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181: Difference between revisions
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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 (OCXO), the CO181 (Tek part number [[158-007]]), | |||
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]]. | ||
An 181 with the OCXO mod is a "181 S1". | |||
Internally, the 181 is similar to the [[180A|180]]. | Internally, the 181 is similar to the [[180A|180]]. | ||