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Old 10th Jun 2019, 4:44 pm   #4
Dickie
Octode
 
Join Date: Sep 2004
Location: St. Albans, Hertfordshire, UK.
Posts: 1,478
Default Re: Marconi TF2430 frequency counter

I'm not sure your measurements confirm the switch is working. I would have expected a larger voltage variation. Can you measure the actual switch voltage (point"AE", or pin 1 IC8)? It should go from 0 with hold out to +5V with hold "in"
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Richard, BVWS member
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