Dear Kai,

I once again had a detailed look at the data sheet ( not that I did not read it earlier - but skipped this point ) and it appears that the output is differential. In all the previous occassions the output was used in a single ended ground referenced mode with PC-DAS cards (no problems there) and hence the slip. This is one of those single page data sheets that is folded and kept inside the pack. No mention is made on the type of output. Just have a look at the terminations :



So would I benefit by using a differntial input stage in my DPM to avoid the DC offset ?

I will anyway try out the 1nF between the output terminals and 24V gnd. Also will try and scope for noise between these points.

I am sorry I missed out the termination details in the first post- can you please revert based on the now furnished details, if anything else can be tried out ?

Thanks

Raghu