6.2 Thermal equilibriumPlace the package and test board in the ring cold plate. Prior to recording the initial conditions of the thermal test, verify that the device has reached a state of equilibrium with the ambient temperature. To verify that stabilization has occurred, wait an initial 5 minutes minimum, then record the TSP, wait an additional 5 minutes and record a second TSP. If TJ as determined by the TSP measurement is less than or equal to 0.2 °C, then equilibrium has been achieved. If equilibrium has not occurred, then continue for additional 5 minute intervals.6.3 Initial readingsAfter equilibrium has been reached, record the values for the TSP and the initial board temperature TB0.6.4 Apply powerThe power levels shall be chosen such that the junction temperature rise during testing is between 15 °C and 30 °C. Apply the heating voltage (VH) and the heating current (IH) to the device.6.5 Steady stateFor a test measurement to be completed, verification that thermal steady state has been reached shall be done before the final readings can be taken. Steady-state shall be determined as required in section 3.6 of reference [2]. JEDEC Standard No. 51-8Page 76.6 Steady state measurementsAfter a steady-state has been reached, record the values for the TSP, the heater voltage (VH), the heater current (IH), the time required to reach steady state (tHss), and the final board temperature at the end of the test (TBss).7 Usage 7.1 Thermal simulation modelsThe junction-to-board thermal resistance, RJB, will find use as an indicator of thermal performance for incorporation into board level thermal simulation models. How the information is used in a board level simulation and the resulting accuracy will depend on the simulation software. Since RJB is primarily a figure of merit, the resulting accuracy of the board level simulations will be less than could be obtained with a more detailed model.7.2 Simulation validationAnother use of RJB will be the validation of package simulation models by providing defined boundary conditions for simulation. Since the thermal test board can contribute up to 50% of the thermal resistance measured in this test, it is required that the test board be accurately modeled. Actual physical measurements of the test board are needed for accurate models. The junction-to-board determined by this specification must not be confused with similar measurements obtained with the “double cold plate” apparatus.7.3 JB junction-to-board thermal characterization parameterJunction-to-board thermal resistance, RJB, must not be confused with a junction-to-board thermal characterization parameter, JB, determined using the methods specified in “Integrated Circuit Thermal Test Method Environmental Conditions - Forced Convection (Moving Air)”. Frequently, the junction-to- board thermal resistance will be larger than junction-to-board thermal characterization parameter. JEDEC Standard No. 51-8 Page 88 Test conditions to be reported The values listed in table 1, which are needed to describe this test and the results, must be reported when publishing.