HP manual ‘Ihble 7-12. EIP 8753E Instrument Specifications 6

‘Ihble 7-12. EIP 8753E Instrument Specifications (6 of 6)

INPUT GENERAL (cont.)

Description SpecWcation code

GBOUP DELM CHABACTEBISTICS

Soup delay is computed by measurhig the phase change within B speciiied frequency step (determined by the frequency span and the number of points per sweep).

Aperture (selectable)	(frequency span)/(number of points -1)
Maximum Aperture	20% of frequency span
	l/2 x (lAuinimum aperture)
me maxhuum delay is limited to measuring no more than 180 o
>f phase change within the minimum aperture.)
	6-e awl4

l’he following graph shows group delay accuracy with 7-mm full Z-port calibration and a 10 Hz IF bandwidth. Insertion loss is rssumed to be <2 dB and electrical length to be ten meters.

HP8753E Typical Group Delay Accuracy

100

g-3 S-3 S-3

S-3

Group Delay Accuracy vs. Aperture

n general, the following formula can be used to determine the accuracy, in seconds, of speciilc group delay neasurement:

*Phase Accuracy (deg)/360 x Aperture (Hz)

depending on the aperture and device length, the phase acanacy used is either incremental phase accmncy or vorst case phase accmacy.

Specifications and Measurement Uncertainties 7-16