Atec Agilent-E5071C - Manual (Page 26)

26
Test port input (group delay) 1
Table 26. Option 230/235/240/245/260/265/280/285/430/435/440/
445/460/465/480/485
Description Specifi cation 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
specifi c 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).
Accuracy (nSec)
Aperture (MHz)
0.01 0.1 1 10 100
100
10
1
0.1
0.01
0.001