CAEN
Electronic Instrumentation
A7030-AG7030 3kV/ 1mA (1.5W) HV Boards
12
Safety Earth connection
The connection of return to Earth is fundamental for User safety. The connection must always be at the level of
detector or power supply system. Return connection even if not present or performed incorrectly, due to protection
circuits implemented on the A7030 are bound to Earth; in this case the voltage difference between return and Earth
(System), is limited to approximately 50V. Please note that this is a status of emergency-protection, not a working
one. The Connector Configurator allows to optimize the connection of the return and of DGND (Earth). The best
configuration must be determined by the user upon application, the optimal connection depends on many
characteristics of the related experiment.
The following diagrams show two examples of configuration, namely:
The “closed loop “ Earth configuration (J
1 contacts closed)
The “open loop” Earth configuration (J
1 contacts open)
HV Generator
Load
0
HV Channel 0
RETURN
Load
47
HV Channel 47
EARTH of
DETECTOR
Circuit Protected
RETURN
HV CABLE
DGND
J1
1
HV Generator
Load
0
HV Channel 0
RETURN
Load
47
HV Channel 47
EARTH of
DETECTOR
Circuit Protected
RETURN
HV CABLE
DGND
J1
2
Fig. 4
–
Earth configuration connection examples
