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gas discharge tube indentification

Discussion in 'Electronic Components' started by Jay1028, Sep 12, 2007.

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  1. Jay1028

    Jay1028 Guest

    I have some GDTs that I can't find any info on. Here are the
    markings:

    3P90L4 - 3 leaded ceramic
    CM3-90 - 3 leaded ceramic
    CPC9119M - 3 leaded ceramic

    I would like to use them for surge protection on the cable where it
    enters the house. I plan on mounting them in a small metal box with
    f-connectors at each end. The cable is grounded to a ground rod, I
    don't know how long and was installed by the cable company with 3ft
    of 12ga wire to ground.

    If these can't be identified, how can I test them for breakdown
    voltage?

    Thanks
    Jay
     
  2. Franc Zabkar

    Franc Zabkar Guest

    I'm guessing they are 90V types. The "91" may mean 9 x 10^1.

    Anyway I found the following table in this document:
    http://www.leutron.de/uploads/media/870010_H35manual.pdf

    Table of Tolerances of popular
    Gas Discharge Arresters

    Uag/N +25%/-20% min Uag max
    -----------------------------
    230V 184V 288V
    90V 72V 113V

    Uag/N +/-20% min Uag max
    -----------------------------
    90V 72V 108V
    230V 184V 276V
    I don't know the specs for cable applications, but FWIW the above
    document has this to say about telephony:

    "The most popular gas discharge arrester is used in telephony and has
    a nominal static sparkover voltage Uag/N of 230V with tolerance range
    of +25%/-20%. The Uag measured should lie in the range from 184V to
    288V."

    - Franc Zabkar
     
  3. JeffM

    JeffM Guest

    The standard way to see the characteristics of a device
    is to put it on a curve tracer.
    http://www.google.com/images?q=Tektronix-577
     
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