Dear Mike, since we are going to work in the area after lunch I postpone the kicker inspection to that time. For now, I just had a short look at the displays: HV1: -0.01 kV, +0.00mA HV2: -0.01 kV, -0.00mA I hope this answers the question concerning the polarity. I just saw in Francoise's report that the LED 'NEG 1' is the lower stack in HV1 where we tested this card 13. Greetings Peter