[volt-nuts] Checking an LCR meter

2015-02-06 Thread Dr. David Kirkby (Kirkby Microwave Ltd)
I have bought an HP 4284A precision LCR meter. This is an old model with a basic accuracy of 0.05% and covers 20 Hz to 1 MHz. Converting the specifications into determining the uncertainty of a measurement is nontrivial, but I think it reasonable to assume the uncertainty will always be >0.05%. S

[volt-nuts] Reference in Signametrics 7.5 digit DMM?

2015-02-06 Thread Jan Fredriksson
Hi, Does someone know what reference is used in the Signametrics/Agilent 2060x? I have had an unused SMU2064 on the shelf for some time. Recently I powered it up and found it very noisy compared to my LTZ1000 based DMMs. It seems I can get around 6.5 digit resolution from this DMM, noise is in th