What's the damage threshold power for a signal generator?

Discussion in 'General Electronics Chat' started by Matjelo Naleli, Jul 18, 2016.

  1. Matjelo Naleli

    Thread Starter Member

    Oct 7, 2015
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    I have a Tektronix AFG3102 function generator with 50 Ohms output resistance and I want to drive a 5 Ohms load with it. Obviously the impedances are not matched and back-reflected power is inevitable. I could build a matching network but I just curious as to how much back-reflected power can this Function generator handle before it's damaged. I checked the manual but I couldn't get the info on this issue.

    Does any one know how much back-reflected power a typical function generator can tolerate?
     
  2. Sensacell

    Well-Known Member

    Jun 19, 2012
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    266
    The signal generator should be able to run into a dead short, that's as bad a mismatch as it gets.

    Otherwise there would be piles of dead signal generators everywhere...
     
  3. Matjelo Naleli

    Thread Starter Member

    Oct 7, 2015
    39
    0
    Alright thanks Sensacell, I didn't know that.
     
  4. Kjeldgaard

    Member

    Apr 7, 2016
    72
    16
    An excerpt from the Datasheet:

    Output impedance: 50Ω
    Load impedance setting: Selectable: 50Ω, 1Ωto 10.0 kΩ ,HighZ
    Isolation: 42 V pk maximum to earth
    Short-circuit protection: Signal outputs are robust against permanent shorts against floating ground
    External voltage protection: To protect signal outputs against external voltages use fuse adapter 013-0345-xx
     
  5. #12

    Expert

    Nov 30, 2010
    16,283
    6,795
    I smoked the 47 ohm resistor on the output of my EICO 390 signal generator many years ago.
    I don't know how I killed it, but it's possible.
     
  6. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287
    Including both of mine. :)
     
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