New Polymer Neodium magnet VIDEO, standard pickup constructions tests and comparison

[-Elepro-]

You should ....

using the pleasantries you said to me:

Don't care.

I was addressing David S not you, move on.

bye

[RedHouse]

using the pleasantries you said to me:





bye

Well, they say imitation is the finest form of flattery, maybe you can flatter someone else.

[MrCandy]

Hi guys
To dispel doubts about our measurements accuracy and its compliance with the stated specification we have conducted constant reference magnetic field physics experiment.
For this we wound etalon solenoid. Solenoid length - 0.15m, Number of turns - 600nt.

Knowing solinoid basic data and measuring DC I we can calculate magnetic field in solenoid center, that is characterized by a homogeneous structure.

B= I*µ0*n
n= N/l
N- number of turns
l - solenoid length in meters
µ0 - Magnetic constant(1.2566*10(−6)

Now we can calculate etalon magnetic field for Hall-effect sensor calibration and we can also get actual data. And this data will be based on facts, not just empty talking.
Everybody can conduct such an experiment, if this everybody is really interested. This suppose to be -Elepro- start point by the way.
We ordered our device in Research Institute, where they got all etalons for calibration and we have no doubts in our measurements accuracy.
Here is all instalation, that consists of Power source, amperemeter, etalon solenoid, oscilloscope(for DCV measurements), Hall-effect sensor SS496A.


SS496A Sensor Vo measurements:

V0=2.575v

Etalon constant magnetic field calculations:

I= 0.29A
Sensor Vout= 2.525v
n=600/0.15= 4000
B= I*µ0*n
B=0.29*1.2566*10(−6)*4000
Solenoid B=1.5mt(15gauss)=0.0015T

Solenoid DeltaV= Vo-Solenoid Vout
Solenoid DeltaV= 2.575- 2.525
Solenoid DeltaV=0.05v


Next we show ~50mT NIB magnet.


Vo=2.575v
Magnet Vout= 0.907v
Magnet DeltaV= 1.668v

Now we can calculate magnet B
Magnet B= Magnet DeltaV * Solenoid B / Solenoid DeltaV
B= 1.668*0.0015/0.05
B= 0.05T=50mT or 500 Gauss.

In our specification we showed averaged data cause field of the magnet has an inhomogeneous structure.
We hope that phisic laws are full functioning in every country. If anybody have doubts in your device data you can do the same experiment.
If you do not have CNC winder to wind solenoid you can use more simple methodics with the help of multimeter we showed earlier.

[Steve Conner]

Did you take the earth's magnetic field into account? It's about 0.5 gauss, which is one-third of the field strength produced by your solenoid, so you could have a 30% error.

File:WMM2010 F MERC.pdf - Wikipedia, the free encyclopedia

(these sensors were designed for use in compasses, amongst other things)

[MrCandy]

Did you take the earth's magnetic field into account? It's about 0.5 gauss, which is one-third of the field strength produced by your solenoid, so you could have a 30% error.

File:WMM2010 F MERC.pdf - Wikipedia, the free encyclopedia

(these sensors were designed for use in compasses, amongst other things)

Steve, maybe you confused 1.5mT with gauss.

Solenoid B=1.5mt(15gauss)=0.0015T
0.5 gauss =0.05mT
Error -3.3%

[Steve Conner]

You're right, I did! Silly American units

[RedHouse]

Par for the course.

Calculations were questionable, asked to validate (by actual measurement) so makes his own device (still questionalbe) and uses other calculations to validate his previous. Mr Technobable, get a meter.

[-Elepro-]

you have a sensor SS496A with sensitivity of 3.3mV/G...... although datasheet says 2.5mv/G (max2.6)

(and if it would be so... instead linearity surely is perfect...)

bye bye

[MrCandy]

you have a sensor SS496A with sensitivity of 3.3mV/G...... although datasheet says 2.5mv/G (max2.6)

(and if it would be so... instead linearity surely is perfect...)

bye bye

First I want to bring your attention to 2 things:
1) Actual VCC was 5.088v
2) Never measure using datasheet information, use actual data.

For example 1 guy measured telecaster pickup with your device and got 1237 Gauss or 123.7mT. Nonsence.

We measured Neo magnet, that can not be divorced from metal cabinet and it showed 168mT=1680 gauss.


Please use real measurements to make any conclusions.

P.S. By the way we are still waiting for A1302...

[David Schwab]

For example 1 guy measured telecaster pickup with your device and got 1237 Gauss or 123.7mT. Nonsence.

Please remember that the sensors have to be calibrated! My meter reads around 760-800 Gauss on a Strat pickup, which is correct.

[MrCandy]

Please remember that the sensors have to be calibrated! My meter reads around 760-800 Gauss on a Strat pickup, which is correct.

David with all due respect it is just empty talking.
We conducted etalon measurements. What other prove do you need to say that our device is accurate?
Please make your measurements as we made here.
You will get you the idea how your device work.
Also we measured strat pickup and here is our results, whent we will get sensor like you do we will do the same.

[-Elepro-]

http://online.physics.uiuc.edu/cours...asurements.pdf

http://online.physics.uiuc.edu/cours...inal_Paper.pdf

http://www.google.com/url?q=http://o...y81KoASNUd989A ...note: 1260 gauss bridge telecaster pickup

On a fender strat with alnico 5 you’ll have between 900 and 1200 gauss

bye bye

[-Elepro-]

http://music-electronics-forum.com/t1424/

[David Schwab]

David with all due respect it is just empty talking.
We conducted etalon measurements. What other prove do you need to say that our device is accurate?
Please make your measurements as we made here.
You will get you the idea how your device work.
Also we measured strat pickup and here is our results, whent we will get sensor like you do we will do the same.
[ATTACH=CONFIG]16323[/ATTACH]

How is it empty? I'm telling you my meter reads the correct range of an alnico Strat pickup. It also reads the proper range for an alnico HB magnet. And it will go out of range when it's supposed to on a neo.

So my original observation is that you listed a magnet as being 650 Gauss when it's really 1193 Gauss. I wouldn't even expect a neo magnet to read 650 G anyway. As I said, I can compare you magnets to a similar size ceramic, and the ceramic is slightly weaker, which is exactly what I would have expected.

So if my meter is wrong on your magnets, it would be wrong on all the other magnets, and it is not. Plus, the sensor was calibrated by Brad when we did the group buy.

I suppose you like photos for proof so....

A5 Strat pickup:


Alnico bar magnet (not the strongest one Ive seen... might be A2, but I think it's A5)


C8 bar magnet


The "~65 mT" small NiB magnet


What you need to do is get a calibrated commercial Gauss meter and compare it to your meter. That's what we did.

[copperheadroads]

I you do a search here you can find out what different types of Alnico bar will read
for instance I have seen posted here a fully charged A5 magnet will read about 660 to 680 gauss. taken at the middle of the magnet .
That is right in the right ballpark for my meter ,as my fully charged a5 magnets usually read the same