| ??? 01/18/10 20:07 Read: times |
#172560 - why 8V or 20V Responding to: ???'s previous message |
Sorry , i cant follow You - there was 20V in first post, now You mention 8V.
I suppose it is some very strange loadcell - - today "standard" loadcells with glued tensoresistors have output of 0,8...3 mV/V . Does Your loadcell have 3.5 mV/V output? (70mv/20V)? - Is Your loadcell tensoresistor bridge type? If so - why You thinking high voltage excitation? If not - this discussion is almost useless without loadcell's datasheet. On other side - You can power load cell with "independent" 20V . With resistive divider You can build loadcell's "gnd" point - - to be connected to ADC's "gnd" point - to be 2.5V down-offseted below loadcell's output. Maybe this proposal is wrong - i was thinking about such connection but never tried. regards |
| Topic | Author | Date |
| Isolating xducer | 01/01/70 00:00 | |
| not even a way | 01/01/70 00:00 | |
| noise | 01/01/70 00:00 | |
| I wouldn't do that... | 01/01/70 00:00 | |
| agree | 01/01/70 00:00 | |
| when within specified range!!! | 01/01/70 00:00 | |
| why 8V or 20V | 01/01/70 00:00 | |
| no specs violated | 01/01/70 00:00 | |
| that is TOTALLY irrelevant | 01/01/70 00:00 | |
| Jumping to conclusions | 01/01/70 00:00 | |
| AC modulating the bridge excitation voltage? | 01/01/70 00:00 | |
modulating the excitation | 01/01/70 00:00 | |
| make it simple at start | 01/01/70 00:00 | |
| making it | 01/01/70 00:00 | |
| o, i see... | 01/01/70 00:00 | |
| from my experience with loadcells ... | 01/01/70 00:00 | |
| what is exactly "xducer" ? | 01/01/70 00:00 | |
| Offsetting a signal | 01/01/70 00:00 | |
| Yes but...? | 01/01/70 00:00 | |
| Error analysis and budget | 01/01/70 00:00 | |
| Common Mode suppression | 01/01/70 00:00 |