SVAN 973 User Manual
33
Note: In case of the infinite integration period or infinite repetition cycles the measurement
should be stopped manually with the <Start/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)
.
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 (
Level +
,
Level
–
or
Gr
). 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.
Level trigger
The
Level +
trigger starts the 1-second measurement/integration under the
condition: value of the RMS result (
Source
) integrated by 0,5 ms is greater than
the threshold value (
Level
). In other cases, the instrument continues checking the
trigger condition every 0,5 mc.
Summary of Contents for SV 973
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