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Revision as of 14:00, 16 May 2011

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partial rewrite, explain purpose, add history
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The Tektronix Type P plug-in is a step response calibrator [[introduced in 1959]] for [[500-series scopes]].   
The Tektronix Type P plug-in is a calibration aid [[introduced in 1959]] for [[500-series scopes]].   
It applies a step signal to the vertical input (plug-in connector pins 1 and 3) of the scope.   
It applies a fast (4 nanosecond risetime) voltage step to the mainframe vertical amplifier, via plug-in connector pins 1 and 3.  It's used when adjusting the peaking coils and the delay line.   
The step is generated by a [[mercury switch]] in the Type P and it has a 4 nanosecond risetime.   
The Type P is designed to simulate a perfectly-adjusted Type [[K]] plug-in being driven by a Type [[107]] square-wave generator.  The idea is to calibrate a mainframe using Type P, then use this mainframe and a 107 to calibrate other plug-ins.
The Type P is designed to simulate a Type [[K]] plug-in being driven by a Type [[107]] pulse generator.   
In this sense, it is designed to act as a standard, not as an ideal square pulse source. 
Why is this preferable to calibrating the mainframe using a square pulse? 
Would the high-frequency components of a square pulse cause problems?
 
The Type P was the only new plug-in for [[introduced in 1959|1959]], unless you count the upgrade
from Type 53/54[[C]] to Type [[CA]].  It was dropped after 1963.


The Type P does not contain any tubes, transistors, or tunnel diodes.  
The Type P does not contain any tubes, transistors, or tunnel diodes.  
It does contain a [[selenium rectifiers|selenium rectifier]].  
It does contain a [[selenium rectifiers|selenium rectifier]] and a [[mercury switch]].  
The selenium rectifier in the Type P has four sections and full-wave rectifies
The selenium rectifier in the Type P has four sections and full-wave rectifies
the 6.3 VAC that is supplied by the scope mainframe on pins 13 and 14.   
the 6.3 VAC that is supplied by the scope mainframe on pins 13 and 14.   
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constant component in the magnetic field to bias the switch contacts to the
constant component in the magnetic field to bias the switch contacts to the
best operating point.
best operating point.
The Type P was the only new plug-in for [[introduced in 1959|1959]], unless you count the upgrade
from Type 53/54[[C]] to Type [[CA]].  It was dropped after 1963, replaced by the [[TU-7]].


* [http://bama.edebris.com/manuals/tek/p/ Tektronix Type P Manual (PDF)]
* [http://bama.edebris.com/manuals/tek/p/ Tektronix Type P Manual (PDF)]
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