Anritsu 681XXC - Manual (Page 223)

Initiating
HP8757D
SNA
Operation Turn ON the HP8757D to initiate scalar network
analyzer operation. (Refer to the Hewlett Packard
Model 8757D Scalar Network Analyzer Operation
Manual for operating instructions.
681XXC OM 7-19/7-20
USE WITH USE WITH A HP8757D
OTHER INSTRUMENTS SCALAR NETWORK ANALYZER