Agilent Technologies ENA Series User Manual page 552

Specifications and Supplemental Information
Test Port Input
Table 16-14 Test Port Input (Group Delay)
Description
Aperture (selectable)
Maximum Aperture
Minimum Delay
Accuracy
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.
In general, the following formula can be used to determine the accuracy, in seconds, of specific group delay measurement:
*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).
546
*1
Specification
(frequency span)/(number of points − 1)
25% of frequency span
± Phase Accuracy (deg) / [360 × Aperture (Hz)]
Supplemental Information
Limited to measuring no more
than 180° of phase change within
the minimum aperture.
See graph below, typical
Chapter 16