Equipment/Prodigit 4010 Digitizing Power Meter GPIB
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See http://www.prodigitusa.com/prodigit/4011a/4011aSpecifications.htm for full specification
If you are dealing with non ohmic loads (like computers, switches power supplies TL Tubes, etc) - consult http://www.prodigitusa.com/prodigit/4010a/4010aApplicationNotes.htm for a lot of good advice.