@lewm @ghdprentice
I found the box in which my most recent Zerostat 3 came. Here are the instructions:
Hold Zerostat about 300mm (12 inches) away from the object. Squeeze the trigger slowly; a powerful stream of positive ions projects over a spread about 400mm (16 inches). Release it slowly, and negative ions are produced.
I also found the box for an original Zerostat that no longer works. Its instructions read:
(1) Hold the pistol 250 to 500mm (10 to 20 inches) from the surface to be treated, pointing directly at it.
(2) Slowly squeeze the trigger, taking about two seconds to do so. Positive charges thus produced will neutralize any local negative charges.
(3) After a pause of two seconds, slowly release the trigger, again taking about two seconds. Negative charges produced by this action will neutralize positive surface charges.
(4) Large, heavily charged areas may require several operations for complete neutralization.
In these instructions for the original Zerostat, there are further notes, including:
Too rapid operation of the trigger may cause an internal sparking which is indicated by an audible "click." This does no damage to the Zerostat but will limit the amount of ions produced during the operation. Occasionally, the "click" may sound during normal slow operation but should be ignored.
Use of elaborate electrostatic measuring equipment shows that Zerostat discharges a phonograph disc best when the final "motion" is a trigger squeeze, and the trigger is then released pointed away from the disc.
NOTE: Records may be treated whle on the turntable, but due to the earthed platter, a "tabled" disc may need three-to-five squeeze/release operations.
(For those who don’t know, "earthed" is how the British say "grounded.")
So those notes from the original Zerostat may account for the method I’ve used, since I’ve generally used it with the LP on the turntable. But I think the Zerostat 3 I have works fine with the later instructions, at least when holding the LP by hand.