Vaisala HMP243 Guide de l'utilisateur télécharger pdf (Page 15)

HMP240 series

M210300en User's Guide

3.3 Grounding

A single electrical cable with a screen and three to ten wires is recommended

for power and analogue output/serial bus connections. The cable diameter

should be 7...10 mm.

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

possible EMC performance. Recommended cable shield is done in the cable

gland as shown below.

• remove the brass disks, rubber ring and nut from the transmitter

housing

• strip 165 mm of the cable insulation, but leave 25 mm of the braid

visible

• slip the nut and rubber ring over the cable insulation

• slip the brass disk that has the bigger hole in it over the braid so that

it rests against the cable insulation

• slip the other brass disk over the wires to the middle of the braid

(If the cable diameter is less

than 7mm, use a shrinking

tube or an adhesive tape)

cable

braid

flexible wires 0.5 mm

(AWG 20), stranded wires

recommended

D = Ø 7...10 mm

brass

disks

rubber

ring

nut

brass disks

140

165

shielding tube

braid

• push back the braid and press it between the two brass disks to

achieve a full 360° grounding; the fold between the disks should have

the same diameter as the brass disks

• secure the braid with a shielding tube

• insert the wires into the transmitter housing through the gland

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Vaisala HMP243 Guide de l'utilisateur Page 15