When verifying source-measure units, is it acceptable to use the UUT source function as the source for the measure verification via comparison with a Ref. DMM (8508)? My concern is possible loading effects since there are effectively two meters in parallel when the SMU is set to both measure (meter 1) & source simultaneously, while monitored by the 8508 (meter 2). I have always used an independent source, typically a 5720, to verify the UUT measure function. Has anyone considered this scenario?
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