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Banggood 50 ohm BNC feed-through terminator - a quick review
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TheSteve:
I also tried it with a BNC T, it doesn't change it too much. Sorry I didn't grab a screen capture.
bjcuizon:

--- Quote from: Pinkus on July 07, 2017, 09:17:42 am ---
--- Quote from: tggzzz on July 07, 2017, 07:37:59 am ---
--- Quote from: bjcuizon on July 07, 2017, 04:48:44 am ---I also wonder why tek/hp feedthru terminators can cost much. Are we paying for the name brand it has? Or does it have really really high quality parts used?

--- End quote ---

You are paying to avoid wasting your valuable time, by avoiding "surprises". The surprise in the first message is easy to spot, but you can waste a lot of time/effort with more subtle and/or intermittent faults.

"No DP manager lost their job because they bought IBM", and "no EE lost their job because they bought HP/Agilent/Keysight/Tek"

--- End quote ---
I wonder how a feed through terminator from a high brand will be constructed.
If you look at this picture
https://www.eevblog.com/forum/testgear/banggood-50-ohm-bnc-feed-through-terminator-a-quick-review/?action=dlattach;attach=329772;image
it is easy to see: you just have to accidentally drop it once (maybe it already was during shipping) and you can never be sure if each of the fragile resistors will have survived this, or if -due to the mechanical shock- there are micro cracks somewhere which will result in unpredictable results ... now or in a year from now.
Are Fluke, Tektronix or Keysight feed-through terminators using the same construction? Any volunteer with a jab saw? >:D
Though I remember that a Hameg (=Rohde & Schwarz) terminator was not much different  (https://www.mikrocontroller.net/attachment/98198/HZ22.jpg)

--- End quote ---

Will tiny cracks in smd resistors cause increase/decrease of the resistor's performance over time? I have this 100R 2512 with a tiny crack which can be seen using a magnifying glass...does this matter?
tautech:

--- Quote from: bjcuizon on July 09, 2017, 04:32:59 am ---Will tiny cracks in smd resistors cause increase/decrease of the resistor's performance over time?
--- End quote ---
With any compromise of a component's envelope you can be assured the the outcome will be terminal but you never know when.


--- Quote ---I have this 100R 2512 with a tiny crack which can be seen using a magnifying glass...does this matter?
--- End quote ---
If you can remember exactly where it is in the years to come and the part is not mission critical, it might not matter much. If you want to forget all about it and ensure reliability.......replace it.
Sometimes this old saying serves and guides us well:
First cost = last cost.
bjcuizon:

--- Quote ---If you can remember exactly where it is in the years to come and the part is not mission critical, it might not matter much. If you want to forget all about it and ensure reliability.......replace it.
Sometimes this old saying serves and guides us well:
First cost = last cost.

--- End quote ---
Alright, good point right there!

Well, it was a thick film resistor. I researched about its construction and composition and the top layer is glass, so maybe the tiny crack was just on the glass/primary coating.
tautech:

--- Quote from: bjcuizon on July 09, 2017, 05:42:35 am ---
--- Quote ---If you can remember exactly where it is in the years to come and the part is not mission critical, it might not matter much. If you want to forget all about it and ensure reliability.......replace it.
Sometimes this old saying serves and guides us well:
First cost = last cost.

--- End quote ---
Alright, good point right there!

Well, it was a thick film resistor. I researched about its construction and composition and the top layer is glass, so maybe the tiny crack was just on the glass/primary coating.

--- End quote ---
Which has likely compromised the envelope.  ;)
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