4 Measuring with the NBM-520
32 NBM-520 Narda
The period of time over which the average is taken can be
set using the PC software. The progress of forming the
average is shown by the remaining time display. The time
counts down to 0. When the averaging time has elapsed,
the remaining time display is no longer shown.
Press the Clear button to reset the average value and
restart the measurement.
SPATIAL (spatial average)
The spatial average function allows you to determine the
spatial average value of the field strength. This measure-
ment mode is used, for example, to determine the degree to
which the human body is exposed to electromagnetic radia-
tion.
Two measurement methods are provided:
• Discrete
Individual (discrete) measurement values are recorded
and averaged. This allows you to measure at specific
locations.
• Continuous
Measurement values are recorded and averaged
continuously while the probe is moved through the area of
interest. This allows you to measure the field strength
affecting an entire room.
You can set the measurement method using the PC soft-
ware.
To measure discrete values
✓ You have set the Measurement method to Discrete
using the PC software.
1. Press the Mode button repeatedly until the result type
SPATIAL is displayed.
2. Press the Hold button.
The first measurement value is displayed,
#1 indicates that one value has been measured so
far.
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