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117

Table 37. Test Port Input (Group Delay)

Description Specification Supplemental Information (typ.)

Aperture (selectable)

(frequency span)/(number of points -

Maximum Aperture

20% of frequency span

Range

0.5 x (1/minimum aperture)

Maximum Delay

Limited to measuring no more than

180° of phase change within the

minimum aperture.)

Accuracy

See graph below. Char.

The following graph shows characteristic group delay accuracy with full 2-port calibration and a 10 Hz IF

bandwidth. Insertion loss is assumed to be < 2 dB and electrical length to be ten meters.

NOTE: The following graph also applies to the “C” model of the analyzers.

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)]

Dependin

on the aperture and device len

th, the phase accuracy used is either incremental phase accuracy or

worst case phase accuracy.

Group delay is computed by measuring the phase change within a specified frequency step (determined by the frequency span and the

number of points per sweep).

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Agilent Technologies E8364C Manuale Utente Pagina 121