Svantek SV 971A, Руководство пользователя

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SV 971A User Manual
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Note: In case of the infinite integration period or the infinite repetition cycles the measurement
should be stopped manually with the <Stop> key
.
Day time limits
The Day Time Limits parameter defines the day and night time limits required
by the local standards. These limits are used for the calculation of the Lden
function (see Appendix D for definition). Two options are available: 6H-18H and
7H-19H . By default, it is set to 6H-18H .
Note: In the Simple interface mode, the Day Time Limits parameter is hidden, but the
instrument will use settings previously defined in the Advanced mode or default settings
(6H-18H)
.
Detector type
The LEQ Integration parameter defines the detector
type for calculation of the Leq , Lden , LEPd , Ln and Sel
results. Two options are available: Exponential and
Linear . The formulae used for the Leq calculation are
given in Appendix D. Its value by default is set to Linear . ►
Linear is required for obtaining the true RMS value of the measured signal. When this option is selected
values of the Leq , Lden , LEPd , Ln and Sel results do not depend on the detector time constant: Fast ,
Slow or Impulse (results are displayed without indication of detectors selected in profiles). In this case,
the indicator Lin. (or L ) is displayed in different views.
Exponential enables fulfilling the requirements of another standard for time averaged Leq
measurements. When this option is selected values of the Leq, Lden, LEPd, Ln and Sel results depend
on the detector time constant. Results are displayed with the indicator of the detector type selected in
the profiles (
path: <Menu> / Measurement / Profiles ).
Note: In the Simple interface mode, the LEQ Integration parameter is hidden, but the
instrument will use settings previously defined in the Advanced mode or default settings
(Linear)
.
Rolling Leq
In the two LRx Time positions, you can define integration periods for calculating
the LR1 and LR2 results (see Appendix D). Default values respectively: 30 m
and 60 m .
4.2 S
ETTING MEASUREMENT TRIGGER
–
M
EASUREMENT
T
RIGGER
The Meas. Trig. position appears only in the Advanced
interface mode and enables setting parameters of the
measurement trigger. The
Meas. Trig. is a contexts list
of parameters in which the trigger ( Trigger ) can be
switched Off or On by selecting the trigger type ( Slope+ ,
Slope
–
, Level+ , Level
–
or G ). In case the
trigger is on, additional parameters can be defined: the
measurement result that is checked for a trigger
condition (
Source ), its threshold level ( Level ) and the
speed of the Source value changing ( Gradient ).
<ENT>
Note: In the Simple interface mode, the Measurement Trigger position is hidden, but the
instrument will use settings previously defined in the Advanced mode or default settings
(Trigger: Off)
.
The trigger condition is checked every 0.5 milliseconds.