What is the maximum frequency measured with FP-1000, FP-AI-100

[Sergey(PSU)]

I have FP-1000, FP-AI-100 and analog accelerometer.
I am going to measure up to 200 Hz vibrations. Is it possible with my current configuration?
Thanks.

[Aaron_G]

No, it is not possible with your configuration. FieldPoint is a single point measurement system. There are no timed acquisitions, nor buffering. The FieldPoint sample rate is constrained by both the communications rate between the computer and network module and the input module sample rate. Those two rates are asynchronous from each other.

The FP-AI-100 module has an All Channel Update Rate of 2.8 ms, thus each channel is being updated at roughly 360 Hz. The FP-1000, with a Baud Rate of 115200 baud, and trying to read only one channel from the FP-AI-100, will take approximately 6.2 ms or ~161 Hz. A program to determine the approximate comm rate for serial modules is at ftp://ftp.ni.com/support/fieldpoint/Server/fp16_rates.vi . Your actual sample speed will be the lower of the two rates (~161 Hz).

Additionally, remember that the two rates are independant from each other, thus your samples will not be 6.2 ms apart, but will vary, leaving you with different time deltas between samples. The timestamp returned by the FieldPoint VIs on the serial module represent the time at which the reply is received by the computer.

Regards,
Aaron

[Sergey(PSU)]

Thanks Aaron for quick response.
But what is a maximum actual frequency that could be measured by my configuration?
Is it 160 Hz? Or you suggest to check it using program from ftp?
if for examle I need only 20 Hz is it posssible?
What about FP-2000? will it make much difference for frequncy measurements?
Thanks again.
Sergey.