Atec Agilent-N5072A Series - Manual (Page 13)

13
Group Delay 1
Description Specification
(dB) Supplemental information
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)
The following graph shows group delay accuracy with type-N connectors, full 2-port calibration and a 10 Hz IF bandwidth.
• Calibration kit (85032F).
• 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)]
1. Group delay is computed by measuring the phase change within a specifi ed step
(determined by the frequency span and the number of points per sweep).
Figure 11. Group delay
0.001
0.01
0.1
1
10
100
0.01 0.1 1 10 100
Accuracy (nSec)
Aperture (MHz)
Group Delay