Spd Cabling And Power Supplies

2006 Oct 18 Cesar: Cesar measured the voltage between two negative(ground) inputs of the PLC module with the PT1000 chain, HS0 and HS1 with the following results

all off - 5,2 mv MCM only - 271 mv Bus + MCM - 655 mv

Cesar is going to repeat the test with a cable made by Mike to measure also between two different caen modules in the same module.

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Measurement between two channels in two different CAEN modules, HS0C and HS0A.

100 mV -all OFF

176 mV - 0A(MCM only) 558.7 mV - 0A(MCM + BUS) 558.7 mV - 0A(MCM+BUS) 0C(MCM) 476 mV - 0A(MCM + BUS) 0C(MCM + BUS)

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2006 Nov 8: Michael Burns: Cesar and I tried to do the test using my dummy sector but unfortunately we couldn't finish because the resistors were dissapating so much power that they unsoldered themselves so I have ordered some more powerfull ones so that we can carry with the test on Monday.

As a matter of interest we had everything seeming to be working with approx. 3.5 volts difference between the gnd of the PLC and the gnd of the half stave.

-- Main.ctorcato - 30 Nov 2006 https://twiki.cern.ch/twiki/bin/view/AliceSPD/SpdPowerSupplyCabling#Opens%20page%20in%20new%20window help