Excesive resistance was seen in MQT13.L7B1 after PNO.A3 test. The circuit was measured four times with both QPS cards. An ElQA team measured the circuit in the tunnel using PXIs. As a firt observation, a high noise is produced by the converter. Knud suggested to use another current source with low noiseeven at low current. ElQA is already using its own PC inside TP4 to do the ELQA resistance measurement but it does not seem to be enough.
The number of splices in the MQT typre circuits was recalculated and does not match the number in the PCS tool. This needs to be recalculated for each LHC and serve as an input also for the schematic drawings. (Action Markus, Mateusz, Jean Philippe, Stephen)
As a conclusionm QPS resolution does not alow for nOhm measurements. Udiff resolution seems to be 5mV but it is indeed higher, Zinur: U_res is calculated analogically and has thus a higher resolution (how much?)
It is proposed to measure all the 600A circuits once n the tunnel before the long shutdown. We need to evaluate the time and resources needed to measure all 600A circuits. (Action: Mateusz)
The type measurment done on the RCS.A45B1 was presented. The aim of the test was to measure the resistance of circuits segments. Very good results. Promising to even distinguish between internal and interconnection splices.