067-0508-00: Difference between revisions
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transistor. The built-in multivibrator controls the steering of the | transistor. The built-in multivibrator controls the steering of the | ||
current. | current. | ||
* [http://w140.com/tek_067_0508_00.pdf Tektronix 067-0508-00 Manual (PDF)] | * [http://w140.com/tek_067_0508_00.pdf Tektronix 067-0508-00 Manual (PDF)] | ||
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Image:Tek 067 0508 00-schem.jpg | Image:Tek 067 0508 00-schem.jpg | ||
</gallery> | </gallery> | ||
[[Category:Calibration fixtures]] | |||
Revision as of 10:49, 20 August 2014
The Tektronix 067-0508-00 Amplitude Calibrator generates a square-wave with two precisely controlled voltages and 50-ohm impedance at both voltages. This could be achieved by a 50-ohm resistor in series with the output of an amplifier with 0-ohm output resistance (e.g., an opamp with plenty of negative feedback). But that is not how Tektronix did it. They used a 50 ohm 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.
