ADWSystems
Member
I have a quick design that I've been tasked with. The design involves data logging a narrow band of temperature readings from a TC. I know the Analog AD595 chip has a 10 mV/degC out but sine I am working with a narrow range of temperatures, I'd like to increase the slope. My first thought was to use a TI INA128 instrumentation amplifier but so far that hasn't worked and I can't figure out why.
The quick summary of the circuit is: The AD595 output is connected to INA128 Vin+. Vin- is connected to ground. Rg=5.6K (G=10), Vref is grounded. Both chips are running from the same 0/+15 power source.
I can get movement of the AD595 output so I know that's working and thus limits my issue to the in-amp. Can anyone point me in the right direction of what I have done wrong with the IA setup/design?
There are two other designing issues: 1-I'm stuck with what we have around already (Lots of K-type TCs), 2-I don't have access to an oscilloscope.
Thank you for your time.
The quick summary of the circuit is: The AD595 output is connected to INA128 Vin+. Vin- is connected to ground. Rg=5.6K (G=10), Vref is grounded. Both chips are running from the same 0/+15 power source.
I can get movement of the AD595 output so I know that's working and thus limits my issue to the in-amp. Can anyone point me in the right direction of what I have done wrong with the IA setup/design?
There are two other designing issues: 1-I'm stuck with what we have around already (Lots of K-type TCs), 2-I don't have access to an oscilloscope.
Thank you for your time.