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

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3-6 Level Trend Analysis
Level trend analysis is performed to analyze how each band level changes with time.
Select “Level Trend Time” from the “Input” menu.
Select a sampling interval from
1ms to 10s.
Trend time length is determined by set Time
interval x 2000 (points).
Set the trend mode and then start trend analysis. When the measurement time has elapsed, trend
analysis automatically stops and trend operation starts.
Select “Display data select” from the “Display” menu.
Select this
tab.
Select Trend.

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Select the number of display data items.
Select frequency
weighting.
Select line color
respectively.
Set channel. Select a band subjected to trend data display.
Select “Trend XY-Axis set” from the “Display” menu.
Since the initial value is 400,
click [...] and enter 2000.
Select an
upper-limit
level and a
range.

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Level trend data
3D display of level trend
Select the Level Trend tab at the top left of the measurement screen.
Select “3D Trend” from the “Display” menu.
Select frequency weighting.
2D graph can be also
selected.
X:Band/Y:Time can
be also selected.

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Open Trend XY Axis Conditions.
Select Upper-limit level and Range
same as level trend setup.
The initial value is 400 same as
level trend setup, so enter 2000
(1999 is automatically displayed).
* Out of data for 2000 points, 1/3 octave band data for any desired point and level trend data for
any desired band are displayed by using the cursor.

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Displaying Lx
Lx operation for each band can be displayed using data for 2000 points sampled in level trend
analysis. Lx indicates the percentile sound pressure level with which the number (frequency) of
sampled data for each level is obtained. The DS-2000 simultaneouslydisplays L1, L5, L10, L50,
L90, L95, L99, Lmax, Lmin, and Lavg for each band.
Select the Lx ta b.
Select “Lx Data Display” from the “Display” menu.
Select the number of data to be displayed.
Select line color for L1 to
Lavg.by using the scroll bar.
Since the initial value is
400, and enter 2000.
Open “Trend XY-Axis set.” Then,
select Upper-limit level and Range
same as level trend setup.

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* Lx display for each band at 1kHz
Displays L1, L5, L10, L50, L90, L95, L99, Lmax, Lmin, and Lavg for each band. L1 to Lavg are
connected for each band.

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4. Outputting and Saving Data
4-1 Saving Display Data
This function saves the power averaging data, power total value, and other graph data displayed in
the measurement screen. (Trend data is saved by another operation.)
Select “Data Save” from the “File” menu.
Specify file name. Click Save to save data.
* Although the file name extension is only .spd, the saved file is a text
file and therefore can be loaded in Excel, etc.
4-2 Loading Saved Data
Data saved in a file can be loaded through the block memory.
Select “Block Memory” from the “Input” menu.
Select a block No. in which a
file is to be loaded.
Press the Recall button to load the file. Set the file to be loaded in the specified block No.

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4-3 Saving Level Trend Data
Level trend data is temporarily saved in the auto memory. The level trend data saved in the auto
memory can be saved in a file.
Select “Auto Memory” from the “Input” menu.
Set a comment as required. The
comment is reflected when a file is
loaded.
Select a channel of saved
data.
Check this box to save data in a
text file (that cannot be reloaded
by the application).
Specify file name. Press Save to save data.

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4-4 Loading Level Trend Data
The following procedure loads and displays level trend data saved in a file.
Select “Auto Memory” from the “Input” menu just as when saving the data.
Select a file to be loaded.
Press Open to load the file.

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4-5 Copy Function
Measurement data can be temporarily put in the clipboard. The data in the clipboard can be easily
pasted to other applications without saving.
Select “Copy set” from the “Edit” menu.
Select Bit Map or Text
using the option buttons.
Click OK to
apply the
settings.
After determining the data format with “Copy set,” select “Copy” from the “Edit” menu.
CAUTION:
1. The copyright of this procedure manual is reserved by Ono Sokki Co., Ltd.
2. Duplication without prior permission is prohibited.
3. This procedure manual explains general measurement procedures. Ono Sokki assumes no
responsibility for data obtained through a specific operation performed by the customer.