Keysight EPM Series Installation Manual page 33

Getting Started 1
Connector Function
The power reference is a 1 mW (0 dBm) 50 MHz signal available
from a 50 Ω type-N connector. It is used for calibrating an 8480 or
E-Series Power Sensor and Meter system. If the meter is configured
with Option 003, the connector is fitted to the rear panel. The green
LED beside the connector is lit when the calibrator is turned on.
The sensor input connectors (N1914A shown, the N1913A has one
input). If the meter is configured with Option 003, the connectors
are fitted to the rear panel and the front panel connectors are
retained.
The USB Type A port is solely for U2000 Series power sensors usage
only. If the meter is configured with Option 008, one USB Type A
port is fitted to the front panel and another Type A port to the rear
panel. If the meter is configured with Option 009, two USB Type A
ports are fitted to the rear panel.
Keysight N1913/1914A Installation Guide 33