Detect EMF with an EMF Meter: How to Use, Effects & Errors

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An EMF meter is designed to detect electromagnetic fields (EMF) and can be used effectively for this purpose. The detection process involves measuring changes in magnetic fields, with the circuit primarily responding to powerline frequency magnetic fields. The amplifier in the circuit, typically an operational amplifier, converts current to voltage, while transistors and diodes are used for signal processing and rectification. Changing the values of capacitors, inductors, or resistors will affect the circuit's response and sensitivity, potentially altering the frequency range and accuracy of measurements. Limitations include potential errors from environmental interference and the meter's design constraints.
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http://www.electronics-lab.com/projects/science/006/emmeter.gif"
i want to ask
1. is it used to detect emf ?
is it an emf meter
2. how to detect
3. how does am-plifer work ?
transistor used for??
diode use for?
4 if i change other value of capacitor?
inductor?
resistor?
what will the effects of each??
5. what is the error will be?
is there any limitation?
thankss
 
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Well, if the 1mH coil at the left is an open slug, then this circuit will respond to changing magnetic fields. The current-to-voltage converter stage (the opamp) has a single pole 3dB lowpass at around 1kHz, so this circuit looks to be mainly for sensing powerline frequency B fields. Hey, maybe you should offer to visit Buisness Man and help him with his power problems!

https://www.physicsforums.com/showthread.php?t=142685
 

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