What is the correct way to convert dBuA to mA/m for magnetic field strength?

  • Thread starter Thread starter temujin
  • Start date Start date
  • Tags Tags
    Confused Db
Click For Summary

Discussion Overview

The discussion revolves around the conversion of dBuA to mA/m for magnetic field strength, specifically addressing the appropriate logarithmic formula to use in this context. Participants explore the implications of different conversion methods and their relevance to regulatory standards.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions whether the conversion of 60 dBuA/m corresponds to 1 A/m or 1 mA/m, expressing confusion over the use of 10 log versus 20 log.
  • Another participant clarifies that decibels (dB) are relevant to magnetic field strength and suggests using 20 log for the conversion, noting that 10 log is typically used for power calculations.
  • A different participant asserts that 60 dBuA is equal to 1 mA, reinforcing the use of 20 log and providing examples of how dB values relate to current measurements.

Areas of Agreement / Disagreement

Participants express differing views on the appropriate logarithmic function to use for the conversion, with no consensus reached on the correct method. Some support the use of 20 log, while others have not explicitly agreed on this point.

Contextual Notes

There are unresolved assumptions regarding the definitions of dBuA and its application to magnetic field strength, as well as the context in which these conversions are being applied.

Who May Find This Useful

This discussion may be of interest to those involved in electromagnetic field regulations, electrical engineering, or anyone working with magnetic field strength measurements.

temujin
Messages
46
Reaction score
1
Hi

I´m a little bit confused regarding conversion to dB:

Regulations for a project I´m on say the maximum magnetic field strength allowed is 60 dBuA/m at 10 m. (here I chose 60 myself for simplicity...)

So the question is will this correspond to 1 A /m at 10 m (10log[1000000/1]=60 dB)

or will it correspond with 1 mA / m at 10 m since 20log[1000/1]=60dB.

should I use 20log or 10 log?

regards
t.
 
Engineering news on Phys.org
What has dB (probably 'decibell') have to do with magnetic field strength...?

Daniel.
 
It's decibel. I believe you would want to use 20. The 10 is used in power calculations because of the I^2 term in the equations for power, IIRC.

Since this is out of my realm, I would recommend another opinion. I'll do some searching to see if I can find anything concrete.
 
60dBuA is equal to 1mA. Mr. Garvin is correct, you would use 20Log, 10Log is used for power (or more correctly the ratio of 2 powers). for every additional 20dB, add a factor of ten. 80dBuA is equal to 10mA, etc.
KC



Electromagnetics, what a concept.
 

Similar threads

Calculate magnetic dipole of other planets relative to the Earth
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad High School Magnetic Field Lab
  • · Replies 12 ·
Replies
12
Views
3K
What is the Correct Way to Calculate Magnetic Force on an Electron or Proton?
  • · Replies 7 ·
Replies
7
Views
2K
Inductorless DC-DC converters for space application
  • · Replies 51 ·
2
Replies
51
Views
8K
Why Does My E/M Experiment Graph Have an Unexpected Y-Intercept?
  • · Replies 6 ·
Replies
6
Views
5K
Field strength to deflect electron in a cathode-ray tube
  • · Replies 16 ·
Replies
16
Views
8K
Finding the Magnetic Field (B_0) on a Graph [NMR]
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Relation Between the Magnetic Field Strength and Distance
  • · Replies 7 ·
Replies
7
Views
32K
What is the magnitude of the electric field (rod)?
  • · Replies 4 ·
Replies
4
Views
2K
Hysteresis loop magnetization of Gadolinium
  • · Replies 5 ·
Replies
5
Views
2K