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ceramic capacitors
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Here is a pondering question for you all to think on. How many of you have considered replacing (upgrade) the ceramic disc caps to a higher class 2 grade like X5R or X7R to replace all the Z5U ones used as they are the worst of the class 2 and as they deteriorate with age plus are susceptible to temp and frequency changes to capacitance so they might be responsible for the little niggling problems with the scopes over time or after repairs but it is just not right?
After all they are old and older technology and in most cases much used. Just a thought to consider. Jim |
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Chuck Harris
And yet the scope is stable enough already.
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There is an old saying: "If it ain't broke, don't fix it." -Chuck Harris Jim Olson wrote: Forgot to add that the higher class 2 have much less change to capacitance +-15% vs +20%-85% so should make the scope more stable. |
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I don't think that Z5U types are still being manufactured; I know surface mount types were phased out years ago.? Maybe really cheap disk types are still being made.??
-Dave From: Jim Olson <v_12eng@...> To: [email protected] Sent: Tuesday, July 24, 2018 3:04 PM Subject: Re: [TekScopes] ceramic capacitors Forgot to add that the higher class 2 have much less change to capacitance +-15% vs +20%-85% so should make the scope more stable. Jim |
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Yes, they are.? And, yes, they suck!
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Sent from my Verizon, Samsung Galaxy smartphone -------- Original message --------From: Dave Seiter <d.seiter@...> Date: 7/24/18 5:44 PM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] ceramic capacitors
I don't think that Z5U types are still being manufactured; I know surface mount types were phased out years ago.? Maybe really cheap disk types are still being made.?? -Dave ????? From: Jim Olson <v_12eng@...> To: [email protected] Sent: Tuesday, July 24, 2018 3:04 PM Subject: Re: [TekScopes] ceramic capacitors ?? Forgot to add that the higher class 2 have much less change to capacitance +-15% vs +20%-85% so should make the scope more stable. Jim |
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On Tue, 24 Jul 2018 15:00:00 -0700, you wrote:
Here is a pondering question for you all to think on. How many of you have considered replacing (upgrade) the ceramic disc caps to a higher class 2 grade like X5R or X7R to replace all the Z5U ones used as they are the worst of the class 2 and as they deteriorate with age plus are susceptible to temp and frequency changes to capacitance so they might be responsible for the little niggling problems with the scopes over time or after repairs but it is just not right?I haven't seen a problem where I can pin it down to one of them failing. I'm probably not as critical as others might be, though. Harvey I tend to use x5R and X7R for new designs, though.
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