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Rion DA-21 Instruction Manual

4 channel data recorder
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INSTRUCTION MANUAL
4 channel Data Recorder
DA-21
3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan
http://www.rion.co.jp/english/

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  • Page 1 INSTRUCTION MANUAL 4 channel Data Recorder DA-21 3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan http://www.rion.co.jp/english/...
  • Page 3 This manual describes the features, operation and other aspects of the 4 channel Data Recorder DA-21. 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 4 Messages Explains the meaning of messages that appear on the display and counter- measures to take in response to such messages. Filter Characteristics Shows the high-pass fi lter and low-pass fi lter characteristics. Settings and Other Information For convenient reference, this section lists all menu settings, data recording operation types, and other relevant information.

  • Page 5: For Safety

    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 6 Caution When using earphones, beware of excessive volume levels When connecting earphones to the Monitor Out connector of this unit, use only earphones with a volume adjustment function, because there is a risk of excessive volume levels. Do not play the supplied disc in a CD player The supplied viewer software installation disc is not a music CD.
  • Page 7 Important Check the install CD before installation Before inserting the supplied viewer software install CD in the CD-ROM drive of a computer, be sure to visually check the disc. If there are any cracks or scratches or if the disc is deformed, do not insert the disc in the CD-ROM drive.
  • Page 8 Use only earphones with volume control function at the Monitor Out connector of this unit, and beware of excessive volume levels. Use only SD memory cards supplied by Rion. Other commercially avail- able cards may not operate properly with the unit.
  • Page 9 Verify before use that all cables are correctly and safely connected. Do not bend cables sharply or subject them to pressure. When removing cables, always grasp the plug or connector and do not pull the cable. Do not apply strong shock to the connected cables to the unit. Otherwise the cables may remove from the unit.
  • Page 10 AC adapter precautions Use only the specifi ed AC adapter available as an option for the DA-21 (NC-98C). Use of any other adapter can lead to damage or unexpected accident. Take care not to mix up the AC adapter with the AC adapter of another product.

  • Page 11: Table Of Contents

    Contents FOR SAFETY ................iii Outline ....................1 Controls and Functions ..............5 Front panel .................5 Rear panel ................10 Right side panel ...............12 Bottom panel ................13 Power On/Off ................14 Display Explanation ..............17 Display screen................17 Menu Operations and Setting Items ..........30 General menu operation steps ..........30 Menu Items ................39 <Input>...
  • Page 12 Preventing inadvertent operation (key lock and menu lock) 87 Remote control operation ...........89 Connection to a computer ............90 Inter-unit synchronization ............91 Tachometer signal input ............93 Recording ..................94 Recording steps ...............94 1. Checks before recording ............94 2. Input range setting / Calibration signal recording ....96 3.

  • Page 13: Outline

    The capability for sensor drive power supply (CCLD) is also provided. Unlike with conventional units having only general-purpose connectors, the design of the DA-21 eliminates the need to set up additional connection equipment, allowing quick and uncomplicated recording start.
  • Page 14 (including voice memo and marker), as well as fre- quency weighting and time weighting functions. The software runs on Windows computers. Synchronize two DA-21 units to record signals simultaneously up to 8 channels.
  • Page 15 Vibration level meter Generic waveform processing software (up to 2 channels) Microphone Accelerometer (NOTE) WAVE files created by the DA-21 are not Other sensor supported by the DA-20PA1, DA-40 Viewer or CAT-78WR application software. SD memory card Windows Computer (generic)
  • Page 16 Outline Operation environment The DA-21 allows various operations for recording data. The general concept of the basic functions is as shown in the diagram below. Power ON Recording procedure (record data) [REC] Recording end [MENU] or [STOP] Menu screen Main screen...

  • Page 17: Controls And Functions

    (10) CLEAR Ov key OVERLOAD indicator (11) RECALL key Card slot cover (13) MENU key OVERLOAD CARD CAPACITY LIGHT CLEAR Ov RECALL RANGE MENU DA-21 4ch DATA RECORDER STOP PLAY PAUSE POWER PLAY PAUSE (1) POWER key indicator indicator indicator (7) ENT key...
  • Page 18 Shows input data, recorded data, menus for changing settings, etc. Key names and functions The DA-21 has some dedicated keys that perform only a specifi c function, and some keys that perform various functions depending on the current operating state.
  • Page 19 Controls and Functions (9) [LIGHT] key Serves to control backlighting of the LCD screen. The backlight is turned on or off depending on the key press timing. When the LCD backlight has been activated, it will automatically turn itself off if there has been no key activity for a certain period.
  • Page 20 Indicator names and functions (5) CARD CAPACITY indicator (1) OVERLOAD indicator OVERLOAD CARD CAPACITY LIGHT CLEAR Ov RECALL RANGE MENU DA-21 4ch DATA RECORDER STOP PLAY PAUSE POWER (4) PAUSE indicator (3) REC indicator (2) PLAY indicator (1) OVERLOAD indicator Indicates that the input signal level in a channel is excessive.
  • Page 21 Controls and Functions (4) PAUSE indicator Indicates that data playback is being paused. Flashing in blue: Data playback is being paused. (5) CARD CAPACITY indicator Indicates that the remaining data recording time on the SD memory card is less than 10 minutes. Flashing in red: Data recording will stop within 10 minutes.

  • Page 22: Rear Panel

    When connecting an external DC source to the DC IN connector, pay close attention to voltage rating and polarity. The allowable voltage range is 5 V to 20 V. (2) Unit to Unit connector Use this connector to synchronize two DA-21 units.
  • Page 23 Controls and Functions (3) Remote Controller connector Serves to connect the optional remote controller. (4) Rotary pulse input connector A rotary pulse signal (Tacho signal) of a fan, a motor etc. can be input here. (5) Input connectors These connectors are used to supply the input signal for recording. (6) Output connectors While recorded data are being played back in recall mode, the playback signal is available at these connectors.

  • Page 24: Right Side Panel

    DA-21. This unit supports SD memory cards and SDHC memory cards, but not SDXC memory cards. When an SD memory card with a large number of fi les is inserted in the DA-21, the unit may take some time to recognize the card.

  • Page 25: Bottom Panel

    When the [WAKE UP ON POWER] switch inside the battery com- partment is set to “ON”, the unit is switched on and off in conjunction with the power supplied to the DC IN connector on the DA-21. In this case, the [POWER] key has no effect.

  • Page 26: Power On/Off

    DATA RECORDER POWER DA-21 RION CO., Ltd. Startup screen Setting fi le No setting fi le found found...
  • Page 27 Power On/Off Note The input range and menu settings etc. at power-on will be the same as the settings that were active before the unit was last turned off. When the contents of a setting fi le are loaded at power-on, a channel selected for CCLD will be supplied with constant current.
  • Page 28 Power On/Off About the setting fi le You can store all setting values and parameters of the unit on the SD memory card as a setting fi le (DA21.INI). This capability allows you for example to store the optimum settings for a certain recording task and then quickly re-establish these settings at power-on.

  • Page 29: Display Explanation

    Display Explanation Display screen Recording/operation mode indication (page 20) Recording parameter indication (page 18) Trigger setting indication (page 21) Status indication (page 22) Channel data (page 24)
  • Page 30 Display Explanation Recording parameter indication From left, the display shows the frequency range [sampling frequency], elapsed recording time, recording time, and synchronization information. (2) Elapsed recording time (3) Recording time (1) Frequency range (4) Synchronization [Sampling frequency] information (1) Frequency range [Sampling frequency] Shows the setting made with <Rec.Parameters>...
  • Page 31 (The recording time also includes the pre-recording time of 1 second or 5 seconds.) (4) Synchronization information If you synchronize two DA-21 units, the unit used as master shows “Link. M” and the unit used as slave shows “Link. S” (see page 90).
  • Page 32 Display Explanation Recording/operation mode indication This fi eld shows recording and operation status information as well as all-channel overload information. (2) All-channel overload indication (1) Recording/operation mode indication (1) Recording/operation mode indication An icon indicates the current recording condition. None Normal condition Playback in progress (recall mode only), fl ashing Recording in progress, fl ashing...
  • Page 33 Display Explanation Trigger setting indication The trigger setting and type are shown here. When the trigger is set to OFF (Free), nothing is shown. (1) Trigger setting indicator (2) Trigger type (1) Trigger setting indicator This indicator appears if any trigger (except Free) has been set. (2) Trigger type None Free trigger (no trigger setting)
  • Page 34 Display Explanation Status indication In the second line from the bottom, the display shows the card icon, card capacity (size/available recording time), and in the bottom line, the icon and clock (date/time). (1) Card icon / remaining capacity (2) Icon (3) Clock (1) Card icon/remaining capacity The remaining card capacity is shown here in data size and the remain-...
  • Page 35 Display Explanation (2) Icon A graphic symbol representing the power supply status, key lock status, or menu lock status is shown here. : Shown when unit is being powered from an external source. : Shows the approximate remaining battery capacity when the unit is being powered from batteries.
  • Page 36 Display Explanation Channel data From left, the display shows the level trigger target channel, channel number/ overload information, bar graph, trigger level, monitor icon and range full- scale value. The data for four channels are shown simultaneously on the display. (4) Trigger level (5) Monitor icon (1) Level trigger...
  • Page 37 Display Explanation The overload history indication is cleared in the following cases: • Power-on • [CLEAR Ov] key pressed • Recording settings changed: • Frequency range • Sampling frequency • Input range • Channel setting (type, HPF, LPF, sensor type, scaling) •...
  • Page 38 Display Explanation (4) Trigger level When level trigger is used, a vertical line on the bar graph for the respec- tive channel shows the level trigger position. (5) Monitor icon icon is shown to the right of the bar graph for the channel selected for monitor output.
  • Page 39 Display Explanation CH5 data The CH5 fi eld either shows tachometer signal information or information about the use of the voice memo and marker function. (2) Bar graph and (1) Channel number / setting information overload information (1) Channel number/overload information The channel number (CH5) is shown here.
  • Page 40 Display Explanation • “Tacho” setting The rpm value of the input tachometer signal is shown. When “Tacho” is selected, the overload/underload evaluation conditions are as follows. Overload signal evaluation • “Over” is shown when revolution speed reaches or exceeds 600,000 rpm.
  • Page 41 Display Explanation History display Besides the bar graph format, the data display can also show a history graph of waveform data absolute values. (This is not available in recall mode.) To switch between the bar graph and history display, use the [>] or [<] key. The data shown on the history display are the data of the monitor channel.

  • Page 42: Menu Operations And Setting Items

    Menu Operations and Setting Items General menu operation steps Almost all settings of the DA-21 except for the input range setting are made via menus. To make a setting, you call up the menu from the menu list page. When a menu has been selected, the screen with the individual settings of that menu appears.
  • Page 43 Menu Operations and Setting Items 3. Open the menu page Press the [ENT] key. The items on the selected menu page appear. 4. Select an item Use the [ ] /[<]/[>] keys to move the cursor to the desired setting item. 5.
  • Page 44 Menu Operations and Setting Items 6. Detailed explanation of methods A, B, C A: Select setting item on sub menu Sub menu The sub menu appears when the [ENT] key is pressed. Select the setting from the sub menu. The following setting items have this type of sub menu.
  • Page 45 Menu Operations and Setting Items A-2 Press the [ENT] key. The change is accepted and the sub menu disappears. LPF OFF setting has changed to 200 Hz Confi rm change A-2’ By pressing the [MENU] key or [STOP] key instead of the [ENT] key, you can cancel the sub menu without changing the setting.
  • Page 46 Menu Operations and Setting Items B: Change setting value on sub menu Sub menu The sub menu appears when the [ENT] key is pressed. Change the setting value on the sub menu. The following setting items have this type of sub menu. <Input>...
  • Page 47 Menu Operations and Setting Items B-2 Press the [ENT] key. The change is accepted and the sub menu disappears. Sensitivity set- ting has changed to 130 dB from 100 dB Confi rm change B-2’ By pressing the [MENU] key or [STOP] key instead of the [ENT] key, you can cancel the sub menu without changing the setting.
  • Page 48 Menu Operations and Setting Items C: Execute (process) selected item This type of setting procedure applies to items such as “Card Format” and “Read / Save Settings” on the <System> menu. To execute the process, press the key corresponding to “Yes”. To cancel the process, press the key corresponding to “No”.
  • Page 49 Menu Operations and Setting Items 7. Changing an item on another menu page Press the [MENU] key to bring up the menu list. MENU To change an item on another menu page 8. Return to main screen Press the [MENU] key or [STOP] key to return to the main screen. MENU STOP Return to main screen...
  • Page 50 Menu Operations and Setting Items Menu fl ow diagram The organization of all menu operations is shown in the diagram below. Note that you always have to use the menu list to go to a menu page. M e n u s c r e e n MENU Menu list MENU...

  • Page 51: Menu Items

    Note When Input is set to AC, a high-pass fi lter with a cutoff frequency of 0.3 Hz is applied. However, if the input signal contains high-level DC components that exceed the input range, overload may occur in the DA-21.
  • Page 52 Menu Operations and Setting Items CCLD This setting is for microphones, accelerometers and other sensors that require a sensor drive power supply. (See the section starting on page 63.) (CCLD: Constant Current Line Drive) Note If the unit is operated on battery power, take the following points into account when setting the Inp to CCLD.
  • Page 53 Menu Operations and Setting Items High-pass fi lter frequency setting Enables a high-pass fi lter for the input signal. The HPF frequency indi- cates the cutoff frequency. Available settings are OFF and 5 Hz. When the Inp setting is DC, only the OFF setting is available for the high-pass fi lter.
  • Page 54 Menu Operations and Setting Items Sens Sensor type setting Lets you select the sensor type and make other sensor related settings. Available options depend on the Inp setting. Available Sensor settings (depending on Inp) and description setting Sens Description No setting available Record input voltage from sensor or measuring instrument as is.
  • Page 55 Menu Operations and Setting Items Sensitivity Unit conversion value setting Specifi es the relationship between input signal voltage and measurement value, according to the preceding Sensor type setting (Sens). Sens setting Sensitivity setting (depending on Sens) No setting Voltage per EU (V/EU) (Note that the EU setting value is the inverse of that used in the DA-20.) Constant Current Line Drive compatible microphone...

  • Page 56: Rec.parameters> Menu

    100 Hz / 500 Hz / 1 kHz / 5 kHz / 10 kHz / 20 kHz Sampling Frequency Sampling frequency setting The DA-21 provides a choice of two sampling frequency settings com- monly used for frequency analyzers and voice processing: 2.4 times or 2.56 times the frequency range. FFT analyzers generally use 2.56 times.
  • Page 57 Menu Operations and Setting Items Recording Time Recording time setting The recording time can be set in hours, minutes, or seconds, and a Manual setting is also available. When Manual is selected, the recording time is not preset, allowing the operator to press the [STOP] key whenever required.

  • Page 58: Trigger> Menu

    This is repeated with every trigger event until the [STOP] key is pressed or the SD memory card becomes full. Master If you synchronize two DA-21 units, the unit used as slave is selected this mode automatically.
  • Page 59 Menu Operations and Setting Items Type Trigger signal type setting Determines the type of trigger signal. When the “Mode” item is set to “Free”, this item does not appear. Level A trigger event occurs and recording is started when the level of the input signal in the specifi ed channel (trigger channel) becomes a preset value (trigger level) or higher.
  • Page 60 Menu Operations and Setting Items Start Time/Stop Time Recording start time/stop time setting Lets you specify a start time and stop time for recording. These settings can span two different calendar years. When the start time setting is before the current time, the setting auto- matically becomes “current time + 5 minutes”.
  • Page 61 Pressing the LIGHT key in the power save state temporarily turns on the LCD screen. If no further key is pressed, the unit will return to the power save state. Operation example for sleep mode DA-21 settings Mode: Repeat Start Time:...

  • Page 62: Bar Graph> Menu

    Menu Operations and Setting Items <Bar Graph> menu This menu serves for making bar graph display settings. Graph Bar graph display method Lets you select linear value display (Linear) or logarithmic value display (Log) for each channel. For details on the bar graph display method, see page 27. Linear / Log Note The Graph menu will be blank for channels whose...

  • Page 63: System> Menu

    Menu Operations and Setting Items <System> menu This menu comprises general items such as display backlight brightness and SD memory card data deleting. Read / Save Setting Read setting values from unit or SD memory card/Save setting values in unit or on SD memory card Load Default Settings Returns all unit settings to the initial (factory default) condition.
  • Page 64 Menu Operations and Setting Items Internal Memory (No. 1 to No. 5) Input range and other settings made with the menus can be saved in the internal memory of the unit, allowing them to be easily read (reloaded) later. Five sets of settings identifi ed as No. 1 to No. 5 can be saved. In the <Read / Save Setting>...
  • Page 65 Menu Operations and Setting Items Clock Settings Current date and time setting Date Select “Date” and press the [ENT] key. Set the year (to 2037), month, and day separately on the displayed sub menu. Time Select “Time” and press the [ENT] key. Set the hours, minutes, and seconds separately on the displayed sub menu.
  • Page 66 Index Device index number setting Using this setting, you can assign a unique number to each DA-21 device. The setting range is 1 to 255. Because the index number information is recorded along with the data, it can be used to identify multiple DA-21 units or data recording conditions.

  • Page 67: Synchronization> Menu

    Synchronize Synchronize connected DA-21 units Use the dedicated cable to connect the two DA-21 units to be used as master and slave. Select this item on both units and press the [ENT] key. The execution choice screen appears. Then press the [ENT] key on both unit simultaneously.

  • Page 68: Preparations

    Preparations This chapter describes the settings and steps to take before starting to record data. Preparations and checks before recording 1. Power supply (inserting batteries, AC adapter, wake-up-on-power mode) 2. SD memory card preparations (insertion and removal, formatting) 3. Connection of external devices (sensors etc.) 4.

  • Page 69: Preparations And Checks Before Recording

    Preparations Preparations and checks before recording Power supply The DA-21 can be powered from four IEC LR6 (size AA) batteries or from the optional AC adapter NC-98C. Important Use only the specifi ed AC adapter available as an option for the DA-21.
  • Page 70 2. Insert the plug of the supply cable from the AC adapter into the DC IN connector on the DA-21. 3. Plug the other end of the power cord into an AC outlet. To remove the AC adapter, turn the DA-21 off and then perform the above steps in reverse order. Voice Ext.
  • Page 71 Preparations Backup battery The unit uses a backup battery (rechargeable battery) to operate the clock. While power to the unit is on, the backup battery will be charged. It will also be charged while power to the unit is off if external power is connected. The relationship between charging time and retention period is shown below.
  • Page 72 Preparations Wake-up-on-power mode When you open the battery compartment cover as shown below, the [WAKE UP ON POWER] switch becomes accessible. By setting this switch to ON, you can have the on/off status of the unit controlled by the power supplied to the DC-IN connector.

  • Page 73: Sd Memory Card Preparations

    DA-21 is required on the card. When you insert a blank SD memory card and format it by the DA-21, this directory structure and data management fi le are automatically created.
  • Page 74 Preparations Inserting and removing an SD memory card Important Make sure that power is OFF before inserting or removing a card. Take care to insert the SD memory card with correct orientation. If the SD memory card is removed while data is being read or written to the card, the data may be destroyed.
  • Page 75 Preparations Formatting an SD memory card Note When an SD memory card is formatted (initialized), all data present on the card will be lost. But the setting fi le will remain if the card is formatted by this unit. In the following cases, you should format the SD memory card: •...

  • Page 76: External Equipment (Sensor Etc.) Connections

    Preparations External equipment (sensor etc.) connections As shown below, the DA-21 is designed to handle the output of various sensors or measuring instruments. Correct input settings must be made, depending on the sensor and signal type and whether the sensor requires a constant current power supply.

  • Page 77: Input Settings

    Line Drive) type sensor. Some CCLD sensors use a basic preamplifi er + accelerometer or microphone confi guration. The DA-21 can record up to four input signals. The input connectors 1 to 4 are assigned to channels 1 to 4.
  • Page 78 Preparations Sensitivity setting (<Input> menu: Sens, Sensitivity) Sensor setting Depending on the input setting described on the preceding page (AC, DC, CCLD, VP4x), set the “Sens” item for the combinations marked with a “ ” in the table below. EU (Engineering Units) is a unit symbol for expressing various physical quantities detected by a sensor.
  • Page 79 Preparations Sensitivity setting This setting determines the correlation between input signal voltage and signal units. How the values are to be set for each signal unit is explained below. mV/(m/s Set the voltage sensitivity of the accelerometer. Example: For PV-90I rated for 0.44 mV/(m/s ), the setting should be “0.44”.
  • Page 80 Preparations The table below shows the correlation formula for the original input range X [V] and the condition after the sensitivity setting. Sensitivity Unit Inp (Sens) type Input range value after conversion value X[V] None DC/AC(---) K[V/EU] [EU] DC/AC(EU) S[dBV/Pa] [dB] MIC(CCLD) 94-S-3+20 log...
  • Page 81 Note When Inp is set to AC, a high-pass fi lter with a cutoff frequency of 0.3 Hz is applied. However, if the input signal contains high-level DC components that exceed the input range, overload may occur in the DA-21.

  • Page 82: Recording Parameter Settings

    The input range can be set to seven levels in 10 dB steps (0.01, 0.03, 0.1, 0.3, 1, 3, 10 V). Select an appropriate setting according to the input signal level and the operation method of the DA-21. For improved S/N ratio, setting the input range as low as possible without causing overload is generally preferred.
  • Page 83 Preparations 3. Activate the range change mode. Press the [ENT] key to bring up the sub menu. 4. Select the new input range setting. Use the [ ] keys to change the input range. 5. Confi rm the new input range setting. Press the [ENT] key to return to the condition of step 2.
  • Page 84 Preparations Input range setting and overload When setting the input range, check whether overload occurs. When this happens, the overload indicator on the front panel lights up in red, and the indication appears on the display. To improve reliability and ensure that overload does not occur for an extended period, the overload history indication is convenient.

  • Page 85: Sampling

    Preparations Sampling The sampling action of the DA-21 is controlled by the frequency range and sampling frequency setting. The sampling frequency can be set to 2.4 times or 2.56 times the frequency range. Setting the frequency range The frequency range can be set in six steps (100 Hz, 500 Hz, 1 kHz, 5 kHz, 10 kHz, 20 kHz).

  • Page 86: Recording Process

    Preparations Recording process When you press the [REC] key, the data recording operation starts. Howev- er, if the trigger function (described later) is used, recording may not begin right away. In such a case, actual recording will only start when the trigger conditions are met, or in other words when a trigger event occurs.
  • Page 87 6 seconds or higher. The recording time setting cannot exceed the remaining available capacity of the SD memory card inserted in the DA-21. If this applies, the recording time will automatically be changed to the maximum available time when the...
  • Page 88 Preparations Setting the Pre Recording Time If you wish to include data from a point slightly before the [REC] key was pressed or before the trigger event, use the Pre Recording Time function. Available pre-recording settings are 0, 1, and 5 seconds. The overall recorded data length will correspond to the recording time.
  • Page 89 For the “Time” trigger the start/stop time and interval must be set. Only trigger events that occur while the DA-21 is in the trigger standby condition are valid. Any trigger events that occur while data recording is in progress are disregarded.
  • Page 90 Preparations Recording procedure Data recording in progress Free Recording procedure Trigger Data recording in progress standby Single Recording procedure Trigger Trigger Data recording in progress Data recording in progress standby standby Repeat During data recording, trigger event is disregarded. Trigger events Difference in recording procedure according to trigger mode (Pre Recording Time: 0, Recording Time: other than Manual, Trigger Type: Level or External)
  • Page 91 If the input signal reaches a trigger level, recording will be started from the point of time. However, with the cause of data processing of DA-21, the recording is started later than the time which ful- fi lled trigger conditions.
  • Page 92 Preparations Time Recording is carried out from the specifi ed Start Time to the spec- ifi ed Stop Time, at intervals as specifi ed by the Interval setting. Note The “Pre Recording Time” setting in <Rec.Param- eters> menu has no effect. When the Stop Time is reached, recording will stop, also if the Recording Time is not yet completed.
  • Page 93 Preparations Setting the trigger level When the trigger type is set to “Level” (level of signal at input connector), the actual level to be used as a trigger level must be set as a percentage [%] of the full-scale value of the current input range. Make the setting using the “Level”...
  • Page 94 Preparations Setting the recording interval When the trigger mode is set to “Repeat” and the trigger type is set to “Time”, set the interval as follows. The interval setting cannot be shorter than the Recording Time setting. Make the setting using the “Interval” item in <Trigger> menu. When Stop Time is reached before Recording Time is up Start Time Stop Time...
  • Page 95 Preparations Repeat trigger precaution If trigger conditions are met while a fi le is being closed, the next recording will not start. Trigger event occurs during file save Disregarded (recording does not start) Data recording Data recording File is File is in progress being written in progress...

  • Page 96: Auxiliary Function Setup

    Some possible uses for the index number capability are listed below. 1. Temporary management (classifi cation) of recorded data Example 1 In a system where several DA-21 units are used, the index number can serve to manage data according to the unit on which the data were recorded.

  • Page 97: Voice Memo/Marker

    Preparations Voice memo/marker The voice memo function allows the operator to add comments before and after the recording procedure or during recording. The marker function can be used to mark a certain position, for example when a particular phenom- enon occurred during recording. This makes it easy to later locate the data for that point.
  • Page 98 Preparations Comparison of voice memo and marker operation The diagram below illustrates the operation principle of the voice memo and marker function. The functions differ in the action that occurs when the microphone switch is pressed. Recording start Voice memo Voice memo Voice memo Voice Memo...

  • Page 99: Preventing Inadvertent Operation (Key Lock And Menu Lock)

    Preparations Preventing inadvertent operation (key lock and menu lock) This section explains the key lock and menu lock functions that serve to prevent operation errors when performing data recording in the fi eld. Key lock Makes almost all keys inactive Pressing and holding the [<] and [>] keys together for a few seconds activates the key lock condition.
  • Page 100 Preparations Menu lock Changing menu settings and deleting data are disabled Opening the battery compartment cover gives access to a slide [MENU] switch in the lower left section, as shown in the illustration below. When you set this switch to the LOCK position, menu settings cannot be changed, and data in recall mode cannot be deleted.

  • Page 101: Remote Control Operation

    DA-21 used to record data under a given set of conditions. Because the Remote Controller is designed to be operative also when the key lock feature is enabled, the DA-21 can be protected from inadvertent operation.

  • Page 102: Connection To A Computer

    USB, without having to install a USB driver. Connecting steps 1. Connect the USB connector of the DA-21 with a USB connector of a computer, using the optional (generic) A - mini B USB cable as shown below.

  • Page 103: Inter-Unit Synchronization

    Preparations Inter-unit synchronization Using two DA-21 units and the separately available dedicated cable, synchronized operation with one unit functioning as master and one unit as slave is possible. Important Establish the same settings on both DA-21 units (<Rec.Parameters> menu items). If settings are different, synchronized operation is not possible.
  • Page 104 Preparations 2. Access the menu list and open the <Synchronization> menu. 3. In the “Master / Slave” sub menu, select “Master” on the DA-21 to use as master unit and “Slave” on the DA-21 to use as slave unit. 4. Enable synchronized operation by selecting “Synchronize” in the <Synchronization>...

  • Page 105: Tachometer Signal Input

    Tachometer signal input The rotary pulse input connector serves for input of a rotary pulse signal (Tacho signal). The DA-21 can record the revolution speed derived from a rotating object such as a fan or motor. When the “Inp” item for CH5 in the <Input> menu is set to “Tacho”, the indication appears, and the revolution speed is displayed.

  • Page 106: Recording

    When there has been no change in sensors and recording parameters, this step may be omitted from the second time onwards. If the sensitivity setting of the DA-21 can be considered to provide suffi cient accuracy, recording a calibration signal is not necessary.
  • Page 107 Is device index number setting appropriate? (See page 84.) 3. SD memory card Is SD memory card certifi ed for use in DA-21? (Insert card and check for messages.) (See pages 12, 61, 121) Is enough remaining capacity available? Is spare SD memory card available? (Set number of channels and recording parameters as required, and then check remaining recording time on main screen.)

  • Page 108: Input Range Setting / Calibration Signal Recording

    Recording 2. Input range setting / Calibration signal recording Changing the input range setting 1. Press the [RANGE] key to cause the input range display section to be shown in reverse (cursor active). 2. Use the [ ] keys to move the cursor to the channel whose input range setting you want to change.
  • Page 109 In actual use, the operator should decide whether calibra- tion is necessary, based on information given in this manual and other data. 1. Input range setting of the measuring instrument (not DA-21) was changed. The instrument may change output signal being supplied to DA-21 when input range setting is changed even at the same input signal.

  • Page 110: Recording

    Any [REC] key operation is disregarded. [Card Error. Remove card or format card.] An SD memory card that cannot be used in the DA-21 was inserted. Press any key to clear the message. Any [REC] key operation is disregarded. Format the card by the DA-21 or insert another SD memory card.
  • Page 111 Recording < When does the recording procedure stop? > The recording procedure stops in the following cases. 1. The amount of data corresponding to the recording time setting has been recorded. 2. There is no more remaining space on the SD memory card. 3.
  • Page 112 Recording Terminating a recording partway Press the [STOP] key. The REC indicator and the REC icon go out and record- ing stops. STOP After a long-term recording or when there is a large number of fi les on the SD memory card, data recording to the SD memory card may take some time.
  • Page 113 Recording Recording procedure conditions and indicator/icon status The various conditions of the unit during the recording procedure can be checked using the indicators and the icon status. The two illustrations below show the various conditions, with and without the use of the trigger function. (Flashing of an indicator or icon is indicated in the illustration as Recording procedure Operation condition...

  • Page 114: Using The Voice Memo/Marker Function

    Recording Using the voice memo/marker function Voice memo Voice memo recording on the SD memory card starts when the microphone switch is pushed and stops when the switch is released. The audio level is indicated by the bar graph for CH5 during voice memo is activated, and the icon is shown on the right side of the bar graph.
  • Page 115 Recording Marker When the microphone switch is pressed while data are being recorded, the current time is recorded as a marker. The icon is shown on the right side of the bar graph for CH5 during marker is selected. Pressing the switch also causes the icon to fl ash for about one second.
  • Page 116 Recording Recording of data Trigger event corresponding to recording time is completed. Recording start Trigger Recording in progress standby Voice Voice Voice memo memo memo Voice Memo Voice Input signal memo Marker This time point This time point is recorded is recorded Released Microphone...

  • Page 117: Data Recording Example

    DA-21. Input the comparator signal of the sound level meter to the Ext. Trig. con- nector of the DA-21, using the comparator output cable CC-42C. For voice memo recording, connect the optional voice memo microphone to the Voice Input connector.
  • Page 118 Recording Recording parameters Recording parameters Recording parameters Item Setting Item Setting Trigger mode Repeat Trigger type External Recording time 15 s Pre Recording Time 5 s Frequency range 20 kHz Sampling frequency ×2.56 Input range Suitable value Procedure 1. Record calibration signal of sound level meter (at this time, trigger mode should be set to “Free”).
  • Page 119 BNC-mini plug cable CC-24S (CC-24 can also be used) To Input 1 connector To Ext. Trig. connector To Voice Input connector DA-21 File name corresponding to File name corresponding to File name corresponding to the recording start time the recording start time...

  • Page 120: Recall/Playback Of Recorded Data

    Recall/Playback of Recorded Data You can call up a list of recorded data and select data for playback and for checking. You can also delete unwanted data or determine whether data have to be recorded again. (For a fl ow chart of the overall operations described in this section, see page 118.) Activating recall mode Press the [RECALL] key.
  • Page 121 Recall/Playback of Recorded Data Viewing recorded data The Select File screen shows the recording start time and status of the data. The Status fi eld shows “Voice Memo” if this was recorded during a recording procedure. The Status fi eld also shows “TACHO” if this was the tachometer signal.
  • Page 122 Recall/Playback of Recorded Data Selecting recorded data for playback Move the cursor to the recorded data you want to play back, and press the [ENT] key. The recall screen appears, and the recorded data can be played back. Recording time Select File screen Channel number /...

  • Page 123: Playback Of Recorded Data

    Recall/Playback of Recorded Data Playback of recorded data The recall screen gives access to various operations related to playback of recorded data. Playing recorded data Press the [PLAY] key. Playback of recorded data starts. During playback, the PLAY indicator at the top right of PLAY the [PLAY] key fl ashes, and the playback icon fl ashes...
  • Page 124 Recall/Playback of Recorded Data Stopping playback partway Press the [STOP] key. The PLAY indicator and playback icon go out, and the STOP unit returns to the recall screen. STOP Pausing and restarting playback Press the [PAUSE] key. Playback is halted temporarily. In this condition, the pause PAUSE icon fl ashes on the display.
  • Page 125 Recall/Playback of Recorded Data Performing fast forward or reverse during playback Press and hold the [>]/[<] keys. While you press the [>] or [<] key, the playback position is moved quickly forwards or backwards. During this time, no playback signal is output. If the playback position was moved all the way to the end of the recorded data, playback will stop when you release the [>] key.
  • Page 126 Recall/Playback of Recorded Data Performing high-speed forward or reverse during playback While playback is paused, press and hold the [>] or [<] key. When you hold down the [>] or [<] key for about one sec- ond, high-speed forward or reverse starts and the playback position is moved quickly forwards or backwards.

  • Page 127: Canceling Recall Mode

    Recall/Playback of Recorded Data Canceling recall mode When you press the [RECALL] key at the Select File screen, the recall mode is terminated and the unit returns to the main screen. If a recall screen is currently shown, press the [RECALL] key once to return to the Select File screen, and then press it again to cancel the recall mode.
  • Page 128 Recall/Playback of Recorded Data About the supplied viewer software The supplied viewer software can be used to read waveform information of recorded data from the SD memory card and display it on a computer. The fi le structure on the SD memory card is as follows. DA21.INI Setting file Record...
  • Page 129 Recall/Playback of Recorded Data The DA21.INI fi le contains information about all settings of the DA-21 (see page 52). You can also store the fi le with a suitable fi le name on the computer, and use different fi les to manage various settings.
  • Page 130 Recall/Playback of Recorded Data Recall Mode Operation Flow Chart R e c a l l m o d e Select File screen RANGE RECALL Delete selected Change recorded data file number RECALL Recall screen Change file number PLAY STOP End is reached during playback [Playback in progress] Playback screen...

  • Page 131: Messages

    Messages During operation of this unit, various messages giving warnings and providing procedure information will appear. The most important messages are listed and described in this section. (The actual font and placement of the message on the display may differ from the examples shown here.) Messages are listed below.
  • Page 132 Messages Description At power-on, the unit performs various adjustment routines. If these cannot be completed within a certain period, this message appears. Countermeasure Press the [ENT] key to clear the message, and then perform a power-down, power-on cycle. Condition Indication “Adjustment Executing” was displayed for about 1 minute during the power-on phase.
  • Page 133 FAT16 or FAT32, or the card is defective. Countermeasure Press the [ENT] key to clear the message. Format the card in the DA-21. If the message is still shown, try a different SD memory card. Formatting a card will permanently delete all data present on the card.
  • Page 134 Messages Description All channels are set to OFF. Countermeasure Press the [ENT] key to clear the message. The unit is functioning normally, but data cannot be recorded. To record data, set at least one channel to a setting other than OFF. Condition Quitting a menu screen and returning the main screen.
  • Page 135 Messages Description The maximum number of data that can be recorded with the DA-21 has been reached. Countermeasure Press the [ENT] key to clear the message. Copy the existing fi les on the SD memory card to a suitable location on the computer, and then format the SD memory card.
  • Page 136 Messages Description No SD memory card is inserted in the DA-21. Countermeasure Press the [ENT] key to clear the message. Insert an SD memory card. Condition Attempted to start recording procedure. Tried to enter recall mode. Description “USB Storage” in the <System> menu is selected ON.
  • Page 137 Other- wise the card may become unusable until formatted in the DA-21 (at this time, previously recorded data will also be destroyed). While the message is being shown, the [REC] key is inactive and any trigger event is disregarded.
  • Page 138 Messages Description This message appears at power-on if the input range and menu settings from the last use could not be saved properly. All settings will return to the factory default condition. Countermeasure Press the [ENT] key to clear the message. Make the required settings again before starting to record.
  • Page 139 DA-21 units was canceled. Countermeasure Press the [ENT] key to clear the message. Repeat the synchronization procedure (page 91) when you would like to synchronize two DA-21 units again. Condition When the synchronization of DA-21 units was can- celed.

  • Page 140: Filter Characteristics

    Filter Characteristics The characteristics of the built-in low-pass and high-pass fi lters are shown below. The available low-pass fi lter settings are OFF, 200 Hz, 1 kHz, and 2 kHz, but the setting must be equal to the frequency range setting or lower. When the OFF setting is selected, the low-pass fi lter is set to the cutoff frequency of the frequency range.

  • Page 141: Settings And Other Information

    Settings and Other Information This section lists all menu settings, data recording operation types, and other relevant information. Approximate recording times The approximate recording times available with an SD memory card inserted in the unit are as shown in the table below. The fi gures apply to a bit length setting of 16 bit.

  • Page 142: Menu Items

    Settings and Other Information 32 GB SD memory card (Sampling frequency: ×2.56) Number of Frequency range channels 100 Hz 500 Hz 1 kHz 5 kHz 10 kHz 20 kHz 17066 h 3413 h 1706 h 341 h 170 h 85 h 40 m 20 m 40 m...
  • Page 143 Settings and Other Information <Trigger> menu (page 46) Item Description Settings Mode Trigger mode [Free] / [Single] / [Repeat]* / [Master] [Level] / [External] / [External Gate] / Type Trigger signal type [Time] Level Trigger level * [0.1 to 0.9%] / [1 to 99%] Trigger channel * [Ch1] to [Ch4] Start time *...
  • Page 144 Settings and Other Information <System> menu (page 51) Item Description/Operation Settings Read / Save Settings Read or save the setting values Load default settings Initialize the setting values to default Internal Memory Apply or save the setting values to the unit (No.

  • Page 145: Data Recording

    Settings and Other Information Data recording The unit offers 16 different (13 practical) combinations of recording time and trigger settings. The tables below list combinations that are useful from a practical point of view. Data recording operation type Recording Type Mode Parameter time setting...
  • Page 146 Settings and Other Information Validity of pre-recording settings etc. depending on trigger conditions Recording stop due to Combination Pre-recording [STOP] key operation or Trigger Post-recording (previous table) (Pre Recording Time) insuffi cient SD memory card capacity Mode Free (1)(8) × Level (2)(3)(9)(10) ×...
  • Page 147 Settings and Other Information Data recording: Recording time (1 s to 24 h), no trigger (1) Recording time (1 s to 24 h) Recording completed Recording in progress (1) Free Data recording: Recording time (1 s to 24 h), Level trigger (2), (3) Recording time Recording time (1 s to 24 h)
  • Page 148 Settings and Other Information Data recording: Recording time (1 s to 24 h), Time trigger (6), (7) Recording time Recording time Recording time (1 s to 24 h) (1 s to 24 h) (1 s to 24 h) Trigger Recording Recording ends when stop time Recording completed (6) Single...
  • Page 149 Settings and Other Information Data recording: Manual (controlled with [STOP] key), External trigger (11), (12) STOP Trigger (11) Single Recording in progress Recording completed standby Trigger Recording in progress standby Recording completed (12) Repeat Ext. Trig. connector signal External trigger event Data recording: Manual (controlled with [STOP] key), Time trigger (13), (14) STOP...

  • Page 150: Representative Value Of Inherent Noise

    Settings and Other Information Representative value of inherent noise Representative value of inherent noise of the unit which connected a sensor is shown in the table below. Those representative values are levelized by AS-70. (HPF setting and LPF setting of the unit are OFF.) Representative values Sensors Remarks...

  • Page 151: Wave File Format

    Basic structure The WAVE fi le is made up of variable-length blocks called “chunks”. The basic structure is as follows. The chunks and fi le structure used by the DA-21 are shown below. RIFF Wave Chunk groupID = "RIFF" RIFF header chunkSize = size of following data riffType = "WAVE"...

  • Page 152: File Structure And Size

    WAVE File Format The chunks and fi le structure used by the DA-21 are shown below. RIFF header 12 bytes 24 bytes fmt sub chunk 24 bytes Type sub chunk 40960 bytes Marker chunk Reserved 40960 bytes Common settings 82936 bytes...

  • Page 153: Invalid Values

    WAVE File Format Invalid values For unused items, a value defi ned as an invalid value is inserted. The invalid values for the respective data types are shown in the table below. Type Invalid values char Blank int16 Minimum value uint16 Maximum value int32...

  • Page 154: Data Types

    WAVE File Format Data types The DA-21 uses the following specially defi ned data types. typedef struct { uint32 dwDataAddress; /* < Address as counted from start of data chunk uint32 dwDataSize; uint32 dwFatDateTime; } MARKERFORMAT; typedef struct { year /* <...

  • Page 155: Chunks

    WAVE File Format Chunks The following tables provide details about the structure of the RIFF header (RIFF chunk) and the various sub chunks listed in the section “File structure and size” (page 140). RIFF chunk Table 1 RIFF chunk Variable Size Type Description...
  • Page 156 WAVE File Format wBitsPerSample nAvgBytesPerSec = nSamplesPerSec × nChannels × Fig. 1 nAvgBytesPerSec wBitsPerSample nBlockAlign = nChannels × Fig. 2 nBlockAlign Type sub chunk Table 4 Type sub chunk Size Type Variable name Description Value (Byte) Indicates chunk type char[4] Chunk ID "TYPE"...
  • Page 157 WAVE File Format CommonShareSetting (common) chunk Stores setting information of the unit, including trigger settings etc. Table 5 CommonShareSetting (common) chunk Size Variable Type Description Value (Byte) name Indicates chunk type char[4] Chunk ID "CSET" Total size of following data uint32 Chunk Size (not including this item)
  • Page 158 WAVE File Format Size Variable Type Description Value (Byte) name Unit AA.BB.XXYY int32 SubMicon Sub-microcomputer version (8 digits in hex number) Version 0: Free Trigger int16 Trigger mode 1: Single Mode 2: Repeat 4: External Trigger 8: External Gate Trigger source int16 Source 16: Level...
  • Page 159 WAVE File Format CommonChSetting (each CH) chunk Stores setting information of the unit, including each channel (for four chan- nels) settings etc. Table 6 CommonChSetting (each CH) chunk Size Type Variable name Description Value (Byte) Reserved int16 Chx Number Channel number 1 to 4 0: false int16...
  • Page 160 WAVE File Format Size Type Variable name Description Value (Byte) Reserved Calibration value (nota- Chx Zero dB Setting value on double tion of 0 dB reference Reference (EU) calibration index) 0: No overload has occurred Overload information in uint16 Chx Overload 1: Overload has the fi le occurred at...
  • Page 161 WAVE File Format Tacho Settings chunk Table 8 Tacho Settings chunk Size Type Variable name Description Value (Byte) Indicates chunk type char[4] Chunk ID "TSET" Total size of following data uint32 Chunk Size (not including this item) Pulse Per uint16 Number of pulses per rotation 1 Rotation Reserved...
  • Page 162 WAVE File Format Marker chunk This chunk contains information about the start position and date/time of marker events during recording. Regardless of whether the WAVE fi le com- prises marker data, the Marker chunk is always added. Size is fi xed to 12 bytes × 3412 + 8 + 8 = 40960 bytes. Upper limit is 3412 positions.
  • Page 163 WAVE File Format Wave Data chunk Recorded raw waveform data are stored here. Table 11 Wave Data chunk Size Type Variable name Description Value (Byte) Indicates chunk type "data" char[4] Chunk ID Total size of following data uint32 Chunk Size See Fig.

  • Page 164: Specifi Cations

    Specifi cations Applicable standards CE marking, WEEE Directive, Chinese RoHS Input section Input connectors Signal input × 4 (BNC) Revolution speed (rotary pulse) × 1 (BNC) Voice memo input × 1 (voice memo microphone: 3.5 mm dia. 4-pole mini jack) External trigger input ×...
  • Page 165 Specifi cations Frequency response DC coupling DC to 1 Hz: ±1.0 dB 1 Hz to 12.5 kHz: ±0.5 dB 12.5 kHz to 20 kHz: ±1.0 dB AC coupling 1 Hz: ±1.0 dB 1 Hz to 12.5 kHz: ±0.5 dB 12.5 kHz to 20 kHz: ±1.0 dB Inter-channel phase lag 1 deg max.
  • Page 166 Specifi cations Rotary pulse Input impedance 100 kΩ or more Input voltage range 0 V to 10 V (Open collector supported, TTL supported) Threshold level Approx. 2.5 V Counting method Periodic counting Measurable revolution speed range 200 rpm to 600,000 rpm (1 pulse / rotation) Output section Output connectors Playback output...
  • Page 167 Playback output selection Output both from playback output and monitor output connectors Recording section Recording media SD memory card (Operation assured only with RION supplied SD memory cards) Maximum capacity: 32 GB File system FAT16, FAT32 A/D converter 24 bit quantization...
  • Page 168 Specifi cations Trigger section Trigger source External: Open collector supported (internal 3.3 V, 50 kΩ) • External • External Gate (Compatible with comparator output of Sound Level Meter NL-62, NL-52, NL-42) Internal • Level trigger (wave form): 0.1% to 0.9%, 1% to 99% of input range full-scale, linear peak •...
  • Page 169 Specifi cations Store settings Five settings are stored in internal memory Startup fi le is available in the SD memory card Mass storage class Connected to a computer as a storage device, and recognized as a removable disk Power supply section Power supply Batteries or AC adapter (NC-98C) Car battery adapter (CC-82)
  • Page 170 Specifi cations Operating environment Temperature -10°C to +50°C Humidity 90% RH Max. (Non-condensing) Altitude 2000 m Max. Pollution Degree 2 Installation Category Ambient conditions for storage -10°C to +50°C, max. 90% RH (no condensation) Supplied accessories IEC LR6 (size AA) alkaline battery CD-ROM (Instruction manual, Viewer software AS-70 Viewer) 1 Inspection certifi cate Optional accessories...
  • Page 171 Specifi cations Rear view Front view Right side view Unit: mm Dimensional Drawings...
  • Page 172 No. 59374 16-07...

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