Question about Amprobe Non-Contact Volt Probe Product ID: VP-440

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Have A non digital amprobe ultra clamp.does not read when using clamp.Can you help.It's real old.The probes work ok.has A thumb wheel with different volt,amp scales.On the side of the scale is resistance.Has A slide that locks the needle when using meter.Has no numbers what so ever.It does have A slot to calibrate the needle.

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Look for an internal fuse. I have one that's about 40 years old and it doesn't have a fuse. You could have a bad wire in the amp clamp or a corroded contact inside.

Posted on Jul 24, 2010

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When the voltage measuring is OK, are you sure you are on the correct position for Clamp AC current measuring.
If you have some positions for DC current they may be through probes, but can not be by clamp for such an old amprobe.

If every thing other is OK, but you can not use Clamp for AC current, you may have problem in the current transformer in the clamp.

I hope that this will be helpful, because I don't know exactly how your device looks like, but some people rank such an answer with 2 thumbs, which means useless. 

Posted on Jul 23, 2010

Testimonial: "Yes the only thing that works is volts using the probes.Amps and resistance will not work so probably in the unit.Wonder if I can send off for repair."

  • parlapanov Jul 23, 2010

    Thank you for the rating.
    For resistence measuring you need a battery. Is it OK.



    Some instruments use battery for other measurements too.

    Try to replace it. You may have success.

  • parlapanov Jul 25, 2010

    A wizzard can help in every situation. He will find a fuse in a clamp meter or ohmmeter  for you. When he becomes a "Guru" he may find even a gun diode in it, in order to measure microwaves!




    You can rely on his proposal for bad contact. Your clamp transformer should be shortened when not in use.

    I think you dont need help, you need a technitian or a new clamp meter.

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