Do I need an Instron device to calibrate my ELF system?

Question: Do I need an Instron device to calibrate my ELF or WELF?

Answer: No! You can use dead weights and that will work fine. The video calibration tutorial uses one, but it's not necessary.

 

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Error: Handle Driver is Not Loading - Error Code 52

Issue: T-Scan or I-Scan doesn't see the Evolution handle. The Device Manager shows Code 52 error.

Solution:

First enable Windows Updates on your system. Install all the critical updates and see if this fixes the Code 52 error.

If not, this could be caused by a required security patch from Microsoft (that is missing). Info on the update needed:

https://support.microsoft.com/en-us/kb/3033929

Download of the update:

https://technet.microsoft.com/en-us/library/security/3033929

"SHA-2 certificates require KB3033929 on Windows 7

If your certificate uses SHA-2 or has SHA-2 certificates in its chain of trust and you are using it to sign kernel modules, then you should be aware of KB3033929, an update for Windows 7 distributed through Windows Update. On versions of Windows 7 without this update, the kernel will reject signatures made with certificates that use SHA-2, so they cannot be used to get a kernel module to load."

Select your Windows OS, download, install and re-boot the computer.

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How to improve calibration accuracy and repeatability with ELF?

Issue: After calibration with a known load (via the INSTRON) we get errors of approximately +/-20%. We used different sensors but the error remains the same.

Solution: Make sure the sensitivity is set correctly. (The maximum load should be about 80%-90% of the full range.) Check this before the sensor is calibrated by applying the maximum load and making sure the number that is output (% Digital Output) is between 80-90% on the screen. Since the system uses an 8-bit analog-to-digital converter, this would translate to a “Raw” digital output value of about 200-230 out of a maximum of 255 (8-bit).

In the calibration screenshot below, the "Raw" value is 34 (out of 255) for the highest calibration point.

Calibration menu screeshot

This point, 34 (out of 255) is at the very beginning of the Sensor's curve, which is not very predictable. Since the repeatability error is based on the full-scale value of 255 Raw, you will want to increase the Sensitivity until the load you are measuring will use 80%-90% of the full range.

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