NARDA nbm-520 - Switching Off

4.7 Selecting the result type
Narda NBM-520 31
ACT (Actual)
The actual field strength value measured at the moment is
displayed.
If the measured value is outside the instrument’s measure-
ment range or if it cannot be shown correctly on the display,
appropriate symbols are displayed on the left to indicate
this.
Table 2 Symbols indicating value outside range limits.
MAX (Maximum)
The maximum value measured during the current measure-
ment is always displayed. Measurement of the maximum
value starts as soon as you switch on the instrument. The
measured value memory is cleared if you change the probe
or press the Clear button.
 Press the Clear button to reset the maximum value and
restart the measurement.
AVG (Average)
The following averages are determined:
• Linear average of power values (e.g. W/m
2
or mW/cm
2
)
• Root mean square (RMS) of field strength values
(e.g. V/m or A/m)
Both types of average give the same result. The averaging
process conforms to current safety standards for high fre-
quency fields and normally takes place over a period of
6 minutes. The units of the measured value can be switched
at any time without affecting the results already averaged.
The measured value is below the measurement
range of the probe.
The measured value is above the measurement
range of the probe.
The measured value is above the instrument dis-
play range.
Remaining time display
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