149-0030-00

Curtis elapsed time meter (149-0030-00) in a 7503 scope. The device pictured here is no longer functional.

The Curtis Indachron  (P/N 149-0030-00) is a mercury coulometer (elapsed time meter).

Data

• Scale: 0-5000, 6 major, 20 minor marks.
• Operating Current:
  • 1,000 hours at 6.5 μA DC
  • 2,000 hours at 3.2 μA DC
  • 5,000 hours at 1.28 μA DC
  • 10,000 hours at 0.65 μA DC
• Temperature Range : Operating −38°C to +70°C / Storage −38°C to +70°C

The typical connection is via 3.9 MΩ from regulated +5 V for 1.28 μA (5,000 hours).

Some instruments using part 149-0030-00

Instrument	Manufacturer	Class	Model	Description	Introduced
7503	Tektronix	Oscilloscope	7503	90 MHz non-storage mainframe	1970
7904	Tektronix	Oscilloscope	7904	500 MHz non-storage mainframe	1971
7L5	Tektronix	Plug-in	7L5	5 MHz Spectrum Analyzer	1976

Links

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