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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 | 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 | |||
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]]. | ||
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Image:Tek rm181.jpg|RM181 | Image:Tek rm181.jpg|RM181 | ||
Image:Tek 181 block.png|Block diagram | Image:Tek 181 block.png|Block diagram | ||
Image:Tek co181.jpg|CO181 oven-stabilized oscillator | |||
</gallery> | </gallery> | ||