values are likely to be cleared, showing that both current and voltage display 0. It seems that the power supply cannot work, but in fact, only the parameters are reset.
Common Scenarios of Accidental Operation
- Accidentally turning the voltage/current knob to 0 when adjusting it;
- Long pressing the function key to trigger the power supply's value clear or panel lock function;
- Accidentally touching the preset storage key and calling the 0V/0A parameter group;
- Accidentally pressing the output key during operation, resulting in value zeroing with knob adjustment.
This situation has nothing to do with the power supply hardware, and the normal adjustment and output function of the power supply can be restored only through the corresponding reset/clear operation.
[Image 3: Real shot of the power supply being cleared due to accidental operation, with the screen showing 0.00V/0.00A]
3. KUAIQU DC Regulated Power Supply: Factory Reset / Clear Operation Instructions
The factory reset/clear operation methods of different series of KUAIQU DC regulated power supplies are different, and there is no universal key combination. The operation needs to be matched according to the specific model. The following are the general operation principles, and the precise operation methods for specific models are shown in the table below:
| Clear Operation Method | Applicable Models |
|---|---|
| Long press CURRENT button to clear(45S) | R-SPS*, SPPS-C*, SPS*-2KD, SPPS-C*C, SPPS-G*, SPPS-H*, R-SPS*323/USB/485, R-SPS*C |
| Long press LOCK button to clear current(45S) | SPPS-D305, SPPS-D3010, SPPS-D605, SPPS-D1203, SPPS-D2001, SPPS-D3001 |
| Long press V/A button to clear current(45S) | SPPS-D4001, SPPS-D6001, SPPS-D8001, SPPS-D10001, SPPS-*D, SPPS-S* |
| Long press A-FINE button to clear current(45S) | SPS*S, SPS-C*S, SPS*C |
More detailed model information and operating instructions can be found in the downloaded file.
DOWNLOAD
Reset Success Verification Method
Regardless of the model, after completing the reset operation, you can judge whether the reset is successful through the following 3 points:
- Screen Display: After startup, the voltage and current will default to 0.00V/0.00A, and the output is in the off state;
- Adjustment Function: Rotate the voltage/current knob clockwise, the value can rise normally without jamming or locking;
- Output Function: Press the output key, the power supply can turn on the output normally, and can power the load normally after adjusting the parameters.
4. One-Minute Quick Judgment: Is the Power Supply an Accuracy Problem or Accidental Clear?
Faced with the situation of 0 current display, you can quickly distinguish the cause through a simple operation without professional testing:
- Try to adjust the voltage knob: If the voltage value changes normally after the knob adjustment, only the current shows 0 → the cause is insufficient display accuracy;
- Try to adjust the voltage knob: If the voltage and current do not change after the knob adjustment and always show 0 → the cause is that the output value is cleared due to accidental operation, and the reset operation is required.
Summary
- The DC regulated power supply works normally but the current shows 0, not all are faults. It is mainly divided into two types: insufficient display accuracy and accidental clear;
- When testing low-power equipment and standby power consumption, you need to choose a high-precision power supply (such as KUAIQU SPPS-K series, 10μA level accuracy) to capture microcurrent accurately;
- If it is an accidental clear, you only need to perform the corresponding factory reset/clear operation according to the specific KUAIQU model to recover quickly;
- Turn off the output and power off completely before the reset operation, and reset the parameters after the reset to avoid load damage.
Mastering the above methods, you don't need to panic when encountering the situation of 0 current display of the power supply, and you can quickly locate the cause and solve it, improving the efficiency and accuracy of electronic testing.