What are “standard” reed switch test coils?
It is best to consult the reed switch manufacturer for this information as some use their own version. EIA/NARM RS-421-A Standard Test Coils (MIL-S-55433):- (second value is approx. Gauss for 10 mA) Coil I : .409″ long, .156″ ID, 5,000 turns of # 46:- 60.5 Coil II : .750″ long, .170″ ID, 10,000 turns of # 48 (MIL-A):- 66.0 Coil III: 1.00″ long, .300″ ID, 10,000 turns of # 41 (MIL-B):- 49.5 Coil IV: 2.00″ long, .300″ ID, 10,000 turns of # 39 (MIL-C):- 24.7 Hamlin uses the coils listed in the Moskowitz book, all are wound on a nylon coilform .25 in. dia. x 2.00″ long. (Second value is approx. Gauss for 10 mA) Coil 1: 3,000 turns of # 33:- 7.4 Coil 2: 3,600 turns of # 34:- 8.9 Coil 3: 4,400 turns of # 35:- 10.9 Coil 4: 5,000 turns of # 36:- 12.4 Coil 5: 6,000 turns of # 37:- 14.8 Coil 6: 7,000 turns of # 38:- 17.3 Coil 7: 9,000 turns of # 39:- 22.3 Coil 8: 13,000 turns of # 40:- 32.2 Coil 9: 15,000 turns of # 42:- 37.1 Coil 10: 25,000 turns of # 44:- 61.8 Hamlin specific coils L-4988: 2.1
