Sound Level Meter NL-42 / NL-52 Quick Instruction Manual

Sound Level Meter NL-42 / NL-52 Quick Instruction Manual
Sound Level Meter
NL-42 / NL-52
Quick Instruction Manual
(Ver.1.0)
Sound Level Meter
Sound Level Meter
Class 1 NL-52
Class 2 NL-42
RION CO., LTD.
Technical Support Division,
Sound and Vibration Measuring Instruments Business Department
November 9th, 2012
HU0-01
Contents
1. Controls and Functions..................................................................................................................................... 3
1-1. Front panel, Operation key panel.............................................................................................................. 3
1-2. Input/Output Connectors........................................................................................................................... 4
1-3. Measurement screen display ..................................................................................................................... 4
2. Preparations...................................................................................................................................................... 5
2-1. Power on/off.............................................................................................................................................. 5
2-2. Menu list screen ........................................................................................................................................ 5
2-3. Battery type............................................................................................................................................... 5
2-4 Battery status.............................................................................................................................................. 5
2-5. Output level range..................................................................................................................................... 5
2-6. Internal calibration .................................................................................................................................... 7
2-7. Acoustic calibration .................................................................................................................................. 7
2-8. Setting of the frequency weighting and the time weighting...................................................................... 9
3. Measurement ................................................................................................................................................ 100
3-1. Sound level measurement ..................................................................................................................... 100
3-2. Store operation ...................................................................................................................................... 111
(1) Manual mode operation .......................................................................................................................... 11
(2) Auto mode operation .............................................................................................................................. 14
(3) Timer Auto mode operation .................................................................................................................... 17
4. Data recall ...................................................................................................................................................... 20
4-1. Recalling stored data on sound level meter............................................................................................. 20
4-2. Recalling stored data on a computer ..................................................................................................... 222
5. Delay time, Pause, Back erase...................................................................................................................... 255
5-1. Delay time............................................................................................................................................. 255
5-2. Pause, Back erase.................................................................................................................................. 266
6. Marker............................................................................................................................................................ 28
7. Sub channel settings, Additional processing settings ..................................................................................... 29
8. Waveform recording....................................................................................................................................... 31
8-1. Manual recording .................................................................................................................................... 34
8-2. Level recording ....................................................................................................................................... 35
8-3. Interval recording.................................................................................................................................... 37
8-4. Total recording ........................................................................................................................................ 38
9. Other operations ............................................................................................................................................. 39
9-1. Stored data copy to a computer connected via USB ............................................................................... 39
9-2. Data recovery.......................................................................................................................................... 39
9-3. Screen hard copy..................................................................................................................................... 39
1
9-4. Key lock .................................................................................................................................................. 40
9-5. Eco setting (Power-saving mode) ........................................................................................................... 40
10. Menu list....................................................................................................................................................... 41
10-1. Menu list items of NL-42 and NL-52 ................................................................................................... 41
10-2. Menu list items of NX-42WR............................................................................................................... 41
2
1.Controls and Functions
1-1.Front panel, Operation key panel
This sound level meter has the following display and key panel.
Several settings such as frequency weighting, time weighting and other parameters for measurement are set
from the menu list.
The display supports various languages, and enables user-friendly, intuitive operation, designed to be used
comfortably, also by persons who are inexperienced in measurements.
Microphone
Preamplifier
Display
Indicator LED
Lights/fashes in red or blue
to indicate the operation or
status of the unit.
PAUSE/CONT key
Press the key to pause
measurement, and press the key
again to resume measurement.
START/STOP key
Press to start or stop the measurement
CAL key
This key is used for calibration of
the unit and for level calibration of
connected equipment.
MENU/ENTER key
Press this key to make or finalize the setting
of an item in a menu or any other setting.
When the key is pressed at the measurement
screen, the menu list screen comes up.
key
These four keys serve for selecting
and setting items on menu screens.
DISPLAY key
This key switches measurement
screen display.
POWER key
Turns power to the unit on and off.
LIGHT key
This key turns on the display
backlight. Press the key again to
turn the backlight off.
Bottom cover
This cover protects the connectors on
the bottom during transport or storage.
Removing the cover gives access to the
connectors.
3
1-2.Input/Output Connectors
A variety of I/O connections is available.
1-3.Measurement screen display
The illustration below shows all elements of the display for explanation purposes.
In actual operation, such a screen will not be shown.
4
2.Preparations
2-1.Power on/off
Power on : Hold down the POWER key until the power-on screen appears (at least 1 second).
Power off : Hold down the POWER key until the unit is turned off (several seconds).
2-2.Menu list screen
① When the measurement screen is displayed, pressing the MENU/ENTER
key brings up the menu list screen as shown to the right.
② Use the
/
/
/
keys to select the desired menu item and press
the MENU/ENTER key.
③ Pressing the DISPLAY key displays the explanation (help) screen of the
item that has been selected.
④ Pressing the PAUSE/CONT key switches back to the previous screen.
⑤ Pressing the START/STOP key switches back to the measurement screen.
2-3.Battery type
In this menu item, you can select the type of battery used for the unit.
The battery power corresponding to the selected battery is displayed on the measurement screen.
From the [System(Language)] menu, select [Battery type] and press the MENU/ENTER key. The battery
type screen appears.
Use
/
the keys to select the battery type (Alkaline, Ni-MH [Nickel-metal hydride]) and press the
MENU/ENTER key.
If [Battery type] is set to the wrong type, the unit might be working but the battery life becomes shorter.
In addition, the battery status cannot be indicated in correct indicator segments.
This is because alkaline battery voltage is about 1.5 V and Ni-MH battery voltage is about 1.2 V.
Therefore, [Battery type] must be set correct.
2-4.Battery status
When the unit is operated on battery power, you should regularly check the battery indication
.
The number of white segments will decrease as the batteries get used up. When the indication starts to
flash in red, replace the batteries with a fresh set.
2-5.Output level range
The unit can measure without switching ranges. It is single range.
However, the output level range and bar graph level range of the unit need to be set, in order to connect
signal outputs to a Data Recorder or Level Recorder.
5
Especially when the unit is connected to a Level Recorder, Data Recorder or Frequency Analyzer, it is
necessary to consider the Dynamic Range.
For example, when the unit is connected to a Level Recorder, whose dynamic range is maximum 50 dB, if
the full scale output of the unit is set to 130 dB, the Level Recorder would record the data in the range
from 80 dB to 130 dB. Therefore it cannot record below 80 dB.
On the other hand, if the full scale output of the unit is set to 90 dB, the Level Recorder would record data
in the range from 40 dB to 90 dB.
AC output and DC output specifications are shown below.
・AC output voltage:
1 V(rms) at display full-scale point
・DC output voltage:
2.5V, 25 mV/dB at display full-scale point
The procedure for setting the upper scale value of the bar graph and full scale of output voltage is as
follows:
① Select [Display] on the menu list and select [Output Level Range Upper].
② Use the △/▽ keys to set the value (70 to 130, 10 dB steps). Then press the MENU/ENTER key.
③ Return to the Measurement screen and confirm that the output level range has changed.
Also confirm the upper scale value of the bar graph.
(For example, full scale settings of 130 dB and 90 dB are shown below)
In case full scale of output
In case full scale of output
level range is 130 dB.
level range is 90 dB.
・Reference
Set the lower Output level range.
Select [Output Level Range Lower] and press the MENU/ENTER key.
Use the △/▽ keys to set the value (20 to 80, 10 dB step).
Then press the MENU/ENTER key. This setting does not affect the output level.
6
2-6.Internal calibration (Electrical calibration)
Before and after a measurement, the unit must be calibrated.
Calibration is carried out using a signal generator (1 kHz, sinusoidal wave) built into the unit.
The procedure for internal calibration is described below.
① Press the CAL key. Verify that “Internal Calibration” is displayed in the upper part of the screen.
② If “Acoustic Calibration” is shown in the upper part of the screen, press the DISPLAY key. The
calibration mode will change to “Internal Calibration”.
③ Confirm that the calibration value indication shows 124 dB steadily. If the bar graph upper limit
setting is not 130 dB, a value of [Output Level Range Upper -6 dB] will be flashing as the value on the
calibration value indication.
“Internal Calibration” is displayed
Use the △ / ▽ keys to bring the level
indication to the specified value (124.0 dB).
④ Use the △/▽ keys to bring the level indication to the specified value (124.0 dB).
⑤ When calibration to 124.0 dB is completed, press the CAL key once more to return to the
measurement screen.
Note: If the bar graph upper limit setting is not 130 dB, bring the level indication to a value that is 6 dB
below the current upper limit of the bar graph scale.
2-7.Acoustic calibration (with sound calibrator)
To confirm the microphone sensitivity, you need to execute acoustic calibration using a sound calibrator.
The procedure for acoustic calibration is described below.
If the output level range should be changed, refer to “2-5. Output level range”.
① Turn off the Sound Calibrator NC-74 and NL-42/NL-52.
② Insert the microphone very carefully and slowly all the way into the coupler.
③ Set the power switch of the Sound Calibrator to ON.
④ Set the frequency weighting as described below.
Refer to “2-8. Setting of the frequency weighting and the time weighting”.
・When using the Sound calibrator NC-74:Select the frequency weighting A, C, or Z.
⑤ Press the CAL key. A calibration screen appears.
7
⑥ Verify that “Acoustic Calibration” is displayed in the upper part of the screen. If “Internal
Calibration” is shown in the upper part of the screen, press the DISPLAY key. The calibration mode will
change to “Acoustic Calibration”.
Use the △/▽ keys to adjust the reading of the NL-42/NL-52 to the value shown in the table below.
These values were derived taking into consideration the relationship between the sound pressure level at
the microphone in the coupler (specified sound pressure level) and the influence of case reflections and
the microphone refraction effect when placed in a sound field.
Calibrator
Calibration value of NL-42
Calibration value of NL-52
Sound Calibrator(NC-74)
93.9 dB
94.0 dB
"Acoustic calibration" is displayed.
LA or LC or Lz.
Use the △/▽ keys to bring the
level indication to the specified
value.
《Example of calibration display using sound calibrator NC-74》
⑦ Press the CAL key. The measurement screen returns.
⑧ Restore the frequency weighting.(refer to ⑤)
⑨ Turn off the Sound Calibrator NC-74 and the NL-42/NL-52.
⑩ Remove the microphone very carefully and slowly from the coupler.
8
2-8.Setting of the frequency weighting and the time weighting
Frequency weighting
Time weighting
① Press the MENU/ENTER key to bring up the menu list screen.
② On the touch screen, select the frequency weighting characteristic for the main channel. Each press
on the “Freq” field with the finger cycles through the following settings “A”, “C”, “Z”.
(The frequency weighting characteristic can also be set using the [Measure] screen in the menu list
screen.)
Frequency weighting
Time weighting
③ Select the time weighting characteristic for the main channel on the touch screen. Each press on the
“Time” field of the touch screen with the finger cycles through the following settings “F (Fast)”, “S
(Slow)”.
(The time weighting characteristic can also be set using the [Measure] screen in the menu list
screen.)
④ Pressing the START/STOP key switches back to the measurement screen.
9
3.Measurement
3-1.Sound level measurement
① Press the MENU/ENTER key and select the frequency weighting characteristic on the touch screen.
②
③
Set the frequency weighting as described below.
・A-weighted sound pressure level:
“A” setting.
・C-weighted sound pressure level:
“C” setting.
・Z-weighted sound pressure level:
“Z” setting.
Set the time weighting as described below.
・Time weighting F(Fast):
・Time weighting S(Slow):
“F(Fast)” setting.
“S(Slow)” setting.
④ Pressing the START/STOP key switches back to the measurement screen.
⑤ The level indication shows the currently measured sound level (sound pressure level). The reading is
updated once every second and the bar graph update frequency is 100 ms.
(An example of a measurement screen with settings for time weighting F and frequency weighting A
is shown below.)
Bar graph
Frequency weighting
Display of sound level
Time weighting
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3-2.Store operation
(1) Manual mode store operation
All processed data except sound level are considered as a single data set, and the operator stores the data
sets one-by-one manually.
When the operator performs the store operation after a measurement, each processed value and
measurement condition will be stored with the time value.
If no SD memory card is inserted, the data will be stored in the internal memory of the unit. If an SD
memory card is inserted, the data will automatically be stored on the card. Data store capacity is shown
below.
Memory
Data store capacity
Internal memory capacity
Max. 1000 data sets
SD memory card capacity
Max. 1000 data sets per store name, Max. 100 store names
● The procedure is as follows:
① Measurement settings as described in chapter “3-1 Sound level measurement” must be completed
beforehand.
② To select the measurement values Leq, LE, Lmax, Lmin and LN (N = 05, 10, 50, 90, 95) you want to
display, set the desired items to ON in the [Display] screen from the menu list screen.
In addition, the display setting of a measured value can be changed between ON and OFF again after
a measurement.
Refer to the figure below.
ON or OFF
11
③ Bring up the menu list screen and select [Store].
Manual mode setting is as follows. The store name only appears when a SD memory card is inserted.
Setting item
Setting
Store mode
Manual
Store name
Number of four digits
Measurement time
10 s / 1 min / 5 min / 10 min / 15 min / 30 min / 1 h / 8 h / 24 h / Manual
arbitrary measurement time (maximum 24 hours)
Manual mode
Number of four digits
Measurement time
12
④ Back to the measurement screen, the
Use the △/▽ keys to
currently selected address is shown on
set store address
the screen. The △/▽ keys can be used
to specify the address in the range from
0001 to 1000. (If the address is shown
in red, it already contains data. Take
care not to overwrite data that you want
to keep.)
⑤ Press the START/STOP key to start the measurement. While the measurement is in progress, the
symbol flashes and the elapsed time is displayed. In addition, the indicator LED flashes red. When the
measurement time has elapsed, the measurement is terminated automatically. To terminate the
measurement before the pre-set time, press the START/STOP key.
While the measurement is in
progress,
the
symbol
flashes and the elapsed time is
displayed. In addition, the
Press the START/STOP key to
indicator LED flashes red.
start the measurement
⑥ When the measurement finishes, a confirmation screen will be displayed.
Select “Data saved” and press the MENU/ENTER key to store the
processing results in the internal memory or on the SD memory card.
When you select “Cancel”, the processing result is not saved.
(NB: All processed data are stored, whether you have displayed a processed value on the
measurement screen or not.)
⑦ The measurement results are displayed. Each press of the “DISPLAY” key cycles through the displays
“Time-Level screen” and “Measurement screen”.
Press
the
“DISPLAY”
Press the “DISPLAY” key
key. Press the key two
times
when
several
processing values exist.
13
(2) Auto mode operation
The optional Extended Function Program NX-42EX should be installed.
An SD memory card should be inserted in the card slot.
The data will automatically be stored on the card.
With the Auto mode, Lp store and Leq store are executed simultaneously
(Separate operation is also possible).
・ Lp store
This is useful when recording the sound level time profile. The sound level of up to 1,000 hours can be
stored continuously and automatically.
Stored data:Lp or Leq,1s(refer to note of next page)
Store interval:Can be selected from 100 ms / 200 ms / 1 s / LAeq,1s(Leq per second), OFF(= Lp is not
stored)
・ Leq store
All processed data except sound level are considered as a single data set, and up to 100,000 data sets can
be stored continuously and automatically. This is suitable for a measurement over a specified long
period of time.
Stored data:Leq, LE, Lmax, Lmin, Ly (Sub channel), LN (Percentile sound level)
Processing interval: can be selected from 10 s / 1 min / 5 min / 10 min / 15 min / 30 mim / 1 h / 8 h / 24
h / manually selected time (up to 24 hours), OFF(= Leq is not stored)
Approximate times and data capacity are listed below.
Measurement parameter
Data capacity, Stored time
Approximate stored data When a 24 hours measurement is executed with a Lp store interval of
capacity per a day
100 ms and a Leq processing interval of 10 min, the data capacity is
approximately 74 Mbytes per day.
Approximate Lp stored data When a 1 hour measurement is executed with a Lp store interval of
capacity
Approximate
data capacity
100 ms, the data capacity is approximately 3 Mbytes per hour.
Leq
stored When a 24 hour measurement is executed with a Leq processing
interval of 10 min, the data capacity is approximately 20 kbytes.
When a SD memory card When a measurement is executed with a Lp store interval of 100 ms
of 2 GByte (effectively 1.9 and a Leq processing interval of 10 min, data can be stored for
GByte) is used
approximately 25 days.
(calculation: 1.9 GByte / 74 MByte = 25.7 → approximately 25
days)
14
● The procedure for Auto store operation is as follows:
① Measurement settings as described in chapter “3-1 Sound level measurement” must be completed
beforehand.
② To select the measurement values Leq , LE, Lmax, Lmin and LN(N = 05, 10, 50, 90,
95)you want to display, set the desired items to ON in the [Display] screen from
the menu list screen.(Refer to the figure on the right.)
(In addition, the display setting of a measured value can be changed between ON
and OFF again after a measurement.)
ON or OFF
③ Bring up the menu list screen and select [Store]. Make the settings as follows:
Setting item
Setting
Store mode
Auto
Store name
Number of four digits
Total measurement time
Can be selected from 10 s / 1 min / 5 min / 10 min / 15 min / 30 min / 1 h /
8 h / 24 h / arbitrary measurement time (maximum 24 hours).
Lp store interval
Can be selected from OFF / 100 ms / 200 ms / 1 s / Leq,1s.
When “Leq,1s” is selected, Leq data per 1 sec is stored.
When “OFF” is selected, Lp store is not executed.
Leq processing interval
Can be selected from OFF / 10 s / 1 min / 5 min / 10 min / 15 min / 30 min
/ 1 h / 8 h / 24 h / arbitrary measurement time (maximum 24 hours).
When “OFF” is selected, Leq store is not executed.
Auto mode
Number of four digits
Measurement time
Lp store interval
Leq processing interval
15
④ Press the START/STOP key to start the measurement. While the measurement is in progress, the
symbol flashes and the elapsed time is displayed. In addition, the indicator LED flashes red.
While the measurement is in
progress, the
Press the START/STOP key to
symbol flashes
and the elapsed time is displayed.
start the measurement
In addition, the indicator LED
flashes.
The measurement values will be stored on SD memory card automatically at every interval set for the Leq
calculation interval.
When a calculation interval is completed, the address is incremented by one step.
The address is incremented by one step at every
completed interval set for Leq calculation interval.
⑤ Measurement and data store will stop when the end of the total measurement time is reached. To stop
the process earlier, press the START/STOP key.
※Note
Only when the Lp store interval is set to 100 ms, the quantities Leq, Lmax, Lmin, Ly as well as Lp data are stored.
When Lp store interval is set to another value than 100 ms, only Lp data is stored.
When the Lp store interval is set to [Leq,1s], the data of Leq per second is stored.
Only when the sub channel is ON and the additional processing value is set to LCpeak or LZpeak, Ly data is
stored.
However, when recalling data on the unit, only Lp data stored in memory is displayed on the recall screen.
Other stored data can be viewed by downloading it to a computer.
16
(3) Timer Auto mode operation
● About Timer Auto mode operation
The optional Extended Function Program NX-42EX should be installed. An SD memory card should be
inserted.
Auto store is executed using a set start time, stop time and, if set, a Timer Auto interval. Refer to the
figure below. With the Timer Auto mode, Lp store and Leq store are executed simultaneously (but
separate operation also possible).
About Lp store and Leq store, refer to the above mentioned “(2) Auto store operation”
set Start time
set Stop time
Leq processing interval
Lp store interval
Timer Auto store operation, when Timer Auto interval is set to OFF.
Lp store, Leq processing and
Leq store are executed.
set Start time
set Stop time
Leq processing interval
Leq processing interval
Standby(sleep mode)
Measurement cycle set as
Timer Auto interval
Leq processing interval
Standby(sleep mode)
Measurement cycle set as
Timer Auto interval
Timer Auto store operation, when Timer Auto interval is set.
● To set up a Timer Auto store measurement, the procedure is as follows:
① Settings as described in chapter “3-1 Sound level measurement” must be completed beforehand.
② To select the measurement values Leq, LE, Lmax, Lmin and LN(N = 05, 10, 50, 90, 95)
you want to display, you set the desired items to ON in the [Display] screen from the
menu list screen. (Refer to the figure on the right.)
(In addition, the display setting of a measured value can be changed between ON
and OFF again after a measurement.)
ON or OFF
17
③ Bring up the menu list screen and select [Store]. Make the settings as follows:
Setting item
setting
Store mode
Timer Auto
Store name
Number of four digits
Lp store interval
Can be selected from OFF / 100ms / 200ms / 1s / Leq,1s.
When “Leq,1s” is selected, Leq data per 1 sec is stored.
When “OFF” is selected, Lp store is not executed.
Leq processing interval
Can be selected from OFF / 10s / 1min / 5min / 10min / 15min / 30min /
1h / 8h / 24h / arbitrary measurement time (maximum 24 hours).
When “OFF” is selected, Leq store is not executed.
Start time
Sets the start time(year, month, day, hour, minute)
Stop time
Sets the stop time(year, month, day, hour, minute)
Timer Auto interval
Sets the Timer Auto interval
(The “Timer Auto interval” is the time between measurements.)
Can be selected from OFF / 5min / 10min / 15min / 30min / 1h / 8h / 24h.
When “OFF” is selected, Timer Auto interval is not available.
Standby
When sleep mode is enabled, the unit will enter a power-saving standby
(Sleep mode)
condition at 60 seconds after pressing the START/STOP key and during
intervals between measurements. In this mode, power consumption is
reduced to about 1/10.
Timer Auto mode
Start time
Number of four digits
Stop time
Lp store interval
Timer Auto interval
Leq processing interval
Sleep mode
④ When Sleep mode is selected, the unit will enter a power-saving standby condition at 60 seconds after
initiating the measurement by pressing the START/STOP key and during intervals between
measurements, until the measurement start time comes.
The LCD panel is off, and the indicator LED flashes in blue once every 5 seconds.
To check the measurement settings in standby condition, press the LIGHT key. The display will turn
on temporarily and will turn itself off again if no further operation steps are taken.
⑤ When start time has been reached, measurement will start.
18
While the measurement is in progress, the
symbol flashes and the elapsed time is displayed. In
addition, the indicator LED flashes red.
While the measurement is in
progress, the
Press the START/STOP key to
symbol flashes
and the elapsed time is displayed.
start the measurement
In addition, the indicator LED
flashes
The measurement value will be stored on the SD memory card automatically at every interval set for Leq
calculation interval.
When a calculation interval is completed, the address is incremented by one step.
The address is incremented by one
step at every interval set for Leq
calculation interval.
アドレスが繰り上がります。
⑥ When Timer Auto interval as well as sleep mode are set, the unit will enter in standby condition after
passing of the time set by the Leq processing interval and having completed data store, until the next
storing starts.
⑦ Measurement and data store will stop when the end of the total measurement time is reached. To stop
the process earlier, press the START/STOP key.
19
4.Data recall
4-1.Recalling stored data on the screen of the sound level meter
● About data recall
This is the function to read out the stored data from the internal memory or SD memory card.
● The procedure is as follows:
① Press the MENU/ENTER key and select [Recall] on the menu list screen.
The recall screen appears.
② Use the
/
keys to select a location of saved data and the △/▽ keys to select a data file.
The location of saved data can either be “Internal Memory Manual”, “SD Manual”, “SD Auto
Lp” or “SD Auto Leq”.
Without an SD memory card, only “Internal Memory Manual” is available.
③ Select a data file and press the MENU/ENTER key. The file processing screen appears.
④ Select [Confirm the data] and press the MENU/ENTER key. Refer to the figure above.
⑤ Stored data is displayed.
・ Recall screen of Manual store data.(Internal memory Manual, SD Manual)
Use the △/▽ keys to select the address of which
you want to display the processing result.
File name
Processing result
20
・ Recall screen of Lp store data in Auto mode.(SD Auto Lp)
(a) Numeric screen of Lp store data
Use the △/▽ keys to select the address of
which you want to display the Lp store data.
File name
Lp store data
(b) Time-Level screen of Lp store data
Press the Display key, the screen will switch to Time-Level screen.
The address and cursor can be changed using the
/
keys.
The time scale can be changed using
the △/▽ keys.
・ Recall screen of Leq store data in Auto mode.(SD Auto Leq)
⑥ Pressing the PAUSE/CONT key switches back to the menu list screen.
Pressing the START/STOP key switches back to the measurement screen.
Use △/▽ keys to select the address of which
you want to display the processing results.
File name
Processing results
21
4-2. Recalling stored data on a computer
● Outline
Stored data can be recalled on a computer.
The unit will be recognized as a removable disk when connected to a computer.
To make the connection, use a generic USB cable (standard A male to mini B male connector).
In this case, select [I/O] from the menu and set the [Communication Interface] to OFF.
In addition, the ejected SD card can be read by a computer using a generic memory card reader.
In order to back up the stored data, we recommend that stored data is copied to a computer from the
SD memory card.
Data stored on the SD memory card are in CSV format.
Therefore these files can be opened directly in spreadsheet software, for example Microsoft Excel.
The procedure is described below.
For Auto store data or Timer Auto store data, we recommend using RION Data Management
Software for Environmental Measurement AS-60.
Various files and subdirectories created on the card are described below.
/NL-42 ―
―
/Manual_####
- /NL_001_SLM_MAN_####_0000.rnd
/Auto_####
-/AUTO_LEQ/NL_001_SLM_Leq_####_0001.rnd
-/AUTO_LP /NL_001_SLM_Lp _####_0001.rnd
-/Auto_####.rnh
※
indicates subdirectory and underlined part indicates file.
※ #### is the file's store name as was set in the sound level meter.
※ The files with the extension rnd are stored data files.
※ The files with the extension rnh are header files containing the measurement
settings.
22
● The procedure to open data in spreadsheet software is as follows:
① Start spreadsheet software (for example Excel) and click “File Open”.
② Select the folder containing the data file, make sure to select “All files” at file type.
Select “All files”
③ Select a stored data file displayed in the dialog box and click “Open” button.
④ The dialog box below appears, then select “Delimited - Characters such as commas or tabs separate
each field” and click “Next”.
⑤ Select ”Comma” and click “Finish”
23
⑥ The selected data file will be opened.
《Manual store data, opened in Excel》
《Auto store Lp store data, opened in Excel》
《Auto store Leq store data, opened in Excel》
24
5.Delay time, Pause, Back erase
5-1.Delay time
● Outline
A delay in starting a measurement from the point of pressing the START/STOP key can be set.
This function is useful for excluding the operating sound made when pushing the start key and the sound of
the operator's footsteps. Refer to the figure below.
Press the START/STOP key
Measurement start
Execute measurement and data
store
The delayed measurement
time set by “Delay Time”
● The procedure to set the delay time is as follows
① Select [Measure] from the menu list and select [Delay Time].
② The delay time is selected from OFF, 1, 3, 5 or 10 sec and set to it.
③ Set the other required measurement and data store parameters.
④ Return to the measurement screen. Delay time will display on the screen at the upper right.
⑤ Press the START/STOP key to start the measurement. Measurement will start after the preset delay
time has elapsed.
Set delay time
遅延時間の設定
Standby (flash)
Measuring (flash)
After the preset delay time
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5-2.Pause, Back erase
● Outline
Note:
Only when the store mode is Manual, the Pause and Back erase functions are available.
When the store mode is Auto or Timer Auto, these functions are not available.
・ Pause
During a measurement, the PAUSE/CONT key can be used to exclude unwanted events from
processing. Press the key to pause a measurement, and press the key again to resume the measurement.
Data exclude interval
Measurement start
PAUSE/CONT
PAUSE/CONT
Press the key
Press the key
Resume the measurement
Resume the measurement
・ Back erase
The Back erase function makes it possible to exclude data from processing for an interval of several
seconds (1, 3 or 5 second(s)) before the PAUSE key was pressed.
Data exclude interval
Measurement start
PAUSE/CONT
PAUSE/CONT
Press the key
Press the key
Resume the measurement
Resume the measurement
Back erase time
26
● The procedure for setting the Back erase time is as follows
① Select [Store] from the menu list and select [Store Mode].
Select the Manual mode.
(When the store mode is Auto or Timer Auto, the Pause and Back erase functions are not available.)
② Select [Measure] from the menu list and select [Back Erase].
③ Select the Back erase time of 1s, 3s or 5s. When this function is not needed, select OFF.
④ Set the other required measurement and data store parameters.
⑤ Return to the measurement screen. When Back erase function is available, “BE#” will be displayed on
the screen at upper center. (# is Back erase time)
⑥ Press the START/STOP key to start a measurement.
⑦ When PAUSE/CONT key is pressed while performing a measurement, the previous data is removed
for the preset Back erase time.
Refer to the figure below.
Back erase time is set to
5 seconds.
When
pressing
the
PAUSE/CONT
key,
[BACK ERASE] appears on the screen.
The pause symbol
⑧ When the Back erase function is applied, the Time-Level screen is convenient.
To display the Time-Level screen, press the DISPLAY key.
Data excluded by the Back erase function are indicated on the display as follows:
Data excluded by Back erase function.
⑨ The PAUSE/CONT key is pressed to resume measuring.
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6.Marker
● Outline
When the store mode is set to Auto or Timer Auto, and the Lp store interval is specified, a marker can be
added to the data. Pressing △ key or ▽ key will add the corresponding marker to the data.
If the marker is added to a target event, the marker helps to distinguish between the target sound and
background noise. There are two markers available, marker 1 and marker 2.
In addition, markers added with this function can be visualized with a Data Management Software for
Environmental Measurement AS-60.
● The procedure to set a marker is as follows:
① Select [Store] from the menu list and select [Store Mode].
Select the Auto or Timer Auto mode.
(When the store mode is Manual, the Marker function is not available.)
② Set the other required measurement and data store parameters.
③ Press the START/STOP key to start a measurement.
④ When the Marker function is to be used, the Time-Level screen is convenient.
To display the Time-Level screen, press the DISPLAY key.
Pressing the △ key will insert marker 1, ▽ key will insert marker 2.
These markers are indicated on the display as follows.
Interval attached to marker 1.
Interval attached to marker 2.
⑤ Also on the measurement screen, each marker can be added.
When Press △ key or ▽ key, “MARKER-1”or ”MARKER-2” will be displayed on the screen.
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7. Sub channel and additional processing value measurement
● Outline
When the sub channel is set to ON, the sub channel Lp value can be displayed with the main channel Lp
value on the measurement screen.
When the sub channel is set to ON, one of the following additional processed quantities is available in
addition to Leq, LE, Lmax, Lmin, and LN.
LCeq: C-weighted equivalent continuous sound level.
LCpeak: C-weighted peak sound level.
LZpeak: Z-weighted peak sound level.
LAIeq: I-time-weighted equivalent continuous sound level.
LAtm5: Tact-max A-weighted sound level.
LAImax: Maximum I-time-weighted sound level.
Note: When the optional Extended Function Program NX-42EX is not installed, LAIeq and LAImax cannot
be measured.
Main channel level value
Sub channel level value
● Procedure to set the Sub channel
① Set the [Sub Channel Setting] to ON in the [Measure] screen from the menu.
② Set the Frequency Weighting and Time Weighting of the Sub channel to appropriate values.
③ Set the additional processing function, which depends on the set values in the previous step. Details
are as follows:
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① Set to ON
② Frequency Weighting and Time Weighting
③ Set the additional processing function
※ Caution
・ When data store is executed with the sub channel set to ON and the additional processing function
set to ON, the main processing values and the additional processing values are saved as Manual
stored data or Auto stored Leq data. All the stored data can be displayed by the Recall operation.
If the stored data is displayed by PC, the additional processing values are stored in the Ly column.
・ The instantaneous values Lp of sub channel are not stored, even though the sub channel setting is
set to ON. Thus the instantaneous values Lp of the sub channel are not displayed when you try to
recall the Auto stored data. However, the additional processed data are saved in the Ly column of
the main part of the stored data, and you can see the Lp data only on a PC, only when the Lp store
interval was set to 100ms and the additional processing function setting was set to LCpeak or LZpeak.
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8. Waveform Recording function
● Outline
When the Waveform Recording program NX-42WR is installed, this function enables users to record a
sound pressure waveform on SD card as a WAVE file of PCM form, together with the stored numerical
data. The recorded WAVE files can be played on computer and can be used for frequency analysis.
● Outline of the waveform recording function
■ Recording mode
There are two recording modes: event mode and total mode.
・Event mode
The event mode can only be used when Auto store (Auto or Timer Auto) is selected.
Three types of recording are available:
(1) Manual recording
The sound pressure waveform of arbitrary, user defined time is recorded during Auto store.
(2) Level recording
The sound pressure waveform is recorded only when the input signal is higher than the preset
level.
(3) Interval recording
The sound pressure waveform is recorded at a pre-set fixed interval (10min / 1h).
・Total mode
(4) Total recording
In Auto store mode, the sound pressure waveform is continuously recorded during the
measurement. In Manual store mode, the sound waveform is recorded during the entire
measurement and stored after finishing the measurement.
■ Sampling frequency
The sampling frequency can be chosen from 48 kHz, 24 kHz, and 12 kHz, depending on the maximum
sound frequency which you want to analyze. When you want to record in high-quality sound, set to a high
sampling frequency. When you do not need a high sound quality, or you want to record for a long time,
set to a low sampling frequency.
■ Bit length
The recording bit length can be selected from 16 bits and 24 bits. Increased accuracy of analysis and
better sound quality can be obtained as the bit length value increases.
■ Approximate recording times for SD memory cards
・Data apply for Auto store, bit length 16bit,
Lp store interval 100ms.
・ The duration of recording with 24bit
becomes shorter than that with 16bit.
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■ Playback and analysis of recorded files
・Playback of recorded files
Recorded files can be played with WAVE file playback software (on public sale) or with the
Waveform analysis software DA-20PA1, DA-40Viewer or AS-60 from RION. Playback on the
NL-42/NL-52 is not possible.
・Analysis of recorded files
Analysis (playback is also possible) of recorded files can be done with the Waveform Analysis
software CAT-WAVE from RION. Analysis by DA-20PA1/DA-40Viewer is not possible.
● Display explanation
■ Recording screen
・Recording mode and number of recorded files
The recording mode and the number of recorded files during measurement are shown.
The selected recording mode is expressed by a letter-symbol.
“M” stands for Manual recording. “L” stands for Level recording. “I” stands for Interval recording. “T”
stands for Total recording.
The name of the recorded file under measurement is expressed as a code of 4 digits.
Manual recording, level recording and interval recording can be set simultaneously. You can check the
operation condition and recorded file number while recording.
■ Menu screen
After
finishing
the
measurement,
wave
recording
information in the measurement screen disappears. However
you can check the information in the menu screen.
32
● Store format of waveform recording data
■ Store destination folder
Files are saved in the sub folder SOUND which is created in the store folder specified by the store name.
Example: Manual_0123/SOUND (with Manual store)
Auto_0123/SOUND (with Auto store)
■ File name of waveform recording data
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8-1. Manual recording
● Outline
Manual recording allows recording of the sound pressure waveform for any duration during Auto store
operation. This type of recording is suitable when the operator is able to control the recording function
manually as necessary.
● Operation procedure
① Set [Store Mode] in the Store menu list screen to “Auto” or “Timer Auto”, and make the required
setup.
② Make settings in the wave recording screen as shown below.
③ Press the START/STOP key or press the PAUSE key several times to return to the measurement
screen.
④ Press the START/STOP key to start the Auto store operation.
⑤ When you press the MENU/ENTER key, waveform recording starts, including the data from a set
pre-time before this point. When you press the MENU/ENTER key again, recording stops. The
operation principle of manual recording is shown below.
※Note
・ The maximum recording duration for one manual recording session is pre-time plus one hour.
Recording stops automatically when the recording duration excluding pre-time reaches one hour.
・ During Auto store, two or more manual recordings are possible.
34
8-2. Level recording
● Outline
When Level recording is set to “ON”, recording executes while the level exceeds the trigger level. It is
used in order to record only high sound levels.
● Operation procedure
① Set [Store Mode] in the Store menu list screen to “Auto” or “Timer Auto”, and make the required
setup.
② Make settings in the wave recording screen as shown below.
③ Press the START/STOP key or press the PAUSE key several times to return to the measurement
screen.
④ Press the START/STOP key to start the Auto store operation.
⑤ When a signal higher than the preset trigger level is measured, waveform recording starts, including
the data from 1 second before this point. Recording stops when the signal falls below the trigger level,
after a fixed post-recording period of 5 seconds. If the level rises again above the trigger level during
these 5 seconds, recording continues without interruption.
⑥ Recording stops when the preset recording time has elapsed. To terminate recording sooner, press the
START/STOP key. The operation principle of level recording is shown below.
35
※Note
・ When the maximum recording time is set to “OFF”, files are divided at 1 hour.
・ When the maximum recording time is set to 10 minutes, recording will stop after 10 minutes, also
when sound still continues to exceeds the trigger level for a longer time (such as the sound of an
idling car). This is helpful to prevent unnecessary use of SD memory card capacity.
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8-3. Interval recording
● Outline
When Interval recording is set to “ON”, recording starts at preset intervals. The interval can be selected
as 10 minutes or 1 hour. The recording time can be selected as 15 seconds or 1 minute.
This function can be used to record environmental sound on certain fixed periods.
● Operation procedure
① Set [Store Mode] in the Store menu list screen to “Auto” or “Timer Auto”, and make the required
setup.
② Make settings in the wave recording screen as shown below.
③ Press the START/STOP key or press the PAUSE key several times to return to the measurement
screen.
④ Press the START/STOP key to start the Auto store operation. Waveform recording will start at the
preselected intervals and with preselected recording times.
⑤ To stop the measurement, press the START/STOP key. The operation principle of interval recording is
shown below.
※Note
When the store mode is Timer Auto, the actual recording interval will be equivalent to the Timer Auto
intervals.
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8-4. Total recording
● Outline of Total waveform recording
In Auto store mode, the sound waveform will be recorded continuously during measurement.
In Manual store mode, the sound waveform is recorded during the entire measurement and stored after
finishing the measurement.
● Operation procedure
① Select [Store Mode] in Store menu list screen to “Manual”, “Auto” or “Timer Auto”, and make the
required measurement setup.
② Make settings in the wave recording screen as shown below.
③ Press the START/STOP key or press the PAUSE key several times to return to the measurement
screen.
④ Depending on the store mode, the operation method is as follows:
・ In case of Manual store
Press the START/STOP key to start a measurement, and press the START/STOP key again to stop.
To save the measurement data and recorded wave data, select [Store data] on the data save
confirmation screen which appears when the measurement is stopped.
During a recording session, the PAUSE/CONT key (Pause function) can be used but the back
erase function is not available.
The operation principle of total recording with Manual store is shown below.
38
・ In case of Auto store or Timer Auto store
When you press the START/STOP key to start Auto store, waveform recording also starts
simultaneously. Files are created and saved for each recording period. To stop recording, press the
START/STOP key. During Auto store, the PAUSE/CONT key (Pause function) cannot be used.
9. Other operations
9-1. Data file copy to a computer by USB
A SD memory card inserted in the sound level meter will be recognized as a removable disk by the
computer when connected via USB, without having to install a USB driver. To make the connection, use a
generic USB cable (standard A male to mini B male connector). While using this USB connection, the
Communication Interface of the unit can be set to OFF from the [I/O] screen.
9-2. Data recovery
If an unexpected power failure occurs, the data may be damaged. In such a case, turn the unit on without
removing the SD memory card since the unit is equipped with a data recovery function. However, please
note that the recovery of all data is not guaranteed. Formatting on a computer cannot recover the data.
Example:
In the case of Lp 100 ms, the data of approximately up to the last 100 minutes can be recovered.
In the case of Leq 10 s, the data of approximately up to the last one hour can be recovered.
Note: The data may not be recovered depending on the settings.
9-3. Screen hard copy
When you press the
key of the
keys while holding down the DISPLAY key, the
“Screenshot was saved to the card” message is displayed and the current screen contents will be saved as a
bitmap file on the SD memory card.
Store target folder:
File name:
Time at which the file was stored
File name extension:
.BMP
Data capacity:
Approximately 300kByte per file
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9-4. Key lock
Pressing the
and
keys together activates the key lock. A lock symbol appears in the bottom left
corner of the display, and the operation keys except for the LIGHT key are disabled.
If a key other than the LIGHT key is pressed, a key lock indication appears.
Pressing the
and
keys together once more cancels the key lock.
9-5. ECO setting (Power-saving mode)
The Eco setting enables a power saving mode. A long-time measurement can be performed using batteries
only.
The operation procedure is as follows:
① Press the MENU/ENTER key to bring up the menu list screen. Select [System (Language)] and
[Eco Setting] in the menu list screen.
② In the confirmation screen, select [YES] to execute the eco setting. When the eco setting is executed,
the settings of the following items are changed automatically as follows:
Sub channel setting:
OFF
Backlight auto off:
30 s
Backlight brightness:
1
Setting the additional processing: OFF
AC OUT:
OFF
DC OUT:
OFF
Communication interface:
OFF
LCD auto off at Auto store:
1 min (only when optional NA-42EX is installed)
Comparator:
OFF (only when optional NA-42EX is installed)
③ Press the START/STOP key to return the measurement screen.
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10. Menu lists
10-1. NL-42/NL-52 menu list items
10-2. NX-42WR menu list items
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