18 Annex A
208 SRM-3006 Narda
18.1 Pendulum method
Measurement setup
The antenna is mounted directly on the instrument or the antenna is
connected to the Basic Unit via a short cable.
Information about connecting an antenna is found under Fitting a Narda
antenna directly on the Basic Unit on page 30 and Connecting a Narda
antenna to the Basic Unit using a Narda cable on page 31.
Procedure
During the measurement, the user traverses the space being measured.
The entire volume of space to be measured is sampled slowly by means of
the hand-held antenna, which is moved up and down on a wave-shaped
path (i.e. swung, like a pendulum) through the room, changing the direction
of the main lobe and the direction of polarization at the same time.
During this process, regardless of the selected operating mode, the SRM
should be set to result type MAX (Maximum hold).
Experience has shown that a few minutes are usually sufficient time for
determining the maximum field strength occurring within a specific
measurement volume such as a room in a house or an office.
Advantages of this method
• Immediate determination of the maximum emission value for the room
being measured
• Takes only a short time
• Minimal disturbance to the use of the rooms affected
• No special preparation for the measurement needed (e.g. moving
furniture, etc.)
Useful application
• Rapid determination of the maximum field strength in a room
• Searching for maximum values in areas where tolerance to disruption is
low (e.g. offices)
• Searching for maximum values at locations where a high degree of
mobility is needed (e.g. on platforms, roofs)
• Sufficient experience is necessary
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