19 | Keysight | M9485A PXIe Multiport Vector Network Analyzer 1 MHz/50 MHz to 9 GHz - Data Sheet
Test port input
Group delay1
Description
Typical
Supplemental information
Aperture (selectable)
Maximum aperture
Minimum delay
(frequency span)/(number of points - 1)
25% of frequency span
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 3.5 mm connectors, full 2-port calibration and a 10 Hz IF bandwidth.
– Calibration kit (85033E).
– Insertion loss is assumed to be < 2 dB.
– Source/Receiver: Standard Configuration, Source/Receiver Reference/Test Attenuator: 0 dB
In general, the following formula can be used to determine the accuracy, in seconds, of a specific group delay measurement: ±phase
accuracy (degrees) / [360 x 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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