# Main Operation

> [!note] 此页面尚未翻译，以英文显示。


Main screen overview
 
![image description](../_images/1756291072497-Main-Streen-with-labels.webp)
The main operating screen for the MFFT instrument will look like the above. In this example range 3 has been selected but the instrument is not set to start achieving target temperature.

To change the target range, press the back or return button  
![image description](../_images/1756291111710-back.webp)
 
![image description](../_images/1756291187457-range-select.webp)

Press the left of right arrow buttons to cycle through the range options.     

![image description](../_images/1756291159526-arrow-L.webp) 

![image description](../_images/1756291163958-arrow-r.webp)

The MFFT instrument has 10 operating ranges. Range 0 – 9. Target Cold end and Hot end for each range is shown in the table below.

![image description](../_images/1756291299155-Temperature-ranges.webp)


When the desired range has been selected use the tick button to confirm the selection.  
![image description](../_images/1756291348921-tick.webp)

![image description](../_images/1756291388472-operating-screen.webp)
 
With the desired range has been selected press the play button. 
![image description](../_images/1756291429299-play.webp)
The heating and cooling process will start.

The play button will change to a pause button.
![image description](../_images/1756291435845-pause.webp)
Pressing the pause button will stop the heating and cooling process.
 
When the target temperature is reached the thermometer outline will turn green, indicating correct temperature. 

![image description](../_images/1756291727315-operating-screen-ready.webp)
An audio system ready beep will also sound. To mute the audio alert the speaker icon can be pressed. 

![image description](../_images/1756291752647-sound.webp)
 
Pressing the right-hand double arrow button will progress to the next screen. ![image description](../_images/1756291792403-forward.webp)

The plate temperature will continue to maintain at the set points. The sample to be tested can now be placed on the test pattern. 

> [!tip] For sample application, see [Applying the Sample](rhopoint-mfft-applying-the-sample.md).

 ![image description](../_images/1756291981363-result-screen.webp)
The screen will now show the hot and cold set points and the MFFT point.\
When the sample has dried, move the cursor to the MFFT point. 

![image description](../_images/1756292030768-test-bed-with-sample.jpg) 

When the cursor is at the correct position press the tick button to accept the values.  
![image description](../_images/1756291348921-tick.webp)

> [!note]
> The tick button will only be available if the MFFT instrument is at the correct temperatures for the range selected.

 ![image description](../_images/1756292118693-results.webp)

The results of the test are displayed on the screen.

Press the return button to exit back to the main range stabilization screen.  
![image description](../_images/1756291111710-back.webp)
 
Press the save button to export the results to a CSV file.  
![image description](../_images/1756292154168-save.webp)


A csv file will be saved on a USB drive if inserted. The USB port is on the rear of the instrument.


**Example of the CSV file**

Serial Number,MFFT123456\
Date,21 Aug 2025\
Time,13:52\
Range,9\
Cold,63\
Hot,90\
MFFT Point,72

> [!tip] The file is a comma-separated CSV.