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| {{Plugin Sidebar
| | #redirect[[067-0500-00]] |
| |manufacturer=Tektronix
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| |series=560-series scopes
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| |type=3M1
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| |summary=calibration fixture
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| |image=3M1_F.JPG
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| |caption=3M1 Front
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| |introduced=(?)
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| |discontinued=(?)
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| |designers=
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| |manuals=
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| * [[Media:062-0806-00.pdf|Tektronix 067-0500-00 Manual (-00)]] (OCR)
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| * [[Media:062-0806-01.pdf|Tektronix 067-0500-00 Manual (-01)]]
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| }}
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| The '''Tektronix 3M1''' (first designated the 067-050, then the 067-0050-00) is a calibration fixture for adjusting the normalizing capacitor behind the plug-in connector in [[560-series scopes | 560-Series scopes]].
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| It consists of a Schmitt trigger that is driven from a single-ended input coming from a BNC connector on the front panel.
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| The Schmitt trigger produces balanced output signals with controlled source impedance.
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| The normalizing capacitor in the scope mainframe is adjusted using a procedure similar to adjusting probe compensation.
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| When adjusted correctly, the voltage division ratio formed by the plug-in's output impedance and the mainframe's input impedance should be a real value which does not change across the specified frequency range of the scope.
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| After the scope is normalized using the 3M1, other plug-ins can be adjusted to produce clean transient response in the normalized scope.
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| Note that C131 and C136, on the printed circuit board, were set at the factory and should never be touched.
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| Each of these plugins requires 50 to 100 V square wave pulses to drive the Schmidt trigger, but only the earliest members of the [[560-series scopes | 560-Series scopes]] have a calibrator output that will go that high. The 3M1 pictured below has been modified to work with 40 V pulses. See the Repair tab for details.
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| ==067-050==
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| <gallery>
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| 067-500 1a.jpg | 067-500 Front
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| 067-500 3.jpg | 067-500 <br/> Inside Left
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| 067-500 5a.jpg | 067-500 <br/> Inside Right
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| </gallery>
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| ==067-0050-00==
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| <gallery>
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| 067-0500-00_front.jpg | 067-0500-00 Front
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| 067-0500-00_schem.jpg | 067-0500-00 Schematic
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| 067-0500-00_insides.jpg | 067-0500-00 PCB
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| </gallery>
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| ==3M1==
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| <gallery>
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| 3M1_F.JPG | 3M1 Front
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| 3M1_PCB.JPG | 3M1 Circuit Board <br/> (note added resistor)
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| 3M1_SCH.JPG | 3M1 Schematic <br/> (added resistor on the left)
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| </gallery>
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| [[Category:Calibration fixtures]] | | [[Category:Calibration fixtures]] |
| [[Category:560 series plugins]] | | [[Category:560 series plugins]] |