The Narda RadMan 2XT Radiation Monitor is a warning device for the protection of people who work in areas where increased levels of electromagnetic radiation are present. Broadcasting, telecommunications, and radar antennas are sources of strong electromagnetic fields, for example. It is often not possible to completely disable the transmitting equipment, and even if it is possible a check must be made to ensure that the switch-off has indeed occurred. A personal monitor provides safety in such situations. The device is worn on the body and warns its user in good time before the permitted limit values are exceeded.
Display and warning signals:
The actual field exposure level is indicated in six steps from 5% to 200% by LEDs. The percentages refer to the proportion of the power density limit value specified in a safety standard. If the field exposure level exceeds 50% of the limit value, the device vibrates and emits a loud alarm tone. There is also a bright light in the top part of the RadMan 2 that can be easily seen from various angles. The light flashes red in time with the alarm signal. A second, more persistent alarm sounds when the 100% threshold is exceeded, warning the user to leave the danger area.
The permitted limit values specified in the standards vary according to the frequency. Weighting filters in the sensors of the RadMan 2 simulate the frequency response to ensure that the alarm thresholds for all radio frequency signals are always set correctly.
Integrated sensor test:
The newly developed sensor test provides additional assurance. The correct function of each sensor is checked every time the RadMan 2 is switched on.
Usable in near field and far-field conditions:
The otherwise fixed relationship between the electric and magnetic fields does not apply in the near field region. Both types of field, therefore, need to be checked. RadMan 2 is equipped with both E field and H field sensors, so it provides reliable warning regardless of the distance from the radiation source. Minimal body effects Personal monitors are generally worn on the person. RadMan 2 is supplied fitted with a suitable attachment and RF absorber that allows it to be fixed easily to a harness or belt. The RF absorber reduces the signal reflections caused by the body which would otherwise affect the result displayed by the monitor. If needed, the RadMan 2 can be released from the attachment with one hand to determine the field exposure away from the body with an isotropic directional characteristic. An elastic security cord between the device and the attachment prevents the device from being dropped.
RadMan 2XT functions:
The E field sensors of the RadMan 2XT are suitable for a wider frequency range that extends from about 1 MHz up to 40 GHz. The device is, therefore, able to warn of excessive levels of directional radio, 5G cellular and radar signals in this frequency range. To ensure that pulsed radar signals are reliably detected, the integration time can be changed from 1 s (RMS Mode) to 30 ms (Peak Mode) on the device itself. The setting is displayed on the device. The data recorder of the RadMan 2XT is equipped with larger memory, and the save intervals can be user configured. The additional RF Detection Mode with its tone search function enables precise localization of leaks in waveguides and coaxial screw connectors. As the pitch of the tone changes when the field source is approached, this feature can also be used to quickly and simply check that an antenna has been switched off.
Recording results with the data recorder:
RadMan 2 saves the exposure values for the E field and H field continuously and adds a timestamp to each data set. The oldest data is replaced by the latest data when the ring memory is full. Up to 100,000 events can be detected and recorded.
The RadMan2-TS software allows the contents of the RadMan 2 data recorder to be transferred to a PC via the USB interface. The maximum exposure values that have occurred as well as the averaged values can be displayed as a table or as a graph versus time using this software. It can also display live exposure level values and it can be used to configure the RadMan 2XT. The latest version is available for free download.