Guys need a bit of a hand with this one, this concerns the gold series and predecessors. When calibrating with the precision syringe, calibration is successful on the display but on the bellows driven chart I get an inconsistent increase, i.e. 1litre fine, then 2.1 increasing up to 7.5 for 7litres input. I've moved the base plate as advised in the tech manual, and ones fitted with a calibration scale of adjustable screws I've adjusted to no avail. I've even changed the bellows to no effect, this is common to all vitalographs I've inherited across my region, and having had no training on these, well any advice?
