How to Judge Good Output Wiring Contact of DC Stabilized Power Supplies
To confirm whether the output wiring of a DC stabilized power supply has good contact, you can quickly verify it through three steps: visual inspection + parameter testing + practical verification. The methods are simple and easy to operate, as detailed below:
I. Visual & Physical Inspection (No Tools Needed, Quick Troubleshooting)
- Observe the wiring terminals (e.g., banana plugs, binding posts, aviation connectors). If there are issues such as oxidation (blackening), looseness, or incomplete insertion, they will directly cause poor contact.
- Gently wiggle the output wire connectors and the wire itself. If the voltage/current on the power supply display fluctuates instantaneously or drops to zero, it indicates that the connection between the connector and the terminal is not secure.
- Check if the output wire has damage or broken cores (especially at the root of the connector). Damaged wires easily lead to intermittent contact.
II. Parameter Test Verification (Accurate Judgment, Multimeter Required)
- Voltage Comparison Between Two Ends: Use a multimeter to measure the voltage at the power supply’s output terminals and the voltage at the load’s input terminals respectively. If the voltage difference exceeds 0.2V (for low-current output) or is even larger (for high-current output), it means the wiring has excessive contact resistance and poor contact.
- Current Stability Test: Run the power supply with a load and observe the current value on the display. If the current fluctuates frequently (rises and falls sharply) and the load itself is confirmed to be problem-free, it is highly likely that poor wiring contact causes unstable current transmission.
III. Practical Verification (Simulate Usage Scenarios, Confirm Issues)
- Plugging & Unplugging Test: Fully pull out the output connector, reinsert it into the terminal, and tighten it (turn binding posts clockwise until fully secured). Repeat this 2-3 times and check if the parameters remain stable each time after connection.
- Load Switching Test: Switch between light load (low power) and heavy load (high power). If the parameters show instantaneous disconnection or severe fluctuations during switching, and the wiring shows no signs of looseness visually, the issue may be internal poor contact of the connector (e.g., aging of internal springs).
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