Building Lowpass Filters; Building Highpass Filters - National Instruments BNC-2090A User Manual

Channels that use these filters have greater output impedance. This can result in
Note
loading errors if the connected load impedance is not much higher than the filter's output
impedance.

Building Lowpass Filters

Building Highpass Filters

© National Instruments Corporation
Building lowpass filters for the analog output signals is the same as for the
analog inputs. Refer to the
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.
AO 0
AO GND
Figure 3-12. Lowpass Filter on AO 0
Building highpass filters for analog output is the same as for analog input.
Refer to the Analog Input Signal Conditioning
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.
AO 0
AO GND
Figure 3-13. Highpass Filter on AO 0
Analog Input Signal Conditioning
R34 = 39.8 kΩ
C1 = 1 μF
R34 = .0005 μF
C1 = 6.34 kΩ
3-13
Chapter 3 Signal Conditioning
section for
AO 0
BNC Connector
section for more detailed
AO 0
BNC Connector
BNC-2090A User Manual