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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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Each multivibrator is triggered by the output of the previous stage, and | Each multivibrator is triggered by the output of the previous stage, and | ||
cannot be triggered again for the duration of its pulse width. In the 181, | cannot be triggered again for the duration of its pulse width. In the 181, | ||
the pulse width ratio of one stage to the next is 1:10, i.e. when a stage triggers | |||
on a pulse at its input, it propagates that event to its output, but inhibits the next | |||
that event to its output, but inhibits the next nine pulses | nine pulses (by time, not by counting). | ||
not by counting | |||
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 | is driven by an amplified and waveshaped copy of the 1 MHz crystal oscillator output. | ||
Since it is a harmonic, the | Since it is a harmonic, the 10 MHz output has same relative frequency accuracy as | ||
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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<gallery> | <gallery> | ||
File:Tek 181.jpg|181 | |||
File:Tek rm181.jpg|RM181 | |||
File:181_PC_ISO.jpg|181, early version | |||
File:181_PC_Front.jpg|181, early version, front | |||
File:181_PC_Left.jpg|181, early version, left side | |||
File:181_PC_Right.jpg|181, early version, right side | |||
File:Tek co181.jpg|CO181 oven-stabilized oscillator | |||
File:Tek 181 block.png|Block diagram | |||
File:Tek 181 oscillator and multiplier.png|oscillator and multiplier | File:Tek 181 oscillator and multiplier.png|oscillator and multiplier | ||
File:Tek 181 frequency dividers.png|frequency dividers | File:Tek 181 frequency dividers.png|frequency dividers | ||
File:Tek 181-switching detail.png|switching detail | File:Tek 181-switching detail.png|switching detail | ||
File:Tek 181 power supply.png|power supply | File:Tek 181 power supply.png|power supply | ||
File:Tek rm181 1us output2.jpg|Output waveform of RM181 set for 1 us period. | |||
Tek 181 later style rounded case.jpg|Later style case, rounded corners. | |||
Tek 181 left internal on.jpg|Left internal view, powered up. | |||
</gallery> | </gallery> | ||
[[Category:Pulse generators]] | [[Category:Pulse generators]] | ||
[[Category:Introduced in 1955]] |