The
SMP
samples the field twice per second and so for an average interval of 10s,
for example, the
SMP
will calculate the average each 10s of the 20 samples taken
twice per second.
2.
Sliding average
: The arithmetic average of a window of ‘average_interval x 2’
samples that is moved twice each second. In other words, twice each second a new
sample enters the window and the oldest sample leaves the window. The main
difference between this average and the arithmetic average is that the sliding
average is updated twice per second (although it is shown on the screen once per
second) rather than every ‘average_interval’ seconds.
In both cases, the average is only calculated when a memorisation is started. When the
memorisation is started, the value of the average will not be valid (it will be displayed as 0)
until the first ‘average_interval’ seconds have passed.
The value of the average can be reset using the
Reset/max/min/avg.
option on the
configuration screen.
5.6.3
IS measurement
The IS measurement corresponds to the most common setup as specified in International
Standards.
That measurement allows an average to be taken of the field values measured every second
over 6 minutes at a given place without the presence of the technician affecting the result.
To make this type of measurement, select
Average type = IS
on the configuration screen.
Average interval = 6m
and
Log interval = 1s
will be selected automatically. Under those
conditions, when the
Log/RD
is pressed:
1.
The apparatus will wait 10s before starting the measurement to allow the technician
to move away. After the 10s, a beep will indicate the start of the measurement.
2. It will take a measurement once per second for six minutes, storing the values in the
selected register.
3. At the end of the 6 minutes, the measurement will be stopped automatically and the
alarm will sound. The apparatus will calculate the average, display it on the screen
and store it in memory.
An IS measurement can be cancelled at any time by pressing the
Log/RD
key.
5.6.4
Maximum and minimum field
The
SMP
can show the maximum and minimum field obtained in a measurement on the
screen. Those values are only updated when a memorisation is made and they are reset by
keeping the
Back
key pressed for 2 seconds.
5.6.5
Alarm
The alarm function is very useful for the technician who makes the measurements because
it allows the apparatus to give an audible warning when the field exceeds a threshold value
defined on the configuration screen. The alarm will only sound if the alarm function has
been activated using the
Alarm
key.
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