Hi all,
I have recently come across a problem regarding high voltage modules. Having looked at the Ultravolt 10A-25A modules it mentions:
=E2=80=9CThe 10A=E2=86=9225A Series features a 1000:1 voltage monitor. The = monitor has an output impedance calibrated for use with a 10 Meg=E2=84=A6 input impedan= ce meter. Overall accuracy is =C2=B12.5% with a temperature coefficient of =C2=B1200 ppm per =C2=B0C=E2=80=9D.
I am actually in need of a Voltage readback using 12 bit ADC (ie ~
4000:1 needed) giving a 0 to full scale, for 0 to maximum voltage. The +/-2.5% error can be cancelled at the input (0-5V input generating
0-10KV output) or at the voltage monitor output.
So should I just abandon the use of the voltage monitor and use a potential divider (along with ADC) to get the accuracy I want. My circuit will be floating on 2KV =E2=80=93 would photo-transistors be the way to go for isolation purposes (and if so where could they be best utilised)?
Any help on the above issues would be much appreciated.
Regards,
Ozzy.