Hi I am looking to interface four load transducers to a pc.
I have been looking for a board that would meet the requirements and I wondered if someone would let me know if the VM140 or the VM167 would be suitable.
The Transducers give an anologue signal based on 0-5 or 0-10V and need an excitation supply of either 5 or 10VDC where can I get this supply on either of these boards.
I know this model of load cell is being used by in a similar way to that which I want to use it using a similar board, they are looking at 4 cells individually and are only using the USB to power it, so I presume that they must be working with a 5V instead of a 10V Excitation.
The software programmer has had a quick look at the spec of your board and has asked if it samples at fast rate, he says that it needs a consistent sample rate of at least 1ms or close to this, he says that usually requires buffering does the board do this or support it in any way?
[quote]so I presume that they must be working with a 5V instead of a 10V Excitation[/quote]On the VM167 board there is +5V USB voltage output.
[quote]he says that it needs a consistent sample rate of at least 1ms or close to this [/quote]The analog input sample rate of the VM167 is 2ms. There are 5 analog inputs on this board.
On the VM140 there are 8 analog inputs.
The sample rate of the VM140 is 2ms if only one channel is sampled. If all the 8 channels are sampled then the sample rate is about 3ms.
[quote]he says that usually requires buffering does the board do this or support it in any way[/quote]On the VM140 there are amplifiers to set the input range to 0-5V or 0-10V.
On the VM167 there are no amplifiers. The input range is 0-5V.