In Reply to: Re: no spark posted by Bob in KS on December 14, 2018 at 10:05:49:
You are referring to the 2nd revision, original Induction or LOOP style AMMETER. It was released after the first 4000 9Ns that used the screw terminal type 20/20 AMMETER.The LOOP was just that. A metal loop was on the back of the gauge whereby the wire fed thru it, with no other connections required. It worked by basic electrical induction function. Accuracy was about ± 20%.
ORIGINAL 9N-10850-A AMMETER; 20/20 AMP, 4 SCREW TERMINAL UNIT:
OEM 30/30 AMMETER; INDUCTION/LOOP UNIT, USED AFTER S/N 9N-4000:
OEM 30/30 LOOP AMMETER & AFTERMARKET 2 SCREW TERMINAL TYPE: