======Assistant for powder temperature coefficients======

{{ en:media:assist-powdertempcoeff.png?30%&link}}

**With this assistant**, you have the possibility to recalculate analytically the temperature coefficients 
//"tcc"// and //"tch"// of the powder model with your self-measured deviations. The temperature 
coefficients changes the behavior when entering a temperature different from the normal temperature.


**This is very useful if you want to simulate charges at different temperatures as accurately as possible.**


The temperature coefficients of a powder model defines the change in burning behavior at 
extremely cold (//tcc//) or warm (//tch//) temperatures of the powder. Nowadays, most 
propellant powders are temperature-stabilized, nevertheless, they are sometimes acting 
extremely differently in their performance behavior. If a powder model does not contain 
values for //tcc// and //tch// ( Both values = 0.0000) the GRT-internal default values are used. 

**The Assistant** can read out measured values from a measured value tab. 
Alternatively, you can enter the measured values manually.


====Automatic readout of the measured values====
**To automatically read out the measurements**, simply create a **Measurement tab**,
which contains **three** measurements of the same charge **at different temperatures**:

  * Charge Cold, e.g. -10°C.
  * Charge Normal +21°C (default, **must** be 21°C / 70°F entered!)
  * Charge Hot, e.g. +50°C


===1. Create a measurement tab===
Enter your measurement results:

{{en:media:assist-powdertempcoeff-measurements.png?50%&link}}

**The temperatures** you enter in the name or note column, can be in **//"C"//** or
**//"°C"//** for degrees Celsius, or **//"F"//** or **//"°F"//** for degrees Fahrenheit as units.

**For the measurement result at normal temperature, 21°C or 70°F MUST be entered!**  

===2. calling up the assistant===
**Make sure that your powder temperature of the charge is at normal temperature before starting the assistant!**

Then click on the yellow star to open the assistant.

{{en:media:assist-powdertempcoeff-powder.png}}
===3. calculate===
The measured values are automatically taken over from the measurement tab you created.

{{en:media:assist-powdertempcoeff.png?50%&link}}

Then click on the button **//[ Calculate temperature coefficients ]//**

===4. Apply===
By clicking on the **//[ Apply ]//** button, the calculated coefficients are transferred to your powder data of the load.

{{en:media:assist-powdertempcoeff-coeff.png}}