Atec Agilent-E5071B - Manual (Page 13)

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Table 1-14 Test port input (group delay 1 )
Description Specification Supplemental information
Aperture (selectable) (frequency span)/(number of points -1)
Maximum aperture 25% of frequency span
Maximum delay Limited to measuring no more than
180° of phase change within the minimum aperture.
Accuracy See graph below, typical
The following graph shows group delay accuracy with type-N full 2-port calibration and a 10 Hz IF bandwidth. Insertion loss is assumed to be < 2 dB.
Group delay (typical)
In general, the following formula can be used to determine the accuracy, in seconds, of specific group delay measurement:
± phase accuracy (deg)/[360 x aperture (Hz)]
1 Group delay is computed by measuring the phase change within a specified step (determined by the frequency span and the number of points per sweep).