Agilent Technologies ENA Series Betriebsanweisung Seite 556

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550 Chapter 16
Specifications and Supplemental Information
Test Port Input
Table 16-14 Test Port Input (Group Delay)
*1
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, typical
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 × 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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