18 | Keysight | E5061B Network Analyzer, 100 kHz to 1.5/3 GHz, 5 Hz to 500 M/1.5 G/3 GHz - Data Sheet
Table 19. Test port input (group delay) 1
Description
Specification
Supplemental information
Aperture
(frequency span)/
(selectable)
(number of points –1)
Maximum aperture
Minimum delay
25% of frequency span
Limited to measuring no more than 180 ° of
phase change within the minimum aperture.
Accuracy
See graph below
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.
Figure 19. Group delay (typical)
Group Delay (Typical)
E5061B 237 Enhanced Transmission Response Cal Using 85036B
100
10
1
0.1
Frequency = 1 GHz
S11 = 0; S21 = 1; S12 = 0; S22 = 0
0.01
IF Bandwidth = 1 Hz; Average Factor = 1
Cal power = -10 dBm; Meas power = -10 dBm; Electrical Length = 10 m
0.001
0.01
0.1
1
10
100
Aperture (MHz)
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).
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