An SMPS (Switched-Mode Power Supply) tester is a tool used to diagnose and test the functionality of SMPS units. These power supplies are commonly used in computers, industrial machinery, and various electronic devices. The primary function of an SMPS tester is to ensure that the power supply is delivering the correct output voltages, is stable, and is functioning without errors.

Here are the key features and functions of an SMPS power supply tester:

1. Voltage Output Testing

• The tester can check various output voltages such as +12V, +5V, +3.3V, -12V, and +5VSB (standby power).
• It ensures that the SMPS provides the correct voltage for the load it’s designed to support.

2. Power-On Self Test (POST)

• Many testers offer a simple POST function to verify the power supply’s basic functionality. When the power supply is connected to the tester, it will display whether the power is on or if there is a failure.
• If the SMPS is functioning properly, the tester will show green lights (or positive indicators). If not, red lights (or failure indicators) will alert the user.

3. Current and Load Testing

• Some advanced SMPS testers allow for load simulation by adding a resistive load. This is useful for ensuring the power supply can handle its rated output under actual operating conditions.
• They can also monitor the current drawn by the load and provide diagnostic readings, which can help in identifying issues like overcurrent protection triggering.