Svantek SV 973, Руководство пользователя

Страница: 40 / 212

SVAN 973 User Manual 40
Note: The Wave Recording function is optional and should be unlocked by entering the
activation code in the text editor screen, opened by the ► key. Once unlocked this option will
be available permanently.
Slope trigger
The Slope+ trigger starts a signal recording under the condition: rising value of
the Leq result ( Source ) integrated by 0.5 ms passes above the threshold level
( Level ).
After pressing the <Start> key the instrument checks the trigger condition with steps, defined by the
Tr. Period parameter, and if condition is met starts the signal recording. Recording lasts minimum
Rec. Time , and during this time the instrument continues to check the trigger condition with the
Tr. Period step. Provided that Tr. Period is shorter than Rec. Time , if next trigger condition is met during
Rec. Time the instrument triggers recording again, so it will continue from this moment by additional
Rec. Time and so on. If during next recording time there are no triggers, recording will be stopped after
the last trigger plus Rec. Time . Assuming, that after first recording trigger conditions continue to be
checked, new wave recording may start during the same measurement time.
The attached example shows that between
measurement start and stop two records
were created. The first record is equal to the
Rec. Time , because during this period no
second trigger condition has been met.
During
the second recording the
measurement was stopped, and the record
is shorter than
Rec. Time .
The Slope - trigger starts a signal recording under the condition: falling value of
the Leq result ( Source ) integrated by 0.5 ms passes below the threshold level
( Level ).
This is a mirrored trigger to the Slope + trigger.
Note: When a signal recording is waiting for the slope
trigger the “slope”
icon superimposes on the grey „signal” icon.
/
Level trigger
The Level + / Level - trigger starts a signal recording which will last the Rec. Time
under the condition: value of the Leq result ( Source ) integrated by 0.5 ms is
greater/lower than the threshold value ( Level
). In other cases, recording doesn’t
start, but if it has been already started it can be continued until the Rec. Time has
elapsed.
If during Rec. Time a trigger condition
appears, recording will be prolonged for
another
Rec. Time from the moment of that
trigger condition and so on.