Why is the voltage reading on the display incorrect when the multimeter reads 2400hz voltage?
We must first comprehend the multimeter test value's effective value. Pointer multimeters and digital multimeters are the most widely used multimeters right now. A pointer multimeter has a minimum scale of 0.2 volts and an AC voltage range of 10 volts to 1000 volts. Upon closer inspection of the schematic, it is clear that the AC voltage file is a straightforward rectification circuit created for 50Hz (or 60Hz in the US and Japan) AC voltage testing. Without taking high-frequency characteristics into account, the internal circuit contains rectifier diodes. If the signal frequency being measured is more than 1KHz, it will be won't be accepted.
What about the digital multimeter's test results? The two multimeters of Mouli and Mouke were once put through a comparison test by serious individuals using an oscilloscope.
The test results of 1KHz and 2KHz still serve as a benchmark, and if the frequency is greater, there will be a significant error.
An IC used for measuring is located inside the digital multimeter. The publishing of the schematic diagram is illogical. The operational amplifier (OP) bandwidth and AD conversion rate of the IC are connected to the high-frequency properties of the AC voltage file. We'll have additional information to explain the parameters, but for now, let's simply mention it.
We need to utilize an audio millivolt meter to precisely examine the signal in the 2.4KHz frequency region. This apparatus is a typical audio measuring apparatus. It was pointer type before, but it's now digital. Put a photo there to demonstrate.
