Svantek SVAN 971, Руководство пользователя

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SVAN 971 User Manual
32
Level type trigger
The Level + trigger starts the 1-second measurement/integration under the
condition: value of the RMS result ( Source ) integrated by 0,5 ms is greater than
the threshold value ( Level ). In other cases, the instrument continues checking the
trigger condition every 0,5 mc.
When the new measurement cycle begins (after pressing the <Start/Stop> key or automatically after
stop of the previous measurement cycle) the instrument checks the trigger condition every 0,5 ms and
starts 1-second integration if condition is met.
After 1-second integration, the instrument
repeats the trigger condition checking
every 0,5 ms and starts next 1-second
integration if condition is met. The
instrument does it as many times as many
seconds are within the Integration Period
and stops the measurement cycle.
Therefore,
the series of 1-second
measurements may not be continuous,
and the duration of the measurement
cycle
may be longer than the
Integration Period.
The measurement can be stopped manually at any moment with the <Start/Stop> key. Summary Results
are calculated on the base of series of 1-second results measured during each measurement cycle and
saved in the results file.
The Level - type trigger starts the 1-second measurement/integration under the
condition: value of the RMS result ( Source ) integrated during 0,5 ms is lower than
the threshold value ( Level ). In other cases, the instrument continues checking the
trigger condition every 0,5 mc.
This is a mirrored trigger to the Level + trigger.
Note: When a measurement is waiting for the level trigger, the flashing
“Level trigger” icon superimposes on the „waiting” icon. /
Gradient type trigger
The Grad + trigger starts the 1-second measurement/integration under the
condition: value of the RMS result ( Source ) integrated during 0,5 ms is greater
than the threshold level ( Level ) and the gradient of the Source value is greater
than the gradient threshold level ( Gradient ). In other cases, the instrument
continues checking the trigger condition every 0,5 mc.
This type of trigger has the same logic as the Level + trigger, but the trigger condition requires also
gradient level to be exceeded.
Note: When a measurement is waiting for the gradient trigger, the
flashing “trigger” icon superimposes on the „waiting” icon.
Source result
Only one measured result can be used as a source ( Source ) for checking of
trigger conditions in the Level Meter mode, namely the output signal from the
LEQ detector coming from the first profile, which is denoted here as Leq(1) . This
position does not become active (it is not displayed inversely) and the text stated
here remains unchanged.