Hi,I did the offset check with 12V and 14V when I run the injectors in PWM mode. My result was 0.15ms/V offset. The peak behavior of the PWM mode and P&H board should be quite similar so I would expect the same result.Thomas will have to sort that one out for himself because I don't have a P&H board to test plus doing all the flow measurements to see how the X intercept changes with supply voltage is a lot work.
Another way to check the offset could be in the running car. The AFR value in idle should not change if I reduce the battery voltage from 14V to 12V with a correct offset value. It should be possible with an disconnected alternator?