j.p.bill said:
No question that the logger will record data. Do you get enough resolution out os 8 bits? that's only 256 discreet levels. If you are also looking for transients in the thrust, can it sample at frequent enough intervals to catch the spikes?
Well I dont want to have too many bits, or else I'll have too many data points to graph.
https://www.dataq.com/products/startkit/di194rs.htm
When ever I searched google, dataq was always #1 on the list. To tell you the truth, Most people who test their engines use dataq loggers. I Also figured that I wouldnt have to run a long serial/parallel port cord from the test stand to the computer, I can just run a long cord like so:
Computer-Data logger---------------------Test stand
Instead of
Computer---------------------Data Logger-Teststand.
Since Im only measuring voltage, theres only a distance of about 40 feet between the test stand and the computer. In worst case scenario, I would have to design a circuit to get rid of the noise. However, I Do have a mini computer (Old HP 400Mhz) thats pretty small. I could set it on a table and use that instead of a lappy.
Motor Burn times are Very short, and are around .1 seconds to 1 second (but it depends on how long the motor is, how wide it is, propellant grain, and what type of propellant is used). An added bonus is it comes with 4 channels, so if there was a need to measure other things, I could. And at 25 bucks, I dont think you could beat that kind of a deal.