Rion DA-21 Instruction Manual

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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/

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Page 3

Organization of this manual

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 con gure

a measurement system, consult the documentation of all other components as well.

The section starting on page iii contains important information and precautions

about safety. Be sure to read and observe these in full.

This manual contains the following sections.

Outline

Gives basic information on the unit.

Controls and Functions

Explains the keys, indicators, connectors, and all other parts on the panels

of the unit.

Power On/Off

Explains how to turn the unit on and off.

Display Explanation

Explains the various items that are shown on the display panel.

Menu Operations and Setting Items

Lists the basic steps that are common to all menus, and explains the indi-

vidual setting items.

Preparations

Explains checks and other steps to take before starting to record. Sensor

connection and setup as well as other functions are also explained here.

Recording

Explains the recording process as well the voice memo and marker functions.

Recall/Playback of Recorded Data

Explains how to recall and delete recorded data.

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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  lter and low-pass  lter characteristics.

Settings and Other Information

For convenient reference, this section lists all menu settings, data recording

operation types, and other relevant information.

WAVE File Format

Provides information about the WAVE  le format used by the unit for

recording data.

Speci cations

Lists the technical speci cations of the unit.

* Company names and product names mentioned in this manual are usually

trademarks or registered trademarks of their respective owners.

The product described in this manual is in conformity with the fol-

lowing European standards;

Conforming Standards

CE Marking

Low Voltage Directive: 2006/95/EC EN61010-1:2010

EMC Directive: 2004/108/EC EN61326-1:2013

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.

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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.

Caution

Important

Note

Disregarding instructions

printed here incurs the risk of

injury to persons and/or dam-

age to peripheral equipment.

Disregarding instructions

printed here incurs the risk of

damage to the product.

Contains special information

that is helpful in utilizing the

features of the unit, but that is

not directly related to safety.

iii

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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. Inserting

this disc in a CD player poses the risk of excessive volume levels that can

cause hearing damage and damage to the CD player.

Be careful around rotating machinery

When using the unit near rotating machinery, take care that cables cannot

be caught in the machinery.

Avoid excessive force and abrupt operation

Applying strong force to the keys or card slot cover of the unit can lead to

damage and injury. When connecting or disconnecting cables and opening

or closing the card slot cover, take care not to pinch your  ngers.

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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. Otherwise there is a risk of damage to the CD-ROM drive.

Handle batteries correctly

If batteries are inserted with wrong polarity or otherwise mishandled, battery

 uid may leak and overheating may occur.

Do not apply excessive voltage

Make sure that voltage applied to the power supply connector (DC IN), to the

Input connectors, and to the external trigger (Ext. Trig.) connector does not

exceed the speci ed values. Otherwise there is a risk of damage to the unit.

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Usage Precautions

Operate the unit only as described in this manual.

Observe the following conditions with regard to locations for use and

storage of the unit:

• Do not use or store the unit in locations where the speci ed permis-

sible range for temperature and humidity may be exceeded (-10ºC to

+50ºC, max. 90% RH).

• Do not use or store the unit in locations where there are rapid and

drastic changes in temperature or where there is a possibility of con-

densation.

• Do not use or store the unit in locations that may be subject to splashes

of water or other liquids.

• Do not use or store the unit for an extended time in locations that may

be exposed to direct sunlight.

• Do not use or store the unit in locations that may be subject to air

with high salt or sulphur content, or subject to the in uence of gases

and other chemicals.

• Do not use or store the unit in slanted or instable locations.

• Do not use or store the unit in locations that may be subject to vibra-

tions or shock.

If batteries are inserted with wrong polarity or otherwise mishandled,

battery  uid may leak and overheating may occur.

Make sure that voltage applied to the power supply connector (DC IN)

and to the signal Input connectors does not exceed the speci ed values.

Take care that cables and other parts cannot be caught in rotating ma-

chinery.

Do not apply strong force to the keys or card slot cover of the unit. Oth-

erwise there is a risk of damage to the unit or injury to  ngers etc. When

connecting or disconnecting cables and opening or closing the card slot

cover, take care not to pinch your  ngers.

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.

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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.

If it starts raining while using the unit outside, stop the measurement and

protect the unit from getting wet. In case the unit gets wet, wipe it with

a dry cloth and let it dry in a well-ventilated place.

Always turn the unit off after use. Remove the batteries from the unit

if it is not to be used for a long time. Otherwise battery  uid may leak,

posing a risk of corrosion and damage. Also disconnect the AC adapter

or battery pack.

Do not tap the LCD panel or other surfaces of the unit with a pointed

object such as a pencil, screwdriver, etc.

Take care that no conductive objects such as wire, metal scraps, conductive

plastics etc. can get into the unit.

Do not disassemble the unit or attempt internal alterations. In case of

malfunction, do not attempt any repairs. Note the condition of the unit

clearly and contact your supplier.

Clean the unit only by wiping it with a soft, dry cloth or, when necessary,

with a cloth lightly moistened with water. Do not use any solvents, cleaning

alcohol or chemical cleaning agents.

When returning the unit for maintenance or servicing, use the original

packing to protect it from shocks and vibration.

The life of the backup battery for the internal clock of the unit is lim-

ited. You should have the battery replaced about once every  ve years.

Regarding replacement of the battery, please contact your supplier.

Please note that this product is warranted up to the product purchase price

against defects in material.

Dispose of the unit and of batteries only according to national and local

regulations at the place of use.

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AC adapter precautions

Use only the speci 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.

Open source software

This product contains the open source software of the following licenses.

(1) GPL

(2) GPL v 2

(3) GPL v 3

(4) Boost Software License

Those source codes of the open source software according to the li-

cense agreement will be given. Those source codes are available for

download from the Rion Support Room (http://svmeas.rion.co.jp/).

Note that we assume no responsibility for the source code.

Note that we are not responsible for exact details of the source code.

For details on the license, click [Manual] - [Open Source License]

folder in the supplied CD-ROM.

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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> menu .....................................................................39

<Rec.Parameters> menu .....................................................44

<Trigger> menu..................................................................46

<Bar Graph> menu .............................................................50

<System> menu ..................................................................51

<Synchronization> menu ....................................................55

Preparations ..................................................................................56

Preparations and checks before recording ................................57

Power supply ......................................................................57

SD memory card preparations ............................................ 61

External equipment (sensor etc.) connections .....................64

Input settings ......................................................................65

Recording parameter settings ...................................................70

Input range setting ..............................................................70

Sampling ............................................................................73

Recording process .............................................................. 74

Auxiliary function setup ..........................................................84

Device index number (<System> menu: Index) ...................84

Voice memo/marker ...........................................................85

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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. Recording ............................................................................98

Using the voice memo/marker function .................................. 102

Data recording example .........................................................105

Recall/Playback of Recorded Data .............................................. 108

Activating recall mode ...........................................................108

Playback of recorded data ...................................................... 111

Canceling recall mode ........................................................... 115

Other information .................................................................. 115

Messages ..................................................................................... 119

Filter Characteristics ...................................................................128

Settings and Other Information ...................................................129

Approximate recording times ................................................129

Menu items ............................................................................130

Data recording .......................................................................133

Representative value of inherent noise ...................................138

Power save settings ................................................................ 138

WAVE File Format ...................................................................... 139

Basic structure ....................................................................... 139

Basic WAVE  le structure ................................................ 139

File structure and size ...................................................... 140

Invalid values ......................................................................... 141

Data types .............................................................................. 142

Chunks .................................................................................. 143

Speci cations .............................................................................. 152

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Outline

The DA-21 is a compact, lightweight data recorder designed for waveform

recording. The unit can be powered from batteries, for convenient use in the

 eld.

To record sound or vibration waveforms, microphones or accelerometers can

be connected easily. 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.

Features

The unit has the following features.

Simultaneous recording of electrical signals in up to 4 channels.

Compact and lightweight body ensures easy portability. A set of four

IEC LR6 (size AA) alkaline batteries will power the unit for about

8 hours of continuous use (at 23ºC, frequency range setting 100 Hz,

4-channel input, CCLD off, backlight off).

CCLD support allows easy hookup of sensors including microphones

and accelerometers.

A wide range of sensors for converting sound pressure, vibrations,

rotation, temperature or other measurement quantities into an electrical

signal (AC or DC) is supported. Measurement quantities measured

by sensors are displayed in units “V”, “V/EU”, “mV/(m/s2)” or “dB”

with a user selectable setting range.

Frequency range from DC to 20 kHz allows recording of a wide range

of phenomena.

Recorded data are stored on SD memory card in WAVE format. For

example, when using a 32 GB card, available recording time with the

20 kHz frequency range setting and continuous recording in 4 input

channels is about 23 hours.

Voice memo and marker information can also be recorded, to facilitate

later data management.

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Outline

Accurate playback of data is possible, making it easy for example to

check the reliability of data in the  eld. The playback signal can also

be output to an analyzer or similar equipment.

Supplied viewer software (AS-70 Viewer) for use on a computer

provides the required features for checking and storing the recorded

waveform data (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.

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System con guration

Target

Automobile running test (sound and vibration data)

Road traffic noise (sound pressure waveform data)

Product inspection data

Other data

Sensor/Measuring instrument

Sound level meterTachometer

Temperature meter

Microphone Accelerometer

Other sensor

Vibration level meter

Analysis

Application software

Supplied: Viewer software

Optional:

Waveform analysis software CAT-WAVE (The version corresponding to DA-21 is required. ) Waveform analysis software AS-70

Generic waveform processing software

(up to 2 channels)

(NOTE)

WAVE files created by the DA-21 are not supported by the DA-20PA1, DA-40 Viewer or CAT-78WR application software.

Outline

CARD

OVERLOAD

DA-21

4ch DATA RECORDER

POWER

LIGHT RECALL RANGE

CLEAR Ov

STOP PLAY REC PAUSE

CARD CAPACITY

ENT

4 Channel Data Recorder

DA-21

SD memory card

Playback signal

monitoring output

Waveform monitoring equipment

Windows Computer

(generic)

Voltmeter FFT analyzer Other equipment

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.

Menu screen

(for changing settings)

Main screen This screen appears as the  rst screen, a short

Power ON

[MENU]

or [STOP]

Recording procedure

(record data)

[REC]

Recording end

or [STOP]

Main screen

[RECALL]

Recall mode

(for processing of recorded data)

while after power to the unit is turned on. The

menu screens, recording procedure, and recall

mode are all accessed from the main screen. Input

range selection is also possible from this screen.

Menu screen Pressing the [MENU] key at the main screen brings

up a menu screen. There are a number of menu screens

that give access to recording parameters, input settings,

and various other settings (see page 30).

Recording procedure Pressing the [REC] key at the main screen initiates

the recording procedure. This encompasses all

steps required to record data (see page 94).

Recall mode Pressing the [RECALL] key at the main screen acti-

vates the recall mode. In this mode, you can check,

playback and delete recorded data (see page 108).

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Controls and Functions

Front panel

OVERLOAD

indicator

DA-21

4ch DATA RECORDER

(9) LIGHT key

(10) CLEAR Ov key

OVERLOAD

POWER

LIGHT RECALL RANGE

(12) RANGE key

(11) RECALL key

CLEAR Ov

STOP PLAY REC PAUSE

CARD CAPACITY indicator

(13) MENU key

CARD CAPACITY

ENT

Card slot cover

CARD

(1) POWER key

(2) STOP key

PLAY

indicator

(3) PLAY key

REC

indicator

(4) REC key

PAUSE

indicator

(5) PAUSE key

(6)

(8)

(7) ENT key

key

Page 18

Controls and Functions

Display panel

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 speci c function,

and some keys that perform various functions depending on the current

operating state.

(1) [POWER] key

Serves to turn the unit on and off. The key must be kept depressed for

about 2 seconds.

(2) [STOP] key

Serves to stop data recording or data playback. The key is also used for

menu operations and other functions.

(3) [PLAY] key

Serves to start data playback.

(4) [REC] key

Serves to start data recording.

(5) [PAUSE] key

Serves to pause and resume data playback.

(6) [ ]/[ ] keys

These keys serve to switch the input range, select a monitor channel, and

perform menu operations.

(7) [ENT] key

This key serves to con rm an item to be changed and accept a setting

that has been made. It is used when setting the input range, performing

menu operations, etc.

(8) [<]/[>] keys

These keys serve to change the data display format, change the  le num-

ber, perform fast reverse/forward during playback, and perform menu

operations.

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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. (The duration of this period can be

changed with a menu setting.)

Note

When the remaining battery capacity is low and the battery icon (page 23) is  ashing, the backlight does not operate.

(10) [CLEAR Ov] key

Ser ves to clear the overload history display. This display indicates if there

has been any overload condition between the point when the key was last

pressed and the current time (see page 24).

(11) [RECALL] key

Ser ves to activate the reca l l mode and to cancel the recall mode and ret u r n

to the main screen.

(12) [RANGE] key

Serves to activate and cancel the input range setting condition. In recall

mode, the key serves to delete the recording data selected by cursor.

(13) [MENU] key

Serves to bring up a menu screen or return to the main screen.

There are a number of menu screens which allow changing the settings of

the unit. Menu screens are organized by function category, such as input

settings, recording parameters, etc.

Key lock

Pressing and holding the [<] and [>] keys together for a few seconds ac-

tivates the key lock condition. In this condition, all keys except the [<]/

[>] keys and the [LIGHT] key are inactive. The condition is indicated by

a key lock icon that appears on the display (page 87).

To cancel the key lock condition, press and hold the [<] and [>] keys

together once more.

Page 20

Controls and Functions

Indicator names and functions

(1) OVERLOAD indicator

OVERLOAD

DA-21

4ch DATA RECORDER

POWER

LIGHT RECALL RANGE

CLEAR Ov

STOP PLAY REC PAUSE

(3) REC indicator

(2) PLAY indicator

(5) CARD CAPACITY indicator

CARD

CARD CAPACITY

ENT

(4) PAUSE indicator

(1) OVERLOAD indicator

Indicates that the input signal level in a channel is excessive. While the

indicator is lit, correct recording is not possible for that channel.

Lit in red: While the input signal is causing overload and for 1 second

after the overload condition ceases, the indicator is lit.

(2) PLAY indicator

Indicates that recorded data are being played back.

Flashing in green: Recorded data are being played back.

(3) REC indicator

Indicates the operating condition during data recording.

Flashing in red: Data are being recorded.

Flashing in green: Unit is in trigger standby condition.

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.

Also while the indicator is not  ashing, the currently available recording

time is shown on the display in the format “XXX:XX:XX”. Before starting

to record, you should check this indication to make sure that the intended

data can be recorded. If the remaining recording time will be about 10

seconds, recording stops.

Display example for available recording time shown on the second line

from the bottom of LCD screen (Hours : Minutes : Seconds)

Page 22

Controls and Functions

Rear panel

(8) Ext. Trig. connector

(9) Voice Input connector

(10) USB port

Voice Input

USB

DC IN 5-20V

Sync.

(1) DC IN connector

(2) Unit to Unit connector

(7) Monitor Out connector

Ext. Trig.

Monitor

Out

Tacho

Remote Controller

(4) Rotary pulse input connector

(6) Output connectors

Output

(5) Input connectors

Input

(3) Remote Controller connector

(1) DC IN connector

The optional AC adapter NC-98C or the optional car battery adapter CC-

82 can be connected here.

Important

Do not connect any AC adapter or car battery adapter except for the speci ed models. Otherwise the unit may be damaged.

The optional car battery adapter is only for use in cars with a 12-V electrical system. If the adapter is used in a car with a 24-V electrical system to su p ply power to the DC IN connector of the unit, the unit will be damaged.

When c o nnecting an exter nal 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.

(7) Monitor Out connector

The input signal or playback signal of the channel selected for monitor

operation is output from this connector.

(8) Ext. Trig. connector

Accepts an external trigger signal.

(9) Voice Input connector

Serves to connect the optional microphone for the voice memo function.

(10) USB port

Serves for connection to a computer.

Page 24

Controls and Functions

Right side panel

Card slot cover

CARD CAPACITY

Card slot

Card slot cover

Open this cover to access the SD memory card slot.

Card slot

The SD memory card is inserted here. The card allows storing data and

exporting data to a computer. The card slot is also used for upgrading

the system  rmware etc.

Note

Use only RION supplie d SD memory ca rds cer ti ed for operation in the 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  les is inserted in the DA-21, the unit may take some time to recognize the card.

Page 25

Bottom panel

Battery compartment

Accepts four alkaline batteries (IEC LR6 [size AA]).

Menu lock mode (see page 88):

When the [MENU] switch inside the battery compartment is set to “LOCK”, changing settings and deleting data via the menus is not possible.

Controls and Functions

Battery compartment

Wake-up-on-power mode (see page 60):

When the [WAKE UP ON POWER] switch inside the battery compartment 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.

Important

Take care not to reverse the (+) and (-) polarity when inserting the batteries (see page 57).

When using the wake-up-on-power mode, there should be no batteries inserted in the unit.

Remove the batteries from the unit if it is to be stored for a long time with the [POWER] key set to OFF to prevent possible damage caused by battery leakage.

Note

Before changing the position of these switches, disconnect any external power that is being supplied to the DC IN connector and remove all batteries from the battery compartment. Otherwise operation of the unit will become unstable. If this has happened (not a defect of the unit), disconnect the external power, remove all batteries, after a few seconds, reconnect the power and turn the unit on.

Page 26

Power On/Off

Turning the power on

When you keep the [POWER] key depressed, the startup screen as shown below appears on the display. After a while, the main screen will be shown. If there is a setting  le on the SD memory card, the main screen does not appear straight away. Instead, a message screen is shown asking whether you want to load the settings from the card, or use the settings that were established before power was last turned off.

POWER

Setting  le found

Message screen

ENT

Contents of setting  le are loaded.

DATA RECORDER

DA-21

RION CO., Ltd.

Startup screen

No setting  le found

PAUSE

Settings that were active before power was last turned off are established again.

Main screen

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  le are loaded at power-on, a channel selected for CCLD will be suppl ied with constant cu r rent. To prevent problems due to unsuitable connections, it is recommended to disconnect sensors before loading a setting  le.

Turning the power off

When you keep the [POWER] key depressed, the shutdown screen as shown

below appears on the display, and the unit is turned off.

Shutdown screen

Note that if a

icon is shown at the bottom of the display, the operation

keys including the [POWER] key are locked. The power cannot be turned

off in this condition. (For information on the key lock feature, see page 87.)

Indicates the key lock condition

Note

After turning the unit off, do not turn the unit on again immediately. Wait at least a few seconds.

In ca se key lo ck i s act ivated, pressi ng and holding [POWER] key for 10 seconds or more will turn the unit off.

Page 28

Power On/Off

About the setting  le

You can store all setting values and parameters of the unit on the SD memory

card as a setting  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.

This reduces the time required for startup and the risk of making setup errors.

To create a setting  le, use the “Read / Save Settings” item on <System>

menu. (see page 51)

Note

Page 29

Display Explanation

Display screen

Recording/operation mode indication (page 20)

Recording parameter indication (page 18)

Channel data (page 24)

Trigger setting indication (page 21)

Status indication (page 22)

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.

(1) Frequency range [Sampling frequency]

Shows the setting made with <Rec.Parameters> menu, items “Frequency

Range” and “Sampling Frequency”. The relationship between frequency

range and sampling frequency is as shown in the table below.

Frequency range

(2) Elapsed recording time

Sampling frequency

[×2.56] [×2.4]

(3) Recording time

(4) Synchronization

information

100 Hz 256 Hz 240 Hz

500 Hz 1.28 kHz 1.2 kHz

1 kHz 2.56kHz 2.4 kHz

5 kHz 12.8 kHz 12 kHz

10 kHz 25.6 kHz 24 kHz

20 kHz 51.2 kHz 48 kHz

(2) Elapsed recording time (Format: “0000:00:00”)

In recording mode, the elapsed time since the start of recording (including

pre-recording time) is displayed. The recording time indication is retained

until a new recording is started.

Page 31

Display Explanation

(3) Recording time (Format: “/ xx s [m, h]” or “/ Man”)

Shows the setting made with <Rec.Parameters> menu, item “Recording

Time”. When the manual setting has been selected, the indication shows

“/ Man”.

When the [STOP] key is pressed or the SD memory card runs out of

space, recording stops. In this case, the actual recorded data time will be

shorter than the recording time setting. (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  eld shows recording and operation status information as well as

all-channel overload information.

(2) All-channel overload indication

(1) Recording/operation mode indication

An icon indicates the current recording condition.

None Normal condition

Playback in progress (recall mode only),  ashing

Recording in progress,  ashing

Trigger standby, permanently on

Playback paused,  ashing

Rewind (recall mode only),  ashing

Fast-forward (recall mode only),  ashing

(2) All-channel overload indication

This indication appears if there has been an overload condition in any

channel. There are two types of indications, for instantaneous overload

and overload history. The display method is the same as explained in

the section on overload information (page 24).

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)

“Single/Level” Single level trigger

“Repeat/Level” Repeat level trigger

“Single/Time” Single time trigger

“Repeat/Time” Repeat time trigger

“Single/Ext” Single external trigger

“Repeat/Ext” Repeat external trigger

“Single/Ext-Gate” Single external gate trigger

“Repeat/Ext-Gate” Repeat external gate trigger

“Master” Master trigger

When a level trigger has been set, information about the trigger channel

and trigger level is shown in the channel data area. For details on the

channel data area, see the section starting on page 24.

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-

ing recording time as calculated from the currently selected sampling

frequency and number of active channels.

When no card is inserted, the card icon and remaining capacity indication

are not shown, and the remaining recording time indication shows “---:--:--”.

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. The number of black segments

decreases as the batteries get depleted. When the indication starts

to  ash, replace the batteries with a fresh set.

Maximum

capacity

Low battery

Flashing (replace batteries)

: Indicates the key lock condition where the operation keys except

for [LIGHT], [<], and [>] are disabled. (For details on the key lock

function, see page 86.)

The condition is activated by pressing and holding the [<] and [>]

keys together for a few seconds. Repeating the procedure cancels

key lock and causes the icon to disappear.

The keys on the Remote Controller are not affected by the key

lock function.

: Indicates the menu lock condition where the menus cannot be

used. (For details on the menu lock function, see page 88.)

: Indicates the display backlight has been lit up.

(3) Clock

Shows the current date and time, using 24-hour format.

* Backlight cannot be used.

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

(1) Level trigger target channel

(2) Channel number/ overload information

(3) Bar graph

(1) Level trigger target channel

When the level trigger function is used, the indication “TRG” is shown

to the left of the channel indication.

(2) Channel number/overload information

The channel number (CH1 to CH4) is shown here. If an overload signal

(5) Monitor icon

(6) Range full-scale value

is input, the channel number switches to the overload information.

There are two types of overload indications: instantaneous overload and

overload history.

OVER

Shown when instantaneous overload has occurred.

Shown when overload has occurred at least once during

OVER

recording (overload history).

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)

• Recording start

• When recall mode is canceled

(3) Bar graph

Shows the magnitude of the input signal, using one of the following three

methods:

• Linear value display

This is used when “Linear” has b een selecte d in the <Ba r Graph > menu

(see page 50). If the sensor type for the channel has been set to “SLM/

VM” in the <I N PUT> menu (see page 39), this mode cannot be selecte d.

• Logarithmic value display (bar graph covers about 80 dB)

This is used when “L og” ha s been selected in the <Bar Graph> menu.

If the sensor type for the channel has been set to “SLM/VM”, this

mode cannot be selected.

• dB value display (bar graph covers about 80 dB)

When the sensor type for the channel has been set to “SLM/VM”, this

mode is always used, regardless of the <Bar Graph> menu setting.

• Channel OFF

This indication is shown when the respective channel is set to OFF.

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

The icon is shown to the right of the bar graph for the channel selected

for monitor output.

The monitor channel can be changed using the [ ]/[ ] keys.

(6) Range full-scale value

Depending on the “Sens” and “Sensitivity” settings in the <Input> menu,

the value corresponding to the bar graph full range point is shown here.

A list of the menu settings and values/units is shown in the table below.

<Input> menu

Numeric range (number of digits) Unit

“Sens” setting

V 0.01, 0.03, 0.1, 0.3, 1, 3, 10 “V”

EU 9.99E ± 99 “V/EU”

MIC -0.1 to -99.9 (5 digits, 0.1 dB step) “dB”

PICK 9.99E ± 99 (8 digits) “mV/(m/s

SLM 40 to 140 (3 digits, 10 dB step) “dB”

VM 40 to 140 (3 digits, 10 dB step) “dB”

For information on changing the input range setting, see page 70.

)

Page 39

Display Explanation

CH5 data

The CH5  eld either shows tachometer signal information or information

about the use of the voice memo and marker function.

(1) Channel number / overload information

(1) Channel number/overload information

The channel number (CH5) is shown here. If an overload signal is input,

the channel number switches to the overload information (see page 24).

(2) Bar graph and setting information

Depending on the setting made for “CH5” in the <Input> menu (see page

39), the display is switched as follows.

“OFF” setting

•

“OFF” is shown in the bar graph area.

(2) Bar graph and setting information

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.

• Above the upper limit of 630,000 rpm, the invalid indication “---”

is shown.

Underload signal evaluation

• “Under” is shown when revolution speed is 200 rpm or lower.

• Under the lower limit of 190 rpm, the invalid indication “---” is

shown.

“Voice Memo” setting

•

The level of the voice memo input is shown in the bar graph area.

“Marker” setting

•

“OFF” is shown in the bar graph area, and the icon  ashes when the

marker function is used.

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.

The horizontal axis is the time (up to 20 seconds before), and the vertical

axis is the level. Also during history display, you can switch the monitor

channel with the [

]/[ ] keys.

(2) Time-level graph

(1) Channel information

From left, the display shows the voice memo, tacho, or marker icon (when

channel 5 is used), the channel number, and range full-scale.

(2) Time-level graph

The time-level graph shows a history graph for waveform data of the last

20 seconds in the monitor channel.

The graph is based on the approximate absolute (not the root mean

square) values of the input waveform.

Page 42

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.

There are a total of six menu pages, divided by category such as input related

settings, recording settings etc. A detailed description of menu operation

steps follows.

1. Call up the menu list

Press the [MENU] key. The menu list appears.

2. Select a menu page

Use the [ ]/[ ] keys to move the cursor to the desired menu page.

ENT

Page 43

3. Open the menu page

Press the [ENT] key. The items on the selected menu page appear.

ENT

4. Select an item

Menu Operations and Setting Items

Use the [

]/[ ] /[<]/[>] keys to move the cursor to the desired

setting item.

ENT

5. Initiate the change

Press the [ENT] key to start changing the selected item.

There are three ways of changing a setting, as follows.

ENT

A : Select setting item on sub menu

B : Change setting value on sub menu

C : Execute (process) selected item

Page 44

Menu Operations and Setting Items

6. Detailed explanation of methods A, B, C

A: Select setting item on 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.

<Input> (Sensor signal type, High pass  lter, Low pass  lter,

<Rec.Parameters>

Sub menu

Sensor type)

(Frequency Range, Sampling Frequency, etc.)

<Trigger> (Trigger Mode, Trigger Type, etc.)

<Bar Graph> Bar Graph Display Type

<System> (Play Signal Output, Backlight Brightness, etc.)

(Master or slave selection)

The explanation below uses the channel 3 LPF setting on the <Input>

menu as an example. The procedure is the same for other items.

A-1 Use the [

]/[ ] keys to move the cursor in the sub menu to

the desired setting.

ENT

Select setting

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

ENT

has changed to 200 Hz

Con 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. In this case, the indication is as shown below.

STOP

Cancel the sub menu operation

Setting remains OFF

Page 46

Menu Operations and Setting Items

B: Change setting value on 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> (Sensitivity)

<Rec.Parameters>

Sub menu

(Recording time, Pre-recording time)

<Trigger> (Trigger level, Recording start time, Recording

stop time)

<System> (Device index number, clock setting)

The explanation below uses the CH2 Sensitivity setting on the <In-

put> menu as an example. T he pro cedure is the same for other items.

B-1 Use the [

]/[ ] keys to change the value or unit of the item

in the sub menu. Holding down a key causes a faster change.

ENT

Change setting value

Page 47

Menu Operations and Setting Items

B-2 Press the [ENT] key. The change is accepted and the sub menu

disappears.

Sensitivity set-

ENT

ting has changed to 130 dB from 100 d B

Con 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. In this case, the indication is as shown below.

STOP

Cancel the sub menu operation

Setting remains 100 d B

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”. When the process is completed,

the original menu page appears again.

Execution choice example

This concludes the description of the three ways of changing a menu

setting.

Page 49

7. Changing an item on another menu page

Press the [MENU] key to bring up the menu list.

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 Operations and Setting Items

STOP

Return to main screen

Page 50

Menu Operations and Setting Items

Menu  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.

Menu screen

Menu list

STOP

ENT

Confirm change

ENT

Cancel

STOP

Menu pages

Only one menu page can be used at a time. To go to another menu page, return to the menu list first.

ENT

PAUSE

Cancel

Execute

ENT

Main screen

ENT

Sub menu

Execute(process)item

[Processing message]

Setting changed /processing completed

Page 51

Menu Items

Setting items are organized in six pages, with related items appearing together

on one page. The contents of each menu page are described below.

<Input> menu

Allows you to select the sensor (signal) type, input signal  ltering, sensor

sensitivity level and units for each channel.

Menu Operations and Setting Items

Inp Sensor (signal) type setting (CH1 to CH4)

Controls the input on/off setting and sensor (signal) type.

OFF Select this setting when the input is not to be used.

DC This setting is for input of an electrical signal, with the re-

cording to include DC components. This is suitable for en-

vironment sensors (temperature, wind speed, pressure, etc.)

and sound level meters that output the measurement value as

a DC signal. The setting should also be used when recording

a signal (such as from a vibration level meter) that comprises

frequency components below 1 Hz.

AC This setting is for input of a normal electrical signal, with

the recording to exclude DC components. This is suitable for

sound level meters, vibration meters and similar equipment

that outputs the measurement value as an AC signal. The cutoff

frequency is about 0.3 Hz.

Note

When Input is set to AC, a high-pass  lter with a cutoff frequency of 0.3 Hz is applied. However, if the input signal contains h igh-level DC components t hat 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. When quitting the menu, if battery capacity is too low for supporting CCLD operation, the unit will switch itself off automatically. In such a case, replace all batteries with fresh ones, or connect an AC adapter or other external power supply.

VP4x Select this setting when the accelerometer is connected to the

unit via the charge converter VP-40 etc. (see page 63).

Inp Tachometer signal, voice memo, marker setting (CH5)

This setting determines which signal type information is shown in the

CH5 area during recording.

OFF Select this setting if no signal assigned to CH5 is input.

Tacho Select this setting if a rotary pulse signal (tacho signal) is

supplied to the rotary pulse input connector.

Voice Mem o

Select this setting if the optional voice memo microphone is

connected to the Voice Input connector and used for recording

voice memos.

Marker Select this setting if the switch of the connected voice memo

microphone is used for the marker function.

Voice memo recording is possible at the main screen, except when the

setting is “OFF”.

Page 53

Menu Operations and Setting Items

HPF High-pass  lter frequency setting

Enables a high-pass  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  lter.

OFF / 5 Hz

LPF Low-pass  lter frequency setting

Enables a low-pass  lter for the input signal. The LPF frequency indicates

the cutoff frequency.

Available settings are OFF, 200 Hz, 1 kHz, and 2 kHz, but only selections

that are within the frequency range setting are allowed.

OFF / 200 Hz / 1 kHz / 2 kHz

Available parameter list

Frequency range

LPF

200 Hz

1 kHz

2 kHz

100 Hz 500 Hz 1 kHz 5 kHz 10 kHz 20 kHz

× ×× ×××

• • • Available × • • • Not available

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.

Inp

setting

Available Sensor settings (depending on Inp) and description

Sens Description

OFF No setting available

Record input voltage from sensor or measuring instrument as is.

Convert input voltage from sensor or measuring instrument into EU for recording.

AC/DC

SLM

Sound level meter (with AC or DC output) is connected.

Vibration level meter (with AC or DC output) is connected.

Constant Current Line Drive compatible sensor is connected. Record input voltage from sensor as is.

Constant Current Line Drive compatible sensor is

CCLD

MIC

connected. Convert input voltage from sensor into EU for recording.

Constant Current Line Drive compatible microphone is connected.

PICK Accelerometer with built-in preampli er is connected.

VP4x PICK

Accelerometer via charge converter VP-40 etc. is connected.

EU (Engineering Units) is a unit symbol for expressing various physical

quantities detected by a sensor.

Page 55

Menu Operations and Setting Items

Sensitivity Unit conversion value setting

Speci 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)

VNo setting

Voltage per EU (V/EU)

(Note that the EU setting value is the inverse of that used in the DA-20.)

MIC

PICK (CCLD)

PICK (VP4x) Charge sensitivity of accelerometer [pC/(m/s

Constant Current Line Drive compatible microphone sensitivity level (dB)

Voltage sensitivity of accelerometer with built-in pream-

pli er [mV/(m/s

)]

SLM Sound level meter level range (dB)

VM Vibration level meter level range (dB)

For additional information on the Inp, Sens, and Sensitivity settings, see also

pages 65 to 69.

Page 56

Menu Operations and Setting Items

<Rec.Parameters> menu

This menu comprises settings for recording and auxiliary functions.

Frequency Range Frequency range setting

The value selected as the frequency range setting represents the highest

effective frequency that can be included in the recorded data.

Available settings are 100 Hz, 500 Hz, 1 kHz, 5 kHz, 10 kHz, and 20 kHz.

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.

×2.4 / ×2.56

Bit Length Bit length setting

Select the recording data bit length. Increased accuracy of analysis and

better sound quality can be obtained as the value increased.

Available settings are 16 bit and 24 bit.

16 bit / 24 bit

Wave Splitting Interval Set splitting interval for recording data

The setting determines the size of a single  le when recording data in

channels 1 to 4. Available settings are 10 minutes and 1 hour.

10 min / 1 h

Note

Rotary speed data and voice memo data recorded in channel 5 are not split.

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. With the Manual setting, recording will automatically stop

after 1000 hours have elapsed. A recording time that is longer than that

available with the inserted SD memory card cannot be set.

The sub menu moves in the following order for the recording time (1 to

59 / 1 to 24 / Manual) and the unit (s, m, h).

When data for the preset recording time have been collected, recording

stops automatically. However, if the [STOP] key is pressed before that,

or if the SD memory card becomes full, recording stops at that point.

1 s to 59 s (seconds) / 1 m to 59 m (minutes) / 1 h to 24 h (hours) / Manual

Pre Recording Time Pre-recording time setting

When recording is started by pressing the [REC] key or by a trigger event,

the pre-recording function allows data from a range before the actual start

point to be included in the recording. The Pre Recording Time value de-

termines the duration of the range for such data. Available settings are 0

s, 1 s, and 5 s (seconds). To disable the function, select the “0 s” setting.

For more information, refer also to page 76.

0 s / 1 s / 5 s

Note

After changing the frequency range or channel setting, the [REC] key will be inactive for the Pre Recording Time interval, and recording cannot be started during this interval.

Page 58

Menu Operations and Setting Items

<Trigger > menu

Comprises trigger related items (see pages 77 to 83).

Mode Trigger operation mode setting

Determines the basic operation when a trigger event occurs. If trigger

operation is not required, choose the “Free” setting.

Free Trigger is not active. Recording starts immediately when the

[REC] key is pressed.

Single The unit goes into trigger standby mode when the [REC] key

is pressed. When a trigger event occurs, recording starts. When

the amount of data corresponding to the recording time has

been recorded, recording stops.

Repeat The unit goes into trigger standby mode when the [REC] key

is pressed. When a trigger event occurs, recording starts. When

the amount of data corresponding to the recording time has

been recorded, the unit again goes into trigger standby mode.

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 speci ed channel (trigger channel)

becomes a preset value (trigger level) or higher.

External

A trigger event occurs and recording is started when the Ext.

Trig. connector is shorted.

External Gate

Recording is carried out only while the Ext. Trig. connector is

shorted (gate trigger operation). When the Ext. Trig. connec-

tor goes open, recording will stop after a delay of 5 seconds

(post-recording).

Time Recording is carried out from the speci ed Start Time to the

speci ed Stop Time, at intervals as speci ed by the Interval

setting.

Level Trigger level setting

When the trigger signal type is “Level”, a trigger event occurs when the

absolute value of the input signal waveform exceeds the trigger level. The

trigger level is a threshold set as a relative percentage [%] correlated to

the full-scale value of the input range setting that is active at the time of

recording.

Consequently, the actual trigger level (input signal waveform value) will

change when the input range setting is changed.

The trigger level is indicated on the bar graph for the trigger channel (see

page 26).

Ch Trigger channel setting

When the trigger signal type is “Level”, a channel (1 to 4) must be spec-

i ed for monitoring. This is called the trigger channel.

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”. When the stop time setting

is before the current time, the setting automatically becomes “Start Time

+ 24 hours”.

Interval Recording interval setting

When the trigger signal type has been set to “Time” and the trigger mode

to “Repeat”, the recording interval can be set here. The following settings

are available.

5 m / 10 m / 15 m / 30 m / 1 h / 8 h / 24 h

Note

The interval setting must be longer than the “Recording Time” as set in <Rec.Parameters> menu.

Page 61

Menu Operations and Setting Items

Sleep Sleep function setting

When the trigger signal type is set to “Time”, this setting controls the use

of sleep mode during recording.

OFF/ON

When sleep mode is ON, the unit goes into the power save state about 60

seconds after standby was activated by pressing the [REC] key. When

Mode is set to “Repeat”, the unit will enter the power save state also

between recording intervals.

In the power save state, the LCD screen is off.

About 90 seconds before recording start, the unit wakes up and goes into

standby until the actual start.

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.

Recording start

REC

Sleep

(low power

consumption)

sec.

Operation example for sleep mode

DA-21 settings Mode: Repeat Start Time: 2014/01/15 12:00 Stop Time : 2014/01/15 15:00 Interval: 1h (1 hour) Recording Time: 10m (10 minutes)

12:00 13:00 14:00 15:00

sec.

Data recording

10 min.

Sleep

(low power

consumption)

sec.

1 hour 1 hour

sec.

Data recording

10 min.

sec.

Sleep

(low power

consumption)

sec.

After completion of recording, the unit does not go into the power save state.

Data recording

10 min.

Page 62

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 “Sensitivity” has been set to MIC, SLM, or VM with <Input> menu. The bar graph indication for such channels is  xed to dB.

Page 63

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. In the

<Read / Save Setting> menu, select “Load Default Settings” and press

the [ENT] key. The execution choice screen appears.

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 identi ed as No. 1 to No. 5 can be saved. In

the <Read / Save Setting> menu, select No. 1 to No. 5 for “Internal

Memory” and press the [ENT] key. A screen to save or read settings

appears. Use the [

]/[ ] keys to select the desired action and press

the [ENT] key. The execution choice screen appears.

SD CARD

The input range and other settings made with the menus can be saved on

an SD memory card for later use. Only one set of settings can be saved.

The steps for saving and reading are the same as for “Internal Memory”

described above. The setting  le saved on the SD memory ca rd can also

be used as st a rt up  le for loading when the unit is turned on (see page 14).

If the message “Card Error.” appears when you press the [ENT] key to

update the setting  le, the SD memory card may be defective.

Important

Changes to settings made with the menus will be saved on the SD memory card by the “Save Settings” function, but for the unit, the settings will only be activated at the point where you return to the main screen. If you turn the power off before returning to the main screen, the changed settings will not be active the next time you turn the unit on.

Note

When a setting  le is loaded which contains a CCLD setting for the Inp item of <Input> menu, the channels for which CCLD is selected will be supplied with a constant current. If the unit is operated on battery power and the remaining capacity of the batteries is low, a forced power-down will occur when a CCLD setting is selected (see page 40).

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.

Backlight Settings Backlight brightness and auto off time

setting

Brightness

Select the grade of backlight brightness from the number of 1 to 4.

Auto-Off

When no key is operated for the period set here, the backlight will be

automatically turned off. Available settings are 30 s (seconds), 3 m

(minutes), and Continue. To have the backlight continuously on, select

Continue.

Battery Type Used battery type setting

Displays the sub menu to select the type of battery used for the unit. The

remaining battery capacity corresponding to the selected battery is dis-

played on the main screen. Available settings are Alkaline and Ni-MH

(nickel-metal hyd r ide).

Alkaline / Ni-MH

Card Format SD card formatting

Formats the inserted SD memory card.

Select “Card Format” and press the [ENT] key. The execution choice

screen appears.

USB Storage Function setting for connection to computer

When set to “ON”, connecting the unit to a computer via USB will cause

the SD memory card inserted in the unit to be recognized as a removable

disk. Data recording and data recall operation cannot be performed when

the state of “USB Storage” is set to “ON”.

Page 66

Menu Operations and Setting Items

Monitor Out Function setting for Monitor Out connector

When set to “ON”, a playback signal for the monitor channel is output

from the Monitor Out connector.

For details about playback, refer to the section beginning on page 111.

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.

The index number setting has no in uence on performance or functions

of the unit.

Version Version information

Displays the  rmware version of the unit.

Page 67

Menu Operations and Setting Items

<Synchronization> menu

Contains settings for operating two connected DA-21 units as a synchronized

system.

For additional information on DA-21 synchronized operation, also refer to

page 91.

Master / Slave Assign unit to master or slave operation

After connecting two DA-21 units, this setting determines whether the

respective DA-21 unit operates as master or as slave.

OFF No synchronized operation.

Master Select this setting on the DA-21 to be used as master.

Slave Select this setting on the DA-21 to be used as slave.

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. Two connected DA-21 units synchronize.

Important

Establish the same settings on both DA-21 units (<Rec.Parameters> menu items). If settings are different, synchronized operation is not possible. Also, when the settings are changed after the synchronization, it is necessary to synchronize again.

Check the synchronization information on the display (page 18) after operation of the synchronization.

Page 68

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. Sensitivity setting

Recording parameter settings

1. Input range, overload

2. Frequency range, sampling frequency

3. Recording time, trigger

Auxiliary function setup

1. Device index number

2. Voice memo/marker

3. Preventing inadvertent operation

4. Remote control operation

5. Connection to a computer

6. Inter-unit synchronization

7. Tachometer signal input

Page 69

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 speci ed AC adapter available as an option for the DA-21.

Inserting the batteries

1. Open the battery compartment cover.

2. Insert four IEC LR6 (size AA) batteries with correct polarity, as

shown inside the compartment.

3. Replace the battery compartment cover.

Important

Take care not to reverse the (+) and (-) polarity when inserting the batteries. Always replace all four batteries together. Do not mix old and new batteries or batteries of different type. Remove the batteries from the unit if the unit is not to be used for an extended period.

Note

If the unit is operated on battery power, take the following points into account when using a CCLD type sensor. When quitting the menu after setting the “Inp” item of <Input> menu to CCLD, the unit may switch itself off automatically. In such a case, replace all batteries with fresh ones.

Page 70

Preparations

Connecting the power cord and AC adapter (option)

Connect the AC adapter as shown below. Turn the unit off before making

this connection.

1. Plug one end of the power cord into the small socket on the AC

adapter.

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. Trig.

Input

DC IN connector

USB

DC IN 5-20V

Sync.

Remote Controller

Monitor

Out

Tacho

Output

Input

AC adapter NC-98C (option)

To AC outlet, 100 V to 240 V, 50 Hz / 60 Hz

Important

Use only the speci ed AC adapter available as an option for the DA-21. Using another kind of AC adapter may lead to damage and malfunction. When connecting a battery or purpose-built cable to the DC-IN connector, take great care to ensure correct polarity and voltage.

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.

A full charge of the backup battery is achieved after 24 hours.

Charging time Retention period

1 hour 2 days

12 hours 30 days

24 hours 45 days

Use the AC adapter when connecting external power for battery charge while

the unit is turned off. The service life of the backup battery is limited. You

should have the battery replaced about once every  ve years. Please contact

your supplier.

Note

The charging time, retention period and service life of the backup battery may vary depending on the operating condition.

When the backup battery is old, the retention period will be shorter.

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. In such a case, the [POWER] key on the panel has

no effect.

WAKE UP

ON POWER

Power is controlled by external power supply

OFF

Power is controlled by [POWER] key

Important

When setting the [WAKE UP ON POWER] switch to ON, remove all batteries from the battery compartment. Otherwise the wake-up-on-power mode will not operate normally.

Remove the batteries from the unit if it is to be stored for a long time with the [POWER] key set to OFF to prevent possible damage caused by battery leakage.

Page 73

SD memory card preparations

Recorde d data are saved on SD memory cards in WAVE  le format. To enable

storing of recorded data  les on an SD memory card, a special data manage-

ment  le and directory structure particular to the 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  le are automatically created.

An SD memory card inserted in the unit will be recognized as a removable

disk by the computer when the “USB Storage” item of <System> menu is set

to “ON”, without having to install a USB driver.

For connection to the DA-21 and the computer, use an optional (generic) A

- mini B USB cable.

SD memory cards even from the same manufacturer and of the same type exhibit certain variations in specifications which may cause problems. For this reason, be sure to use only the SD memory cards provided by Rion. The performance of other cards is not guaranteed.

Preparations

Important

This unit supports SD memory cards and SDH C memory cards, but not SDXC memory cards.

Format the SD memory card by the DA-21 before recording.

If folders or  les on the SD memory card have been altered by other equipment except the DA21, do not continue to use the card for recording in the DA-21. Data may not be recorded correctly.

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.

Note that we assume no responsibility for any damage or loss of stored measurement data.

1. Open the card slot cover of the unit.

2. Insert the SD memory card into the card slot with the label of the

card facing up. Push the card in until it is locked in place.

3. To remove the card, push the card a bit further in, the card is released

and pops out of the card slot.

CARD CAPACITY

Slide card slot cover out

Raise card slot cover

CARD CAPACITY

Label side should face up

SD memory card

By sliding this switch in the arrow direction, you can write-protect the card

Page 75

Formatting an SD memory card

Note

When a n SD memory ca rd is format ted (i n itia l i zed), all data present on the card will be lost. But the setting  le will remain if the card is formatted by this unit.

In the following cases, you should format the SD memory card:

• When using the SD memory card in the unit for the  rst time

• When wishing to delete all data from the SD memory card

To format an SD memory card, proceed as follows.

1. Select “Card Format” on the <System> menu and press the [ENT]

key.

Preparations

2. The execution choice screen appears. Press the [ENT] key.

Page 76

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. Some possible combinations are shown below.

Measuring device with AC or DC outlet

Temperature meter

Tachometer

Other device

VM-83

VIBRATION METER

LEVEL RANGE

Vibration meter

Vibration level meter

(VM-83, VM-53 or similar)

PICKUP

HPF LPF

ACC/VEL

/DISP

HPF LPF MENU

MAXHOLD

ON/OFF

LIGHT

CAL

RHS

PICKUP

PEAK

/EQ

SENS

P-P

/EQ

POWER

COMP

HOLD

ON/OFF

RESET

BNC-BNC cable

Sound level meter

(NL or NA series)

Piezoelectric accelerometer

(with built-in preamplifier)

PV-41, PV-91C etc.

Piezoelectric accelerometer

PV-85, PV-90B etc.

Accelerometer

Piezoelectric accelerometer

PV-97 etc.

Microphone

UC-59, UC-52

cable

To AC

OUT

Charge converter

VP-42

Charge converter

Tri-axial accelerometer

cable VP-51WL

BNC-mini plug cable

CC-24S

CC-24 can also be used

Preamplifier

BNC-BNC cable

NH-22

BNC adapter

VP-52C (option)

VP-51 series or cable

supplied with accelerometer

BNC adapter

VP-52C (option)

Accelerometer

cable

VP-40

VP-40 90001 RION

Charge converter

VP-40

VP-40 90001 RION

To input connectors

DA-21

Page 77

Input settings

The four signal input connectors (BNC connectors) can not only accept a

signal, they also allow output of a constant current to a CCLD (Constant Cur-

rent Line Drive) type sensor. Some CCLD sensors use a basic preampli er +

accelerometer or microphone con guration. The DA-21 can record up to four

input signals. The input connectors 1 to 4 are assigned to channels 1 to 4.

Input setting (<Input> menu: Inp)

The setting is made for each channel separately, with the “Inp” item on

<Input> menu.

AC For sensors that output an electrical signal without DC com-

ponents

DC components and components 0.3 Hz or below are blocked.

Preparations

Example: AC output of sound level meter or vibration

meter

DC For sensors that output an electrical signal including DC

Example: Temperature meter or tachometer output, DC

output of sound level meter

CCLD For sensors requiring a constant current source

For such sensors, a constant current is supplied via the input

connectors of the DA-21.

Example 1: Combination of microphone UC-52 or UC-59

or similar with preampli er NH-22 (CCLD: 2

mA) or similar

Example 2: Piezoelectric accelerometer with built-in pre-

ampli er PV-41, PV-91C, PV-97I (3-axis) or

similar

VP4x Sensor connected via the charge converter VP-40

Example: Accelerometer PV-85 or PV-90B etc. connected

via the charge converter VP-40

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

” in the table below. EU (Engineering Units) is a unit symbol for

a “

expressing various physical quantities detected by a sensor.

Sens

Inp

CCLC

VP4x

When the “Sens” item is set, the sensor signal units are determined au-

tomatically, as shown in the table below.

Indication for Sensor

item in

EU EU V/EU

VEUMICPICKSLMVM

××

××× ××

Unit as

shown on

main screen

Scaled unit set

for Sensitivity

item in menu

Value input for Sensitivity

Set voltage corresponding to 1 EU

MIC dB dB

PICK

(CCLD)

PICK

(VP4x)

SLM dB dB

VM dB dB

m/s

mV/(m /s2)

pC/(m/s2)

Set microphone sensitivity level (dB re. 1 V/Pa)

Set sensitivity of accelerometer (with built-in preampli er)

Set charge sensitivity of accelerometer

Set sound level meter level range (full-scale value)

Set vibration level meter (VM-53 or similar) level range (full-scale value)

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/s2), the

setting should be “0.44”.

dB Set the microphone sensitivity level (dB re. 1 V/Pa), or

level range (full-scale value) of sound level meter or

vibration level meter.

Microphone

Example: For UC-53A rated for -28 dB and used

together with NH-22, the transmission

loss is taken as -0.8 dB and the setting

should therefore be “-28.8”.

Sound level meter

Set to full-scale value of level range

Example: 80 dB

Vibration level meter

Set to full-scale value of level range

Example: 80 dB

EU Set how many volts of the sensor signal voltage corre-

spond to one unit of the physical quantity.

Example: For a tachometer rated for 1 V/1000 rpm,

the setting should be “1.00E-03”.

Page 80

Preparations

The table below shows the correlation formula for the original input range

X [V] and the condition after the sensitivity setting.

Unit

Sensitivity

value

Inp (Sens) type Input range value after conversion

[V] None DC/AC(---) X[V]

[EU] K[V/EU] DC/AC(EU) X/K

[dB] S[dBV/Pa] MIC(CCLD) 94-S-3+20 log

V[mV/(m/s

]

[m/s

V[pC/(m/s

[dB] R[dB] SLM/VM 20 log

* Take the charge sensitivity [pC/(m/s

)] PICK(CCLD)

)]*PICK(VP4x)

1/(V/1000)×X

10(X )+R-10

)] given in the calibration certificate

10(X )

of the accelerometer and enter it as voltage sensitivity [mV/(m/s2)].

Some practical examples for applying the respective formula to actual

sensitivity values are shown below. These values are shown as input range.

(When the exponent is two digits, the mantissa is shown as one digit.

The effective number of digits for dB is three. In 3-V systems,

used instead of 3 for calculation. This is because the 3-V range actually

is 3.16 V = 10.)

Sensor Sensitivity Unit Actually displayed input range value

General 1 V 10V 3V 1V 0.3V 0.1V 0.03V 0.01V

Tach ome ter K=1.0E-03 EU 1.00 E+4 3.16E+3 1.0 0E+3 3.16E+2 1.00E+2 3.16E+1 1.0 0E+1

UC-59 S =-28.8 dB 139.8dB 129.8dB 119.8dB 109.8dB 99.8dB 89.8dB 79.8dB

PV-90I V=0.44 m/s22.27E+4 7.19E+3 2.27E+3 7.19E+2 2.27E+2 7.19E+1 2.27E+1

SLM R=80dB dB 90 80 70 60 50 40 30

Page 81

Preparations

Input settings and sensitivity settings for some representative sensors are

shown below for reference. The sensitivity value differs for each sensor.

Sensor example Inp Sens Sensitivity

DC output of general measuring

device or sensor, or AC output of

vibration meter

AC output of general measuring

device, sensor, vibration meter,

sound level meter

Microphone: UC-52

Preampli er: NH-22

Piezoelectric accelerometer

(with built-in ampli er):PV-90I

Piezoelectric accelerometer: PV-85

Charge converter: VP-40

Sound level meter NL series AC SLM

Vibration level meter:VM-53 AC/DC VM

CCLD MIC

CCLD PICK

VP4x PICK

When Inp is set to AC, a high-pass  lter with a cutoff frequency of 0.3 Hz is applied. However, if t he input signal contains h igh-level DC components that exce ed the input range, overload may occur in the DA-21.

Sensor sensitivity

unit

----- No setting 1

EU X.XXE+XX V/EU

----- No setting 1

EU X.XXE+XX V/EU

Sensitivity level

(-0.1 to -99.9)

Voltage sensitivity

(0.01 to 99.9)

Charge sensitivity

(0.01 to 99.9)

Voltage sensitivity

(40 to 140)

Voltage sensitivity

(40 to 140)

(0 dB=1 V/Pa)

mV/(m /s2)

pC/(m/s2)

Note

Page 82

Preparations

Recording parameter settings

This section describes how to set the parameters for recording data. Input

range, frequency range, sampling frequency, and recording time are required

items. If necessary, you should also set the Pre Recording Time, trigger, and

other related items.

Input range setting

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. For inspection of products and oth-

er kinds of periodic measurements, it may be necessary to keep the input

range setting the same, in order to allow product comparisons and to detect

deterioration over time.

To set the input range, proceed as follows from the main screen.

(The setting cannot be changed in recording or recall mode.)

1. Activate cursor in input range display section

Press the [RANGE] key to cause the input range display section

to be shown in reverse (cursor active).

RANGE

2. Select the channel for which to change the input range

Use the [ ]/[ ] keys to move the cursor to the channel whose

input range setting you want to change.

ENT

Page 83

3. Activate the range change mode.

Press the [ENT] key to bring up the sub menu.

ENT

4. Select the new input range setting.

Preparations

Use the [

]/[ ] keys to change the input range.

ENT

5. Con rm the new input range setting.

Press the [ENT] key to return to the condition of step 2.

ENT

6. If you want to change the input range for another channel, repeat

the procedure from step 2. Otherwise press the [RANGE] key to

complete the range setting procedure.

RANGE

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

OVER

appears on the display.

To improve reliability and ensure that overload does not occur for an extended

period, the overload history indication is convenient. This indication comes

on when there has been an overload event at any time within a given period.

To reset the indication, hold down the [CLEAR Ov] key. When the key is

released, overload history monitoring

OVER

begins, allowing the operator to

determine later whether there has been overload without having to constantly

check the overload indicator.

The overload history is also cleared when you make a recording parameter

setting. For details on clearing the overload history, see page 24 (Overload

Information).

Overload indication

Overload history indication

Page 85

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). Make the setting using the “Frequency Range” item in

<Rec.Parameters> menu.

The frequency range value represents the highest effective frequency that

will be included in the recorded waveform. Higher components will be cut

off. When making the setting, choose a value that is higher than the highest

frequency of components that need to be included in the recorded data.

Preparations

Setting the sampling frequency

Waveform sampling is carried out at a frequency that is 2.4 times or 2.56

times the frequency range value. Make the setting using the “Sampling Fre-

quency” item in <Rec.Parameters> menu.

To perform FFT analysis after recording, using the ×2.56 setting is recom-

mended.

Page 86

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.

Recording stops when the amount of data corresponding to the recording time

has been recorded. If repeat trigger is selected, the recording condition is not

terminated at this point. Rather, the unit goes into trigger standby mode and

recording begins again at the next trigger event.

Even before the amount of data corresponding to the recording time has

been recorded, recording can be stopped by pressing the [STOP] key. It will

also stop when the SD memory card becomes full. Data recorded up to that

point will be stored.

Setting the recording time

The recording time can be set to 1 s to 59 s (seconds), 1 m to 59 m (minutes),

1 h to 24 h (hours), and a “Manual” setting is also available. When “Manual”

is selected, recording continues until the [STOP] key is pressed. Regardless

of the recording t i me setting, when there is no more room on the SD memory

card to store data (remaining recording time is about 10 seconds), recording

stops. Recording to one  le is also limited to a maximum of 1000 hours.

When this limit is reached, the  le is closed.

REC

Recording time

1 to 24 h 1 to 59 m 1 to 59 s

Manual

Recording procedure

Data recording in progress

Recording procedure

Data recording in progress

Recording procedure

STOP

Recording stops when SD memory card becomes full or when file length has reached 1000 h (hours). (also at settings other than Manual).

Page 87

Preparations

Make the recording time setting using the “Recording Time” item in <Rec.

Parameters> menu.

When the “Pre Recording Time” has been set to 1 second, the recording

time can be set to a value of 2 seconds or higher. When the “Pre Recording

Time” has been set to 5 seconds, the recording time can be set to a value of

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

[ENT] key is pressed.

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. The

Pre Recording Time is not added to the recording time, rather it is included

in the total.

Make the Pre Recording Time setting using the “Pre Recording Time” item

in <Rec.Parameters> menu (page 45).

REC

PreRec. Time

= 0 s

PreRec. Time

= 5 s

Pre Recording

Time

Data recording in progress

Recording procedure

Data recording in progress

Difference in recording procedure with Pre Recording Time

(Pre Recording Time: 5 s, Recording Time: other than Manual, Trigger Mode: Free)

PreRec. Time

= 0 s

PreRec. Time

= 5 s

REC

Trigger standby

Trigger event

Recording procedure

Pre Recording

Time

Data recording in progress

Recording procedure

Data recording in progress

Difference in trigger operation depending on Pre Recording Time setting

(Pre Recording Time: 5 s, Recording Time: other than Manual, Trigger Mode: Single)

When the “Typ e” item of <Tr igger> menu is set to “Time”, the Pre Record i ng

Time setting has no effect.

Page 89

Preparations

Trigger co ndi ti ons

The trigger operation is determined by the trigger mode and trigger type.

When the trigger type is set to “Level”, the trigger level and trigger channel

must be set. 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.

Setting the trigger mode

This setting determines the basic trigger operation.

Make the trigger mode setting using the “Mode” item in <Trigger> menu.

If the trigger function is not required, select the “Free” setting.

Free (trigger off)

Recording starts immediately when the [REC] key is pressed and

ends when the amount of data corresponding to the recording

time has been recorded.

Single (single trigger)

The unit goes into trigger standby mode when the [REC] key

is pressed. When a trigger event occurs, recording starts. When

the amount of data corresponding to the recording time has been

recorded, recording stops.

Repeat (repeat trigger)

The unit goes into trigger standby mode when the [REC] key

is pressed. When a trigger event occurs, recording starts. When

the amount of data corresponding to the recording time has been

recorded, the unit again goes into trigger standby mode and the

operation is repeated.

Note

Repeat setting is possible also when the Recording Time is set to Manual. But the trigger operation is carried out only once.

Page 90

Preparations

REC

Recording procedure

Free

Single

Repeat

Trigger events

Data recording in progress

Recording procedure Trigger standby

Trigger standby

Data recording in progress

Data recording in progress Data recording in progress

Recording procedure Trigger standby

During data recording, trigger event is disregarded.

Difference in recording procedure according to trigger mode

(Pre Recording Time: 0, Recording Time: other than Manual, Trigger Type: Level or External)

Page 91

Setting the trigger type

This setting determines the type of event that serves as a trigger.

Make the setting using the “Type” item in <Trigger> menu.

Level (level trigger)

A trigger event occurs when the level of the input signal in the

speci ed trigger channel becomes equal or higher than a preset

threshold value (trigger level).

Note

• Delay of the record start time which recognized by the AC input signal when the trigger type is “Level”

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 lled trigger conditions. If you want to record all the waveforms which ful lled trigger conditions, set the “Pre Recording Time” in <Rec.Parameters> menu as 1 second or 5 seconds.

Preparations

External (external trigger)

A trigger event occurs when the state of the Ext. Trig. connector

changes from H (open) to L (shorted). Detection is carried out

on the falling edge.

External Gate (external gate trigger)

Data recording is carried out while the state of the Ext. Trig.

connector is L (shorted). Also after the state changes to H (open),

recording continues for  ve seconds (post-recording). If the state

of the Ext. Trig. connector is already L (shorted) when the [REC]

key is pressed, recording starts straight away because the trigger

conditions are met. With this trigger type, the recording time

setting has no effect.

Page 92

Preparations

Time

Recording is carried out from the speci ed Start Time to the spec-

i ed Stop Time, at intervals as speci ed by the Interval setting.

Note

The “Pre Recording Time” setting in <Rec.Parameters> menu has no effect. When the Stop Time is reached, recording will stop, also if the Recording Time is not yet completed.

REC

Recording procedure

Level

External

Gate

Time

Trigger channel

waveform

Ext. Trig.

connector signal

Trigger standby

Data recording in progress Data recording in progress

Data recording in progress

5 seconds after state changed from L to H

Data recording

in progress

Start time

Data recording in progress

Interval

Trigger standby

Data recording in progress

5 seconds after state changed from L to H

Data recording in progress

Stop time

Trigger level

Level trigger event

External trigger event

Ext. Trig. connectors shorted

Difference in recording procedure according to trigger type

(Pre Recording Time: 0, Recording Time: other than Manual, Trigger Mode: Repeat)

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” item in <Trigger> menu. The actual

trigger level is indicated on the bar graph for the trigger channel (see

page 26).

Setting the trigger channel

When the trigger type is set to “Level”, the channel to be used as trigger

channel must be set.

Make the setting using the “Ch” item in <Trigger> menu.

The indication “TRG” is shown at the left of the trigger channel. (For

information on level trigger target channel indication, see page 24).

Setting the start and stop time

When the trigger type is set to “Time”, set the start time and stop time

as follows.

Make the setting using the “Start Time” and “Stop Time” items in <Trigger>.

Note

When the start time setting is before the current time, the setting automatically becomes “current time + 5 minutes”. When the stop time setting is before the current time, the setting automatically becomes “Start Time + 24 hours”.

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

Stop TimeStart Time

Data recording

in progress

Recording Time

(1 s to 24 h)

Interval

Data recording

in progress

Recording Time

(1 s to 24 h)

Recording stops (Stop Time has priority)

When Recording Time is set to Manual, recording stops at the Stop Time

Stop TimeStart Time

Data recording

in progress

Recording Time: Manual

Recording begins at the speci ed start date/time and ends at the spec-

i ed stop date/time.

Page 95

Preparations

Repeat trigger precaution

If trigger conditions are met while a  le is being closed, the next recording

will not start.

Trigger event occurs during file save

Disregarded

(recording does not start)

rigger event

File write time

Recorded data are also written sequentially to a  le during the recording

process, but at the point where recording stops, there will be a certain

amount of data that still need to be written. In addition,  le management

information to allow later retrieval of the  le also needs to be created.

The “File is being written” message refers to this process of writing re-

maining data and  le management information. The following message

appears on the display during the process (see page 125).

Data recording

in progress

File is

being written

Trigger event occurs after file save is completed

" " is the time required to write previous data to SD memory card as a file.

Data recording

in progress

Recording starts

File is

being written

Time

Page 96

Preparations

Auxiliary function setup

Device index number (<System> menu: Index)

The index number setting has no in uence on performance or functions of

the unit. Setting an index number is optional. The setting range is 1 to 255.

Some possible uses for the index number capability are listed below.

1. Temporary management (classi 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.

Example 2 Manage recorded data according to measurement

purpose, measurement location, or similar.

Example 3 Manage recorded data according to measurement

parameters.

2. Using the index number as input range information

When using a system where a calibration signal is recorded in order

to calibrate recorded data, sensor range information will be required.

Using an input range value as the index number will facilitate data

management.

Example Set the index number to 120 when a sound level meter

is calibrated in input range 120 dB.

Page 97

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. For example, if noise was encountered at a certain point, the

marker can serve to locate and isolate the corresponding data.

Voice memo

While voice memo is activated, the sound picked up by the voice memo

microphone connected to the Voice Input connector can be recorded. When

the “Inp” item for CH5 in the <Input> menu is set to “Voice Memo”, the

indication appears to the right of the bar graph.

The level of the voice signal is shown by the bar graph for channel 5. Pressing

Preparations

the switch on the voice memo microphone activates voice memo recording.

Releasing the switch stops voice memo recording.

Marker

The marker function is only available during data recording. The maximum

number of marker points that can be set between the beginning and the end

of data recording is about 3,000.

When the “Inp” item for CH5 in the <Input> menu is set to “Marker”, the

indication appears to the right of the bar graph.

When the microphone switch is pressed, the indication  ashes for one

second.

The marker precision is about 1 second.

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.

REC

Recording start

Voice Memo

Marker

Microphone

switch status

Voice memo before recording Voice memo or marker (according to setting) after recording start

Released

Pressed

Voice memo Voice memo

Voice memo

Marker is set

for this time point

Voice memo

Input signal

Marker is set

for this time point

Voice memo microphone

MIC

Microphone switch

To Voice Input

connector

USB

DC IN 5-20V

Voice

Input

Sync.

Remote Controller

Ext. Trig.

Monitor

Out

Tacho

Output

Input

Page 99

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  eld.

Key lock Makes almost all keys inactive

Pressing and holding the [<] and [>] keys together for a few seconds activates

the key lock condition. In this condition, all keys except the [LIGHT] key

and the [<]/[>] keys are locked. Remote control operation remains possible.

To cancel the key lock state, press and hold the [<] and [>] keys once more.

During key lock, a key lock icon [ ] appears in the bottom left of the display.

Key lock activated

Hold down for 2 seconds

Indicates 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. Only the input range setting can still

be changed. This condition is called the menu lock mode.

When menu lock is active, the indication

call up a menu and attempt to make a setting, or if you attempt to delete data

in recall mode.

During menu lock, a menu lock icon [

display.

MENU LOCKED

] appears in the bottom left of the

appears if you

Menu lock mode

Normal menu

operation

LOCK

UNLOCK

Note

Operate the [MENU] switch only while power to the unit is switched off.