As David Schleef says, you'll have to use a buffered analogue i/o board if you want to take samples every 20us and drive a smooth voltage ramp. I've seen occasional interrupt response latencies well above this on a 100MHz Pentium system. Depends how smooth you want. Try it first with a 100us RT periodic task on your 486 and see if that's good enough. You might consider filtering the ramp output. John On Thu, 01 Jan 1970, you wrote: >For those of you whom are checking jitter, what kind of ranges are you > getting? My future application necessitates data acquisition every, say 20 > microseconds (I say "say" because this could be 50 or 100, but I'd prefer > 10). I generate a voltage ramp along with the data acquisition to drive a > magnetic field - the resultant ramp (over 1000 or so points) needs to be > nice and smooth. I'm hearing ranges of 10 microseconds or so. > Ultimately, I want to send the data acquired by Ethernet to another > computer during data acquisition (via TCP/IP). > > Any comments on the possibilitiy of this using a 66 MHz 486? -- John Storrs, Laboratory for Micro Enterprise 125 Culham 1 Site, Culham, Abingdon OX14 3DA, UK tel/fax 01865 407085 email [EMAIL PROTECTED] www http://www.i-way.co.uk/~storrs --- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] ---- For more information on Real-Time Linux see: http://www.rtlinux.org/~rtlinux/
