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-[[File:181_PC_ISO.jpg|thumb|350px|right|181, early version]]
+{{Instrument Sidebar
-The '''Tektronix Type 181''' is a time mark generator [[introduced in 1955]].  There is a benchtop version,
+|manufacturer=Tektronix
-the 181, and a rackmount version, the RM181. MOD 110 substitutes a oven-stabilized
+|model=181
-MHz crystal oscillator (OCXO), the CO181 (Tek part number [[158-007]]),
+|class=Pulse Generator
-thereby achieving 2 parts per million
+|series=
-frequency stability in a 24 hour period, the same stability as the [[180A]].
+|summary=Time mark generator
+|image=181_PC_ISO.jpg
+|caption=181, early version
+|introduced=1955
+|discontinued=(?)
+|designers=
+|manuals=
+* [[Media:070-292.pdf|Tektronix 181 Manual]] (sn 6917, color schematics, PDF)
+* [https://w140.com/mmm/tek-181.pdf Tektronix 181 Manual (PDF)]
+}}
+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-stabilized1 MHz 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]].
 A 181 with the OCXO mod is a "181 S1".
-==Manuals ==
-* [[Media:070-292.pdf|Tektronix 181 Manual (sn 6917, color schematics, PDF)]]
-* [http://w140.com/mmm/tek-181.pdf Tektronix 181 Manual (PDF)]
 ==Internals ==
 Internally, the 181 is similar to the [[180A|180]].
 The oscillator drives a chain of synchronized monostable multivibrators.
-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.
-cannot be triggered again for the duration of its pulse width.  In the 181,
+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 nine pulses (by time, not by counting).
-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
-nine pulses (by time, not by counting).
-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 1 MHz 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 relative frequency  accuracy as the reference oscillator.
-Since it is a harmonic, the 10 MHz output has same relative frequency  accuracy as
-the reference oscillator.
-The power supply of the 181 produces +300 V and −150 V regulated voltages and
+The power supply of the 181 produces +300 V and −150 V regulated voltages and +400 V, −8 V, and −25 V unregulated.
-+400 V, −8 V, and −25 V unregulated.  The voltage reference is a [[5651]] tube.
+The voltage reference is a [[5651]] tube. The output tubes for both regulators are [[12B4]] and the feedback amplifier tubes are [[6AU6]].
-The output tubes for both regulators are [[12B4]] and the feedback amplifier
+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]].
 ==Pictures ==