Products > Test Equipment
Blew Up My First Oscilloscope!!!
Gyro:
--- Quote from: Electro Detective on March 04, 2019, 10:39:28 pm ---
Whoa :o hold up guys, there is a slight difference between X1 and X2 suppression capacitors
X2 bridge across Live and Neutral
X1 are placed in line
--- End quote ---
No, X1 capacitors are rated for L-N use, they just have a higher peak voltage withstand rating (<4kV) versus <2.5kV for X2. They tend to be used more in industrial gear and 415V three phase but it's perfectly acceptable to substitute them in if you have some around (I happen to have more X1s than X2s in my drawer).
http://www.kemet.com/Lists/Filestore/EvoxRifaRFIandSMD.pdf
https://www.allaboutcircuits.com/technical-articles/safety-capacitor-class-x-and-class-y-capacitors/
X1s won't affect filtering performance if they are the same value.
Electro Detective:
I haven't looked into it too deep (yet) and just roll with straight up same value replacements
still I don't understand why all the cap values available, and X1 and X2 voltage ratings, rather than a 'one size fits all' approach
They must have a reason for the different cap values :-//
Gyro:
In a word, cost. ;) X2s are a bit cheaper than X1s.
X1 caps are also slightly bigger physically, although they often share the same lead pitch.
Theoretically an X1 cap should last longer in a mains application as its higher withstand voltage causes it to self-heal (and hence lose capacitance) less. Hence they tend to be used more in industrial applications - though I've spec'd them in consumer gear before now.
P.S. There are also even lower rated X3 caps but I've never seen one.
PixieDust:
Well, I repaired the scope and used it a handful of times to complete a small project and then put it into cold storage. It has been sitting idle ever since then. I turned it on just now for the first time since it’s last power off almost 5 years ago now and… more magic smoke. I was hoping to use it to learn electronics on something that wouldn’t be too expensive to blow up in case I made a mistake, but it seems like I should just get a new scope when I finally move on to electronics on serious basis. I’m starting to realise that old gear is just now worth the hassle.
DavidAlfa:
Only 12 years? Rifa caps usually fail in 25yr+ equipment!
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