(6) Use a three wire type soldering iron including a grounding wire.
Use a high insulation mode (100V, 10M
9
or higher) when ordinary iron is to be used.
(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.
Bare copper wire (for body earth)
Metal plate (of Al. stainless steel, etc.)
Working table
Resistor 1M
9
(1/2W)
Earth wirte
Staple
soldering iron
Grounding wire
Screw stop at the screwed
part using a rag plate
– 2 –
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