MOTOKU 2X Copper Adapter 50Ohm 38.5mm Insert Type BNC Feed Through Terminator

Measured 50.8 ohms, well within tolerance and measurement error.

Please be sure to double check the value of ALL units received. I purchased four of these units. Three of them have the correct value of 50 ohms. The fourth has a value of 100 ohms (checked with a calibrated high-precision meter). Because these feed-through terminators are no longer laser etched, it is possible someone packaged the wrong one. If you didn't check each terminator, you could cause significant damage to a device under test not realizing the terminated value is not as expected. It is too much hassle to try and return this for what equates to a $5 part.Update: The seller offered a refund with no hassle without me asking. Really love customer service like that! I have two others ordered previously that are in spec. They offer great performance for price. If you can get a good pair, it is an unbeatable value.

They are of decent quality and about 2% tolerance on DC Ohms. Have not tested frequency response.Bought a second set just to have around as a lot of these out there are often junk. Absolutely needed when plugging different kits to the oscilloscope in order to avoid reflections.

These 50 ohm feed-through terminators work nearly as well as those from Pomona at less than a tenth of the cost. Measured with an HP VNA with one end open, the S11 return loss was better than -20 dB up to 680 MHz and better than -10 dB up to 1500 MHz -- and very smooth. See attached test setup photo and S11 chart. This is worse by just a few dB than the Pomona 4119-50 below 1 GHz.Note that the proper way to test a 50 ohm feed-through terminator is to leave one end open, as was done here. Don't connect it to an oscilloscope input when characterizing its performance, even if that's how it will be actually be used: above a few tens of MHz, a typical 1 Mohm (nominal) scope input's capacitance (generally around 18 pF) will dominate, and not even the best feed-through terminator in the world would look good on the VNA.

These 50 Ohm BNC(M/F) through terminations (ASIN B07G566JC7) are pretty good for the price. Of course like anything BNC I recommend you use them below 3 GHz or so. Also I'm guessing these will handle one Watt or less. I checked S11 and S21 through 2 GHz and they look OK.

50 ohms as described & appear to be well made. I deducted a star because I had to label at 50 ohms.

Swept each of these (2 in a pack) up to 1.5 GHz and they held up well. The ones I received should be usable approaching 23cm territory. These are only good for low voltages and low power applications.Really, they are only mediocre terminators. The high rating is for the bang for the buck. Haven't found any better that are not also an order of magnitude more expensive.Returned the black plastic cheap version of these as they were wildly out of claimed specification and had a very poor response on the VNA useful up to maybe 500MHz. Using those proceeds to order another set of these.

These both arrived today but I was disappointed to see they didn't have the 50 ohms marking etched on the side as pictured on the Amazon advertisement page. I gave these a lower rating due to this.Let me say that I am pleased with the measurement as they are well under the 1% tolerance when it comes to the Ohms measurement using the 4-wire measurement technique(Good).I heard about these through watching a U-Tube video while I was learning about using Termination with Signal Generators x Oscilloscopes . The gentlemen mentioned these as a inexpensive buy that worked pretty well for lite duty testing.I am only posting this review to help other understand what will show up before they order so they can make a more informed purchase decision.Just to add, I left the one that measured 50.125 Ohms on the test equipment and it has stepped up to 50.130 Ohms as I was writing this review. I guess this may be due to the temp change of the low wattage resistors that are used, but please do not take this small Ohms reading change as a negative toward the product, its just an observation that I thought was neat to see and understand why and what was going on.I hope this help someone and have a blessed day.