Making a 60 mhz Ref

Discussion in 'General Electronics Chat' started by Dr.killjoy, May 14, 2016.

  1. Dr.killjoy

    Thread Starter Well-Known Member

    Apr 28, 2013
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    I working on calibrating a oscilloscop.. I need a calibrated 60 Mhz and can this be made with basic parts and skills ???
    Could you use a gps reference ???
     
    Last edited: May 14, 2016
  2. bertus

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  3. Dr.killjoy

    Thread Starter Well-Known Member

    Apr 28, 2013
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    Sorry I meant 60 Mhz and I am trying to output a sine or square wave to check the calibration of my Tek 2215.. The scopes max is 60 Mhz and it doesn't have to be 60Mhz but hopefully pretty close..
     
  4. bertus

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  5. dl324

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    You need many frequencies to calibrate a scope. A time mark generator is usually used.
     
  6. Dr.killjoy

    Thread Starter Well-Known Member

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    I have a DDS and signal generator and plus I picked up a Heathkit IG-4504 scope calibrator..
     
  7. bertus

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    Hello,

    The german site box73.de has a kit to make an IQ-DDS generator:

    IQ-DDS_generator.jpg

    The SMD parts are already mounted.

    Bertus
     
  8. dl324

    Distinguished Member

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    A time mark generator makes it easier to calibrate the timebase; it's listed as required equipment in the 2215A service manual.

    upload_2016-5-14_12-7-56.png
     
  9. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    What kind of project do you plan to work on that will require such a precisely calibrated scope?
     
  10. Dr.killjoy

    Thread Starter Well-Known Member

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    I should probably explain myself a little clearer.. This scope turned on when I got it and never showed a signal when terminated cause the input resistors where shot.. After alot of help form the yahoo Tektronics group I figured a couple more issues and possible upgrades to the trigger system.. I just trying to make sure the scope is use able and somewhat calibrated ..
     
  11. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    XTEST.gif Get some crystals and build a little osc to plug them into...
    Check your scope at three or more freq
     
  12. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Do you want to calibrate the time base, or the amplitude at that frequency? Note that the bandwidth is usually up to the -3dB point.
     
  13. RichardO

    Well-Known Member

    May 4, 2013
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    You are better off verifying the bandwidth by using a squarewave. This will also show if there is overshoot or ringing in the vertical amp.

    The relationship of bandwidth to risetime is 0.35/risetime. For example, a 10 MHz scope has a 35 ns risetime. The risetime of the squarewave must be much less than the risetime of the scope for this to be accurate.
     
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