7CT1N: Difference between revisions

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* [http://w140.com/smb/7ct1n_sm.pdf Tektronix 7CT1N Manual (OCR, PDF)]
* [http://w140.com/smb/7ct1n_sm.pdf Tektronix 7CT1N Manual (OCR, PDF)]
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The '''Tektronix 7CT1N''' is a [[curve tracer]] plug-in for [[7000-series scopes]].   
The '''Tektronix 7CT1N''' is a [[curve tracer]] plug-in for [[7000-series scopes]].  The [[5CT1N]] plug-in for [[5000-series scopes]] is very similar.
 
It can be installed in either a vertical or a horizontal compartment, a front-panel switch must be set accordingly.   
It can be installed in either a vertical or a horizontal compartment, a front-panel switch must be set accordingly.   
A pull-out cable with a plastic BNC plug connects to the input of a module installed in the corresponding  
A pull-out cable with a plastic BNC plug connects to the input of a module installed in the corresponding  
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==Common Problems==
==Common Problems==


C30 and C32 (100 μF, 25 V) have a tendency to leak or short,  
C30 and C32 (100 μF, 25 V) [http://hakanh.com/dl/docs/hardtofind/CT1N.pdf are under-rated] and therefore have a tendency to leak or short,  
causing associated resistors R30 and R32 (240 Ω, .25W, 5%) to overheat and fail.  
causing associated resistors R30 and R32 (240 Ω, 0.25W, 5%) to overheat and fail. C30 and C32 should be replaced with modern equivalents rated at 63 V.  
 
A good preventive maintenance procedure would be to
replace these two capacitors with modern equivalents.
Three 7CT1N units purchased online had this fault,
and replacement of the capacitors and resistors restored proper operation.


==Prices==
==Prices==
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<gallery>
<gallery>
File:tek-7ct1n-front.jpg | 7CT1N front
tek-7ct1n-front.jpg | 7CT1N front
File:tek-7ct1n-left.jpg  | 7CT1N left side
tek-7ct1n-left.jpg  | 7CT1N left side
File:tek-7ct1n-right.jpg | 7CT1N right side
tek-7ct1n-right.jpg | 7CT1N right side
File:7ct1n-bc337.jpg    | 7CT1N tracing a BC337
7ct1n-bc337.jpg    | 7CT1N tracing a BC337
</gallery>
</gallery>


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