Atec Agilent-E5061B - Manual (Page 18)

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Table 19. Test port input (group delay)
Description Specification 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
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: ±phase accuracy (deg)/[360 x
aperture (Hz)]
Figure 19. Group delay (typical)
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).
Group Delay (Typical)
0.001
0.01
0.1
1
10
100
0.01 0.1 1 10 100
Aperture (MHz)
Accuracy (nsec)
E5061B 3L5 Full Two Port Cal Using 85032F
Frequency = 1 GHz
S11 = 0; S21 = 1; S12 = 0; S22 = 0
IF Bandwidth = 10 Hz; Average Factor = 1
Cal power = -10 dBm; Meas power = -10 dBm; Electrical Length = 10 m
Group Delay (Typical)
0.001
0.01
0.1
1
10
100
0.01 0.1 1 10 100
Aperture (MHz)
Accuracy (nsec)
E5061B 237 Enhanced Transmission Response Cal Using 85036B
Frequency = 1 GHz
S11 = 0; S21 = 1; S12 = 0; S22 = 0
IF Bandwidth = 1 Hz; Average Factor = 1
Cal power = -10 dBm; Meas power = -10 dBm; Electrical Length = 10 m