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GEN7iB

251

INPUT CARDS

Double shielding is strongly recommended to maximum disturbance reduction. Attach

the signal ground to an inner shield of the double shielded cable. The inner shield is

as close as possible to a potential that is equal to the common mode voltage of the

bridge. The shield now minimizes the potential difference between the internal conduc-

tors and the inner shield, thereby reducing the amount and levels of partial discharges

between them. In all cases, the shield is terminated only at the conditioner terminal.

When the inner shield is surrounded by an outer shield that is terminated to ground

at the mainframe connector. The ground shield is used to keep most of the external

disturbances away.

6LJQDOJURXQG

(DUWKVKLHOGKRXVLQJ

Fig. 12.65 Double shielded cable to minimize induced noise

A Strain gauges

B Signal conductors

C Inner shield

Signal ground

D Outer shield

Terminated at connector (measurement channel)

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HBK GEN7iB GEN Series Specifications

General