Narda 28 Nardalert S3
5 Operation overview
Alarms are indicated by the screen, LEDs, audible and vibrate alarms. In
an Alarm 1 situation the tone and vibrator alternate at an approximate 1
second rate. Red and Amber LEDs will also illuminate on one side of the
display. Exceeding the Alarm 2 threshold will cause the audible alarm to
step through 5 tones while the vibrate rate is doubled from the Alarm 1
rate. Red and Amber LEDs on both sides of the display will illuminate alter-
nately. If customers choose to employ only one alarm, it will indicate Alarm
2 characteristics.
The battery icon is always displayed on the unit. When the battery displays
a “Red” background there is less than 20% life left and the unit should be
charged immediately. If the battery level falls below 10%, audible and LED
alarms will be generated without vibration or LCD backlight.
5.2 Special environmental operations
Heavy rain or snow
The NS3 was designed to be water resistant. It is recommended that the
silicon skin be employed as the minimum measure to keep water from
pooling within the unit. It is NOT recommended to wear the monitor inside
of clothing as wet garments can seriously attenuate microwave eld levels
the unit may need to detect.
Extreme low temperatures will cause the LCD to respond slowly and for
the battery life to be degraded, however the unit will continue to function
to -20° C.
High ELF environments
The normal NS3 (with RF/microwave sensor) was not designed to func-
tion in areas where the ELF eld strength is greater than 6 kV/m. Higher
ELF eld levels can cause the NS3 to false alarm. If operation is needed in
higher eld levels, special sensors can be supplied. Contact the factory
(NardaSTS@L-3COM.com) for further information.
High RF/microwave environments
The NS3 has not, at the time of this writing, developed a high power sensor
for use with RF clothing. Persons wearing RF clothing should not use this
monitor under the clothing. Currents owing through the clothing could
cause the monitor to false alarm.
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