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Measuring Very High Voltage — Parallax Forums

Measuring Very High Voltage

C.MoherC.Moher Posts: 35
edited 2005-12-19 16:41 in General Discussion
I purchased an infrared kit years ago and have since misplaced all the documentation for it. What I can tell you is that it takes a 9V battery and steps it up to thousands of AC volts to power the IR tube. Can anyone please tell me how I can measure this voltage·? It's obviously out of the range of my meter. Furthermore the supply is arcing on the PCB. Can you suggest, by brand name, some insulating junk ? Thanks.

Comments

  • PJAllenPJAllen Banned Posts: 5,065
    edited 2005-12-19 13:34
    FLUKE still sells a high-voltage probe that you could use with any DMM.

    or...
    HIGH VOLTAGE PROBE
    Product Details:
    The Tenma multiplier probe adapts most 10Mohm multimeters into a high voltage meter. Meets IEC1010 safety requirements.
    40KVDC or peak AC, 28KVAC RMS (60Hz)
    Division ratio: 1000:1
    Input resistance: 1000Mohm
    Accuracy:
    DC:± 1% (1KV~20KV) ±2% (20KV~40KV)
    AC: ±5% (1KV~28KV RMS, 50/60Hz)
    http://site.mcminone.com/product.asp?catalog%5Fname=MCMProducts&product%5Fid=72%2D3040

    HIGH VOLTAGE PUTTY 1 1/4 OZ. SILICONE RUBBER PUTTY
    http://site.mcminone.com/product.asp?catalog%5Fname=MCMProducts&product%5Fid=20%2D975

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    Post Edited (PJ Allen) : 12/19/2005 2:03:28 PM GMT
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2005-12-19 14:42
    These high voltage probes are common and mostly intended for measuring the HV output to Cathode Ray Tubes [noparse][[/noparse]CRT]. They can convert any DMM.

    All of this is in the realm of everyday Television Repair, so any electronics supplier that caters to that market will have a selection of probes and the high voltage putty.

    Be sure to keep everything clean when working with High Voltage.

    Dirt conducts electricty. HV attracts a lot of carbon as dirt.

    Over the years I have been given several Color TVs that had completely 'blacked out'. In every case, all I did was to wash the insides, reinsulate the HV connections, and replace the 115VAC fuse.

    Color TVs for a mere $10USD! {fuses, silicon seal, and spray cans of cleaner}.

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  • PJAllenPJAllen Banned Posts: 5,065
    edited 2005-12-19 16:41
    Here's a link to a do-it-yourselfer:

    http://members.tm.net/lapointe/High_Voltage_Probe.html

    or....

    http://cgi.ebay.com/FLUKE-80K-6-HV-PROBE-HIGH-VOLTAGE-PROBE-6KV_W0QQitemZ7573982376QQcategoryZ1504QQssPageNameZWDVWQQrdZ1QQcmdZViewItem


    Post Edited (PJ Allen) : 12/19/2005 4:48:42 PM GMT
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