LINK TO MEASURING VI

LINK TO RESPONDING VI

LINK TO RUNNING

Introduction

In order to measure the amount of liquid helium in the system at any given moment, a user interface with the platform LabVIEW is needed. The level of liquid helium is controlled by the position of the run valve, which allows it to flow from the separator to the nose (for more information on this process, follow THIS LINK    and find Low Temperature: Cryogenics). The run valve has can have any position between 0 and 3 "turns", with 0 being completely closed and 3 being completely opened. LabVIEW is used to provide a means of automatically measuring and responding to the helium level inside the tank. This is done by running two separate Virtual Interfaces in unison, a Measuring VI and a Response VI.

• talk about the main functions of the two VI's already created

ppl who need to modify the code, and ppl who just need to run it in order to get the fridge working.

Measurement VI

Interface

Code

• explain

Response VI:

Interface

Code

• explain
• understand all the sections
• visas

Running the VIs

• Power Supply Box
• Step Motor Driver
• indications on Paul's VI
• equations on mine