4.1 Switching on
Narda NBM-550 31
EHP-50
If the EHP-50 is already switched on and connected to the
NBM-550, the NBM-550 will detect it automatically and will
switch to EHP-50 measurement mode when the switch on
routine has completed.
If you connect or switch on the EHP-50 after you have
started the NBM-550, you will have to select EHP-50 mode
manually (see “Selecting EHP-50 mode manually” on
page 64).
GPS reception
The GPS receiver module is included as an accessory in
the option set (see “Ordering information” on page 133)
and allows you to determine the exact position of the
instrument using GPS (Global Positioning System).
When the GPS module is connected, the coordinates along
with other information are shown in the upper section of the
display.
If GPS cannot be received despite a GPS module
connection (e.g. in closed rooms), Lat: and Lon: are
displayed without appropriate values.
If GPS was received but suddenly interrupted (e.g. due to
poor signal quality or an unplugged GPS plug), the most
recent available coordinations remain displayed and are
marked with an exclamation point.
The information is explained in the table below.
Table 2 GPS symbols in the display
Symbol Meaning
Lat Latitude
Lon Longitude
Warning that the displayed GPS data is not up to date.
GPS data is being received with enhanced accuracy
(deviation < 3 m).
This type of reception is only possible in regions
where the corresponding satellite service is available.
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