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| HP/Agilent 34970A Teardown |
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| coldframe:
Thanks, free_electron! Now, one question. Please take a look at the attached photo. It's probably 34902A 16-Channel Multiplexer I'm not sure what to do about it. What's this do? coldFrame. |
| free_electron:
that is a structure to test the capacitive coupling between layers. there is one of these on every layer. the top two testpoints are top layer, the next are inner 1 and so on. they used this to find out how much cross coupling there is between signals. |
| coldframe:
It come to me about Humidity Sensor :palm: BTW thanks for letting me know. |
| PTR_1275:
--- Quote from: free_electron on January 12, 2017, 04:08:59 pm ---that is a structure to test the capacitive coupling between layers. there is one of these on every layer. the top two testpoints are top layer, the next are inner 1 and so on. they used this to find out how much cross coupling there is between signals. --- End quote --- I had seen this on my cards, but not given much thought as to what it is or why it's there. Makes sense once it's explained. Thanks |
| DoricLoon:
Hi free_electron, I've just purchased a Keysight 34970a. Was listed as parts on ebay with error 625. Should be arriving in the next day or two. I have seen one thread where low battery voltage was being linked to this error? (I should be so lucky) Just wondered if you have had any dealings with this particular error? Service manual tells me lack of communication between main processor and outguard processor. I'm hoping for faulty 5V earth reference supply, reset or opto isolator problems. If it is the outguard processor will I be able to obtain a replacement? or have I spent £140 on a door stop? Thanks in advance Jim |
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