Hello, I'm in the process of calibrating a thermometer/datalogger (Omega DP470) that uses a thermocouple type T (-200-350 deg. C range), and I need a DC voltage source that can feed a steady voltage of 39.000 mV. I believe at this point I can either purchase a precision voltage source that can feed a steady voltage on a millivolt (mV) scale, or manipulate/construct my own using my (0-20V) DC source. The problem is that precision voltage sources are fairly pricey for such a task (~$1000.00), and I would rather construct something that can stabilize my voltage. I am able to dial down the knob on my current DC source to around 39.000 mV; however, it is obviously going to be noisy. Several people suggested putting some resistors in series and see if that would do it, while others have mentioned using zener diodes to maintain a steady voltage. I'm a little on the inexperienced side when it comes to EE and am curious if anyone out there has dealt with a similar situation? Any help or (detailed) tips are highly appreciated! Thank you.