181: Difference between revisions

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148 bytes removed ,  18 July 2015
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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,
these pulse width ratio of one stage to the next is 1:10.
the pulse width ratio of one stage to the next is 1:10, i.e. when a stage triggers  
The result is that when a stage triggers on a pulse at its input, it propagates
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.  It does this by time,
nine pulses (by time, not by counting).
not by counting.  After a stage returns to its resting state, it is triggerable again.
So it triggers once every ten input pulses.


The 181 also provides a 10 MHz output.  This is generated by a 10 MHz resonator that
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 1 MHz crystal oscillator output.
Since it is a harmonic, the 10 MHz output has same frequency percentage accuracy is
Since it is a harmonic, the 10 MHz output has same relative frequency accuracy as
the reference oscillator.  
the reference oscillator.  


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

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