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HP 33120A with bad rotary encoder
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Topic: HP 33120A with bad rotary encoder (Read 1982 times)
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JJalling
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HP 33120A with bad rotary encoder
«
on:
April 29, 2017, 10:35:45 am »
Hello all,
I have an old HP33120A with a bad rotary encoder. Does anyone know what encoder can be used as a replacement? I would think that it's not worth the effort to try to clean the existing one.
Thanks in advance
BR Jonas
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amspire
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Re: HP 33120A with bad rotary encoder
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Reply #1 on:
April 29, 2017, 11:54:09 am »
If the contacts are not damaged, it is often worth having a go rejuvinating the rotary encoder. It may involve pulling the encoder apart. I have had success with this 2 part Deoxit products:
http://store.caig.com/s.nl/it.A/id.2299/.f
but you may be able to find an alternative locally.
I had the same problem with my 33120A and Rigol DS1052E scope and both have worked for years without a problem since. I cannot remember the specifics of repairing the 33120A - sorry.
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HighVoltage
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Re: HP 33120A with bad rotary encoder
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Reply #2 on:
April 29, 2017, 12:29:24 pm »
Bourns makes a rotary encoder with same footprint.
The part number is:
PEC16-4215F-N0024
I have used a few of these successfully.
https://www.digikey.com/product-detail/en/bourns-inc/PEC16-4215F-N0024/PEC16-4215F-N0024-ND/3534275
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There are 3 kinds of people in this world, those who can count and those who can not.
JJalling
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Re: HP 33120A with bad rotary encoder
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Reply #3 on:
April 29, 2017, 01:02:32 pm »
Thank you both of you. I will give it a quick clean, and add a couple of the ones that HighVoltage suggests to my next order.
Again, thanks.
BR Jonas
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