LabVIEW
what amplifier will recomended for my k-type theromocoupler using usb 6008
Analog Devices AD594/AD595 Monolithic Thermocouple Amplifiers (Type J / Type K)
This would give you a conversion of 10mv per degree C using a single +5v supply you could get to a couple of hundred C
I get 11 bits of resolution available for the +/- 4v range (11 because I can't see a negative supply available so we are only using one side of the differential range).
That's a resolution of 2048 bits over 4v giving 0.001953 v per bit
The devices above give 10 mv per degree C so you would have about 0.2 C resolution and a maximum temperature of around 450 degrees C an minimum temperature of 0 degrees C.
The device draws about 1mW so you should have no problems with power consumption. (Hint Earth / Ground loops might be a problem).
I should add that whilst I have used this device many hundreds of times, I have never applied it to the USB 6008.
http://www.analog.com/en/prod/0%2C2877%2CAD594%2C00.html
This would give you a conversion of 10mv per degree C using a single +5v supply you could get to a couple of hundred C
I get 11 bits of resolution available for the +/- 4v range (11 because I can't see a negative supply available so we are only using one side of the differential range).
That's a resolution of 2048 bits over 4v giving 0.001953 v per bit
The devices above give 10 mv per degree C so you would have about 0.2 C resolution and a maximum temperature of around 450 degrees C an minimum temperature of 0 degrees C.
The device draws about 1mW so you should have no problems with power consumption. (Hint Earth / Ground loops might be a problem).
I should add that whilst I have used this device many hundreds of times, I have never applied it to the USB 6008.
http://www.analog.com/en/prod/0%2C2877%2CAD594%2C00.html
Message Edited by Conseils on 05-08-2007 08:51 PM
Message Edited by Conseils on 05-08-2007 08:52 PM
Well a different thread...... but yes I think it should do nicely.
Try and use one thread next time...I think you deleted the response before I had chance to finish this one..... 
Ohh yes and your English is probably better than my "fill in your language here" ....
My tip is set up the amplifier on a prototype board before putting it onto the 6008.
Take great care over the power supply connections to the device.
CHECK and RE-CHECK the circuit, especially for short circuits, there is a fuse on the USB 6008 / 9 series circuit boards but I wouldn't want to rely on it. (its surface mount and could be fun to replace if it's not a re-settable type).
Good luck
Message Edited by Conseils on 05-10-2007 09:24 PM
