Svantek SV 973, User Manual

Page: 34 / 212

SVAN 973 User Manual 34
When a new measurement cycle begins (after pressing the <Start/Stop> key or automatically after
previous measurement cycle stop) the instrument checks a trigger condition every 0.5 ms and starts
1-second integration if condition is met.
After 1-second integration, the instrument
repeats 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 a logger file.
The Level - 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” icon superimposes on the „wait” icon. /
Gradient trigger
The Gr 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 value ( Level ) and the gradient of the Source value is greater
than the gradient threshold value ( Gradient ). In other cases, the instrument
continues checking the trigger condition every 0.5 mc.
This trigger has the same logic as the Level + trigger, but the trigger condition requires also the gradient
threshold 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.