Electronic Loads

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I purchased a TEKPOWER 3710A electronic load to test the switcher power supplies. What I found it that it does not work, it appears the internal electronics of the 3710A does not "like" the large current ripple or noise of the supply. (Notes it is for LEDs so the ripple is high then normal) Can you suggest a source such as the one you use in the APPTV shows.
The low cost loads are the Kikusui PLZ-72W or PLZ-152W e-loads. More fancy ones are the Chroma 6330 series High Speed DC Electronic Loads. The chroma load offers a CV (constant voltage) load as well which is not available in the Kikusui models...