Products > Test Equipment
Test Equipment Anonymous (TEA) group therapy thread
bd139:
Doesn't mean it's not going to blow up :(
I had another vendor's one blow up in a Philips scope. Hissed like an angry snake. Fortunately it was burning in with the case open on the table so I got to shut the power down before it went.
They are replace on sight "if older than 20 years" disposable parts really. We're way beyond the design life.
Might be worth checking temperature of it after an hour or so. That's a good indicator. They don't run hot unless there's something wrong with them.
Specmaster:
While playing around with my S63A signal generator yesterday my 1740A scope decided to keep your 465 company :palm: What happened, the LED for the "UNCAL" indicator on the sweep vernier failed and I thought "bastard" thinking I'd have to strip away the timebase switch cards and go through the painstaking re-alignment of the switch shafts etc.
Thankfully, just removing the 8 switch push rods (black plastic bits bent at right angles in 2nd photo) above it meant that by using a pair of long nose pliers I was able to effectively replace it. It was a bit of a squeeze with my big hands but its working OK thanks to the quirky way those push rods snap onto the switches it was relatively easy. :phew: I do like HP gear, its generally well designed and thought out in its construction.
bd139:
Yeah that construction is much better than Tek, which usually starts with "so how the hell do I get at that without having to remove the interface board" and head scratching for half an hour.
Have to be very careful with the latching changeover switches however as they get very brittle with age. I actually broke the end off the mains switch one in the 3478A when I was cleaning it and replacing the filter caps. Just literally nudged it slightly and it fell to bits. Drilled a hole through the middle of both halves with the Dremel and added a metal pin and some epoxy. Has been fine since :phew:
tautech:
--- Quote from: med6753 on May 31, 2018, 09:49:16 am ---I am confident that the EMI filter in the 2465 is not made by Schaffner.
--- End quote ---
Seems so as the mains filtering is on another PCB.
Shown here:
https://www.eevblog.com/forum/testgear/tektronix-2465b-oscilloscope-teardown/msg425034/#msg425034
med6753:
--- Quote from: bd139 on May 31, 2018, 09:53:09 am ---Doesn't mean it's not going to blow up :(
I had another vendor's one blow up in a Philips scope. Hissed like an angry snake. Fortunately it was burning in with the case open on the table so I got to shut the power down before it went.
They are replace on sight "if older than 20 years" disposable parts really. We're way beyond the design life.
Might be worth checking temperature of it after an hour or so. That's a good indicator. They don't run hot unless there's something wrong with them.
--- End quote ---
Agreed. I will check it next time I open up the scope. Which will be soon because I ordered a new power switch.
But it does appear that these units fail a LOT more often at 220V rather than 120V.
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