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HP 54124A question...

Question asked by FM on Jun 18, 2010
Latest reply on Jun 23, 2010 by ko2054

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I have a HP 54120B with a 54124a test set. Input 1 and 2 can not pass the Vertical Channel CAL. Does it mean these channel are defective? They seems to not work with a signal on it...

...I know, this is an old instrument...

Thank you

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ko2054 Jun 23, 2010 1:21 PM
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Hello FM, the 54121A, 54123A, and 54124A sets were very sensitive to ESD. Any small static discharge will blow the sampler on that channel. Even connecting a cable that was not previously discharged is enough to blow a channel input. That is because to get the high bandwidth, there is not input protection or attenuators. The inut signal is applied directly to the samplers. You can refer to your service manual for the part number and I believe it might still be available for you to order. It sounds to me like the channel 1 and 2 inputs are blown. I hope this helps.
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