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bnc to trs

Discussion in 'General Electronics Discussion' started by siggy, Mar 4, 2012.

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  1. siggy


    Mar 3, 2012

    I have an function generator android app. I want to conect to a osciloscope to see if want I request is true and useful or a gimmicky waste of time!

    I assume l/r or +/- to centre pin of bnc and gnd to outer ring
  2. shrtrnd


    Jan 15, 2010
    I believe your assumption is correct.
    I'm going to give you a warning in case you need it.
    There are 50 ohm and 75 ohm BNC connectors, and there are a few different sized
    pins for some of those center pins.
    50 Ohm BNC's are very common, but it pays to match to your mating connector.
    The good companies put their part numbvers on the connectors.
    I'm warning you about this because some engineer at my work bought 100 male BNC's
    and the wrong female BNC's. He had no clue there are different types of BNC's.
    He found out because of all the intermittent connections he couldn't figure-out until
    he talked to me.
  3. siggy


    Mar 3, 2012
    Yeah thanks for the warning I knew I about the differences

    Got to read the oscilloscope manual to see if it states a particular type if not make one of each bnc connectors are not that expensive
    Last edited: Mar 5, 2012
  4. shrtrnd


    Jan 15, 2010
    50 ohm is for your function generator and test and measurement circuits.
    75 ohm are for video feeds.
    I don't know your application, or your scope.
    Most scopes have 50 ohm input termination inside the scope. If you get screwy
    readings going direct from the function generator to the scope, you may need a
    50 Ohm in-line termination. I frequently have to use one going from my function generator to my DVM. My scope has a 50 Ohm input already.
    Just one more thing to be aware of when you're taking readings.
    You may or may not need it, I don't know your application.
    Good luck.
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