adamp
New Member
Posts: 14
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Post by adamp on Aug 28, 2019 12:11:59 GMT -5
Could anybody tell me if there is documentation available for the 3 axis orthogonality correction that was announced in the newest firmware release of the F71 Teslameter?
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Post by Lake Shore Ryan on Aug 29, 2019 23:42:51 GMT -5
Hi, I'll see if I can find something to pass along. We're still doing our own testing of the feature, so an official procedure hasn't been released yet. We just added the ability to add a 3x3 rotational matrix to the EEPROM of a connected probe. Do you have the capability to identify the angular error in your probe?
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Post by Lake Shore Ryan on Sept 3, 2019 15:53:18 GMT -5
adamp, all I can provide at the moment is the formula and command set. We're still working out the optimum procedure ourselves to populate the correction matrix with reliable, traceable variables. If you wanted to try this, you would need to determine your own method for determining the correction factors based on how you plan to identify your sensor misalignments. Let me know if you think this is something you plan to attempt, or if this would be a service you'd be interested in once we develop the capability. 
I would expect X x, Y y and Z z to remain '1', while all the other correction terms would be very small values close to '0'. The commands you'll need are: CAL:PROBE:MATRIX Xx,Xy,Xz,Yx,Yy,Yz,Zx,Zy,Zz Where each term is a float value. This creates a new rotational matrix in memory, ready to be stored on the probe.
CAL:PROBE:MATRIX? Return the current rotational matrix stored in memory (will be different to what's on the probe if the 'store' command hasn't been sent). By default this should be an identity matrix, so the returned values would be 1,0,0,0,1,0,0,0,1
CAL:PROBE:STORE Save the rotational matrix to the attached probe's EEPROM, at this point, the new matrix will be used to produce corrected field readings on the teslameter.
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adamp
New Member
Posts: 14
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Post by adamp on Sept 12, 2019 10:00:19 GMT -5
Hey Ryan thanks for getting back to me, this is very helpful information! We are trying to work on a way to determine the angular error of the sensors, but we have a lot of work in the pipe already so it may take some time.
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Post by Lake Shore Ryan on Sept 13, 2019 13:35:14 GMT -5
No worries. Hopefully we'll have progressed a little more too by then. Our end goal is to be able to sell this is a service, we just want to make sure that this correction is true, traceable and worth the extra money  . By the way, thanks for purchasing our products and checking in on the changelog. I often wonder if I'm just writing it for my own benefit . |
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. By the way, thanks for purchasing our products and checking in on the changelog. I often wonder if I'm just writing it for my own benefit