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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 | ||
1 MHz crystal oscillator (OCXO), the CO181 (Tek part number [[158-007]]), | |||
thereby achieving 2 parts per million | 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]]. | ||
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So it triggers once every ten input pulses. | So it triggers once every ten input pulses. | ||
The 181 also provides a | The 181 also provides a 10 MHz output. This is generated by a 10 MHz resonator that | ||
is driven by an amplified and waveshaped copy of the 1MHz crystal oscillator output. | is driven by an amplified and waveshaped copy of the 1MHz crystal oscillator output. | ||
Since it is a harmonic, the | Since it is a harmonic, the 10 MHz output has same frequency percentage accuracy is | ||
the reference oscillator. | the reference oscillator. | ||
The power supply of the 181 produces + | The power supply of the 181 produces +300 V and -150 V regulated voltages and | ||
+ | +400 V, -8 V, and -25 V unregulated. The voltage reference is a [[5651]] tube. | ||
The output tubes for both regulators are [[12B4]] and the feedback amplifier | The output tubes for both regulators are [[12B4]] and the feedback amplifier | ||
tubes are [[6AU6]]. The 181 does not contain a fan or a [[thermal cutoff]]. | tubes are [[6AU6]]. The 181 does not contain a fan or a [[thermal cutoff]]. | ||
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[[Category:Pulse generators]] | [[Category:Pulse generators]] | ||
[[Category:Introduced in 1955]] |