how to datalogg noise from 230v line

[rudr_p]

Hi,
I want to datalog a 1 phase 230v line. The cost of professional products are too high for us for this particular job. I don't want it for long life but for temporary usage.
Actually, there is a pick and place machine which goes into error mode like 2-3 times per day and we suspect that it is because of power supply but there are other device(< 1kw) which are unaffected and there is also a 23kw reflux oven connected to the same supply. The owner/customer of the device is reluctant to applying any external device (emi filter etc), the pick and place manufacturer says that the fault is not in theie device as they conducted test in harsh environment again (and they are coming in January to check this machine) and think that the owner has done something. but if there is something in the supply we would like to find that out.

 

[jiripolivka]

This may be a difficult problem to find. Best I would suggest to RENT the test equipment to get important data.
The problem may be that loading the 230 V line may bring a "slow" voltage drop, or a "fast" glitch. Each kind requires a different hardware to catch.
Maybe try first what is the that triggers the problem. Using separate phases for powering separate loads can help, too.

 

[rudr_p]

thanks , jitipolivka for your suggestion. The manufacturer will be looking in the problem directly so we are loose now.
But I am curious, how this voltage(1ph or 3ph) can be data logged or seen directly with noises ?
Will 100x probe with isolation transformer work ?

 

[jiripolivka]

thanks , jitipolivka for your suggestion. The manufacturer will be looking in the problem directly so we are loose now.
But I am curious, how this voltage(1ph or 3ph) can be data logged or seen directly with noises ?
Will 100x probe with isolation transformer work ?

An isolation transformer is OK but a 100 x probe must be preceded by a high-pass filter, otherwise 50/60 Hz and harmonics will overload the probe.
Such device can indicate high-frequency noise but not the slow "thump" caused possibly by an overload.
Commercial instruments allow for all details, this is why I recommend to rent one for a limited time, to find the problem.

 

[rudr_p]

Actually, the OEM has taken over the problem(finding solutin) so we are playing no role in finding out problem......
I am just curious, how it is done.

Why would the probe overload ?
Aren't they designed for any frequency (upto the limit given)