Initial current

Try this, I found it here at Globalspec.com http://test-equipment.globalspec.com/SpecSearch/PartSpecs?PartId={AA8FAAE0-53EB-4540-A1E1-C4E970543FEB}&VID=2525&Comp=156&QID=9015353

Enjoy

I do not know of a specific instrument which undertakes this dedicated reading.

But in the UK we have instruments which are known as Portable Appliance Testers which carry out a range of tests on household and portable equipment which are connected by a plug top.

Some of these PAT testers undertake this test as part of the overall range of tests.

Two of these are the Edgecumbe Instruments Ltd range of MPAT testers, and the AVO/MEGGER DVR series.

On these instruments there is an inrush current test which is undertaken to prevent excess current damage to the testers - for instance a computer CRT monitor might be rated at 1.5A but during this test these instruments would record an inrush surge current in excess of th 14A due to the coil inductance.

Is this the sort of test you require. The disadvantage of this approach is the tester cost £900 - £1000

Claire Industries UK, make type and compliance testing equipment por portable and household goods they may have something in their range

Please give the web site address for this company the Edgecumbe Instruments Ltd range of MPAT testers, and the AVO/MEGGER DVR series.

To enquire further Details about the initial Current testing equipment.

Inform by Email Address pvnreddie@hotmail.com or Pnarasimha@wes.com.kw

Your cooperation anticipated.

Best reagrds,

P.V.N.Reddy

Some digital multimeters and clampmeters have a Max function that can capture the maximum voltage or current in a circuit. Just check out their websites.

ASSUMPTIONS:

Questionner is Electrical Engineer and analytical

He want to find out-seriously.

He cannot get a Peak Reading Multimeter/Clamp-on AMMETER

He can buy a 5:1 Amp output Current Transformer

He hooks up the Inrush Current through Primary.

Before that he loads Allowed resistor across secondary.

And to Peak-Read the Inrush Current he Connects a Peak Charging Elcap say 50 microfarad through a diode ---PIV say 200+ across the load resistor. And a DVM in DCVolt range across the Capacitor

He switches on appliance-keeping hawk's eye on to the peak voltage to which the ELCAP charged through diode.

{ Peak voltage + say0.5V forward diode drop} divided by 5 is what the Inrush was .

Nice idea. But what about the charging rate of the capacitor? A capacitor cannot instantly charge up to the input voltage (due to internal resistance plus the diode forward resistance).

You'll get a close figure but how close will it be? If the inrush current lasts for several seconds, this idea will work. If it's only for an instant, the error will be larger.

In majority of cases INRUSH TO STEADY EVELOPE is exponential over about 5 seconds=250cycles @ 50Hz.

Cap. will need 2-3 periods to peak up

Should read fast!

Regards

MM

Yes, if there is equipment available in the specialized houses, these can be of low cost as well as of precision that is expensive, you can use a amperimetrica clamp, oscilloscope, among others.

Tomas

http://www.martindale-electric.co.uk/pats.htm#mm42

Open the MPAT + Instruction to see details of "Fuse test"

http://www.megger.com/uk/products/ProductDetails.php?ID=270&Description=PAT#View%20PAT4_DVF3_DS_en_V13.pdf

You will need to register in order to download the instructions for the "Operation test" - this preceded by the Inrush test.