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measuring small signals

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11 years 1 month ago #1086 by jdc
measuring small signals was created by jdc
From the schematics, it looks like the hardware gain is fixed. ?So I'm wondering how small a signal can be measured. ?The input range is -14V to 20V and so if 8 bit ADC is used, that would give a resolution of 34V/256 = 0.133V, which isn't that good. ?I suspect something clever is done to improve this. ?Are additional bits used? ?Or something else? ?Can low voltage signals be measured?
Thanks!

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11 years 4 weeks ago #1087 by ganzziani

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Replied by ganzziani on topic Re:measuring small signals
The microcontroller itself has an amplifier on the ADC, with multiple gains up to 64x.

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11 years 3 weeks ago #1089 by jdc

Deprecated: Creation of dynamic property Kunena\Forum\Libraries\User\KunenaUser::$karma_time is deprecated in /home/gabotr/kurt.gabotronics.com/libraries/kunena/src/User/KunenaUser.php on line 692

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Replied by jdc on topic Re:measuring small signals
Thanks, that explains it. I got my xminilab yesterday and I did some tests using a voltage divider driven by the AWG output./\r\n/With a signal of about 0.04V peak to peak, the waveform is quite noisy, so that seems to be about the limit of the device./\r\n/Are there any tricks for measuring a smaller AC signal?

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11 years 3 weeks ago - 10 years 11 months ago #1091 by ganzziani
Replied by ganzziani on topic Re:measuring small signals
To get a 100x increase in the gain:
1) Swap R2 (820K) and R3 (180K)./\r\n/2) Replace R7 (20K) with 110K/\r\n/3) Replace R8 (180K) with 4.7K
To understand how to calculate the gain:/\r\n/XScopes Analog Front End
Last edit: 10 years 11 months ago by ganzziani.

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