067-0508-00: Difference between revisions

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|designers=
|manuals=
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* [[Media:Tek 067-0508-00.pdf|Tektronix 067-0508-00 Manual]] (PDF, OCR)
* [[Media:Tek 067-0508-00.pdf|Tektronix 067-0508-00 Manual]] (OCR)
* [[Media:Tek 067-0508-00 schematics.pdf|Tektronix 067-0508 Schematics]] (PDF)
* [[Media:Tek 067-0508-00 schematics.pdf|Tektronix 067-0508 Schematics]]
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* [http://w140.com/tek_067_0508_00.pdf Tektronix 067-0508-00 Manual (PDF)]
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The '''Tektronix 067-0508-00''' Amplitude Calibrator generates a square-wave with two precisely controlled voltages and 50 Ω impedance at both voltages.
The '''Tektronix 067-0508-00''' Amplitude Calibrator generates a square-wave with two precisely controlled voltages and 50 Ω impedance at both voltages.


This could be achieved by a 50 Ω resistor in series with the output of an amplifier with 0 Ω output resistance (e.g., an opamp with plenty of negative feedback).  But that is not how Tektronix did it. 
The calibrator uses a 50 Ω shunt resistance at the output, and a precision DC current source that can be steered toward the output, or toward a dummy current sink transistor.   
They used a 50 Ω shunt resistance at the output, and a precision DC current source that can be steered toward the output or toward a dummy current sink transistor.   
The built-in multivibrator controls the steering of the current.   
The built-in multivibrator controls the steering of the current.   


The output is through a [[GR-874 connector]]. The [[067-0515-00|067-0515-00 precision 50 Ω terminator]]  
The output is through a [[GR-874 connector]]. The [[067-0515-00|067-0515-00 precision 50 Ω terminator]] is intended to be used with the 067-0508-00.
is intended to be used with the 067-0508-00.


==Pictures==
==Pictures==
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