Spectrum-controls 1746sc-INI4vi Manual de usuario descargar pdf (Pagina 27)

Chapter 3: Things To Consider Before Using Your Module 23

Table 9. Channel update time

(based on number of channels enabled and filter frequency)

Filter Frequency

# of ch. enabled 50 Hz 60 Hz 250 Hz 500 Hz

Current Input 1 20.0 ms 16.6 ms 4.0 ms 4.1 ms

2 20.5 17.7 7.3 7.3

3 19.8 16.6 10.6 10.7

4 21.0 17.0 13.8 13.8

Voltage Input (-INI4vi only) 1 19.7 ms 16.6 ms 5.0 ms 5.0 ms

2 19.7 17.2 9.2 9.2

3 19.7 16.6 13.5 13.5

4 19.7 18.0 18.0 18.0

The 3 dB cut-off frequency is the frequency at which input signals are

passed with 3 dB of attenuation.

Choose a filter frequency so that the frequency of your fastest changing

signal is lower than that filter’s 3 dB cut-off frequency. All frequency

components above the 3 dB cut-off frequency are increasingly

attenuated, as shown in the following figures.

Figure 6. Signal attenuation with 50 Hz input filter

-20

-40

-60

-80

-100

-120

-140

-160

-180

-200

0 50 100 150 200 250 300 Hz

-3 dB

13.1 Hz

Amplitude (in dB)

Signal Frequency

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 57 58

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Spectrum-controls 1746sc-INI4vi Manual de usuario Pagina 27