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| Banggood 50 ohm BNC feed-through terminator - a quick review |
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| lukier:
--- Quote from: BravoV on July 07, 2017, 06:42:16 am ---As its clear it can be opened, I guess its time to mod it with better resistors or even construction to make it better at high freq ? --- End quote --- Personally, I don't care as I only use such terminators on low end scopes that lack 50 Ohm input (Rigol DS1054Z, Micsig TO1074) and my higher performance scopes (LeCroy WaveRunner 6100A, Tektronix 2467) have 50 Ohm pathway, as IMHO every scope > 100-200 MHz should do. If you are in the RF world then it might matter, but to be honest BNC connectors are not the best for higher frequencies anyway. |
| tggzzz:
--- 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" |
| Pinkus:
--- 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) |
| CJay:
--- Quote from: Pinkus on July 07, 2017, 09:17:42 am ---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 --- I reckon that as neat as the Banggood ones are, they will suffer from just being used let alone dropped, every time it's inserted into a 'scope or has a plug inserted it'll place mechanical stress on the solder joints unless it's potted somehow and I've no idea how that might affect the frequency response. The Hameg one looks a better solution though I'd be surprised if the higher end, higher frequency ones from Fluke, Tek or Keysight are constructed that way, I'd suspect they're using something like the method used in the step attenuator here: |
| stj:
how would this compare to using a T-piece and a 50ohm terminator originally intended for networking?? |
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