About a year ago we developed an issue with our PM6000 where there was no current reading on Channel 2.
We tried another shunt but the problem remained. Voltage measured correctly but current was always reading 0 or µA.
We just took apart the interface card (the card which sits between the shunt at the rear of the unit and the backplane inside the unit) and we found two burned resistors in the current measurement area: R423 and R147 - see the attached picture.
Could you please tell us what values these resistors should be and we will replace them?