Be aware that most consumer DAQ cards are not suitable as-is for bridge type
transducers. You typically need a precision bridge supply voltage and some
antialiasing filtering (signal conditioning). If you have long cables, then the
bridge supply needs remote sensing. These vendors make it really easy to take
a bad measurement. If you go with smart/serial or 4-20mA sensors, the
conditioning is a bit easier. This all depends of course how accurate you
want to get. Even getting 1% end-to-end isn't necessarily trivial. Some
12-bit ADCs I looked at recently only had 9 ENOB which is 512 effective counts.
Tack on a cheap sensor and power supply and it's easily over 1%.
I'm probably biased since I used to work in this area.
-Bob
On Dec 16, 2015, at 14:31, Monroe L. King Jr. <monroe@xxxxxxxxxxxxxxxxxx>
wrote:
Wow that's so cheap it's hard not to think about it.
Thanks Terry, I'm sure even if I don't use that someone will!
Yeah I'll get one of those just to have one.
-------- Original Message --------
Subject: [AR] Re: Test Stand DAQ
From: Terry McCreary <tmccreary@xxxxxxxxxxxxxxx>
Date: Wed, December 16, 2015 1:22 pm
To: arocket@xxxxxxxxxxxxx
http://www.dataq.com/data-acquisition/starter-kits/
The DI-149 has eight differential analog inputs, 10 bit (0.1%) resolution,
up to 10 kHz total rate (e.g., 5 kHz if two channels are in use, 2.5 kHz
for 4 channels, etc.) Comes with software that provides a strip-chart-look
output. Plugs into and powered by the USB port. Cost is $59. They have
other starter kits from $29-$300 as well as higher-end hardware.
DATAQ is very popular in the high-power rocketry community. I have used
their hardware and software to test hundreds of high-power rocket motors.
WinDAQ XL ($99) allows the data to be ported real-time to Excel.
Terry