Rion NA-28 Instruction Manual
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Rion NA-28 Instruction Manual

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INSTRUCTION MANUAL

SOUND LEVEL METER

NA-28
3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan
http://www.rion.co.jp/english/

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  • Page 1: Sound Level Meter

    INSTRUCTION MANUAL SOUND LEVEL METER NA-28 3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan http://www.rion.co.jp/english/...

  • Page 3: Organization Of The Na-28 Documentation

    Organization of the NA-28 Documentation Documentation for the Sound Level Meter NA-28 comes in three parts, as listed below. Instruction Manual (this document) Describes operating procedures for the Sound Level Meter NA-28, connec- tion and use of peripheral equipment such as a level recorder and printer, and use of the memory card.

  • Page 5: Organization Of This Manual

    Organization of This Manual This manual describes the features, operation and other aspects of the Sound Level Meter NA-28 (with 1/3 octave analysis function). If the unit is used together with other equipment to confi gure a measurement system, consult the documentation of all other components as well.

  • Page 6: Default Settings

    Memory Card Explains how to use a memory card with the unit. Input/Output Connectors Explains the input and output connectors of the unit. Default Settings Lists the factory default settings of the unit. Setup File Explains how to start up the unit using settings saved in a setup fi le. Optional Accessories Explains how to use the optional microphone extension cable, printer, and level recorder with the unit.
  • Page 7 FOR SAFETY In this manual, important safety instructions are specially marked as shown below. To prevent the risk of death or injury to persons and severe damage to the unit or peripheral equipment, make sure that all instructions are fully understood and observed.
  • Page 9 Quantifi er notation (Sound level and sound pressure level are expressed uniformly as sound pres- sure level, distinguished by the use of frequency weighting.) The time weighting characteristics Measurement value F, S, 10 ms A-weighted sound pressure level A10ms Sound pressure C-weighted sound pressure level C10ms level...
  • Page 10 viii...
  • Page 11 Quantifi er Notation of Sound Level Meter NA-28 According to International Standards and JIS (Excerpts from ISO 1996, 3891, IEC 61672-1, JIS Z 8202, 8731) NA-28 Frequency Description notation notation notation notation weighting — Sound level — A-weighted sound level —...
  • Page 13 Precautions Operate the unit only as described in this manual. The NA-28 is a precision instrument. Protect it from shocks and vibrations. Take special care not to touch the microphone diaphragm. The diaphragm is a very thin metal fi lm which can easily be damaged.
  • Page 14 To ensure continued accuracy, have the unit checked and serviced at regular intervals. Contact the supplier. Dispose of the unit and of batteries only according to national and local regulations at the place of use. This product can be used in any areas including residential areas. To conform to the EU requirement of the Directive on Waste Electrical and Electronic Equipment, the symbol mark on the right is shown on the instrument.

  • Page 15: Table Of Contents

    Contents Organization of the NA-28 Documentation ........i Organization of This Manual ............iii Outline ....................1 Controls and Functions ..............3 Front View .................3 Operation key panel .............4 Bottom View ................7 Rear View ..................8 Preparations ..................9 Power ..................9 AC adapter ................. 11 Backup Battery ..............
  • Page 16 Power On/Off ................38 To turn the unit on ..............38 To turn the unit off ..............39 Power-on mode ................39 Reading the Display ..............40 Sound level meter display ............40 Analysis screen ................45 T-L (Time/Level) display screen ..........45 Numeric display screen ............46 Indicator messages ..............47 Menu List Screen ..............48 System ................48 Display ................
  • Page 17 Store Operation ................86 Inserting and Removing the CF Card ........88 Manual ..................89 Auto1 ..................95 Auto2 ..................101 Screen Hard Copy ..............104 Memory Card ................105 Using a memory card ............. 105 Data Size Information ............106 About memory cards .............. 108 About the store data format ...........

  • Page 19: Outline

    Outline The Sound Level Meter NA-28 allows octave and 1/3 octave band analysis in real time. It conforms to legal requirements for quantity measurements and to JIS and IEC standards. It supports diffuse sound fi eld measurements and also meets standard requirements when the supplied windscreen is mounted.
  • Page 20 Outline The Sound Level Meter NA-28 allows the following quantity measure- ments. Main processing (sound level meter mode, analyzer mode) Simultaneous measurement of all items with selected time weighting and frequency weighting characteristics Sound level Equivalent continuous sound level Sound exposure level...

  • Page 21: Controls And Functions

    Controls and Functions Front View Microphone/ Preamplifier SOUND LEVEL METER 1/3 OCTAVE BAND ANALYZER NA-28 Display START/STOP STORE PAUSE/CONT MODE MENU LEVEL Operation key panel POWER LIGHT FREQ WEIGHT TIME Infrared remote control sensor Memory card slot cover Microphone/Preamplifi er The microphone/preamplifi er unit can be detached from the main unit and connected via an optional extension cable.

  • Page 22: Operation Key Panel

    Controls and Functions Operation key panel START/STOP key STORE key MODE key START/STOP STORE PAUSE/CONT PAUSE/CONT key Key lock MODE Indicator LED GRP/NUM key MENU MENU key LEVEL keys LEVEL SLM/RTA key / / keys CAL key ENT key POWER LIGHT LIGHT key FREQ WEIGHT TIME...
  • Page 23 Controls and Functions LEVEL keys (Level range switching keys) Serve for selecting the level range for measurement. In sound level meter mode, the following six settings are available. 20 to 80, 20 to 90, 20 to 100, 20 to 110, 20 to 120, 30 to 130 dB In analyzer mode, the following six settings are available.
  • Page 24 Controls and Functions LIGHT key This key turns on the display backlight, for easier reading in a dark loca- tion. Press the key again to turn the backlight off. When the automatic light out function was selected from the menu, the backlight will turn itself off automatically after the preset time.

  • Page 25: Bottom View

    Controls and Functions Bottom View Cover removed Cover Bottom External power supply jack USB port TRIG IN/COMP OUT jack AC OUTPUT jack DC OUTPUT jack Cover This cover protects the connectors on the bottom during transport or stor- age. Removing the cover gives access to the connectors shown above. External power supply jack The supplied AC adapter NC-94B can be connected here for powering the unit from an AC outlet.

  • Page 26: Rear View

    Controls and Functions Rear View Name plate Tripod mounting thread Battery compartment Name plate Shows various information including model number of the unit, microphone number, preamplifi er number, serial number, and date of manufacture. Tripod mounting thread The unit can be mounted on a camera tripod using this thread. Battery compartment Four batteries (IEC R14, size C) are inserted here.

  • Page 27: Preparations

    Preparations Power The NA-28 can be powered by four IEC R14, size C batteries (alkaline or manganese), the supplied AC adapter NC-94B. Rechargeable batteries may also be used, but the NA-28 does not have a facility for charging the batteries.
  • Page 28 Preparations Important Take care not to reverse the (+) and (-) polarity when inserting the batteries. Always replace all four batteries together. To prevent the risk of damage, do not mix old and new batteries or batteries of different type. To prevent the risk of battery fl uid leakage, re- move the batteries from the unit when the unit is not used.

  • Page 29: Ac Adapter

    To AC outlet, 100 to 240 V AC, 50/60 Hz Backup Battery The NA-28 uses a backup battery (rechargeable battery) to retain internal settings and memory data and to operate the clock. While power to the unit is on, the backup battery will be charged.

  • Page 30: Windscreen (Ws-10)

    Preparations Windscreen (WS-10) When making outdoor measurements in windy weather or when measuring air conditioning equipment or similar, wind noise at the microphone can cause measurement errors. Such effects can be reduced by using the wind- screen WS-10. When using the windscreen, set the windscreen correction to ON, as de- scribed below.

  • Page 31: Diffuse Field Correction

    Preparations Diffuse Field Correction When using the unit as an ANSI compliant device, set the diffuse fi eld cor- rection to ON. This compensation feature is designed to ensure fl at frequency response in a diffuse sound fi eld. 1. Select [Measurement] from the menu list and press the ENT key. 2.

  • Page 32: Memory Cards (Cf Card) And Program Cards

    Measurement data can be stored on a memory card for use and further pro- cessing in a computer. Optional program cards can also be used for loading software into the NA-28 to expand the measurement functions of the unit. Inserting a card...

  • Page 33: Microphone Extension Cables (Ec-04 Series)

    Preparations Microphone Extension Cables (EC-04 series) Be sure to turn power to the unit OFF before separating the microphone from the main unit. To reduce measurement deviations due to refraction effects and the acoustic infl uence of the operator, the microphone can be detached from the unit and connected via an extension cable.
  • Page 34 Preparations 2. Connect the extension cable to the preamplifi er and to the main unit and fasten the connectors with the fastening screw. 3. When mounting the microphone on a tripod, fi rst fasten the micro- phone holder (supplied with the extension cable) to the tripod. Then insert the extension cable connector into the microphone holder.

  • Page 35: Connection To A Printer

    Preparations Connection to a Printer (BL-112UI) (BL-112UI was discontinued in 2010.) The USB port on the bottom of the unit can be used for connection to a USB printer, using the optional printer connection cable CC-97. DC 5-6V USB port TRIG IN/ COMP OUT OUTPUT...

  • Page 36: Connection To A Computer

    USB driver for USB com- munication will appear when the unit is connected to a computer. For detail using the communication function, refer to the serial interface manual for NA-28. DC 5-6V USB port...

  • Page 37: Setting The Date And Time

    Preparations Setting the Date and Time The NA-28 incorporates a clock which allows recording the date and time along with measurement data. Set the date and time as described below. 1. Press the POWER key to turn the unit on.
  • Page 38 Preparations keys to select [Time setting] and press ENT key System menu screen keys to select item to set keys or ENT key to select digit keys to change value keys Press or ENT key to move to next digit Press ENT key to accept Press START/STOP key to return to the measurement screen...

  • Page 39: Measurement In A Dark Location

    Preparations Measurement in a dark location Pressing the LIGHT key will turn on the display backlight, for easier read- ing in a dark location. The backlight operation pattern can be controlled via a menu, as follows. 1. Press the MENU key to bring up the menu list screen. 2.

  • Page 40: Sub Channel Settings

    Preparations Sub Channel Settings To use the sub channel, you must make certain settings on a menu screen. 1. Press the MENU key to bring up the menu list screen. 2. Use the keys to select [Measurement] and press the ENT key.

  • Page 41: Trigger Mode Settings

    Preparations Trigger Mode Settings The NA-28 offers a trigger mode whereby measurement is initiated by one of three kinds of trigger: time trigger (time-controlled triggering), level trig- ger (sound level controlled triggering), and external trigger (triggering by an external signal).
  • Page 42 Preparations Time Trigger Setting For Auto1 1. Press the MENU key to bring up the menu list screen. 2. Use the keys to select [Store] and press the ENT key. 3. Use the keys to select [Store Mode] and press the ENT key. 4.
  • Page 43 Preparations For Auto2 1. Press the MENU key to bring up the menu list screen. 2. Use the keys to select [Store] and press the ENT key. 3. Use the keys to select [Store Mode] and press the ENT key. 4.

  • Page 44: Sleep Mode

    Preparations Sleep Mode If time trigger has been selected for the Auto1 or Auto2 mode, you can enable sleep mode (power-saving standby mode). When sleep mode is enabled, the unit will enter a power-saving standby condition before the measurement is started and during intervals between measurements.
  • Page 45 Preparations Select "Time" as trigger mode Set sleep mode to ON Measurement - Trigger Measurement - Trigger menu screen menu screen In the measurement standby condition, the indicator LED fl ashes in blue using the following pattern. 0.1 second intervals 5 seconds Lit Out Lit Lit Out Lit...
  • Page 46 Preparations Level Trigger Setting 1. Press the MENU key to bring up the menu list screen. 2. Use the keys to select [Measurement] and press the ENT key. 3. Use the keys to select [Trigger Mode] and press the ENT key. 4.
  • Page 47 Preparations External Trigger Setting 1. Press the MENU key to bring up the menu list screen. 2. Use the keys to select [Measurement] and press the ENT key. 3. Use the keys to select [Trigger Mode] and press the ENT key. 4.

  • Page 48: Comparator Output

    Preparations Comparator Output This is an open collector output that can be used to control external equip- ment. 1. Press the MENU key to bring up the menu list screen. 2. Use the keys to select [I/O(Input/Output)] and press the ENT key.
  • Page 49 Preparations Comparator band Use the keys to select [Comparator Band] and press the ENT key. The following menu appears. Use the keys to set the band, and press the ENT key. When the keys are kept pressing, the band values are fast-forwarded. I/O - Comparator menu screen...
  • Page 50 Preparations About the comparator output When the sub channel is OFF, the comparator will not function if sub chan- nel is selected as comparator band. Similarly, if analyzer mode is set for simultaneous analysis of octave and 1/3 octave bands, and 16 kHz or 20 kHz is selected as comparator band, the comparator will not function.

  • Page 51: Language Selection

    Preparations Language Selection The language used for displaying messages and menus can be selected as follows. 1. Press the MENU key to bring up the menu list screen. 2. Use the keys to select [System (Language)] and press the ENT key. 3.

  • Page 52: Calibration

    Calibration Before starting a measurement, the NA-28 must be calibrated. There are two types of calibration, namely electrical calibration using an internally gener- ated signal and acoustic calibration using an external sound calibrator. Electrical calibration Calibration is carried out using a signal generator (1 kHz, sinusoidal wave) built into the unit.
  • Page 53 -6 dB. A calibration signal is supplied at the AC OUTPUT and DC OUTPUT jack on the bottom panel of the NA-28. 3. Press the CAL key once more to return to the measurement screen. Note...

  • Page 54: Acoustic Calibration With Sound Calibrator Nc-74

    1. Turn off the Sound Calibrator NC-74. 2. Turn on the NA-28. 3. At the measurement screen, use the FREQ WEIGHT key to set fre- quency weighting for the main channel to '' A ''.
  • Page 55 STORE key. The indication will change to '' A coustic Calibration''. 9. Use the keys to adjust the reading of the NA-28 to the value shown below. Sound Calibrator NC-74: 94.0 dB 10. Press the CAL key. The measurement screen returns.

  • Page 56: Power On/Off

    Power On/Off To turn the unit on Hold down the POWER key until the power-on screen (mosaic pattern Rion logo mark) appears (at least 1 second). When the screen is shown, release the POWER key. After the unit has been started, the measurement screen appears.

  • Page 57: To Turn The Unit Off

    '' A -B''. Normally the '' A '' position is used. Setting this switch to the ''B'' position allows the NA-28 to be turned on simply by supplying power to the external power supply jack. In this case, the POWER key on the operation panel of the NA-28 has no effect.

  • Page 58: Reading The Display

    Reading the Display Sound level meter display The illustration below shows all elements of the display for explanation pur- poses. In actual operation, such a screen will not be shown, and the size and font of the actual display may be slightly different. Diffuse sound correction Comparator ON/Comparator level Trigger mode...
  • Page 59 Reading the Display Store mode Shows the selected mode for storing data in memory (Manual, Auto1, or Auto2). Level range Shows the upper and lower limit of the bar graph. Can be switched with the LEVEL keys. Bar graph Shows the sound level as a bar graph indication. (The display is updated every 100 msec.) Overload indication When a signal overload condition is detected, the indication...
  • Page 60 Reading the Display Main channel level display Shows the measured sound level in the main channel. (The display is updated every second.) Sub channel level display Shows the measured sound level in the sub channel. (The display is up- dated every second.) Current date and time Shows the current date and time.
  • Page 61 Reading the Display Sub channel time weighting Indicates the sub channel time weighting characteristic. F: Fast, S: Slow, : 10 ms, I: Impulse The sub channel time weighting characteristic is set from a menu. Sub channel frequency weighting Indicates the sub channel frequency weighting characteristic. A: A-weighting, C: C-weighting, Z: Z-weighting (Flat response) The sub channel frequency weighting characteristic is set from a menu.

  • Page 62: Trigger Mode

    Reading the Display Mode of analysis Indicates the condition of the display screen. SLM: Sound level meter display OCT.: Octave band analysis screen 1/3OCT.: 1/3 octave band analysis screen OCT&1/3OCT: Simultaneous octave and 1/3 octave band analysis screen Windscreen correction WS OFF symbol is shown when windscreen correction is OFF.

  • Page 63: Analysis Screen

    Reading the Display Analysis screen An example for the OCT & 1/3 OCT analysis screen is shown below. Use the keys of the keys to move the cursor to the target frequency. Comparator indication Comparator band Cursor Main channel AP level Move cursor with keys Sub channel AP level...

  • Page 64: Numeric Display Screen

    Reading the Display Numeric display screen Examples for OCT., 1/3 OCT., and OCT & 1/3 OCT analysis screens are shown below. Numeric display (1/3 OCT) screen Numeric display (OCT) screen Frequencies that are currently not displayed keys. can be called up with the Numeric display (OCT, 1/3 OCT) screen...

  • Page 65: Indicator Messages

    Reading the Display Indicator messages When keys such as START/STOP or STORE are pressed, indicator messages such as shown below will appear on the display for about 1 second. When START/STOP key was pressed and processing has started When START/STOP key was pressed and processing has ended When STORE key was pressed (store address is also shown)

  • Page 66: Menu List Screen

    Reading the Display Menu List Screen Pressing the MENU key brings up the menu list screen as shown below. Use keys to select the desired menu and press the ENT key. Menu list screen System Use the keys to select [System] and press the ENT key. The sys- tem menu comes up.
  • Page 67 Reading the Display Read/Save Setting Bring the cursor to [Read/Save Setting] and press the ENT key. The [System - Setting] screen appears. Return MENU keys to select the item and press the ENT key. The [System - Settings - Save] screen appears. keys to select the item and press the ENT key.
  • Page 68 Reading the Display Time setting Bring the cursor to [Time Setting] and press the ENT key. The [System - Time Setting] screen appears. Use ENT key to select digit and keys to change value Long push of makes values change faster Press ENT key to accept setting [System - Time Setting] screen Program Information...

  • Page 69: Display

    Reading the Display Display Use the keys to select [Display] and press the ENT key. The display menu screen appears. MAX Hold ON/OFF (can be selected in analyzer mode) ON/OFF ON/OFF Lmax ON/OFF Lmin ON/OFF LN1 (L01 to L99) ON/OFF LN2 (L01 to L99) ON/OFF LN3 (L01 to L99)

  • Page 70: I/O (Input/Output)

    Reading the Display I/O (Input/Output) Use the keys to select [I/O (Input/Output)] and press the ENT key. The Input/Output menu screen appears. AC Out OFF/MAIN/SUB DC Out OFF/MAIN/SUB Comparator ON/OFF USB Communication ON/OFF Remote Control ON/OFF Backlight Brightness Dark/Bright Backlight Auto-Off 30 s/3 m/Cont Beep ON/OFF Index...
  • Page 71 Reading the Display Comparator next menu level Use the keys to move the cursor to [Comparator] and press the ENT key. The following next menu level appears. Comparator ON/OFF Comparator Level 25 to 130 dB (1-dB steps) Comparator Band SUB AP/MAIN AP/12.5 Hz/16 Hz/20 Hz/25 Hz ...

  • Page 72: Store

    Reading the Display Store Use the keys to select [Store] and press the ENT key. The store menu appears. Store Mode Manual/Auto1/Auto2 Store Name MAN_ **** AU1_ **** AU2_ **** **** is a 4-digit number from 0000 to 9999 Store name is settable when CF card is inserted. Sampling Period (SLM/RTA) (only shown in Auto1 mode) SLM: 100 ms (fi xed)

  • Page 73: Measurement

    Reading the Display Measurement Use the keys to select [Measurement] and press the ENT key. The measurement menu appears. Wind Screen Correction ON/OFF Measurement Time Auto1: 1 s to 1000 h Auto2 or normal measurement: 1 s to 24 h Back-Erase OFF/5 s Delay Time...
  • Page 74 Reading the Display Trigger mode next menu level Use the keys to select [Trigger Mode] and press the ENT key. The following next menu level appears. Available trigger mode settings are Level 1, Level 2, Time, and EXT. It is available to set the trigger interval when the store mode is...
  • Page 75 Reading the Display Sub channel next menu level Use the keys to select [Sub Channel] and press the ENT key. The following next menu level appears. Measurement-SUB Channel Measurement-SUB Channel menu screen...

  • Page 76: Print

    Reading the Display Print Use the keys to select [Print] and press the ENT key. The print menu screen appears. Printing screen At the recall screen, it is possible to select a range for simultaneous printing of data for multiple addresses. However, the print format will depend on the screen that is shown at the time of printing, as listed in the table below.

  • Page 77: Recall

    Reading the Display Recall Use the keys to select [Recall] and press the ENT key. The Select File menu appears. Select File menu screen...
  • Page 78 Reading the Display Menu List Items System CF Card Format Read/Save Settings [v]---------- Load Default Group Save for CF card [v]---------------- List of setting groups on CF card Group Loading/Delete for CF card [v]---- List of setting groups on CF card Time Setting ----------------Year/Month/Day Hour:Min:Sec Program Information [v]----------------- Model, Version...

  • Page 79: Measurement

    Measurement When using the NA-28 in a mode other than "sound level measurement", all processing functions provided by the unit (L ) are car- ried out simultaneously. (However, for the sub channel, only the additional processing function set to "ON" in the menu screen is carried out.) For ex- ample, when equivalent continuous sound level measurement is selected, the sound exposure level and percentile level are also determined.
  • Page 80 Measurement 2. Use the FREQ WEIGHT key to select the frequency weighting characteristic. For normal sound level measurements, select the "A" setting. When L (Flat) is selected for display, the sound pressure level from 10 Hz to 20 kHz is measured with fl at characteristics. When L is selected for display, the sound pressure level from 31.5 Hz to 8 kHz is measured with fl at characteristics.
  • Page 81 Measurement Analyzer mode Measurement time setting Back-erase ON Elapsed time Bar graph Measurement in progress symbol UNDER OVER OVER Overload indication Main channel UNDER Frequency weighting Under-range indication Time weighting Sub channel Frequency weighting Time weighting Important During sound level measurement, do not press the MODE key.

  • Page 82: Equivalent Continuous Sound Level

    Normally, select the "F" (Fast) setting. (This setting does not affect a measurement result of equivalent continuous sound level.) Note The NA-28 performs high-speed sampling of the sound pressure waveform (15.6 µs; 20.8 µs when octave and 1/3 octave analysis is performed simultaneously)
  • Page 83 Measurement MODE key START/STOP STORE PAUSE/CONT START/STOP key MODE Indicator LED MENU MENU key LEVEL LEVEL keys keys ENT key POWER LIGHT FREQ WEIGHT TIME POWER key FREQ WEIGHT/ TIME WEIGHT keys 6. Set the measurement time from the menu. Press the MENU key to bring up the menu list screen.
  • Page 84 Measurement Measurement start START/STOP key pressed Preset time delay time Time Time graph for delay time START/STOP key pressed Measurement start Trigger event Preset Trigger standby time delay time Time Time graph for use of trigger function 10. Press the MENU key to return to the menu list screen and use the keys to select [Display].
  • Page 85 Measurement 14. Press the START/STOP key to start the measurement. At this point, previous measurement values are cleared. While the measurement is in progress, the symbol fl ashes and the elapsed time is displayed. When the measurement time set in step 9 has elapsed, the measurement is terminated automatically.
  • Page 86 Measurement If the back-erase function was enabled in steps 7 and 8, using the Time-Level screen is convenient. Data excluded by the back-erase function are indicated on the display as follows. Data excluded by back-erase function (ON, 5 s) Time-Level screen 15.

  • Page 87: Sound Exposure Level (L ) Measurement

    Measurement Sound Exposure Level (L ) Measurement The procedure for sound exposure level measurement is similar to that for equiva- lent continuous sound level measurement, but the menu item selection differs. Preparations as described in the "Preparations" chapter must be completed fi rst. 1.
  • Page 88 Measurement During measurement, the PAUSE/CONT key can be used to pause and resume the measurement. During pause, the pause symbol ( ) is shown. (The paused interval and the back-erase interval are not included in the measurement time.) Important During measurement, the LEVEL keys, FREQ WEIGHT key, and TIME WEIGHT key function as markers.

  • Page 89: Maximum Sound Level (L Max )

    Measurement Maximum Sound Level (L ) and Minimum Sound Level ) Measurement The procedure for maximum sound level and minimum sound level measure- ment is similar to that for equivalent continuous sound level measurement, but the menu item selection differs. Preparations as described in the "Preparations"...
  • Page 90 Measurement 9. Press the START/STOP key to start the measurement. While the measurement is in progress, the symbol fl ashes and the elapsed time is displayed. When the preset measurement time has elapsed, the measurement is terminated automatically. To terminate the measurement before the allocated time, press the START/STOP key.
  • Page 91 Measurement Note During measurement, you can use the MODE key to check the equivalent continuous sound level as cur- rently calculated. (This applies only to the numeric level display. The bar graph shows the sound level.) After the measurement is completed, changing the frequency weighting (A/C/Z), time weighting (Fast/Slow) or other settings hides the measurement value.

  • Page 92: Max /L Min Type

    Measurement Selecting the L type BAND (Band maximum/band minimum): The analysis result applies to the point where the level for each frequency band was maximum or minimum within the sampling period. AP (All-pass maximum/all-pass minimum): The analysis result applies to the sub channel all-pass and band-pass level values taken at the point where the all-pass level in the main channel was maximum/minimum within the sampling period.

  • Page 93: Percentile Sound Level

    Measurement Percentile Sound Level (L ) Measurement The procedure for percentile sound level measurement is similar to that for equiva- lent continuous sound level measurement, but the menu item selection differs. Preparations as described in the "Preparations" chapter must be completed fi rst. 1.
  • Page 94 Measurement 6. Press the START/STOP key to start the measurement. While the measurement is in progress, the symbol fl ashes and the elapsed time is displayed. When the preset measurement time has elapsed, the measurement is terminated automatically. To terminate the measurement before the allocated time, press the START/STOP key.
  • Page 95 Measurement Note During measurement, you can use the MODE key to check the equivalent continuous sound level as currently calculated. (This applies only to the nu- meric level display. The bar graph shows the sound level.) After the measurement is completed, changing the frequency weighting (A/C/Z), time weighting (F/ S) or other settings hides the measurement value.

  • Page 96: Additional Processing Value

    Additional Processing Value (L ) Measurement peak Atm5 When the NA-28 is in sound level meter mode and the sub channel is ON, one of the following processing functions is available in addition to L , and L Peak sound level...
  • Page 97 Measurement 6. Use the keys to select [Sub Channel] and press the ENT key. 7. Use the keys to select [L ] and press the ENT key or key. peak keys to select L or L Use the and press the ENT key. peak 8.

  • Page 98: Back-Erase Function

    Measurement Important is the time-weighted sound level. Processing for this value begins when the START/STOP key is pressed, and the display is updated ac- cordingly. The display will not be updated when processing has stopped. Therefore using the MANUAL mode is recommended for L Note During measurement, you can use the MODE key to check the equivalent continuous sound level as...
  • Page 99 Measurement 1. Press the MENU key to bring up the menu list screen. 2. Use the keys to select [Measurement] and press the ENT key. The measurement menu screen appears. 3. Use the keys to select [Back Erase] and press the ENT key. The indication "5 s/OFF"...

  • Page 100: Marker

    Measurement Marker During processing of L and other values, it is possible to add markers to the data. 1. Select the store mode on the menu list screen. Also set the required measurement parameters such as frequency weighting and time weighting. 2.

  • Page 101: Max Hold

    Measurement Max Hold This function retains the maximum value for one second, for easier reading of the changing bar graph indication. Max hold level is shown only on the analysis screen. 1. Press the MENU key to bring up the menu list screen. 2.

  • Page 102: Delayed Measurement

    Measurement Delayed Measurement The NA-28 allows setting a delay time to be inserted before the actual start of the measurement. 1. Press the MENU key to bring up the menu list screen. 2. Select [Measurement] and press the ENT key to bring up the mea- surement menu screen.
  • Page 103 Time When a delay time has been set, the NA-28 will operate as follows. When the START/STOP key is pressed, the measurement standby symbol starts to fl ash. When the delay time has elapsed, the symbol changes to a fl ashing and the measurement starts.

  • Page 104: Store Operation

    There are three different ways of storing data, as listed below. If no CF card is inserted, the data will be stored in the internal memory of the NA-28. If a CF card is inserted, the data will automatically be stored on the card.
  • Page 105 Store Operation Analyzer mode Continuous store of sound level L values for each band and all-pass Main channel: All-pass value and band level values Sub channel: All-pass value 1 ms to 1 sec, L Sampling cycle: eq,1s Internal memory: max. 10000 data (2.7 hours for 1 sec or eq,1s Auto2 Sound level meter mode...

  • Page 106: Inserting And Removing The Cf Card

    Store Operation Inserting and Removing the CF Card Insert or remove the CF card as shown below. Note Be sure to turn power OFF before inserting or re- moving a card. Engage this section with your nail to open the cover. 1.

  • Page 107: Manual

    Store Operation Manual Memory Store At the point where the STORE key is pressed, the current sound level and processing values are stored. Immediately after turning power on, there will be no processing values, therefore only the sound level is stored when the STORE key is pressed. If no CF card is inserted, data will be stored in internal memory.
  • Page 108 Store Operation 5. Use the keys to select [Manual] and press the ENT key. 6. Specify the store name (When CF card is inserted). 6-1. Use the keys to select [Store Name] and press the ENT key. 6-2. Use the keys to specify the fi rst two digits and press the ENT key.
  • Page 109 Store Operation 9. Specify the store address. The currently selected address is shown on the screen. If the address is shown in red, it already contains data. Take care not to overwrite data that you want to keep. keys can be used to specify the address in the range from 0001 to 1000.
  • Page 110 Store Operation Important Any measurement data present in the currently displayed address will be overwritten. If the address is shown in red, it contains data. Take care not to accidentally overwrite data. Note When address 1000 is reached, it will be overwrit- ten without confi rmation.
  • Page 111 Store Operation MODE key START/STOP key GRP/NUM key MENU key keys ENT key POWER key keys Select store name with and press ENT key Recall screen, sound level meter mode Recall screen, analyzer mode...
  • Page 112 Store Operation Erasing Stored Data To erase data stored in manual mode, proceed as follows. Note Data are erased in store name units. It is not possible to selectively erase data for a specifi c address. 1. Press the MENU key to bring up the menu list screen. 2.

  • Page 113: Auto1

    Memory Store If no CF card is inserted, the data will be stored in the internal memory of the NA-28. If a CF card is inserted, the data will automatically be stored on the card. Storing data on CF card is recommended.
  • Page 114 Store Operation 5. Specify the store name (When CF card is inserted). 5-1. Use the keys to select [Store Name] and press the ENT key. 5-2. Use the keys to specify the fi rst two digits and press the ENT key. 5-3.
  • Page 115 Store Operation 9. Press the STORE key to start the measurement. Important During measurement, only the START/STOP key, PAUSE/CONT key, LIGHT key, STORE key, MODE key and POWER key are operative. Other keys such as the FREQ WEIGHT key and TIME WEIGHT key have no effect.
  • Page 116 Store Operation Recalling Stored Data The procedure for recalling data stored in memory is described below. 1. Turn power to the unit on. 2. Press the MENU key to bring up the menu list screen. 3. Use the keys to select [Recall] and press the ENT key. The fi le selection menu appears.
  • Page 117 Store Operation Recall screen, sound level meter mode Recall screen, analyzer mode...
  • Page 118 Store Operation Erasing Stored Data To erase stored data, proceed as follows. 1. Press the MENU key to bring up the menu list screen. 2. Use the keys to select [Recall] and press the ENT key. 3. The fi le selection screen appears and stored data are displayed. Use keys to select the data that you want to erase.

  • Page 119: Auto2

    Memory Store If no CF card is inserted, the data will be stored in the internal memory of the NA-28. If a CF card is inserted, the data will automatically be stored on the card. Storing data on CF card is recommended.
  • Page 120 Store Operation 5. Specify the store name (When CF card is inserted). 5-1. Use the keys to select [Store Name] and press the ENT key. 5-2. Use the keys to specify the fi rst two digits and press the ENT key. 5-3.
  • Page 121 Store Operation Measurement menu screen Time trigger menu screen Measurement end time Measurement start time (trigger start time) (trigger end time) Measurement Measurement time time Measurement Measurement interval interval Trigger interval Note During Auto2 store, the pause function cannot be used.

  • Page 122: Screen Hard Copy

    Store Operation Screen Hard Copy When you press the LEVEL key while holding down the MENU key, the current screen contents will be saved as a bitmap fi le on the CF card. Store target folder: \SCREENSHOT\ File name: Time at which the fi le was stored File name extension: .BMP...

  • Page 123: Memory Card

    Memory Card Using a memory card Open the cover of the memory card slot and insert a CF card. To remove the card, push the lever so that the card pops out. Important Make sure that power is OFF before inserting or removing a card.

  • Page 124: Data Size Information

    Memory Card Data Size Information When using manual store The approximate number of data sets that can be stored on a 128 MB memory card is as follows. Sizes per one data Number of data (Byte) SLM mode 1330 55000 OCT.
  • Page 125 Memory Card When using Auto2 store The approximate number of data sets for various card capacity ratings are listed below. Sizes per one data Number of data (Byte) Card size 128 M 256 M SLM mode 390 k 800 k 3.2 M 6.2 M OCT.

  • Page 126: About Memory Cards

    Memory Card About memory cards Be sure to use optional memory cards from Rion Co., LTD. The memory cards that can be used in this unit are CompactFlash cards. * CompactFlash is a trademark of San Disk Corporation. Memory cards even from the same manufacturer and of the same type exhibit certain variations in specifi cations which may cause problems.

  • Page 127: About The Store Data Format

    Memory Card About the store data format Data stored on the memory card are in CSV format. Various fi les and subdi- rectories are created on the card, depending on the store mode. Manual store The store name specifi ed on the menu screen is created as a 4-digit number under the subdirectory name.

  • Page 128: Formatting (Initializing) A Cf Card

    Formatting (initializing) a CF card will erase all data present on the card. A CF card can be formatted either in a computer or in the NA-28. The procedure for formatting the card in the NA-28 is described below. 1. Press the MENU key to bring up the menu list screen.

  • Page 129: Input/Output Connectors

    Input/Output Connectors AC OUTPUT 1. Press the MENU key to bring up the menu list screen. 2. Use the keys to select [I/O (Input/Output)] and press the ENT key. 3. Use the keys to select [AC OUT] and press the ENT key.
  • Page 130 The relationship between the display value shown by the NA-28 and the output voltage is indicated below. When the NA-28 is set to the calibration mode, the output signal (level range upper limit 120 dB -6 dB = 114 dB, 1000 Hz sinusoidal wave) is 0.5 Vrms.

  • Page 131: Dc Output

    -110 -100 Scale (dB) FS: Full-scale value When the NA-28 is set to the calibration mode, the output signal (level range 120 dB, scale upper limit -6 dB) is 2.85 V. Note Using this feature will reduce battery life by about...

  • Page 132: Trig In/Comp Out Jack

    A connection diagram for the TRIG IN/COMP OUT jack is shown below. The optional splitter adapter CC-59 is required for using the TRIG IN/COMP OUT jack. 2.5 dia. mono jack Bottom of NA-28 TRIG IN/COMP OUT jack MAIN 2.5 dia. stereo plug...
  • Page 133 Input/Output Connectors TRIG IN (Trigger input) 0 to 5 V logic-level signal, falling edge trigger, pulse width 1 ms or more Logic level Pulse width > 1 ms COMP OUT (Comparator output) approx. Comparator output Open-collector Maximum applied voltage: 24 V DC Maximum drive current: 50 mA DC Signal output continues for 1 second after level falls below threshold...

  • Page 134: Default Settings

    Default Settings The factory default settings of the unit are listed below. SLM/RTA ............SLM Mode ............... L Main channel frequency weighting ....A Main channel time weighting ......F Level range full scale ........120 Calibration mode ..........Internal Measurement time ...........
  • Page 135 Default Settings (L05) ......... OFF (L10) ......... OFF (L50) ......... ON (L90) ......... OFF (L95) ......... OFF List ..............ON T-L (Time/Level) display ......... ON ) ..L Additional processing value (L peak peak Store mode ............Manual Store name ............MAN_0000 RTA mode Auto1 sampling cycle .....

  • Page 136: Setup File

    Do not create the setup fi le more than one in this folder. When the NA-28 is turned on with a CF card inserted, and if that CF card contains a setup fi le, a dialog asking whether to load the settings appears.

  • Page 137: Preparing A Setup Fi Le For Automatic Loading

    Remove the CF card from the NA-28 and connect it directly to the computer, using a CF card reader or similar. (2) Leave the CF card in the NA-28 and connect the NA-28 via USB cable to the computer. 3. Check whether a folder named "NA-28\SETUP\SET_ "...

  • Page 138: Automatic Loading Of Settings At Startup

    Automatic loading of settings at startup 1. Insert a CF card prepared as described in the preceding section "Preparing a setup fi le for automatic loading" into the NA-28, and turn power on. 2. A dialog appears asking whether to load the settings. Select "Yes"...

  • Page 139: Saving A Setup Fi Le

    Setup File Saving a setup fi le 1. Set the NA-28 to the intended condition, so that measurement pa- rameters and other settings are as desired. 2. On the menu screen, select [System], then select [Read/Save Setting] and press the ENT key.

  • Page 140: Copying A Setup Fi Le To Cf Card

    CF card can be used. The NA-28 does not allow directly saving settings in a fi le on the CF card. The settings must fi rst be saved in internal memory as described in the pre- ceding section, and then the fi le(s) must be copied to the CF card.

  • Page 141: Optional Accessories

    Optional Accessories Microphone Extension Cables (EC-04 series) For enhanced measurement accuracy, the microphone can be detached from the unit and connected via an extension cable. This will reduce measurement deviations due to refraction effects of the unit or the acoustic infl uence of the operator.

  • Page 142: Printer

    Printer BL-112UI (BL-112UI was discontinued in 2010.) Data stored in the memory of the NA-28 and on CF card can be printed out on a printer. You can also produce hard copy of measurement screens. (The printer, printer paper, and printer cable are options.) To print measurement data, turn the NA-28 and the printer on and set the printer to the online state.
  • Page 143 Optional Accessories Printing stored data The steps for printing hard copy of a stored data screen are described be- low. 1. On the menu list screen, select [Recall] and press the ENT key. 2. Use the keys to select the stored data that you want to print.
  • Page 144 Optional Accessories 4. When you press the ENT key once more, the recall menu list screen appears. Select [Print] and press the ENT key. 5. A display such as shown below appears. If you want to print only a range of data, select "Data Range Print" and specify the range. Then select "Execute"...

  • Page 145: Level Recorder Lr-07/Lr-20A

    Sound level recording The procedure for recording sound level changes over time is described below. Turn power to the NA-28 and the level recorder on. The steps described in the chapter "Preparations" (page 9) should be completed. For details about level recorder operation, refer to the documentation supplied with the level recorder.
  • Page 146 When recording range is 50 dB -6 dB position Sound level meter scale upper limit 7. Press the CAL key once more to return the NA-28 to the measure- ment mode. 8. Use the FREQ WEIGHT key to set the frequency weighting character- istic.

  • Page 147: Program Cards

    Optional Accessories Program Cards The NA-28 can make use of a range of optional program cards. For details on usage, refer to the documentation supplied with the respective card.

  • Page 148: Remote Control

    Optional Accessories Remote control The infrared remote control (NA-27RC1) can be used to control the basic functions and measurement parameters of the sound level meter. This is achieved by pressing buttons arranged on the panel of the remote control. The operation range of the remote control is about 3 meters. START/STOP key Serves for starting and stopping the mea- surement.
  • Page 149 Optional Accessories Insert two IEC R03, size AAA batteries (LR03 or R03) into the battery compartment on the rear of the remote control. 1. Pull the cover of the battery compartment down while pushing on the section marked with the symbol.

  • Page 150: Specifi Cations

    Specifi cations Applicable standards General measurement law of Japan: precision sound level meters IEC 61672-1:2013 class 1 IEC 61260:1995 class 1 ANSI S1.11-2004 class 1 ANSI S1.4-2014 class 1 JIS C 1509-1:2005 class 1 JIS C 1513:2002 class 1 JIS C 1514:2002 class 1 JIS C 1516:2014 class 1 IEC 60804:2000 Type 1, IEC 60651:1979 Type 1 were abolished in 2002 and replaced by IEC 61672-1...
  • Page 151 Specifi cations Measurement items Simultaneous measurement of all items, using selected time weighting and frequency weighting Sound level Equivalent continuous sound level L Sound exposure level Maximum sound level Minimum sound level Percentile sound level (1 to 99, 1-incre- ment steps, max. 5 values, calcu- lated from L eq,1sec...
  • Page 152 Specifi cations Microphone and preamplifi er Microphone UC-59 Sensitivity -27 dB ±2 dB (re. 1 V/Pa) Preamplifi er NH-23 Measurement level range A-weighting 25 to 140 dB C-weighting 33 to 140 dB Z-weighting 38 to 140 dB Total range 25 to 140 dB (A-weighting, 1 kHz) Upper limit for peak sound level measurement 143 dB Inherent noise A-weighting max.
  • Page 153 Specifi cations Linear operating range All-pass (A-weighting) 110 dB (30 to 130 dB range, 1 kHz) Spectrum 95 dB Level range Sound level meter mode Bar graph display range max. 100 dB 30 to 130 dB 20 to 120 dB 20 to 110 dB 20 to 100 dB 20 to 90 dB...
  • Page 154 Specifi cations Display Backlit semitransparent color TFT LCD display (240 × 320 dots) Update frequency: 100 ms (200 ms when performing auto store with simultaneous analysis at sampling cycles of less than 100 ms) Trigger function Controls measurement and memory store start Level 1 Trigger level (1-dB steps) serves as threshold for starting measurement;...
  • Page 155 Specifi cations Manual store Data for measurement results and measurement start time are stored manually, in single address increments. Data store capacity Internal memory max. 1000 data sets CF card max. 1000 data sets per store name, max. 100 store names Auto store Measurement results are stored continuously at preset intervals.
  • Page 156 Specifi cations Auto2 Sound level meter mode Continuous store of main channel and sub channel all-pass value and measurement start time, at each measurement interval Analyzer mode Continuous store of main channel band level and all-pass values, sub channel all-pass value, and measurement start time, at each measurement interval Number of data...
  • Page 157 Communication commands cannot be used for transfer of store data or for making store operation settings Remote control sensor Allows operation of NA-28 using infrared remote control (optional) Power requirements Four IEC R14, size C batteries or external DC power supply (5 to 6 V) Battery life (at 23°C, normal operation)
  • Page 158 Specifi cations Ambient conditions -10 to +50°C, 10 to 90% RH Dimensions 331 × 89 × 51 mm Weight Approx. 730 g (with batteries) Supplied accessories CF card 256 MB Storage case Soft case AC adapter NC-94B Windscreen WS-10 Output cable (BNC-mini plug cable) CC-24 Hand strap Size C battery LR14...
  • Page 159 Specifi cations RION SOUND LEVEL METER 1/3 OCTAVE BAND ANALYZER NA-28 START/STOP STORE PAUSE/CONT MODE MENU LEVEL POWER LIGHT FREQ WEIGHT TIME Side View Front View Rear View Bottom View Unit: mm Dimensional Drawings...
  • Page 160 No. 50497 15-08...

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