R: Difference between revisions
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In the grounded-emitter configuration, it provides a variable collector voltage through a collector resistor | In the grounded-emitter configuration, it provides a variable collector voltage through a collector resistor | ||
which is used to sense the collector current. It provides a base bias voltage and a base pulse signal, | which is used to sense the collector current. It provides a base bias voltage and a base pulse signal, | ||
fed to the base of the transistor through a resistor. The rise time | fed to the base of the transistor through a resistor. The base pulse is generated by a [[mercury switch]] | ||
less than 5 nanoseconds. | and its rise time is specified to be less than 5 nanoseconds. | ||
Base and collector bias conditions can be set independently. The collector signal is AC-coupled to | |||
an amplifier whose output is fed to the oscilloscope. The Type R has its own on-board low-voltage, | an amplifier whose output is fed to the oscilloscope. The Type R has its own on-board low-voltage, | ||
high-current regulated power supplies which feature germanium power transistors. | high-current regulated power supplies which feature germanium power transistors. | ||
Revision as of 11:21, 5 February 2011
The Tektronix Type R is a plug-in for 500-series scopes. It is designed to measure risetime of a NPN and PNP transistors, but it works well with FETs as well. It can operate in grounded-emitter or grounded-base configurations. In the grounded-emitter configuration, it provides a variable collector voltage through a collector resistor which is used to sense the collector current. It provides a base bias voltage and a base pulse signal, fed to the base of the transistor through a resistor. The base pulse is generated by a mercury switch and its rise time is specified to be less than 5 nanoseconds. Base and collector bias conditions can be set independently. The collector signal is AC-coupled to an amplifier whose output is fed to the oscilloscope. The Type R has its own on-board low-voltage, high-current regulated power supplies which feature germanium power transistors.
Type R was introduced in 1958, along with the 551, 533, and 543 mainframes, and the Type H plugin. It is the first plugin with transistors. It was dropped after 1966 or 1967.
