NARDA nardalert S3, Руководство по эксплуатации, Страница: 26 / 40

5 Operation overview
26 Nardalert S3
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
alternately. 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 Nardalert S3 default alarm levels
The NS3 is supplied from the factory with Alarm 1 set at 50% and Alarm
2 set at 200% of RF/microwave Exposure limits for Occupational or
Controlled limits. Standards and guidance’s normally recommend
conservative exposure limits that are both time and spatially averaged
and relate to a 100% reading on the NS3. However, the NS3 cannot
typically perform time and spatial averaging when being used as a
wearable monitor. Therefore, Narda has historically recommended that a
50% alarm be used to warn the wearer of the presence of strong fields
and a 200% reading to warn the wearer to leave the area. While it might
be possible that a 200% reading is still compliant with standards once
readings are time and spatially averaged, it is beyond the capability of
the NS3 to determine that in normal use.
5.3 Special environmental operations
Heavy rain or snow
The NS3 was designed to be water resistant. It is recommended to
employ the optional Weatherproof Pouch, P/N 2270/92.01 as a minimum
measure to keep water from accumulating within the unit. It is NOT
recommended to wear the monitor inside of clothing as wet garments
can seriously attenuate microwave field 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.