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Crest Factor = Peak Current / RMS Current. In a linear load, the Crest Factor is 1.414. However, in a general purpose SMPS, due to its non linear nature, this factor will be much higher - in the region of up to 4.
See if you can measure the current using a CRO/DSO by putting a small resistor but having higher wattage in line. Then measure voltage across it, adjust the scale of the CRO/DSO in such a way that V/R = I, you'll get the current in the CRO/DSO. Then get the peak value of it and knowing the rms, you can get the crest factor.
However, there are instruments which can measure CF.
Some loads like PC, IT equipments, switching equipments, servers etc have high crest factors. The crest factor requirement of a computer load does vary depending on the source which it is supplied from.
The fact that virtually all equipment installed in data centers today such as servers, routers, and storage devices are power factor corrected has virtually eliminated crest factor as a problem.
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