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Undesired filtering on SCXI -1102C/1303
cincidude
Member
11-12-2004 10:02 AM
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I have set-up a SCXI hardware system set up recently.
Chassis - SCXI 1000
Module - SCXI 1102C
Terminal block - SCXI 1303
Sensor measurement made thru these channels connected on the 1303 show some undesired filtering which may be due to some inbuilt filter which I do not know of. I have already changed the 10 Ohm resistors on the terminal block with the 10 M-Ohm resistors yet no improvement in the signal quality.
Chassis - SCXI 1000
Module - SCXI 1102C
Terminal block - SCXI 1303
Sensor measurement made thru these channels connected on the 1303 show some undesired filtering which may be due to some inbuilt filter which I do not know of. I have already changed the 10 Ohm resistors on the terminal block with the 10 M-Ohm resistors yet no improvement in the signal quality.
AnujD
NI Employee (retired)
11-15-2004 01:53 PM
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Greetings,
On each channel, the SCXI-1102C has a three-pole lowpass filter witha 10 kHz cutoff frequency. Is this the filtering that you are seeing? If not, what "undersirable" filtering are you seeing?
Regards,
Anuj
On each channel, the SCXI-1102C has a three-pole lowpass filter witha 10 kHz cutoff frequency. Is this the filtering that you are seeing? If not, what "undersirable" filtering are you seeing?
Regards,
Anuj
11-15-2004 02:18 PM
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Maybe that is the filtering that I see. I do not have a frequency component over 100 Hz in my signal. So I dont really see how this filter can affect my signal. However, I am sure that the signal is filtered, maybe by this 3-pole filter or something else.
AnujD
NI Employee (retired)
11-16-2004 09:47 AM
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How is your signal affected?
11-16-2004 10:02 AM
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I checked the signal on the scope and the signal has a noise of amplitude of about 0.24 mV. But after recording the signal thru the DAQ system, I do not see this amplitude. The signal is just a flat line.
AnujD
NI Employee (retired)
11-17-2004 07:02 PM
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You may want to look at this:
http://digital.ni.com/public.nsf/websearch/383706DC2DF46BF386256D2D005812C1?OpenDocument
How are you wiring things up and setting things up in MAX? What else have you tried?
http://digital.ni.com/public.nsf/websearch/383706DC2DF46BF386256D2D005812C1?OpenDocument
How are you wiring things up and setting things up in MAX? What else have you tried?
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