Calibrate those instruments

This tip was a pleasant surprise on a Sunday morning. This site explains cheap and relatively easy ways of calibrating the instruments we hold so dear. Not only how, but when and why. Included are instructions on calibrating Voltage (DC and AC), frequency, RF and more.

[thanks Jan]


  1. 1000100 1000001 1010110 1000101 says:

    Good write-up.

    Some years back I found an exceptionally nice-looking rock that I now use as a measure of weight.

  2. PocketBrain says:

    We all know the why, and the when is typically yearly, but the how… if only I could get the page to open!

    BTW Dave, is your rock around 14 pounds in weight?

  3. biozz says:
  4. 1000100 1000001 1010110 1000101 says:

    No, PocketBrain, my rock IS the measure of weight.

  5. ... says:
  6. I can not get the site to open, and I have no rock :(

  7. 1000100 1000001 1010110 1000101 says:
  8. Ryan says:

    But… to get the rock, I’d have to leave my computer and venture to the outdoors 0_0

  9. ry4n says:

    But… to get the rock, I’d have to leave my computer and venture to the outdoors 0_0

  10. Osgeld says:

    yea, eventually the page did open, clicked on one of the links and …………………….

    opened the link

    I will check back later

  11. 0x4368726973 says:


    I believe that would be a stone, not a rock….

  12. strider_mt2k says:

    -how many rocks to a hogshead?

  13. Dite says:

    Yet an another dude with wrong ideas about instrumentation…
    None of those “references” are temperature compensated. So they are simply “junk”

  14. Kattayil says:

    @Dite: How do you expect to temperature-compensate an already temperature compensated atomic clock in Russia?

  15. Dite says:

    @Kattayil: I don’t think you completely get the point. The “suggested” Resistance, DC and AC references have no relation with atomic clocks and/or frequency refrences.

    Moreover “CW radio freq. ref.” idea is simply impractical.

  16. MoJo says:

    Dite, did you even read the site? It clearly says these are cheap and easy ways to get pretty good calibration for hobbyist tools.

    If you can afford professional calibration you are not a hobbyist.

  17. Dite says:

    @MoJo: I can’t afford too. But this doesn’t mean bad ideas should encourage. What ever.. You can’t even handle a little criticism

  18. Ren says:

    @1000100 1000001 1010110 1000101
    Having a rock for a weight standard is fine, but other than relative measurement in a laboratory balance (Item measured is greater than or less than the mass of “Rock”)To what degree of precision and accuracy do you calibrate against your rock standard?

    e.g. Item = 0.9753 Rock

    How is Rock associated to other standards such as second, resistance, volume, farad, henry, volt?

  19. Ren says:

    P.S. it has been said before, but the wonderful thing about standards is there are so many of them.

  20. 1000100 1000001 1010110 1000101 says:


    0.736802 seconds = length of time required for said rock to fall from hand to big toe. Physical constant.

    Owwwm = measure of resistance in picking up said rock. Substantiated through MRI observation according to the following: 3.713 Owwwm/slipped disk.

    91 dB = sound pressure level of vocalization of 3.713 owwwms. Also note that a free fall of 0.736802 seconds to big toe will result in an SPL of 86 dB at 2.015 owwwms.

    1 Farad = 1 second/owwwm. Perceived length of ambulence ride to hospital for aforementioned MRI = 1.0E6 Farad*owwwms.

    3 Henries = number of friends needed to assist in lifting rock for a individual equivalent resistance of 0 owwwms.

    1.0 Volt…sorry, I work 3rd shift. I’m going to bed :)

  21. arunarw says:

    What is the meaning about “1010110A”…please help me..ok…..Bye….!!!

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