09 | Keysight | M9485A PXIe Multiport Vector Network Analyzer 1 MHz/50 MHz to 9 GHz - Data Sheet
Test port input
Test port noise floor
Test port damage level
(frequency span)/(number of points - 1)
25% of frequency span
Limited to measuring no more than 180°
of phase change within the minimum
See graph below (typical)
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).
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
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)]