6 cal/zero key menu, 6 cal/zero key menu -86, Boonton 4540 series rf power meter – Boonton 4540 Peak Power Meter User Manual User Manual
Page 134: Operation

Boonton 4540 Series RF Power Meter
Operation
4-86
4.6 Cal/Zero Key Menu
Pressing thefront panel Cal/Zero key will alternately select the color coded Channel 1 and Channel 2 (if present) Calibration
menus. For a complete description refer to Section 4.5.8 Channel > Calibration Menu.
Fig. 4-75 User Preset Names Popup Menu