Hitachi RAF-25NH4 Données Techniques page 6

(6) Use a three wire type soldering iron including a grounding wire.
Bare copper wire (for body earth)
Screw stop at the screwed
part using a rag plate
Use a high insulation mode (100V, 10M
(7) In checking circuits for maintenance, inspection, or some others, be careful not to have the test probes
of the measuring instrument shortcircuit a load circuit or the like.
Metal plate (of Al. stainless steel, etc.)
Staple
ig.3 Grounding of the working table
soldering iron
ig.4 Grounding a solder iron
or higher) when ordinary iron is to be used.
Ω
4
Working table
Resistor 1M (1/2W)
Ω
Earth wirte
Grounding wire