Recommended Calibration Interval; Figure 1-5 8487A Power Sensor With Adapter - Keysight Technologies 8481A Operating And Service Manual

Introduction 1
50 GHz Frequency operation (8487A and 8487D)
8480 series sensors that operate up to 50 GHz are fitted with 2.4mm (m)
connectors as standard. To convert the 2.4mm (m) connector for calibration,
adapter (2.4mm (f) to Type-N (m)) is included with the power sensors (shown in
Figure 1-5).
The 2.4mm to Type-N adapter is intended for use only at the 1 mW, 50 MHz
NOTE
power reference of the power meter. Its function as a calibration reference may
be compromised if used for other purposes.
Figure 1-5 8487A power sensor with adapter

Recommended Calibration Interval

Keysight Technologies recommends a one-year calibration cycle for the 8480
series power sensors.
Keysight 8480 Series Operating and Service Manual 21