ESAB Powercut 1600 Service Manual page 170

SECTION 9
10.5 Meter Use
Relay Voltage Drop as a means of voltage in circuit troubleshooting.
In all series circuits, the total circuit voltage is dropped across the load or electrical devices. The higher the
resistance of the load the higher the voltage drop. The lower the load resistance the lower the voltage drop.
An open contact in a branch circuit with a load will show a high voltage drop because the meter and the
open switch have a very high resistance when compared to the load. While a closed contact that has a me-
ter across, it shows a very low voltage drop since the resistance across the switch is lower than the load.
So, using the meter set at the proper voltage range you can test if the contacts are closed or open.
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gENERAl INfORMATION
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