3.2 Instrument overview
Narda NBM-550 17
1 Probe connector socket
2 Microphone
3Display
4 Operating panel
Function keys
Used to select the menu functions shown on the display
ESC key
Used to exit from a menu / reset functions and measured values
OK key
Used to open a menu or function / confirm a setting
UP/DOWN arrow keys
Used to select menus and functions / change values / lock the keypad / change the
contrast
ON/OFF key
Used to switch the instrument on or off
Charge Charge state
Indicates the charge state (red = rapid charging, green = trickle charging)
Status Operating status
Indicates the instrument operating status: Green = normal operation, red = remote
operation, flashing red = firmware update or exceeded alarm threshold
5 Tripod bush
6 Electrical and optical connectors
6a Multi-function socket for USB / GPS (optional) / external trigger
6b Earphone
6c Optical connector
6d AC Adapter / Charger
7 Tripod bush (on back of instrument)
8 Battery compartment (on back of instrument)
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