delabs Circuits

Thursday, March 06, 2014

Electrometer, Gauss Meter and EMF Meter

Hey folks, I'm brand new here and to tinkering with electronics in general. I'm looking into building my own electroscope.

My question is: What's the difference between a static field and an EMF field? There seem to be detectors for both, so I wanted to know what the difference is, and what the relationship between the two is.

Question by BCM USA

delabs Answer

Static Field could be Electrical or Magnetic. Electric Charge as a static Field can be measured using Electrometer

Electrometer, Gauss Meter and EMF Meter

Simple Electrometer - A trivial JFET electrometer isn't a new idea, there are millions of designs for them out on the Internet, this is just yet another. This one is slightly unique in that it is a bridge configuration that makes it ultra-sensitive, much more so than a gold-leaf electroscope, but less than a vacuum tube or electrometer grade FET device.

Static Magnetic Field is measured using A magnetometer  also be called a gaussmeter. Gauss_meter

"Magnetometers are measurement instruments used for two general purposes: to measure the magnetization of a magnetic material like a ferromagnet, or to measure the strength and, in some cases, the direction of the magnetic field at a point in space."

EMF is the field of a Moving Magnet, an AC field. This Moving Magnet could be simulated by a Sine Wave in a Coil. Use a EMF Meter for this. EMF_meter

See some Instruments that are used here - AlphaLab Gauss Meter and EMF Detectors