| ??? 09/12/07 17:06 Read: times |
#144489 - DPM input Responding to: ???'s previous message |
Kai Klaas said:
Maybe we shouldn't take Jprao's comment too literally? Maybe he only means, that due to the finite input impedance of DPM, which he hasn't considered in his calculation up to now, the actual division factor is far away from 1000M/1M??
Kai I think this might very well be the case. Most DPM's that I know of have a 'direct' input voltage range of either ±200mV or ±2V, with 'near infinite' input resistance. So, in order to handle the 6V input Jprao mentioned in his first post, it is highly likely that his DPM already has an input divider and that the division ratio of his HV divider is indeed far off the mark. In his first post, Jprao also mentioned he'd already made a table, in order to make his correction scheme work. That would be the perfect answer to Erik's perfect question. Rob. |
| Topic | Author | Date |
| High Voltage measurement | 01/01/70 00:00 | |
| reply | 01/01/70 00:00 | |
| Proper reading? | 01/01/70 00:00 | |
| non linear | 01/01/70 00:00 | |
| Resistor divider rating | 01/01/70 00:00 | |
| NON-linear ??? | 01/01/70 00:00 | |
| what is 'across' the 1M | 01/01/70 00:00 | |
| Does it matter | 01/01/70 00:00 | |
| e.g. A \'protection diode\' may leak a bit | 01/01/70 00:00 | |
| Parasitic ? | 01/01/70 00:00 | |
| DPM are normally very highohmic ... | 01/01/70 00:00 | |
| the problems | 01/01/70 00:00 | |
| A good idea, indeed! | 01/01/70 00:00 | |
| DPM input | 01/01/70 00:00 | |
| Thanks to all | 01/01/70 00:00 | |
| That's all very well | 01/01/70 00:00 | |
| Yes, Jprao, please answer our questions! | 01/01/70 00:00 | |
| DIffierent Divider Perhaps | 01/01/70 00:00 | |
| DPM? | 01/01/70 00:00 | |
| DPM is a widely used term... | 01/01/70 00:00 | |
| many DPMs use ICL7106 | 01/01/70 00:00 | |
Yes, evolves into a heart-stopping thread... | 01/01/70 00:00 |