Svantek SV 971A, User Manual

Page: 37 / 305

SV 971A User Manual
37
Gradient trigger
The G 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 ) and the gradient of the Source value is greater than
the gradient threshold ( 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 „wait” icon.
Source result
Only one measured result ( Source ) can be used for checking trigger condition in
the Level Meter mode, namely the instantaneous LEQ from the first profile (with
appropriate filter and detector), which is denoted here as Leq(1) . This position
cannot be changed.
Threshold level
The threshold ( Level ) can be set in the range from 24 dB to 136 dB . The Source
value compares with the Level value every 0.5 milliseconds.
Speed of Source value changing
This position appears when the G trigger is chosen. The speed of the
Source value changing ( Gradient ) can be set in the range from 1 dB/ms to
100 dB/ms .
4.3 S
ETTING PARAMETERS FOR PROFILES
–
P
ROFILES
Parameters for three profiles can be set in the Profiles
screen (in case of Lev. Met. function) or in the Profile x
screens (in case of Dosimeter function).
Following parameters can be programmed
independently for each profile: weighting filters for other
than peak results ( Filter ), weighting filters for peak
results ( Filter Peak ) and LEQ detectors type ( Detector ).
<ENT>
Weighting filter
Next weighting filters for both Filter and Filter Peak positions can be selected:
Z according to IEC 61672-1:2013 for Class 1,
A according to IEC 651 and IEC 61672-1:2013 for Class 1,
C according to IEC 651 and IEC 61672-1:2013 for Class 1,
B according to IEC 651 for Class 1,
LF low frequency filter according to China requirements.