I’m using the interface card VM 140 and have some demand for higher resolution. Is there any way to upgrade the DAC or ADC to 12 or even 14 bit resolution? or is there another PC IO card around?
Sorry, the firmware is fixed. It supports the 10 bit ADC and 8 bit DAC output only.
If you do not need all the 8 analog inputs then you may connect your signal in parallel to several inputs. Read all these analog values and calculate the average. I think you’ll get better resolution.
Also on the analog outputs you may combine two outputs (via resistors) and you can double the output levels to 512 steps.
Combine 4 outputs and you can get 1024 different output levels.
You’ll have to output following analog signals to get this to happen:
Output1: 00, 01, 01 … 255, 255
Output2: 00, 00, 01 … 255, 255
Output3: 00, 00, 00 … 255, 255
Output4: 00, 00, 00 … 254, 255
Combined 0, 1, 2 … 1022, 1023
I hope this is not too confusing…