A220 Measurement Card

This is the quick live-reading card for the highest-value A220 utility-path, OCV, and current-path splits.

Use This Card When

arc performance is weak only at the top end
rod behavior is poor but the machine powers normally
clamp, holder, or plug heating may still be the whole complaint

Prove First

stable 208/230 V class input source, ideally a strong 50 A supply for top-end proof
known-good clamp and holder path
dry rods and clean steel baseline with 7018 or 6010/6011 class rod

Fast Measurement Card

Checkpoint	Where to measure or observe	Healthy expectation	If abnormal, keep diagnosis in...
Input supply at machine	at the machine input under attempted load	stable 208/230 V class input	utility path
OCV at output studs	output studs with the machine healthy	about 74 V class OCV	output or current-path branch
Clamp, holder, or plug temperature under load	live short-weld observation	no rapid abnormal heating	current path
Top-end arc feel	short higher-load proof weld	stable field-inverter behavior when fed correctly	utility or current-path branch
Yellow protection light at higher load	live observation during short heavy proof weld	stays off in normal proof welding	cooling, fan, or real source-strength branch
Stock holder and clamp path	after short proof weld on fitted 5 ft AWG #4 leads	stays electrically stable without fast abnormal heat	external current path

Official Parts Shortcuts

Use these only after the readings prove the complaint follows the clamp, holder, or utility-side accessory branch.
A220 accessories path: official A220 accessories path
Stock holder KAA20410: official product page
Heavy-duty holder 07000460: official product page
Heavy-duty clamp 07000461: official product page

Stop Rules

Stop if a better outlet or shorter cord changes the complaint.
Stop if the machine is being evaluated as TIG, because A220 is officially not recommended for TIG welding.
Stop if current-path heating clearly explains the failure.
Stop using the card and open the full guide if utility, current-path, and output evidence still overlap.

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