HP 8712ES User Manual page 448

Specifications
Table 9-8 Test Port Input (continued)
HP 8712ET/ES and HP 8714ET/ES Test Port Input
a
Group Delay Accuracy (Characteristic)
HP 8712ET/ES and HP8714ET/ES
a. Valid for HP 85032B/E (type-N 50 Ω) and HP 85036B/E (type-N 75 Ω) cal kits using either a two-port or enhanced
response calibration.
9-38 ES User's Guide