Yes, you can use a multimeter to measure voltage fluctuations. The multimeter can measure AC (alternating current) voltage, which is the type of voltage that fluctuates in electrical systems. Here are the steps to follow:

1. Set the multimeter to AC voltage mode. This is usually denoted by a symbol that looks like a sine wave (~).

2. Connect the multimeter probes to the circuit or component you want to measure. The black probe should be connected to the ground or common terminal, and the red probe should be connected to the voltage source or the terminal you want to measure.

3. Turn on the circuit or equipment and observe the reading on the multimeter. The multimeter will display the RMS (root mean square) voltage value of the AC signal. You can observe the fluctuations in the voltage by monitoring the reading on the multimeter.

It's worth noting that measuring voltage fluctuations requires a multimeter with a fast response time and a high sampling rate. If the fluctuations are rapid or high-frequency, you may need to use a specialized meter such as an oscilloscope to accurately measure them.

If your LED lights are fluctuating when you plug them in, it could be due to a few reasons:

1. Voltage fluctuations: Fluctuations in voltage can cause LED lights to flicker or dim. This can happen if the voltage in your electrical system is not stable or if there is a problem with the wiring or circuit.

2. Incompatible dimmer switch: If you are using a dimmer switch with your LED lights, make sure that it is compatible with LED lights. Some older dimmer switches are designed for incandescent bulbs and may not work properly with LED lights.

3. Loose connections: Check to make sure that all the connections are secure and tight. Loose connections can cause electrical problems and may result in fluctuations in voltage.

4. Overloaded circuit: If you have too many devices or appliances connected to the same circuit, it can overload the circuit and cause voltage fluctuations. Try unplugging some devices to see if that helps.

5. Faulty LED driver or transformer: If your LED lights are powered by a driver or transformer, it could be faulty or incompatible with your LED lights.

To troubleshoot the issue, try plugging the LED lights into a different outlet or circuit to see if the problem persists. If it does, try removing any dimmer switches or drivers to see if that resolves the issue. If the problem continues, you may need to consult an electrician to diagnose and fix the problem.
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