Measurement-computing DaqBoard 3000USB Series Manuel d'utilisateur télécharger pdf (Page 119)

• Do not use RC filters in conjunction with additional DBK expansion accessories.

• Prior to installing a resistor to the filter network you must drill a 1/16” hole

through the center pinhole [beneath the board’s silkscreen resistor symbol] as

indicated in the preceding figure. Failure to do so will short-circuit the resistor.

• Do not drill holes on the board for channels, unless those channels are to receive a

filter network (see preceding statement).

• Resistors should be ¼ watt, film-type with up to 5% tolerance. Do not use wire-

wound resistor types.

• A resistor value of 510 Ω is recommended. Do not exceed 510 Ω.

• Capacitors used are to be of the film dielectric type (e.g., polycarbonate or

NPO ceramic), above 0.001 µF.

• RECOMMENDED: For reduction of both Common Mode Noise and Differential

Mode Noise, use one capacitor between Channel High and AGND; and use a

second capacitor between Channel Low and AGND.

• For reduction of Differential Noise [when no reduction of Common Mode Noise is

needed] position a capacitor across the respective Channel High and Channel

Low.

• When in Differential Mode, using capacitors between Channel High, Channel

Low, and AGND may cause a slight degradation of wideband Common Mode

rejection.

• When making a RC filter network, always install a wire jumper between the

relevant FILT CAP LO and AGND. FILT CAP LO terminals are located on

TB9 and TB10.

Appendix A 886994 DBK215 A-13

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Measurement-computing DaqBoard 3000USB Series Manuel d'utilisateur Page 119