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| {{Plugin Sidebar
| | #redirect[[067-0066-00]] |
| |manufacturer=Tektronix
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| |series=661
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| |type=661 Vertical Test Load Unit
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| |summary=Calibration fixture
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| |image=Tek 661 vertical test load unit 1.jpg
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| |caption=Tek 661 Vertical Test Load Unit
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| |introduced=1961
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| |discontinued=(?)
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| |designers=
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| |manuals=
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| * ''please add'' [[Category:Manual needed]]
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| }}
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| The '''Tektronix 661 Vertical Test Load Unit''' is a plug-in for testing the power supplies and interconnections in a Tektronix [[661]] sampling scope.
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| It serves a similar purpose to the [[TU-4]] (for the 560-series) and [[1M1]] (for the 500-series).
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| It contains load resistors for testing the mainframe's power supply, as well as a switch for testing the wiring between the plug-in interface and the multi-pin digital output connector on the rear of the 661 mainframe.
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| There is a banana connector on the front of the plug-in that is wired to the +300 V pin on the interface connector via a fuse.
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| {{MissingSpecs}}
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| ==Pictures==
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| <gallery>
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| Tek 661 vertical test load unit 1.jpg
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| Tek 661 vertical test load unit 2.jpg
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| Tek 661 vertical test load unit 3.jpg
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| Tek 661 vertical test load unit 4.jpg
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| </gallery>
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| [[Category:Calibration fixtures]] | | [[Category:Calibration fixtures]] |