Model 831 Manual Run Modes Without Measurement History 6-5
Timed Stop
The time at which the measurement is to stop is entered
manually into the Time data field.
In the Timed Stop mode, the minimum Time of one second
(00:00:01) will be saved if the time setting is left as
00:00:00 when closing or exiting the Control tab.
Stop When Stable
Suggestion: Press RUN after the
noise source is on and in the desired
condition. Starting a measurement
prior to activating the noise source
of interest may reduce the level
measured and take longer than
normal to stabilize.
The Stop When Stable feature is used to automatically end a
measurement when the time average level has stabilized. It
is often used in environments that have a rather continuous
or repetitive noise source such as machinery. The stable
condition is defined as when the Current measurement's
average level (i.e. LAeq) does not vary from maximum to
minimum by more than the entered Delta Level during the
entered Time interval. To be stable, the total of all variations
of the Current average level must also be less than two times
the entered Delta Level; this condition detects amplitude
modulation in the averaged level and prevents a premature
stop. Shorter measurement times, though with less accurate
results, are obtained by increasing the Delta Level or
shortening the Time. Longer measurements, that are more
representative of the true level, will be made with smaller
Delta Levels and a longer Time entries.
Entering Delta Level
The Delta level is the maximum allowed change in Current
average level (i.e. LAeq) permitted during the time interval
defined below. The minimum level that can be set is 0 and
the maximum is 5.0 dB. The default is 0.2 dB.
Entering Time
The Stable Time interval used for
determining the stable condition is
limited to 100s maximum. If
time>100s, it will run for the time set
and then stop when variations in the
Current average level over the last
100s are less than the Delta Level
The Time is the minimum interval that the measurement
must run. The measurement will run for the interval
specified and then continue until the stability condition was
met. The smallest value that can be entered is 20 seconds
and the largest is 99:59:59 (h:m:s). The default is 20
seconds.
For each, highlight the desired data field, enter the
appropriate values and press
5 (ENTER).
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