Envelope Detection - Band specification question

Hello,
I'm using the Envelope Detection vi from the Sound and Vibration Meas Suite but I'm having trouble determining values for the Band Specification.
I understand that one value is the center freq and the other specifies the span on either side of this center freq.
The waveform I'm feeding to this function has a resolution of 5000 S/s so I assumed my span can't exceed the max frequency content of my waveform.
If I enter a center freq of greater than 2500Hz I get an error stating that the value is invalid. This makes sense.
However, with a center freq of 2500Hz my span can only be as high as 1250Hz. If I enter 1251Hz or higher I get the following error:
Error -20003 occurred at SoundVib_Resampling.lvlibAT Single Stage Decimation with IC.vi in
SoundVib_Resampling.lvliba_Decimation with CIC and Compensation Filter.vi:13 in
SoundVib_FaultAnalysis.lvliba_Shift and Low Pass Filter (1 Channel).vi:3 in
SoundVib_FaultAnalysis.lvlibAT Envelope Detection (Waveform Output, 1 Channel).vi:1 in
VibrationAnalysis_2.vi
Possible reason(s):
Analysis: The number of samples must be > 0.
Can someone explain to me what these band specification values are for and what their limits are?
Thank you.

You are aware, that the nyquist theorem states that the highest bandwidth you can measure is 1/2 of the sampling frequency? So the 2.5 kHz limit has nothing to do with the span. And also a span of 1.25 kHz (assuming it is in both directions) is the 2.5 kHz limit.
But I never worked much in this domain, so I'm of no further help.
Felix
www.aescusoft.de
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