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

These work great and they measure out right at 50 ohms. Great deal. I ended up grabbing a few, just so I'd have them.

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.

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.

It works as specified.

These are an inexpensive and high quality way to terminate your connections into your oscilloscope or other test equipment at 50 ohms. I prefer these to using my internal 50 ohm resistors in my oscilloscope just in case I go over voltage. I'd rather burn one of these than the front end of my very expensive scope! These actually have a decent low power rating. I view it has cheap insurance!

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.

I had difficulty mounting and Unmounting. I looked closer using a magnifier and the slot for the BMC isn’t cut precisely. I had to use a dremel and… it still isn’t perfect. I wouldn’t buy it again

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.

廉価にオシロスコープ用のフィードスルー型の50 ohm ターミネーターが入手できて良かったです。 ちゃんと使えます。