Svantek Shawcity SVAN 977C, User Manual

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55 SVAN 977C User Manual
Int. Period Split trigger
When the Int. Period Split trigger is selected, recording is triggering every time
the measurement starts and ending after the Integration Period time, e.g. the
recording time is equal to the Integration Period time. In this case the
instrument creates a WAV file for every measurement cycle.
Note: When a signal recording is waiting for the External,
Integration Period or Integration Period Split
trigger the “trigger”
icon appears alternatively with the „wave” icon.
Source result
Only one measured result can be used as a trigger source ( Source ) for checking the 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.
This result averaged for the Trigger Period is compared with the Level value with the step defined by the
Trigger Period .
Threshold level
The threshold ( Level ) can be set with 1 dB
steps in the range from 24 dB to 136 dB in
the sound mode and from 1 mm/s
2
(60 dB)
to 10 km/s
2
(200 dB) in the vibration mode.
Checking the trigger condition
The Trigger Period parameter defines the time interval of checking the trigger
conditions. This parameter can be set as: Log. Step (same as Logger Step
value), 0.5ms , 100.0ms and 1s .
The Recording Time parameter defines the time of signal recording after every
trigger. The available values can be selected from 1s to 8h or Inf (recording will
last until measurement stop).
Recording before trigger
When Pre Trigger is higher than 0 then the wave signal starts to be recorded
before the first trigger. The period of such recording depends on the sample
frequency and bits per sample. The pre-trigger periods are:
•
for 24 bits per sample: 2s for 48 kHz, 4s for 24 kHz and 8s for 12 kHz.
•
for 16 bits per sample: 4s for 48 kHz, 8s for 24 kHz and 16s for 12 kHz.
4.5 S
ELECTING MICROPHONE COMPENSATION
–
C
OMPENSATION
The Compensation position is available
only in the Sound meter modes. It allows
you to select the appropriate compensation
for different measurement situations. Default
settings
– see Chapter
2.7 .
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