Similar to the method for testing 78×× series integrated voltage regulators, there are two main methods for testing three-terminal adjustable integrated voltage regulators.
The method of measuring the resistance between the pins. Use the resistance block of the multimeter to measure the resistance value between the pins of the voltage regulator and compare it with the normal value. If the difference is not big, it means that the voltage regulator under test has good performance. If the resistance value between the pins deviates greatly from the normal value, it means that the voltage regulator under test has poor performance or has been damaged. The table lists the resistance values between the pins of typical three-terminal adjustable integrated voltage regulator products LM317, LM350, and LM338 measured by the R×1k block of a 500-type multimeter for comparison and reference during testing.
Table 1 shows the resistance values between the pins of LM317, LM350, and LM338.
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