Ono Sokki DS-2000 Series User manual

ONO SOKKI CO., LTD.
DS-2000 Series
RTA Measurement
(Real-time Octave Analysis)

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Contents
1. Flow Chart to Measurement
2. Device Connections
3. Real-time Octave Analysis Setup
4. Starting Real-time Octave Measurement
5. Data Processing
1. Flow Chart to Measurement
Device connection
Calibration with sensors
Bar graph display
PAVE and PSUM operation
Level trend operation
Level trend 3D display
Lx display
Saving data
Copying and outputting data
Connect a sound level meter or microphone to
the DS unit. Perform sound pressure calibration
with each sensor.
Perform real-time octave band display, power
averaging, and level trend operation.
Display level trend 3D diagram and Lx
(percentile sound pressure level).
Save and output data.

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2. Device Connections
2-1 Device Connections
Connect the DS main unit and the PC.
Personal computer (notebook)
DS-2000 rear panel
ONOLINK II
→ PCMCIA
Key protector
(USB or parallel)
100VAC 100VAC

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2-2 Connecting a Detector
* When the MI-1211 and MI-3210 are
used, an option for direct input
(DS-0286/0287) is available.
* When the MI-1211 and MI-3210 are
combined, use the SR-1100
Microphone preamplifier.
* When the MI-1233/1431 and MI-3110 are combined,
use BNC cables for direct connection.
* With the LA Series sound level meter, connect the AC output and the input
section at the bottom of the DS-2000 with a supplied cable.

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3. Real-time Octave Analysis Setup
3-1 Input Source Setup
Select an input source depending on a sensor used. When using a constant-current microphone (a
combination of the MI-1233/1431 and MI-3110), select a constant current of 2.0mA.
Select “Voltage range” from the “Input” menu.
For Input Source, select a signal
source suitable for the sensor type.
3-2 Display Layout Setup
Select the number of screens to be displayed in and a screen layout of the measurement screen.
Select the number of screens.
Select a screen layout
(horizontal and vertical
arrangements).
* When multiple screens are displayed, left-click the comment area at the top left of each screen to
activate it.

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3-3 Calibration with Sensor
Perform calibration with a microphone. In the case of using a sound level meter, press the CAL
button to output a calibration signal. When a microphone is connected, insert the calibrator into the
microphone and output the calibration signal. (Do not change the level range after calibration.)
Make sure that the sensitivity of the input signal is not exceeded.
Decreases the sensitivity.
Select a sensitivity so that this
indicator does not light up in red.
Increases the sensitivity.
Select “Unit/Calibration”from the “Input” menu.
Press the Cal. butto n.
For calibration band,
select Allpass.
Enter a calibration value from the
keyboard or a numerical keypad which is
displayed by clicking the […] button.
Check Cal. Enabled.

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3-4 Displaying Instantaneous Data
Perform various setup of real-time octave analysis.
Select an input channel.
Select 1/1 or 1/3. Select a time constant
(movement of bar graph):
10ms, 35ms, 125ms (Fast),
630ms, 1s (Slow), 8s, or
Impuls.
Set a display range of the Y-axis.
Select “Y-Axis set” from the “Display” menu.
Set an upper-limit value
and display range of the X
axis.

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Similarly, select “Display data select” from the “Display” menu.
Select Graph.
Select a display channel.
Select INST for
instantaneous data
For microphone input, check
this box to apply A-
weighting only to overall.
Set a frequency-weightingfilter. If A-
weighting is set in the sound level meter,
select FLAT.

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3-5 Calculating Power Average (Equivalent Sound Level Leq)
Select “Measurement Time” from the “Input” menu.
Enter a measurement time.
Inverted during operation.
Press the START tool button.
Select “Display data
select” from the
“Display” menu, and
select P.AVG for
Type. When P.SUM is
input, the power
summation value is
displayed.

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Power average display
Power sum total value display