Narda 32 Nardalert S3
6 Instrument maintenance
Theory of operation
The NS3’s patented design can be supplied with RF/microwave sensors
(2271/XX) that detect the electric eld over an extremely broad frequency
range regardless of signal type or polarization.
• The low frequency detector is a low-impedance, surface-area type
designed to detect the radial elds that are characteristic of low-fre-
quency communications systems. The diode based detection operates
in its “square-law” region to yield accurate results even in complex,
multi-signal environments.
• A diode-dipole antenna is added to complement the low frequency
sensor in the UHF region and to optimize detection of any and all
polarizations.
6.2 Verication overview
Simplied block diagram
Push
Button
Controls
Fiber Optic
Connection
USB
Connection
Batteries
B1
and B2
Removable
Field Sensor
with EEPROM
Audio and
Vibrate Alarms
LCD and LED Displays for
Notication and Alarms
Micro-controller with RAM, EEPROM MUX, A/D CONVERTOR,
PWM, RTC and RESET
To PC
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