1. HV Imon in 1th MTCC period
POWER CYCLE
A. Cimmino - P. Paolucci - G. Polese
/ Joint RPC-Trigger meeting
P. Paolucci - I.N.F.N. Napoli

2. HV Imon test with Resistors at 904
31 c
31 c
WITHOUT FAN UNIT
31 c
20 c
WITH FAN UNIT
20 c
20 c
A. Cimmino - P. Paolucci - G. Polese
/ Joint RPC-Trigger meeting
P. Paolucci - I.N.F.N. Napoli

3. HV power cicle test with Resistors at BLG 904
POWER CYCLE
B2 CHO/1
BOARD 1 CH0/1
BOARD 1 CH2
NO FAN-31C
NO FAN-31C
BOARD 2 CH0/1
BOARD 3 CH0/1
NO FAN-31C
FAN-20C
A. Cimmino - P. Paolucci - G. Polese
BOARD 3 CH2
BOARD 4 CH0/1
FAN-20C
/ Joint RPC-Trigger meeting
FAN-20C
P. Paolucci - I.N.F.N. Napoli

4. Sotware and Hardware Reset testSW HW
A. Cimmino - P. Paolucci - G. Polese
/ Joint RPC-Trigger meeting
P. Paolucci - I.N.F.N. Napoli

5. I0set influences Imon readout
I0 changed from 800 microA to 750 microA
A. Cimmino - P. Paolucci - G. Polese
/ Joint RPC-Trigger meeting
P. Paolucci - I.N.F.N. Napoli

6. HV conclusion
We were able to reproduce the instability effect at BLG 904 using resistive charge  problem is not related to the detector/cable
Measuring independently the current on the ground wire we understood the instability was on the monitored current (Imon) and not on the generated current.
The increase let us suspect to a thermal drift of some components and so we begin to use the CAEN fan unit to ventilate the boards.
Using the fans the board temperature went down from 31oC to 20oC and for 6 days Imon was very stable but increased on the 7th
The s of the Imon distribution of the ventilated boards is 0.2 mA and it was twice without fan.
Software power cycle do not affect the Imon (offset is constant)
Hardware power cycle of any board present in the EASY crate affect the offset of all the boards in the crate.
CAEN got all the results and is now trying to reproduce them in their lab. Some critical components has been found !!!!
A. Cimmino - P. Paolucci - G. Polese
/ Joint RPC-Trigger meeting
P. Paolucci - I.N.F.N. Napoli