Cheap good ways to measure into the high mHz to low ghz range?

Discussion in 'General Electronics Chat' started by jarwulf, Dec 4, 2015.

  1. jarwulf

    Thread Starter Member

    Jul 7, 2013
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    Hi I'd like to measure waveforms ranging from the low ghz to mhz range. Unfortunately almost all the oscilloscopes I've looked at seem to only go up to 50mHz to 100mHz before becoming prohibitively expensive. At least I'd like something that could go up to around 200mHz. Would a chinese USB scope like this

    http://www.ebay.com/itm/HDSO-100-50...020637?hash=item1c56c7d35d:g:0RcAAOxycmBSp~13


    be a good deal?

    It claims to have a bandwidth of 100MHz - 349MHz. Does that mean it can't measure below 100mhZ?

    Should I get a spectrum analyzer instead to measure into that range? Even though those seem even more expensive. Is their any other alternative type of instrument that I could substitute?
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,645
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    Hello,

    If you are not interested in the shape of the signal, but only its frequency, you could have a look at a frequency counter.

    Bertus
     
  3. Papabravo

    Expert

    Feb 24, 2006
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    You just don't understand the complexity of measuring anything at those frequencies. To be a lone RF Engineer requires equipment more valuable than most people's houses. Short of winning the lottery, you might have some luck on eBay or one of the rental companies. Most of the stuff coming off rental is in pretty tough shape however. At those kinds of prices it is easy to get taken as well. Last option is to cultivate an FAE who might tip you off to somebody getting rid of a piece of equipment on the cheap.
     
  4. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
    2,780
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    If you don't require storage, new/NOS readout CRO's having half-power bandwidths of 500MHz are available for ≤ $8k --- they'll last a lifetime in skilled hands!:):):)

    Best regards and good luck
    HP
     
  5. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
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    Not many people come to terms with extremely low frequencies, are you really sure you are talking about milli Hertz (mHz) and not about Mega Hertz (MHz)?
     
  6. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    As an aside -- unless you are analyzing transients, waveform characteristics (i.e. harmonic content, etc...) at VHF and above are better (and more economically) examined via an SA (AKA -- at risk of appearing pedantic --a frequency domain oscilloscope)...

    Best regards
    HP:)
     
  7. Aleph(0)

    Member

    Mar 14, 2015
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    HP Is $8,000 cheap?
     
  8. Aleph(0)

    Member

    Mar 14, 2015
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    HP If you are meaning rise and fall times when you say transients I say spectrum analyzer ok for that too! Is less intuitive for that purpose but you can save a lot of money:)
     
    Last edited: Dec 5, 2015
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  9. Papabravo

    Expert

    Feb 24, 2006
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    If he was talking about low frequencies the terms would be millihertz, microhertz, nanohetrz, and picohertz. I think the OP/TS like many text speakers can't be bothered to use the shift key. I guess we won't be getting to Mars anytime soon.
     
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  10. Papabravo

    Expert

    Feb 24, 2006
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    To an RF Engineer it is peanuts. To the rest of us maybe not so cheap.
     
  11. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    For 500MHz bandwidth!? -- Dirt cheap!

    I respectfully submit that "expensive vs. inexpensive" is relative to the product -- not the parsimony of the purchaser!:rolleyes: --- Should one fail to regard proper instruments as worth their FMV then their 'heart' is not in their work/avocation -- my $.02

    Best regards
    HP:)
     
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  12. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    I think Papabravo said it a million times better.
     
  13. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    Respectfully $8K is a great price for the described scope whoever the purchaser... If I seemed to be taking issue with @Papabravo 's comment - I apologize - that was not my intent!:rolleyes:

    Best regards
    HP
     
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