Convergence Instruments NSRTW mk3 Manuel utilisateur

NSRTW_mk3

User’s Manual

January 29 2019

Bruno Paillard

NSRTW_mk3 User’s Manual

1INTRODUCTION _____________________________________________ 3

2APPLICATIONS ______________________________________________ 3

3WARNINGS _________________________________________________ 4

4GETTING STARTED __________________________________________ 4

4.1 Software Installation ____________________________________________________________ 4

4.2 Hardware Installation___________________________________________________________ 4

4.3 Initial Test and Configuration ____________________________________________________ 5

5INSTRUMENT FUNCTIONS AND DESCRIPTION ___________________ 5

6PRINCIPLE OF OPERATION____________________________________ 6

6.1 Power Consumption ____________________________________________________________ 6

6.2 Battery Charging_______________________________________________________________ 6

6.3 Modes of Operation_____________________________________________________________ 7

6.4 LED Indicators ________________________________________________________________ 7

6.4.1 Charge LED________________________________________________________________ 7

6.4.2 Operation LED _____________________________________________________________ 8

6.5 Sound Level Calculation_________________________________________________________ 8

6.6 Manual Recording______________________________________________________________ 9

6.7 Automatic Recording with WiFi™ Connection (“W” model only) ______________________ 10

6.7.1 WiFi™ Connectivity ________________________________________________________ 10

7INSTRUMENT_MANAGER APPLICATION________________________ 12

7.1 Starting the Application ________________________________________________________ 15

7.2 Main Functions _______________________________________________________________ 16

7.3 Setup Tab ____________________________________________________________________ 16

7.3.1 Time and Date Field ________________________________________________________ 16

7.3.2 Temperature Field __________________________________________________________ 16

7.3.3 Instrument Info Field________________________________________________________ 16

7.3.4 Recording Field ____________________________________________________________ 17

7.3.5 Settings Field______________________________________________________________ 18

7.3.6 Battery Field ______________________________________________________________ 21

NSRTW_mk3 User’s Manual

7.3.7 Signals Field ______________________________________________________________ 21

7.4 Records Tab__________________________________________________________________ 21

7.4.1 Instrument Download _______________________________________________________ 21

7.4.2 File Save _________________________________________________________________ 22

7.4.3 File Open _________________________________________________________________ 22

7.4.4 Exporting Data_____________________________________________________________ 22

7.4.5 Global Level Calculations ____________________________________________________ 22

7.4.6 Graph Controls ____________________________________________________________ 23

7.4.7 Cursor Control_____________________________________________________________ 23

7.5 Spectrum Tab_________________________________________________________________ 24

7.5.1 Window __________________________________________________________________ 24

7.5.2 Weighting ________________________________________________________________ 24

7.5.3 Scale ____________________________________________________________________ 24

7.5.4 Cursor, Zoom and Pan_______________________________________________________ 25

7.6 WiFi Tab (“W” model only) _____________________________________________________ 25

7.6.1 Connection Status __________________________________________________________ 25

7.6.2 Cloud Setup _______________________________________________________________ 26

7.6.3 WiFi Settings (Without Cloud Service)__________________________________________ 29

7.6.4 Manual Connection _________________________________________________________ 30

7.6.5 Setting Up the Server to Work in a Local or Wide Area Network. _____________________ 30

7.6.6 Email Setup (Without Cloud Service) ___________________________________________ 31

7.6.7 WiFi™Battery Drain _______________________________________________________ 33

8INSTRUMENT_LISTENER APPLICATION ________________________ 33

8.1 File Storage___________________________________________________________________ 34

9MAINTENANCE _____________________________________________ 35

9.1 Battery Care__________________________________________________________________ 35

9.2 Reset Procedure_______________________________________________________________ 35

9.3 Operation Outdoors ___________________________________________________________ 35

9.4 Cleaning _____________________________________________________________________ 35

9.5 Software and Firmware Upgrades________________________________________________ 35

10 TROUBLESHOOTING_______________________________________ 36

10.1 USB Power Limitation _________________________________________________________ 36

10.2 USB Driver Installation_________________________________________________________ 36

10.3 Connection Problems __________________________________________________________ 36

NSRTW_mk3 User’s Manual

1Introduction

NSRTW_mk3 is the third generation of Convergence Instrument’s WiFi™ enabled smart integrating

sound-level meter/datalogger. It includes a type 1 digital MEMS microphone, an accurate date/time

clock, a non-volatile 128 Mb recording memory and wireless connectivity with fast USB and WiFi™

download (“W” model only).

Running on battery, it can record sound pressure levels and report them through WiFi™for a week.

Connected to an external USB charger it can record and report for months. Its very small size allows it

to be attached to or embedded within the monitored equipment.

The NSRTW_mk3 includes the following features:

•Type I precision.

•A, C and Z weighting curves.

•Integrating Sound-Level Meter, records L-max, L-min and Leq levels.

•Log interval adjustable from 125 ms (8 points per second) up to hours.

•Individual Manufacturer’s Certificate of Calibration from Convergence Instrument provided with

every instrument purchased.

•WiFi™connectivity to report measured levels remotely and automatically at preset intervals

(“W”model only).

•Email alarms for sound detected over specified threshold, as well as low-battery.

•Digital very sensitive MEMS microphone (30 dBA typical noise floor).

•Completely sealed weatherproof enclosure designed for outdoors applications.

•All-digital design.

•Ultra-stable sensitivity (field recalibration is easily done, but seldom required).

•Very low sensitivity variation due to temperature changes.

•Very low sensitivity to vibrations.

•Software function calculates global Leq and/or dose, according to ISO and OSHA methods.

•Adjustable response time.

•Preprogrammed recording start date/time.

•Integrated oscilloscope function that can show the acoustic signal in real time.

•Integrated spectral analyzer function that can show the spectrum (or 3rd-octave bands) in real

time.

•Can be used as a high-quality USB digital microphone.

•Allows the observation of recorded levels while the recording is ongoing.

•Works standalone, or USB connected.

•Long life internal rechargeable battery that recharges from USB and most USB chargers.

•Can be field-calibrated.

•Observes and records 100% of the acoustic signal (no missed samples).

•Editable individual custom ID for easier instrument management.

•All settings are stored in non-volatile memory. So the instrument will regain full functionality

and WiFi™connection from hard-reset or battery loss.

•Compatible with Convergence Instrument’s Cloud service.

2Applications

•Sound level and acoustic dose measurement and recording.

•Monitoring of safe working conditions.

•24/7 monitoring of construction noise.

•Email Alarms when the noise is too loud.

•Activity detection and logging.

•Long-term measurement and recording of acoustic levels for environmental impact studies.

NSRTW_mk3 User’s Manual

•Specially designed for long-term outdoors applications.

3Warnings

Never blow air at the microphone.

Avoid over-discharging the battery

•Recharge the instrument immediately if the LED indicates a low-battery condition.

•Even if the instrument is Idle all or most of the time, recharge it fully at least once every 6

months.

•When leaving the instrument idle for a long time, make sure the WiFi™periodic connection is

disabled.

Do not store or operate the instrument at temperatures exceeding the following limits

•-20 °C to 60 °C (-4 °F to 140 °F)

When using the instrument outdoors, make sure the USB connector is facing down.

This way rain will not accumulate in the connector and microphone port.

4Getting Started

4.1 Software Installation

•On the PC that is used to setup the instrument, run Instrument_Manager_Installer.exe. This

installs the Instrument_Manager application, as well as its USB driver and documentation.

•On the PC that is used as a server, to collect data over the network (“”W”model only), run

Instrument_Listener_Installer.exe. This installs the listener application that is used to respond

to instrument’s incoming connections, and create and fill the corresponding data files.

Note: The same PC can be used for both applications.

Note: Perform the software installation above BEFORE connecting the instrument to the PC for the

first time.

4.2 Hardware Installation

1. Connect the instrument to an available USB port on the PC

NSRTW_mk3 User’s Manual

2. Verify that the PC properly detects the instrument and loads the driver. In case of doubt see

section Troubleshooting.

4.3 Initial Test and Configuration

1. Upon connection to the PC, the charge LED should light-up yellow (charging) or green

(charged). The operating LED should blink once per second.

2. Go into Start\All Programs\Convergence_Instruments\Instrument_Managerand run

Instrument_Manager.exe. The front-panel described in Figure 2 appears, and the application

tries to connect to the instrument. If it fails to find the instrument it indicates No Device Found. If

this is the case see section Troubleshooting

3. Otherwise the application switches-on the NSRTW_mk3 and starts communicating with it.

4. If the Time and Date in the upper right corner of the application window are not properly

adjusted the application asks if you want the instrument time to be synchronized to the PC

time. Only say YES if the PC time is correct.

5. In addition, the application detects if the time zone of the instrument is different from the time

zone of the PC. If it is, the application asks to set the instrument to the same time zone as the

PC.

Note: If (in rare cases) the instrument is not intended to be used in the same time zone as

that of the PC used to configure it, we suggest to temporarily change the PC’s time zone to the

time zone where the instrument will be recording, let the application set the instrument to the

PC’s time zone, and change the PC’s time zone back after that initial setting. Afterwards

if/whenever the application asks to change the instrument time zone back to the PC’s time

zone, simply choose to cancel the adjustment.

6. In the front-panel of the application you should see the acoustic signal display in real-time.

5Instrument Functions and Description

The instrument connects to a PC on a USB port. The Instrument_Manager application is used to set its

operating parameters and download recorded data.

NSRTW_mk3 User’s Manual

Figure 1 NSRTW_mk3

1. Charge LED

2. Operation LED

3. USB Connector

4. Reset Button

6Principle of Operation

6.1 Power Consumption

The NSRTW_mk3 is always on. However, when not in operation it only measures time, which only

takes a tiny operating current. In that Idle state it can stay on for up to 6 months.When the

NSRTW_mk3 is actively measuring, its power consumption allows it to record for 1 week.

The NSRTW_mk3 can be configured to connect to a server at regular intervals. When that function is

enabled, the NSRTW_mk3 will activate its WiFi™ interface at the defined interval, and attempt to

connect via WiFi™ for up to 1 minute. During that time, the instrument’s power consumption will be

increased. If the connection fails the NSRTW_mk3 will fall back to its previous state (Sleep or

Recording).

Note: WiFi™communications consume battery, so when leaving the NSRTW_mk3 unused for a

long time, it is important to disable the WiFi™periodic connection feature.

In applications where the NSRTW_mk3 must record for longer periods of time, it can be connected to a

USB charger https://convergenceinstruments.com/product/universal-usb-wall-charger-usbw-001\. For

outdoor-use, a USB-output solar panel, such as the one found in

https://convergenceinstruments.com/product/data-logger-accessories-solar-pannel/ is an ideal solution

that will power the instrument indefinitely.

6.2 Battery Charging

The battery charges whenever the following conditions are met:

•The battery has not reached full charge.

•The instrument is connected to a PC’s USB port and the PC is not in standby, or

•The instrument is connected to a USB charger.

NSRTW_mk3 User’s Manual

While charging, the charge LED is orange. When fully charged, the LED changes to green and the

charging stops.

The charge time from a completely discharged state varies with the amount of power the PC allows the

instrument to draw. Charge time is normally around 2H30. If the PC only allows 300 mA, the charge

time can increase up to 5 to 6 hours.

Note: When connected to a PC, battery charging stops while the PC is in standby.

Note: It is OK to leave the instrument connected to a PC or USB charger all the time. The smart

charger inside the instrument will stop charging as soon as the battery reaches full-charge.

6.3 Modes of Operation

The NSRTW_mk3 has four modes of operation:

Mode

Operation

Power Consumption

Idle

Disconnected from USB and not actively

recording - Only keeps time.

Minimal: can stay on for up to 6

months.

Active

Connected to USB – Not recording –

Instrument is fully on and measuring

Instrument draws power from USB to

power itself, and if necessary recharge

its battery. Battery is not depleted.

Recording

USB-connected or not - Fully on and

recording.

If USB-connected, power comes from

USB. If not, power comes from the

internal battery.

If not connected the

instrument can record for up to 7 days.

Periodic

WiFi™

Connect (“W”

model only)

From any state, including Idle and

Recording, the instrument can periodically

wake up its WiFi™interface and attempt

to connect to a server. If the connection is

not established after 1 minute it falls back

to its original state until the next connection

time.

If USB-connected, power comes from

USB. If not, power comes from the

battery. The Periodic Connect feature

consumes battery. This is especially

the case if the connection interval is set

to be short so it occurs often.

Table 1

6.4 LED Indicators

The NSRTW_mk3 has two LED indicators:

6.4.1 Charge LED

The charge LED is always fully on or off.

NSRTW_mk3 User’s Manual

LED State

Meaning

Off

Instrument is disconnected, or is connected to a PC that is in standby.

Green

Instrument is connected to a PC or USB charger, and the battery is full.

Orange

Instrument is connected to a PC or USB charger, and the battery is charging.

Table 2

6.4.2 Operation LED

The operation LED is always blinking.

LED State

Meaning

Off

Instrument is in Idle mode.

1-blink/second

Instrument is in Active mode, but is not actively recording.

2-blinks/second

Instrument is actively recording.

1-blink/second

(off-beat)

Instrument is presently communicating with a server via WiFi™

4-blinks/second

Battery is low. Recharge as soon as possible. If the battery level becomes critical

the instrument will go to Idle mode (LED-off) in order to safeguard the battery

against over-discharge as much as possible.

Table 3

6.5 Sound Level Calculation

After extracting the signal power, the calculated sound levels are low-pass filtered (smoothed) using an

adjustable time constant. This time constant is applied to the calculation of L-min and L-max, but not

Leq. A typical short time constant (125 ms) allows the measurements to track sharp changes, while a

longer time constant (1s) provides more stable (cleaner) RMS values that averages-out short

transients.

The Leq is integrated linearly over the specified log interval, irrespective of the time constant setting.

The sound level statistics (L-min, L-max and Leq) are gathered for the specified log-interval before

being written to the recording memory. The log-interval represents the interval at which the selected

statistics are written to memory. Therefore a longer log-interval uses less memory, while a shorter log-

interval provides better time resolution and allows the user to distinguish between events that occurred

close together. The statistics (L-min, L-max and Leq) are reset at the beginning of each log-interval.

Then the statistics are gathered sample-by-sample during the log-interval. At the end of each log

interval the calculated statistics are written to memory, and the next log-interval is started. No portion of

the signal is overlooked.

The log interval is set to 1 second by default. It can be set to as short as 1/8 s.

NSRTW_mk3 User’s Manual

Note: The time constant only affects the calculation of Lmin and Lmax. The Leq is integrated linearly

over the specified log interval.

6.6 Manual Recording

Every time a recording is started, a new record is created in memory and filled until the recording is

stopped. That record is time-stamped, so the signals can be displayed with respect to absolute

date/time. Records are stored sequentially in the instrument’s memory. There is no limit to the number

of records that the memory can contain, only a limit to the total size of the data recorded. The

Instrument_Manager application displays the total memory recording time as a function of the various

setup parameters.

After (or while) recording, the records contained in memory can be downloaded from the instrument

and observed or exported. In case a recording is ongoing the last record is only displayed up to the

present time.

The recording is stopped automatically when the recording memory is full. This way a new record will

not overwrite an old one.

The recording memory is non-volatile, so there is no risk of losing the data that has already been

recorded, even in the case of a reset or battery failure.

Note: It is perfectly legal to find empty records in memory. That occurs typically when a recording is

started and stopped quickly (for a time shorter than the log interval), before any data had time to be

written to memory. In that case only the time-stamp is written to memory.

An empty record can also occur when a recording was started but no data (Lmin, Lmax or Leq) was

selected to be recorded.

To record sound levels proceed as follows:

1. Select the statistics to be recorded (L-min, L-max and/or Leq).

2. Select the log-interval. Note that the total recording time is automatically calculated and

displayed by the Instrument_Manager application, as a function of the log-interval and statistics

selected. The log-interval is adjustable in 125 ms increments, from 125 ms up to 2H.

3. Select the time constant used to smooth the measured sound levels for L-min and L-max.

Choose the Fast time constant (125 ms) to be able to detect short peaks and valleys. Choose

the Long time constant (1 s) to provide cleaner more stable sound levels. Or adjust to another

value, as required by the application.

4. When ready to start a recording immediately, simply press the Record button. Press Record

again to stop the recording.

5. Or to set a start time/date:

•Check to make sure that the instrument time is correct. If that is not the case press the

Sync button in order to automatically set the instrument time to the PC time.

•Press the Timer button. Set a start time and date using the calendar.

•Click OK to arm the trigger.

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