Atec Agilent-E5063A - Manual (Page 15)

15
Group delay 1
Description Speciication Typical
Aperture (selectable) (frequency span)/(number of points - 1)
Maximum aperture 25% of frequency span
Minimum delay Limited to measuring no more than 180° of
phase change within the minimum aperture.
Accuracy See graph below (typical)
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).
The following graph shows group delay accuracy with 3.5 mm connectors, full 2-port calibration and a 10 Hz IF bandwidth.
• Calibration kit (85052D).
• Insertion loss is assumed to be < 2 dB.
In general, the following formula can be used to determine the accuracy, in seconds, of a specific group delay measurement:
± phase accuracy (degrees) / [360 x aperture (Hz)]