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Author Topic: Tektronix 2445B vertical problem (solved)  (Read 1826 times)

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Offline mmasedaTopic starter

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Tektronix 2445B vertical problem (solved)
« on: October 02, 2016, 08:10:36 pm »
I was using my 2445B today and noticed that when using the vertical position knob that the amplitude of the waveform gets larger as it is moved towards the bottom of the display.  This happens on both channels 1 and 2 but not on 3 and 4.  See attached pictures.  Any ideas what the problem is ?

« Last Edit: October 03, 2016, 03:12:30 pm by mmaseda »
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Offline Orange

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Re: Tektronix 2445B vertical problem
« Reply #1 on: October 03, 2016, 06:56:53 am »
I would start by checking the power supplies first. If that is within reasonable limits. You probably have a faulty channel switch hybrid
U400, 155-0236-00
It's a common malfunction in the 2445/2465 series.
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Offline mmasedaTopic starter

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Re: Tektronix 2445B vertical problem
« Reply #2 on: October 03, 2016, 01:45:55 pm »
U400 was the problem.  Thanks !!!!
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