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The Type W is a plug-in amplifier for [[500-series]] scopes.  Has a built in precision variable voltage supply, "Vc".   
The Type W is a plug-in amplifier for [[500-series scopes]].  Has a built in precision variable voltage supply, "Vc".   
The Type W has two signal inputs, "A" and "B".  A mode switch selects between displaying A-Vc, A-B, or Vc-B.   
The Type W has two signal inputs, "A" and "B".  A mode switch selects between displaying A-Vc, A-B, or Vc-B.   
The "A-B" mode is particularly useful for displaying the current in a sense resistor,  
The "A-B" mode is particularly useful for displaying the current in a sense resistor,  

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