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Before we get into how to read the voltages with a multimeter, first we’ll go over the pinout of a voltage regulator, so that you’ll know which pins to read voltages from.

eh11a regulator datasheet & applicatoin notes – Datasheet Archive

This is normally volts higher. Being that a voltage regulator passes out a regulated output voltage, the only test we must do to check a voltage regulator is a voltage test.

If we don’t read the correct voltages, then more than likely it is a defective regulator. An adjustable regulator can be tested in the same way. Unlike fixed voltage e11a, adjustable regulators can be regulated to output adjustable voltages. If we read a higher voltage, then the voltage regulator is receiving sufficient voltage to regulate down.

A voltage regulator is a device that takes in an input voltage and regulates it down to voltae voltage that it is rated for.

So we’ll now go through specifically how to test a voltage regulator. Measuring the Output Voltage Now that this step is complete, we now read the output voltage. The LM is a voltage regulator is rated to output 5 volts, so we should read this output.


If the regulator isn’t receiving sufficient voltage, of course it will not be able to output its rated regulated voltage. The voltage regulatoor we should read should be higher than the voltage the regulator is rated to output. If the multimeter does read a eh11 near its rated output voltage, the voltage regulator is functional and is good. How To Test a Voltage Regulator A voltage regulator is a device that takes in an input voltage and regulates it down to the voltage that it is rated for.

How to Test a Voltage Regulator

The input voltage that needs to be regulated down goes into pin 1 Input. The DC voltage setting is the setting of the multimeter that has the following symbol or sign. To measure the output voltage, we place the same multimeter set in the DC voltage setting and now place the positive probe of volltage multimeter on the output pin ey11a the regulator and the negative probe on the ground pin of the regulator.

This is to make sure that voltage is, in fact, being supplied to the regulator. To test the voltage going into the voltage regulator, we take a multimeter and place it in the DC voltage setting. The ground pin is pin 2. regulagor

We should now read a voltage at or about the rated voltage that the regulator is designed for. If we read at the sh11a pin the voltage which we feed into the regulator and read at the output pin the output voltage which the regulator is rated for, then we know that the voltage regulator is good.


We check the voltage input into the voltage regulator and the voltage output from the regulator. All a user must do is calculate voltsge output that the regulator should output and perform the same test as is shown above to see whether it is good or defective.

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And the regulated output voltage comes out from pin 3 Output. Measuring the Input Voltage When testing the voltage of a voltage regulator, we first check the voltage from the input pin to ground. If we do not, then the voltage regulator is defective, as it does not do the job it was designed for, which is output a regulated voltage. Below is the pinout of the LM voltage regulator: As an example, we’ll use the popular voltage regulator, the LM If the regulator is rated to output 5 volts, then we should read a voltage very near 5 volts coming out from its output.

This is why we do this test. We take the probes of the multimeter and place the positive probe normally the red probe on the input pin of the voltage regulator and the negative probe normally black probe on the volage pin.