HP 8753E manual Applicationmd OperationConcepts

In standard vector error-correction, a thru (delay = 0) is used as a calibration standard. The solution to this problem is to use a calibration mixer with very small group delay as the calibration standard.

An important characteristic to remember when selecting a calibration mixer is that the delay of the device should be kept as low as possible. ‘Ib do this, select a mixer with very wide bandwidth (wider bandwidth results in smaller delay).

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