Elapsed time meter

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

• 2336YA
• 490-Series spectrum analyzers Located on the A70 Z-axis & RF interface board
• 5110 Mod.WP
• 7503 – Curtis Indachron, Tek P/N 149-0030-00, run from +5 V via 3.9 MΩ. Located on rear of main interface board.
• 7904 SN B010100-B079999 – Curtis Indachron, Tek P/N 149-0030-00, run from +5 V via 3.9 MΩ. Located on rear of main interface board.
• 7L5 – Curtis Indachron, Tek P/N 149-0030-00, run from +5 V via 3.9 MΩ. Located on rear of digital storage and averaging board. Shown as M4770 on p.217 of service manual and p.95 (7-17) in parts list.
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Links

• Tek Component News No.105, May 1969 – Elapsed Time Indicator, TEK PN 149-0030-00