3 Preparing the NBM-520 for use
16 NBM-520 Narda
1 Probe connector socket
2Display
3 Operating panel
Hold or Start / Stop button
Freezes the display value, or start / stop measurement for spatial measurements
Mode button
Selects the display mode for the measured values
Units button
Selects the display units
ON / OFF or Clear button
Switches 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
– Alarm limit exceeded
4 Rubber cover
5 Tripod bush
6 Electrical and optical connectors
6a AC Adapter / Charger
6b Optical connector
7 Battery compartment (on back of instrument)
8Stand
Probe (various models available)
9Probe head
10 Probe plug
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