Hioki SW1001, Instruction Manual, Page: 149 / 164

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Measuring Object Short Circuit due to Relay Contact Welding
12.2 Measuring Object Short Circuit due to Relay
Contact Welding
The SW9001 and SW9002 multiplexer modules switch a measurement signal using a mechanical
relay.
The relay contact may weld when relay switching is repeated with a large current flowing (also
when the measuring object or instrument to be connected is capacitive). When relay contact
welding occurs, the measuring object may be shorted. Periodic inspection is recommended.
Reference: "Checking for relay contact welding" (p. 26)
Example: When a battery cell is measured with the cell reversed
Selected channel
Channels not selected
Example: When each of the stacked batteries is measured
Selected channel
Channels not selected
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Appendix