Products > Test Equipment
Keysight 34465A reliability
alm:
Glad you caught it before another transformer died!
I'd expect a primary side fuse that blows if the instrument is using 10x more current than expected. Is there none, or is it slower than the thermal fuse at this current level?
tooki:
--- Quote from: HighVoltage on April 18, 2022, 11:15:07 am ---That definitely is a rework and looks like it was done by hand.
--- End quote ---
Nothing about that says “rework”. It’s a later PCB version where they decided, for whatever reason, to move components to a daughterboard. Since that adds cost (both for the extra PCB, but also the labor required to connect the daughterboard), they’ll have done it for some significant reason.
Soldered by hand? Probably, but not necessarily: it could also have been robotic soldering. Either way, it’s done with a soldering iron rather than wave or reflow soldering. (Yes, robotic soldering with a soldering iron is a thing.)
AVGresponding:
But apparently cleaning up flux residue is not... ::)
tooki:
It’s extremely common to find flux residue around hand-soldered (or robot iron soldered) components on boards that were otherwise wave or reflow soldered. It’s common on connectors and on assembly that isn’t just a single board.
This is a totally normal thing, yes, in commercial products.
AVGresponding:
I know, but that still doesn't make it ok
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