Hi,
I’ve just soldered my K8061 USB board together and everything seems to work fine except for that I need to read mV values on one of the Analog Inputs. I’ve managed to double the resolution, but I need to multiply it by 10 or something at least.
0,027V gives 4 (or 8 if I short circuit R65) when I call the “ReadAnalogChanne”l function. This gives me a resolution of 0,003 where I have to get down to at least 0,001.
Has anyone got any bright ideas on how to accomplish this?
[quote=“tnson”]Hi,
I’ve just soldered my K8061 USB board together and everything seems to work fine except for that I need to read mV values on one of the Analog Inputs. I’ve managed to double the resolution, but I need to multiply it by 10 or something at least.
0,027V gives 4 (or 8 if I short circuit R65) when I call the “ReadAnalogChanne”l function. This gives me a resolution of 0,003 where I have to get down to at least 0,001.
Has anyone got any bright ideas on how to accomplish this?
Thanks in advance!
Kind Regards, Tomas[/quote]
Think I solved it my self by changing R65 to 1K resistor instead of the 10K one originally placed there… guess this change should be consistent over the spectrum? (0,020V - 0,050V aprox)
[quote=“VEL255”]I think you have changed R66 to 1K to get higher gain?
This modification will increase the DC offset due to the high gain.
Otherwise it is OK.[/quote]
Right… R66 it is:) I’m actually down at a 560 ohm resistor atm. and this gives me a “resolution” of about 0.00055 V per step which is perfect for my application. I’ll make some test measurements to make sure everything works as intended.
