1. LV Test Napoli feb 05 Noise ripple: EASY - + CRATE LV cable
+/ ~ 10 mV (150 KHz)
+/GND ~ 1 V (150 KHz)
-/GND ~ 1 V (150 KHz)
EASY
CRATE
- +
mP GND
crate GND
shield
LV cable
10 mt
Solutions proposed:
+/GND  C ~ 10 mF
mP GND / crate GND  C ~ 100 mF
better crate GND
sense reference connections
new connector
Same for the HV board
Ana1+
Ana1 –
Dig1 +
Dig1 –
Ana2+
Ana2 –
Dig2 +
Dig2 -
RPC RB3
distrib.
shield
safety
GND
Ref. GND

2. From LV power supply with floating output
Rack LV
From LV power supply with floating output
ALV1
AGND1
ALV
DLV1
DGND1
shielded cable
AGND
ALV2
AGND2
DLV
DLV2
DGND
DGND2
shield LV
distrib. board
4 pairs
IRON – MAGNET
safety ground
AGND
FEB 1
chip
chip
AGND
FEB
strip
copper
chip
kapton
Double Gap 2
AGND
DGND
Double Gap 1
Chamber metallic structure
AGND
chip
chip
FEB 6
HVReturn
Copper 2
Copper 1
chamber GND