current clamp

dear all

 i am interesting to buy a current clamp to use it for vibration analyzer by bnc connection to perform high voltage current  signature motor analysis .

pls suggest applicable clamp by model and its brand.

best regards 

Original Post

If you are doing current signature analysis, I would say you can use any clampon probe that

1 - has a high enough range (typically 5A if you are monitoring the secondary circuit of ct's)

and

2 - has a spec for output voltage per input current (you don't want output current).

You'll need to go into your vibration software and select the proper scaling (millivolts per amp) for the sensor you are using. If you are reading off ct secondary you can also set up the scaling so that everything displays in ct primary units… (it's a matter of preference).

electricpete posted:

If you are doing current signature analysis, I would say you can use any clampon probe that

1 - has a high enough range (typically 5A if you are monitoring the secondary circuit of ct's)

and

2 - has a spec for output voltage per input current (you don't want output current).

You'll need to go into your vibration software and select the proper scaling (millivolts per amp) for the sensor you are using. If you are reading off ct secondary you can also set up the scaling so that everything displays in ct primary units… (it's a matter of preference).

thanks in advance

I have not seen a product on the market that meets the OP requirements. Most of the current clamp-on transformers that I have seen with voltage output do not provide a dynamic signal. Be sure to check the specifications. I made my own set up from a standard Fluke clamp-on current transformer with a small interface box containing a resistor and BNC output connector.
Walt

I'm not sure what you're referring to, but should be easy to judge from the spec sheet.  If it lists a scaling with some output millivolt AC per input amps ac, then I'd consider it dynamic.  If it talks about hooking up to oscilloscopes or gives a frequency range that gives further confirmation

The probe we used is from Omega and labeled  HHM42.

I couldn't find a spec sheet on that particular model, but but looks like any of these in the Omega HHM70 series linked below would work as long as your measured current is within the range listed:

http://www.omega.com/temperature/pdf/HHM70.pdf

 

 

 

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