DAQ card. Do I need signal conditioning on the front side?
DAQ card. Do I need signal conditioning on the front side?
(OP)
We are looking to use a DAQ card for a dynamometer project and many of the sensor inputs the the DAQ card will be analog. Mostly tach and temp and some inductive pickups from plug wires. Just curious when signal conditioning needs to be employed? Do we need the extra protection? Is that typical before a DAQ card?
Am I even posting in the right place??
Am I even posting in the right place??





RE: DAQ card. Do I need signal conditioning on the front side?
And I'd certainly be very cautious with the spark plug pick-ups. High voltage and expensive DAQ might all end in tears. You'll also need to think about timing resolution.
This is a good forum choice.
RE: DAQ card. Do I need signal conditioning on the front side?
Regarding inductive picups. They are usually linear in response to the spark energy so with a 1000:1 unit, 12KV spark energy pulse would show up as 12V to the card. Obviously I will have to research that a bit to ensure operation is within card limits, etc. We likely would run MUCH less voltage than that.
RE: DAQ card. Do I need signal conditioning on the front side?
12 kV and dynamometer, sounds like you are doing an ICE job. Will you be measuring temperature in the cylinder? You may need to think about EMI getting into the system from the ignition.
Run differential mode. Single-ended will most likely conduct spark energy directly to the ground rail of your DAQ card and that can do many bad things to it. Wrong results, resetting the system, even destroy it if you are unlucky.
That may be what your partner has in mind.
Gunnar Englund
www.gke.org
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