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Fieldfox N9923 vector voltmeter B/A result not stable

Question asked by edmw on Jul 2, 2013
Latest reply on Jul 17, 2013 by am95405

when using  HP8508a, the result for B/A is very stable,as in it does not fluctuate alot. but when i use fieldfox N9923, the values keep jumping. is it because i do not have the option 122 T calibration kit that's why it is unstable?