Gain doesn't work as expected

[Chris Holt]

The CEE is starting to work well for my application and I am pretty excited about learning more about it. 

I would like to increase the gain to improve the aliasing of my measured small voltage.  When i increase the gain to 2x the measured voltage drops by half on the pixelpulse readout and not much changes.  when I set it to 4x the measured voltage drops by 1/4.  It seems that the software is compensating but the device isnt implementing the expected gain.  What can I try to fix this?  

Thank you for your help.

Chris

[Ian Daniher]

Hi Chris,

Sorry to hear you're having trouble! Can you share the information at http://apps.nonolithlabs.com/edge/debuginfo?

When a gain is selected, the full scale voltage will reduce to 5v/gain, as shown at http://i.imgur.com/rPiOYFP.png. From your description, it sounds like the full scale voltage isn't being modified? Can you take a screenshot of pixelpulse demonstrating the erroneous behavior?

Thanks!
--

Ian

on behalf of Kevin & Nonolith Labs

--
You received this message because you are subscribed to the Google Groups "Nonolith Labs CEE" group.
To unsubscribe from this group and stop receiving emails from it, send an email to nonolith-cee...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.

[Chris Holt]

I am pulsing 190mA as the source and am measuring the heating of a fine wire that is approximately 1-2 ohm in resistance.  when the wire heats the resistance rises slightly and I want to see this.  In these screen shots I am starting with 1x and changing the gain to 2X and 4x.  the amplitude of the responding voltage decreases when i change the gain. 

[Chris Holt]

This is the debug information

Nonolith Connect

Version: 1.3

Platform: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.41 Safari/537.36

CEE

hwVersion: 1.0

fwVersion: 1.3a/ebdffb2a2848da1d*

serial: 239533834393FFFF40FFA0001200

EEPROM data:

Status 64

00: ee 6c e2 90 03 fc 04 fe
08: 16 07 f4 06 6f 06 56 06
10: ff ff ff ff ff ff ff ff
18: ff ff ff ff ff ff ff ff
20: ff ff ff ff ff ff ff ff
28: ff ff ff ff ff ff ff ff
30: ff ff ff ff ff ff ff ff
38: ff ff ff ff ff ff ff ff

[Kevin Mehall]

Hi Chris,

Can you try reflashing your CEE's firmware?
http://apps.nonolithlabs.com/fwupdate?image=cee_1.0/fw_1.2.json

--

Kevin Mehall
Nonolith Labs

[Chris Holt]

I tried the re-flash but it seems to be doing the same thing.