I am working on a Datron 1281 meter. DC voltage calibration at 10v functions ok, but the Internal source calibration failed. This Meter has the following errors after Internal Source Calibration. Error codes: 2202 1KV Range zero magnitude test (P028). 2192 100V Range zero magnitude test (P021). 2162 10V Range zero magnitude test (P006). What would cause these errors?

M202 (DG211) switchs, pins 6-8 and 1-3. Friday, March 21, 2014, 2:45:46 PM, you wrote: sun> I am working on a Datron 1281 meter. sun> DC voltage calibration at 10v functions ok, but the Internal source sun> calibration failed. sun> This Meter has the following errors after Internal Source Calibration. sun> Error codes: sun> 2202 1KV Range zero magnitude test (P028). sun> 2192 100V Range zero magnitude test (P021). sun> 2162 10V Range zero magnitude test (P006). sun> What would cause these errors?

Михаил <timka2k@...> writes: > > M202 (DG211) switchs, pins 6-8 and 1-3. > > Friday, March 21, 2014, 2:45:46 PM, you wrote: > sun> I am working on a Datron 1281 meter. > sun> DC voltage calibration at 10v functions ok, but the Internal source > sun> calibration failed. > sun> This Meter has the following errors after Internal Source Calibration. > sun> Error codes: > sun> 2202 1KV Range zero magnitude test (P028). > sun> 2192 100V Range zero magnitude test (P021). > sun> 2162 10V Range zero magnitude test (P006). > sun> What would cause these errors? > > I have the same issue and prior to seeing this blog i checked the m202 dg11 switchs and did not find an issue. What i did see was noise on the guard around that line which goes to the non-inverting side of the dc amp, where that noise is coming from possibly the bootstrap i am not 100% or i would have fixed it. But it seems like this is a common issue this is the second post i have found on this issue which makes me believe it not a cold solder issue. Ive checked most caps in power supply and dc board if you have any other possibilities please let me know.