Agilent Technologies N4413A User Manual page 205

ID Rear Panel
Number Feature
10 PORT 4
FUSE
11 PORT 4 BIAS
Chapter 7
Feature Description
Bias Fuse, 0.5 A, 250 V (Agilent part number 2110-0012)
BNC (f) connector. The bias port is used to supply a dc voltage
to an active DUT, such as an amplifier or a transistor.
Instrument Information
Front and Rear Panels
195