Agilent Technologies N5230C Uživatelský manuál stáhnout pdf (Strana 28)

Table 9. Test Port Input (Group Delay)

Description Supplemental Information (typ.)

Aperture (selectable) (frequency span)/(number of points -1)

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.

For any S

Group Delay measurement, S

= 0, S

= 1, S

= 0, S

= 0 for all kl ≠ ij

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

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)]

Depending on the aperture and device length, 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 N5230C Uživatelský manuál Strana 28