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The Tektronix Type 181 is a time mark generator [[introduced in 1955]].  There is a benchtop version,
The Tektronix Type 181 is a time mark generator [[introduced in 1955]].  There is a benchtop version,
the 181, and a rackmount version, the RM181. MOD 110 substitutes a oven-stabilized
the 181, and a rackmount version, the RM181. MOD 110 substitutes a oven-stabilized
1MHZ crystal oscillator, the CO181, thereby achieving 3 parts per million
1MHZ crystal oscillator, the CO181, thereby achieving 2 parts per million
frequency stability in a 24 hour period, the same stability as the [[180A]].
frequency stability in a 24 hour period, the same stability as the [[180A]].



Revision as of 18:04, 25 August 2011

The Tektronix Type 181 is a time mark generator introduced in 1955. There is a benchtop version, the 181, and a rackmount version, the RM181. MOD 110 substitutes a oven-stabilized 1MHZ crystal oscillator, the CO181, thereby achieving 2 parts per million frequency stability in a 24 hour period, the same stability as the 180A.