Cryogenic Radiometer Electronic Control System– Combined Sources Sought/Notice of Intent to Sole Source

The National Institute of Standards and Technology (NIST) is seeking information from sources that may be capable of providing a modern, commercial-off-the-shelf control electronics system to replace an outdated system for the POWR absolute cryogenic radiometer (ACR). The new system must provide high-precision temperature control and accurate electrical substitution power measurements. The essential requirements include two independent, low-noise 4-wire AC resistance bridges, two independent electrical substation heater outputs, and overall capability of the two temperature control circuits. • The system should be capable of operation in both open-loop or closed-loop mode with Proportional Integral Derivative (PID) temperature control. • The system should have a servo-loop heater noise level less than 1 pW in open-loop or closed-loop mode. • The system should have a resolution and repeatability within 10 ppm for heater powers above 10 microwatts. • The system should use 100 MB Ethernet and/or General Purpose Interface Bus (GPIB) connections for computer communication. • The system should include LabVIEW or python-based control software for control and monitoring of the system.