Wrote and installed the code for running the ring heaters. Added the rough calibration values that Aidan B had recommended for running the ring heaters. Some data below: Upper: Requested Power = 1.00 Watts Requested Current = .17 Amps Measured Voltage = 6.85 Volts Measured Current = 0.16 Amps Calculated Power = 1.13 Watts Calculated Resistance = 42.81 Ohms Lower: Requested Power = 1.00 Watts Requested Current = 0.17 Amps Measured Voltage = 6.71 Volts Measured Current = 0.17 Amps Calculated Power = 1.11 Watts Calculated Resistance = 39.47 Ohms A quick, back-of-the-envelope calculation shows that the ring heaters are working properly. Although their values are a bit different than ITMY shown in ALOG 8816, this is mostly due to only being roughly calibrated. The next step is to do a long term 4+ hour test to show curvature change and robustness.