I have been interested in this thread - it is pretty normal for people (managers/clients) who don't actually use LV or DAQ to ask for something that doesn't make complete sense.
Then the questions when quoting may be: Do I quote it straight up, even though it is kind of stupid (trying to re-address the actual problem with more sensible solutions later, and risking losing the job to someone who gets a dialog going early)? OR Do I risk irritating them by trying to make it make sense from the start (and potentially convincing them that I don't understand their application)? OR Do I make assumptions that they really don't know what they want and would appreciate a pared down solution that is both economical and effective? This one looks classic. What could possibly be the point of taking data at 10 S/s and then averaging it down to 2 seconds? Is there a Nyquist reason for this? Are there intermittent bursts of data at a frequency of 1MHz that will not be resolved at lower sampling rates? Either the spec is all wrong or something kind of odd is going on. I suppose giving more specifics abouit the application is out of the question? Mike > -----Original Message----- > From: E. Blasberg [mailto:[EMAIL PROTECTED] > Sent: Tuesday, February 10, 2004 9:30 AM > To: info-labview > Subject: 60MS/sec- is this possible? > > > > Hi All, > > This may sound naive, but I have a customer who wants to sample up to > 6 channels across 3 boards (2 channels/board) at a sampling rate of > 10 Megasamples/sec/channel (i.e., 60 MS/s in total). > > Three different units are being measured simultaneously, which is why > 3 boards are necessary (they don't all start or stop at the same > time, but they could all be on at the same time). > > Currently the system measures 50KS/s/channel with no problem (plus up > to 2 channels of AO). The data is averaged each second and put into > a FIFO buffer which is usually 2 minutes (120 samples) long. Every 2 > seconds, the FIFO is averaged (to get a running average). I should > add that a GPIB data logger is read every 2 seconds for slower data. > > My NI rep has suggested the PCI-6115 whose specs could certainly > handle this. What I'm worried about is the computer keeping up with > averaging 60MS/s. > > Anyone have any experience using these data rates over an extended > period of time (measurements can last WEEKS). > > Much TIA, > E. Blasberg > iDAQ Solutions Ltd > >
