ADIS16136 weird behaviour

That is strange. I am sorry about this, but I am tied up for the next day or two, but will get to this as soon as I can.

Best,

NevadaMark

We have four of this gyroscopes. We sampled another one with the same settings but in another computer, and are seeing similar weird behaviour. I'm attaching the .csv file of this other sampling.

Thank you for letting me know.  I am not sure that I understand this, so we will set aside some time to try this ourselves.  While I will try to close on this as quickly as possible, my present set of commitments might delay my next response by 2-3 days.

Best,

NevadaMark

Just letting your know that we have not forgotten about this, but have been consumed with family illness and prior commitments. Sorry about the delay!

So far, I have not been able to duplicate this behavior but I have asked a colleague to take some data on another unit (while I work on another inquiry). Once this data is ready, I will analyze it and consult with the design engineer if necessary. Out of curiosity, does this behavior limit your application?

Thanks,

NevadaMark

Tomorrow I can send you the lot ID of both gyroscopes we tried this in. I have other two we can use for the same test.

This behavior does degrade our application a little, and we are doing some tests to determine if it completely ruins some of our planned features (also likely). I'm not sure if I can give you further details without proper non-disclosure documentation signed but I'll check it.

Hi Peter,

Your timing is amazing because we are running tests on this right now ourselves.  Please don't share anything sensitive or confidential in this forum. I am sorry for the delay but we have other commitments that we are managing around. While I hope to post an update tomorrow, it might take 2-3 more days.

Best,

NevadaMark 

We have gyros with two different lot ids:

LOT_ID1: 0013

LOT_ID2: 0610

LOT_ID3: 2013

and

LOT_ID1: 0013

LOT_ID2: 0608

LOT_ID3: 2013

All four exhibit the same weird behaviour of one or two values that are extremely more likely than the rest to appear and form "lines" in a plot, sometimes they keep the same, sometimes they are straight, and sometimes they curve a little. For example see attached plot and csv of a gyro with the LOT_ID2: 0610 lot id.

Thank you for the additional information. We have been able to identify a behavior that appears to be similar but we are still investigating. More to follow.

Best,

NevadaMark

PeterSate,

You and I have already connected on this, but for public closure of this discussion, I want to share what we have discovered.  In the course of investigating your claims, we have discovered a quantization error in the ADIS16136's signal processing, which explains your observation.  On a positive note, we had already addressed this root cause of this issue when we developed the ADIS16137, which shares the same internal signal processing solution as the ADIS16136.  Moving forward, we going to do the following in the next 2-3 weeks:

1. Provide official documentation of this observation on the ADIS16136 product page, in the form of a "Silicon Anomaly" sheet.
2. Send a Quality Advisory note to all of our distributors and register customers, with an offer to upgrade existing units with the latest version of the firmware.

We sincerely appreciate you investing in using the ADIS16136 and for sharing this experience with us.  While this issue was already addressed, you provided us with an important perspective that would have been difficult for us to envision or observe through our normal gyroscope testing.  It is a great pleasure to work with you. We can't wait to hear more about your work!

Very best,

NevadaMark