Vaisala PTB200 User Manual download pdf (Page 5)

PTB 200 4 (28)

Digital Barometers

SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1

2.2 Grounding

A single electrical cable with a screen and five or six wires is

recommended for power and serial bus connections. The cable

diameter should be 5 ... 10 mm.

The screen of the electrical cable must be grounded properly to achieve

best possible EMC performance. First remove the bushing from the

barometer housing and then push the cable through the bushing and its

brass disks. Expose the screen braid, but be careful not to open the

braid. Cut the braid and the wires to a suitable length. Pull back the

braid and press it between the two brass disks of the cable bushing to

make a full 360 degrees grounding (see Fig. 2). Then tighten the cable

bushing to the barometer housing.

CABLE SCREEN

BRASS DISKS

Fig. 2 Grounding the cable screening between the two brass disks of

the cable bushing

In addition to grounding the cable screen in the cable bushing, either

the barometer housing or the host end of the cable screen must be

grounded. To ground the barometer housing use one serrated lock

washer between a mounting screw and the housing; the lock washer

breaks the painting of the housing. When the host end of the cable

screen is grounded, the barometer housing must be mounted on an

insulating support to avoid grounding at two points.

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Vaisala PTB200 User Manual Page 5