Measurement-computing DBK202 Series Manuel d'utilisateur télécharger pdf (Page 12)

pg. 12, DBK202, DBK203, and DBK204 Series

938994 DBK Option Cards and Modules

Adding Resistor/Capacitor Filter Networks

WARNING

Disconnect the DBK202, DBK203, DBK203A, DBK204, or DBK204c from power and

from signal sources prior to installing capacitors or resistors.

CAUTION

Ensure wire strands do not short power supply connections (+15 V, -15 V, +5 V, etc.) to

any terminal potential. Failure to do so could result in damage to DaqBook/2000 Series

devices, DaqBoard/2000 Series boards, or DaqBoard/2000c Series boards.

Do not exceed maximum allowable inputs (as listed in product specifications). There

should never be more than 30 V with reference to analog ground (AGND) or earth

ground.

Do not operate DBK202 on an exposed metal surface.

You must provide strain-relief (lead slack) to all leads leaving DBK202, /203, /203A,

/204, or /204c. Use tie-wraps [not included] to secure strain-relief.

Always connect the CHASSIS terminal to earth ground. This will maximize static

protection.

You can install customized RC filter networks to improve the signal-to noise ratio when an unacceptable

level of noise exists. DBK202, /203, /203A, /204, and /204c include sockets for installing RC filter

networks directly on the board.

The following table contains values that are typical for RC filter network components.

Typical One-Pole Low Pass Filter Values

for DBK202, DBK203, DBK203A, DBK204, and DBK204c

R C f f

Ohms µF Hertz (-3dB) kHz (-3dB)

510 1 312 0.31

510 0.47 664 0.66

510 0.22 1419 1.42

510 0.1 3122 3.12

510 0.047 6643 6.64

510 0.022 14192 14.19

510 0.01 31223 31.22

510 0.0047 66431 66.43

470 0.0033 102666 102.67

1 2 ... 7 8 9 10 11 12 13 14

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Measurement-computing DBK202 Series Manuel d'utilisateur Page 12