Svantek SVAN 979 - Page 52

52
SVAN 979 User Manual
Level trigger
The Level + / Level - trigger enables logging of the Logger results with the
Logger Step on condition: value of the measured result (Source) averaged over
the Logger Step period is greater/lower than the threshold value (Level). In
other cases, the logging is skipped.
Due to this type of trigger it is possible to separate results related to the low/high
noise level.
The logging is active only when the
summary results are measured, i.e. from the
measurement start till the measurement
stop.
This means, for example, that when the
measurement is waiting for a trigger
condition, logging is skipped, even if the
logger trigger condition is met.
Note: When logging is waiting for the level trigger the “level” icon
appears alternatively with the „curve” icon.
or
Source result
Only one measured result (Source) can be used for checking trigger condition in the Level Meter mode, namely
the instantaneous RMS from the first profile (with appropriate filter and detector), which is denoted here as
Leq(1) in the sound mode and RMS(1) in the vibration mode. This position cannot be changed.
When the 1/1 Octave or 1/3 Octave mode is chosen it is possible to use the
RMS band-pass value of one of the 1/1 octave or 1/3 octave spectrum filters with
the appropriate central frequency as the source of the triggering signal for the
logger.
Available values of the Source parameter for the 1/1 Octave mode:
Leq(1)/RMS(1), 125Hz, 250Hz, 500Hz, 1.00kHz, 2.00kHz, 4.00kHz, 8.00kHz,
16.0kHz.
Available values of the Source parameter for the 1/3 Octave mode: Leq(1) /RMS(1), 125Hz, 160Hz, 200Hz,
250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1.00kHz, 1.25kHz, 1.60kHz, 2.00kHz, 2.50kHz, 3.15kHz,
4.00kHz, 5.00kHz, 6.30kHz, 8.00kHz, 10.0kHz, 12.5kHz, 16.0kHz, 20.0kHz.
Threshold level
The threshold level for the logger trigger
(Level) can be set with 1 dB steps in the
range from 24 dB to 136 dB in sound mode
and from 1 mm/s
2
(60 dB) to 10 km/s
2
(200 dB) in vibration mode.
Pre and post trigger logging
In the Pre Trigger position, you can define the number of results which will be registered in the logger file before
the fulfilment of the first trigger condition. This number can be set in the range 0..50.
In the Post Trigger position, you can define the number of results which will be registered in the logger file
after the fulfilment of the last trigger condition. This number can be set in the range 0..200.