Elapsed time meter

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Curtis elapsed time meter (149-0030-00) in a 7503 scope
Elapsed time meter on A70 board in a 2794 spectrum analyzer

Some Tektronix instruments up to the late 1980s contained electrochemical elapsed time meters based on the Mercury coulometer principle.

In case of disposal, this component will need to be handled according to local regulations dealing with parts containing mercury.

Instruments known to contain mercury-based elapsed time meters are