National Instruments BNC-2090A, Руководство пользователя

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Chapter 3 Signal Conditioning
© National Instruments Corporation 3-13 BNC-2090A User Manual
Note Channels that use these filters have greater output impedance. This can result in
loading errors if the connected load impedance is not much higher than the filter’s output
impedance.
Building Lowpass Filters
Building lowpass filters for the analog output signals is the same as for the
analog inputs. Refer to the
Analog Input Signal Conditioning section for
more detailed information about lowpass filters and how to calculate values
for lowpass filters. Refer to Figure 3-14 for component locations.
Figure 3-12 shows a 4 Hz lowpass filter for AO 0.
Figure 3-12. Lowpass Filter on AO 0
Building Highpass Filters
Building highpass filters for analog output is the same as for analog input.
Refer to the
Analog Input Signal Conditioning section for more detailed
information about highpass filters and how to calculate values for them.
Refer to Figure 3-14 for component locations. Figure 3-13 shows a 50 kHz
highpass filter for AO 0.
Figure 3-13. Highpass Filter on AO 0
AO 0
BNC Connector
AO GND
AO 0
R34 = 39.8 k
Ω
C1 = 1
μ
F
AO 0
BNC Connector
AO GND
AO 0
R34 = .0005
μ
F
C1 = 6.34 k
Ω