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7A21N: Difference between revisions
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The 7A21N provides direct access to CRT for fast-risetime AC signals on the 500 MHz-class 7900 series scopes, i.e. [[7904]]/[[7904A]], [[R7903]], [[7934]], [[7912AD]](?) | The '''Tektronix 7A21N''' is a 7000-series plug-in that provides direct access to the CRT for fast-risetime | ||
AC signals on the 500 MHz-class 7900 series scopes, i.e. [[7904]]/[[7904A]], [[R7903]], [[7934]], [[7912AD]](?). | |||
Input signals are applied via a pair of [[GR-874]] connectors. | |||
The 7A21N is | The 7A21N is fully passive and can be wired for single-ended or differential signals internally. It includes | ||
two delay lines, two inverting "transformers" and a passive bridge and power divider. There is no trigger | |||
pick-off, this would have to be provided externally e.g. through a [[7M11]]. | |||
The 7A21N is intended to be installed in the Left Vertical bay of the 79xx mainframe and requires the mainframe's | |||
vertical amplifier board to be replaced with the 7A21N CRT Input Network and 7A21N CRT Termination boards, which | |||
are shipped plugged into the back side of the 7A21N circuit board. (A second-hand 7A21 without these boards and | |||
associated cables is useless!) | |||
Obviously, installing the replacement boards also disables the mainframe's | |||
[[7000 series readout system|readout facility]] and second vertical plug-in bay. | |||
{{BeginSpecs}} | |||
{{Spec | Deflection factor | < 4 V/Div (SE), < 2 V/Div (Differential) }} | |||
{{Spec | Bandwidth | 20 kHz – 1 GHz }} | |||
{{Spec | Input impedance | 50 Ω }} | |||
{{Spec | Max. input | 6 W avg @ 50 Ω, 200 V DC }} | |||
{{EndSpecs}} | |||
==Links== | ==Links== | ||
* http://www.barrytech.com/tektronix/tek7000/tek7a21n.html | * [http://www.barrytech.com/tektronix/tek7000/tek7a21n.html Tek 7A21 @ barrytech.com] | ||
==Pictures== | ==Pictures== | ||