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Grounding and shielding - Ultra-high vacuum (UHV) TONiC system
Vacuum chamber
Readhead
Shield
IMPORTANT: The outer shield should be connected to the machine earth (Field Ground). The inner shield should be connected to 0 V at receiving electronics only. Care should be taken to ensure that the
inner and outer shields are insulated from each other. If the inner and outer shields are connected together, this will cause a short between 0 V and earth, which could cause electrical noise issues.
NOTES:
•
The maximum cable length between the readhead and the interface is 10 m
•
The maximum extension cable is dependent on the cable type, the readhead cable length and the clock speed. Contact your local Renishaw representative for more information.
•
For DOP interfaces the external earthing tag on the interface must be used when mounting the interface on a DIN rail.
Original instructions
Feedthrough
connector
Interface
0 V power
Inner shield
(if fitted)
Customer electronics
5 V
Extension cable
Output signals
0 V
Outer shield
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