the test is to take a working LEC from air, to full vacuum, and then back inyo a hydrogen atmosphere. A good result would be - some voltage in air, no voltage in vacum, a higher voltage in hydrogen.
That does sound like a good test. Based on cold fusion experiments, I think you should hold it in each condition for a day or so. I do not know if this has anything to do with cold fusion, but if it does, it may take a while for the effect to go away in a full vacuum.