XL2

Nti Audio XL2 User Manual

OPERATING MANUAL

HANDHELD AUDIO AND

XL2

ACOUSTIC ANALYZER

Contact NTi Audio at

Headquarter +423 239 6060 info@nti-audio.com Americas +1 503 684 7050 americas@nti-audio.com China +86 512 6802 0075 china@nti-audio.com Czech +420 2209 99992 czech@nti-audio.com Germany +49 201 6470 1900 de@nti-audio.com Japan +81 3 3634 6110 japan@nti-audio.com South Korea +82 2 6404 4978 korea@nti-audio.com United Kingdom +44 1438 870632 uk@nti-audio.com

www.nti-audio.com

NTi Audio AG Im alten Riet 102, 9494 Schaan Liechtenstein, Europe is an ISO 9001:2008 certiﬁed company.

Firmware V4.04 Version 4.04 / Sep 18

All information subject to change without notice. © All rights reserved. ® Minirator is a registered trademark of NTi Audio. ™ XL2, XL2-TA, EXEL, M2230, M2230-WP, M2211, M2215, M4261 and MA220 are trademarks of NTi Audio.

Ma d e i n

Switzerland

Table of Contents

1. Introduction .....................................................................5

2. Overview .......................................................................... 7

Operation The Screen Display

3. Getting Started

Power Supply Attaching the Hand Strap Unfolding the Stand Connecting the XL2 Switching the XL2 On and Off Select Measurement Function Calibration prior Measurement

4. Sound Level Meter ........................................................ 22

Overview Sound Level Meter - Getting Started RTA Measurement - Getting Started Reporting Wav-File Recording Events (optional) Limits Correction Value KSET Locked Run Mode

....................................................................... 9

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5. Acoustic Analyzer ..........................................................64

FFT Analysis + Tolerance Reverberation Time RT60 Polarity

.........................................................................86

Delay Time 1/12 Octave + Tolerance (optional) Noise Curves (optional) Speech Intelligibility STIPA (optional)

6. Audio Analyzer ............................................................133

RMS / THD+N Oscilloscope

7. Calibration ...................................................................137

8. Proﬁles .........................................................................144

9. Spectral Limits Option (Capture + Tolerances) .........151

10. Vibration Meter

VibMeter / CPB Overview FFT Analysis + Tolerance Oscilloscope 1/12 Octave + Tolerance (optional)

...................................................................90

............................................................ 133

..............................................................136

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...............................................................174

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............................. 175

Table of Contents

11. System Settings ........................................................ 179

Settings Information Scheduler Vibration

12. Data Management ....................................................187

Record Voice Notes Recall Measurements Append Measurements

13. XL2 Projector PRO Software

14. XL2 Data Explorer (optional)

15. Building Acoustics (optional)

16. Sound Power (optional)

1 7. Unattended Noise Monitoring

18. Time Synchronization...............................................218

19. Remote Measurement .............................................. 222

20. Microphones .............................................................224

21. Further Information ..................................................228

My NTi Audio Tips and Troubleshooting Firmware Update Options

...................................................................... 179

................................................................182

................................................................... 183

..................................................................... 186

.................................................... 193

................................................ 199

............................................ 201

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...................................208

................................... 210

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.............................................................228

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.......................................................231

......................................................................232

Warranty Conditions Service and Repairs Calibration Certiﬁcate Declaration of Conformity

22. Technical Data XL2 .................................................... 254

23. Technical Data Microphones ....................................263

24. Technical Data PreAmpliﬁer

Appendix

.........................................................................272

Appendix 1: Standard - Optional Features Appendix 2: Factory Default Proﬁles Appendix 3: Description Sound Levels Appendix 4: Common Sound Levels Appendix 5: Vibration Meter Functions

..................................................250

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1. Introduction

Introduction

Thank you for purchasing the XL2 Audio and Acoustic Analyzer. The XL2 Analyzer forms the unique combination of a state-ofthe-art Sound Level Meter, a comprehensive Acoustic Analyzer as well as a powerful Audio Analyzer. The wide range of functionalities is tailored for:

Evacuation Systems•

Speech Intelligibility

Electroacoustic Installations •

Installed Sound

AV Installations Cinemas

Noise Measurement•

Unattended Noise Monitoring

Environmental Noise

Occupational Health

Vehicle Noise

Sound Power

Noise Curves

Live Sound•

Sound Level Monitoring

Front of House

PA Rental

Broadcast•

Room & Building Acoustics•

Room Acoustics

Building Acoustics

RT60 Reverberation Time

Industrial Quality Control• Condition Monitoring•

How to Read this Manual

The XL2 push buttons are displayed as icons

, , , , . A detailed description of the push buttons is

listed in the chapter Overview - Operation.

Menu items displayed on the XL2 page screens are shown in this user manual by a bold font, e.g., SLMeter, Parameter, ...

, , , ,

Introduction

Product Conﬁgurations

The following items are included with the respective model:

XL2 without Microphone:

XL2 + M2230:

XL2 Analyzer• Test Signal CD• USB cable• Li-Po battery• Hand strap• Operating manual•

XL2 Analyzer• M2230 Measurement Microphone• consisting of

Microphone PreAmpliﬁer MA220

Microphone Capsule MC230 or MC230A

50 mm Windscreen• Microphone-holder MH01 • with Adapter 5/8“ - 3/8“ Individual Frequency Response Chart• Test Signal CD• Li-Po battery• USB cable• Hand strap• Operating manual•

XL2 + M2211:

XL2 + M4261:

XL2 Analyzer• M2211 Measurement Microphone• consisting of

Microphone PreAmpliﬁer MA220

Microphone Capsule for M2211

33 mm Windscreen• Microphone-holder • with Adapter 5/8“ - 3/8“ Test Signal CD• Li-Po battery• USB cable• Hand strap• Operating manual•

XL2 Analyzer• M4261 Measurement Microphone• 33 mm Windscreen• Microphone-holder • with Adapter 5/8“ - 3/8“ Test Signal CD• Li-Po battery• USB cable• Hand strap• Operating manual•

2. Overview

Overview

Tripod Mount

XL2 interfaces:

XLR Input

RCA Input

Voice Note Input

Speaker

Digital I/O

USB Connector

DC Power Socket

SD Card

TOSLink Output

Headphone Output

Overview

XLR Signal Input

Either a balanced audio signal, an NTi Audio measurement microphone or the microphone pre-ampliﬁer MA220 plug directly into the XLR input. The Automated Sensor Detection (ASD) technology reads the electronic data sheet of any connected NTi Audio device after the 48 V microphone phantom power is activated.

RCA Input

Unbalanced audio signal input.

Voice Note Input

Internal microphone for recording voice notes and measuring polarity and delay time. For polarity measurements, an external microphone may also be used.

DC Power Socket

Socket for mains power adapter. Further details in the chapter Power Supply in this manual.

USB Connector

Mini-B USB connection, for accessing the SD Card.

Digital I/O

Programmable digital inputs/outputs.

SD Card

For storing data, screenshots, voice notes, wav-ﬁles.

TOSLink Output

24 bit linear PCM audio signal output. For future use; not active at this time.

Headphone Output

The XLR/RCA input signals are routed to the headphone connector (3.5 mm Minijack; mono monitor wired to both channels of stereo jack). Connecting headphones mutes the internal speaker. To connect the headphone output directly to a line input, a load impedance < 8 kOhm is required for proper operation. This can be achieved by inserting a 1 kOhm resistance between tip and ground of the output jack.

Speaker

The XLR/RCA input signals are routed to the speaker. Press the speaker button

to toggle the speaker on/off. Press and hold the speaker button to access the volume control. Set the speaker level with the rotary wheel

Tripod Mount

Mechanical mount for attaching the XL2 to a tripod or microphone stand.

Overview

Operation

9 8 7

Page Control

Switches among various screens depending on the menu function selected.

Volume of Speaker and Headphone Output

Press the button• brieﬂy to enable or disable the speak- er.

 The speaker is activated and the speaker or headphone

icon appears in the upper menu bar.

Press and hold the speaker button •

 A pop-up window for volume is displayed.

Overview

Hold the speaker button • down and adjust the level of the speaker and headphone outputs with the rotary wheel

. Digital gain control prevents gain increases beyond a level that will cause signal clipping. The maximum gain setting depends on the connected input signal. The headphone output provides a linear output signal us-• ing the SLMeter function over a measurement range of 57 dB. The minimum Z-weighted sound pressure level at reference sensitivity is:

M2230: 58 dB

M2211: 64 dB

M4261: 66 dB

Power & Backlight

The power button switches the instrument on. The XL2 is immediately ready for operation. Holding down the power button a brief press of the power button

for one second switches the XL2 off. Additionally,

toggles the backlight

during operation.

Limit

SLMeter: • The limit button lights up green, yellow or red

according to the settings in the Limit page. Press the limit button

to access the Limit page. For more details

visit the chapter Sound Level Meter: Limits.

FFT + Tol: • The limit button lights up green for results within tolerance and red for out-of-tolerance results. Polarity: • The limit button lights up green at positive polar- ity and red at negative polarity. 1/12 Oct + Tol: • The limit button lights up green for results within tolerance and red for out of tolerance results.

Pause

Pauses the current measurement. Press the pause button

or the start/stop button to continue the measure-

ment. The data logging is continued in the function SLMeter/RTA during the pause period and listed in the log ﬁle.

Start/Stop

Starts and stops a measurement.

Enter

Conﬁrms a selection.

Rotary Wheel

Selects the required measurement function or the individual measurement parameter.

ESC

Terminates an entry, returns to the top menu level or closes an open window.

Overview

The Screen Display

The XL2 displays the actual sound levels also in case of no measurement has been started. Any displayed averaged level refers to the previous measurement period. The XL2 shows four lines in case of no previous measurement period is applicable.

Display Contrast Setting

Hold down escape • desired contrast is reached.

Updating of display

Numeric values• Updated every 500ms independent of the measurement function. The maximum time span between the end of the measurement period and the ﬁrst test result display is 500ms. Graphs and spectra• Updated every 50ms

and turn the rotary wheel until the

2 3 4 75 986

The display is updated continuously during measurement.

Overview

Measurement Results

Individual level measurement results.

Main Menu

SLMeter/RTA SPL & RTA Measurement

FFT + Tol FFT Analysis with optional Tolerance

Management

RT60 Reverberation Time RT60

Polarity Polarity

Delay Time Delay Time

RMS/THD+N RMS Level and Distortion

Oscilloscope Scope

1/12 Oct + Tol Spectral Analysis with Tolerance Man-

agement (optional)

Noise Curves Noise Curves

STIPA Speech Intelligibility (optional)

Cinema Meter Calibration and veriﬁcation of cinema

loudspeaker systems (optional)

Calibrate Calibration Menu for microphone

Proﬁle ... Store and load measurement proﬁles

System System Settings

Page Selector

Toggles between available measurement and result pages within the same function menu. Alternatively use the page button

Input Selector

Select XLR or RCA input connectors as the source.

Memory Menu

The memory menu is used for data storage management. One of the following symbols ﬂashes before or after starting the measurement:

9-8-7 Time in

seconds until instrument is settled and

measurement will start.

RUN Indicates the ongoing measurement.

LOG Indicates the ongoing measurement with data

logging.

AUD Indicates the ongoing measurement with data

logging and audio recording.

Evt Indicates an ongoing triggered-event recording.

Overview

After a completed measurement, the memory symbol indicates a non-saved measurement report. Your measurement needs to be stored manually. For more details visit the chapter Data Management.

Speaker/Headphone

Indication of enabled rear speaker or headphone output.

Phantom Power Supply

48V The

XL2 provides 48 V phantom power supply

to the connection microphone or sensor.

ASD An NTi Audio measurement microphone with

automated sensor detection ASD is connected. The XL2 reads the electronic data sheet of the microphone and switches the 48V phantom power automatically on

48V Phantom power is switched off.

Real-Time Clock

The real-time clock is set in the System menu.

Battery Symbol

The battery symbol indicates the battery status as follows:

Using rechargeable Li-Po battery:

Level indication 100% (U > 4.0 Volt).

Level indication: 75%: U = 3.9 - 4.0 Volt 50%: U = 3.8 - 3.9 Volt 25%: U = 3.7 - 3.8 Volt

Level indication 0% (U < 3.7 Volt). The battery is almost empty and must be recharged.

The battery is being recharged by the mains power adapter.

The XL2 is connected via USB to a computer. The battery charge level decreases slowly during XL2 usage.

Using standard AA batteries:

No level indication as long as U > 4.5 Volt.

Level indication 0% (U < 4.5 Volt). The batteries are almost empty and should be replaced.

Using mains or supply:

No indication of battery status.

Getting Started

3. Getting Started

Power Supply

The XL2 offers ﬂexible power management options and can be operated either by

Replaceable, rechargeable lithium-polymer (Li-Po) battery • (included with the XL2 Analyzer) 4x AA-batteries• Mains Power Adapter•

The new battery is charged to approximately 50% and should be fully charged before use with:

Battery Charger (optional)

Mains Power Adapter (optional)

USB Power from PC

Charging Time: approx. 3 hours NTi Audio #: 600 000 332

Charging Time: approx. 6 hours Leave the battery inside and switch off the XL2 NTi Audio #: 600 000 333

Charging Time: approx. 6 hours Switch off the XL2 ing.

for charging.

for faster charg-

Operation using Mains Power Supply

You can also operate the XL2 with the optional NTi Audio Mains Power Adapter. During such operation it is recommended to leave the batteries inside the instrument.

Mains Power Adapter

Electrically-isolated, linear DC power supply• A decreased THD+N performance will oc-• cur with unbalanced input signals when using switching-type power supplies (approx. 3 dB). Non-NTi Audio power supplies may have fur-• ther negative effects on measurements. Damage caused by using an inappropriate ex-• ternal DC supply is not covered by warranty.

DC Power supply speciﬁcations

Voltage: 7.5 - 20.0 Volt• Power: minimum 6 Watt• Connector type: 2.1 x 5.5 x 9.5 mm• Polarity: •

Getting Started

Rechargeable Li-Po Battery

Open the battery cover at the rear of the instrument.• Insert the rechargeable battery with the contacts edge ﬁrst.• Close the battery cover.•

Switch off the XL2 for faster recharging by mains power adapter or USB connection.

Caution

Switch the XL2 off prior opening the battery • cover in order to prevent any electronic discharges. Avoid short-circuits.• Operate and charge the battery between 0°C • and 45°C (32°F - 113°F). Do not heat the battery above 60°C.• Do not place the battery in or near ﬁre.• Do not solder directly on to the battery.• Do not disassemble the battery.• Do not insert the battery in reverse polarity.• Remove the battery for applications with a • connected mains power adapter over multiple weeks.

Getting Started

AA-Batteries

Alternatively, the XL2 can be powered by AA type batteries

Open the battery cover.• Insert 4 fully-charged AA batteries, observing correct polarity • of the +/- indications in the battery compartment.

 The polarity alternates with successive batteries.

Close the battery cover.•

Switch the XL2 off prior opening the battery • cover in order to prevent any electronic discharges. Use only similar batteries from the same • manufacturer. Replace discharged batteries with new ones.• Do not mix used and new batteries.• During operation, the battery temperature • may increase noticeably. This is not a defect. Remove all batteries if the XL2 is not to be • used over a long period of time.

Getting Started

Attaching the Hand Strap

To avoid accidentally dropping the XL2, a hand strap is supplied with the instrument.

Pull the loop of the hand strap through the opening.• Pull the other end of the hand strap through the loop.• Pull the hand strap tight.•

2.1. 3.

Getting Started

Unfolding the Stand

A convenient table stand is attached to the rear of the instrument.

Unfold the stand and rest the XL2 on a ﬂat surface.•

Connecting the XL2

Acoustic Measurements

Connect an NTi Audio measurement microphone to the XLR input connector of the XL2.

Getting Started

Audio Measurements: XLR Connection

Connect the source to the XL2 with an XLR cable.• Select the XLR input in the menu.•

Audio Measurements: RCA Connection

Connect the source to the XL2 with an RCA (cinch) cable.• Select the RCA input in the menu.•

Getting Started

Switching the XL2 On and Off

Switching On the XL2

Press power

 There is a brief sound of relays and the display illuminates.

Switching Off the XL2

Press power the XL2.

to switch on the XL2.

and hold it down for one second to switch off

Select Measurement Function

Navigate with the rotary wheel • to the main menu bar. Conﬁrm with enter •

 The main menu window opens

Scroll up/down with the rotary wheel • to select the re- quired function and conﬁrm with enter

to select the measurement function.

Main menu with enabled options

The measurement function is selected.

Getting Started

Setting the Parameters with the Rotary Wheel

Turn the rotary wheel • screen.

to navigate within the display

The selected parameter is highlighted with a black back-

ground.

Conﬁrm with enter • .

 The parameter display ﬂashes and/or available parameters

or settings are shown.

Turn the rotary wheel • enter Conﬁrm with enter • .

through the settings.

to set the parameter or toggle with

Now the parameter is set.

Calibration prior Measurement

We recommend the daily calibration of the XL2 Analyzer with the Sound Calibrator. This ensures accurate measurement results.

For more details see chapter Calibration.

Sound Level Meter

4. Sound Level Meter

The XL2 provides, together with the measurement microphone, a precise sound level meter for monitoring live sound events and/or environmental noise.

The Type Approval Option upgrades the instrument to the XL2-TA, the sound level meter dedicated to certiﬁed measurements. The XL2 with the M2230 microphone forms a type approved sound level meter offering class 1 performance according IEC61672 (see chapter Options and Accessories)

For example, Actual, Lmin, Lmax, Leq with frequency weighting A, C and Z and time weighting F and S can be measured at the same time. All measurement results are simultaneously available. You may log all acquired level information, including real-time information, onto the removable SD Card. To complete the documentation of the measured sound pressure levels, the XL2 offers wav-ﬁle recording, as well as the facility to add voice notes for each measurement. The XL2 measures correction values between the loudest point of the live event and the actual measurement positions in accordance with DIN 15905-5 and SLV. In parallel with the wide band parameters, the XL2 measures the real-time spectrum either in 1/1 or 1/3 octave-band resolution. The RTA perfectly suits tasks such as optimization of sound systems

Extended Acoustic Pack (optional)

The Extended Acoustic Pack offers the following additional features for sound-level and acoustic measurements:

SLMeter/RTA function•

Recording of linear wav-ﬁles (24 bit, 48 kHz)

Percentiles for wide band and spectrum with ﬂexible set-

ting from 0.1% to 99.9% Sound Exposure Level L

100 ms logging

RTA logging of Lmin and Lmax

Event-triggered audio and data recording

Time weighting: Impulse (LxI, LxIeq with x= A, C, Z)

True peak level in 1/1 and 1/3 octave resolution

Clock-impulse maximum level (TaktMax) and values as

speciﬁed in DIN 45645-1 Impulsiveness detection in accordance with BS4142:2014

and NordTest ACOU 112

FFT function•

High-resolution Zoom-FFT with selectable frequency

ranges and resolution up to 0.4 Hz in the range of 5 Hz to 20 kHz

RT60 function•

Reverberation time RT60 in 1/3 octave resolution

Sound Level Meter

The sound level meter offers different pages:

Page Selection using the Page Button

Press page • to toggle between the 123 SLMeter page and the RTA page.

Page Selection using the Rotary Wheel

Select the page • 123 SLMeter with the rotary wheel . Conﬁrm with enter •

Menu with enabled options

You have selected the individual sound level meter page.

123 SLMeter: Sound Level Meter

Displays the selected broadband sound level results. You can change the font size of the result. Depending on the font size chosen, the XL2 shows 3 or 5 results simultaneously. Individual frequency weighting, time weighting, actual, minimum, maximum and correction values can be chosen for each displayed result.

RTA: Real-Time Spectrum

Displays the 1/3 or 1/1 octave spectrum of the selected sound level within the audio band. Additionally the wide band result is shown graphically by a bar.

Reporting: Report Setting

Here you set which sound pressure levels shall be stored in a .txt ﬁle after the completed measurement. Choose between:

ALL Stores all sound pressure levels.

Selected Stores up to 10 different individually-deﬁned

sound pressure levels.

For details refer to the chapter Reporting.

Sound Level Meter

Logging: Setup of Data Logging

The XL2 features a powerful sound level meter data logger, which allows you to record all required sound level values during the measurement. In the logging page you set which sound pressure levels shall be logged over time. For details refer to the chapter Logging. Choose between:

ALL Logs all sound pressure levels.

Selected Logs up to 10 different individually-deﬁned sound

pressure levels.

Event Trigger: Event Setting (optional)

The event function is available with the optional Extended Acoustic Pack. The XL2 event feature offers the following functionalities:

Automated event triggered at noise levels above/below a • preset value including setting markers for speciﬁc noise categories. Application example: Recording the noise level for LAF > 80 dB. Event triggered by external key press of the XL2 Input Key-• pad. You can utilize four keys (1-4) to categorize any noise of interest or noise to be later excluded in the post-processing. A typical application is categorizing any annoying industrial noise by persons living in the neighborhood.

Limit LED: Limit Setting

ere you set the function

of the limit LED , thereby highlighting any sound level that exceeds the pre-set limits in orange or red color. Further, external peripherals are controlled by the optional Serial I/O Interface based on the sound level, such as displaying sound levels on a large external red-orange-green lamp. For details refer to the chapter Limits.

SET Correction: Setup of Correction Values

This page provides a wizard to measure correction values, which could be helpful for compliant sound level monitoring of live events. It measures the correction values between the actual measurement position and the loudest position accessible by the audience. The XL2 displays and logs the selected sound pressure levels including the correction values, allowing the sound engineer to monitor the sound level at the loudest position in the audience. The measurement meets the requirements of the standards DIN15905-5 and SLV. For details refer to chapter Correction Value K

SET.

Sound Level Meter

Set EQt, L%: Selection of measured levels

This page allows setting the following levels:

Moving Time-average Sound Level• Gliding Leq with selectable time window from one second to one hour. Four individual levels can be conﬁgured. This level is also called “running Leq,T” or “sliding Leq,T”. Percentile Sound Level•

Allows the individual conﬁguration of seven statistic lev-

els from 0.1% to 99.9% (optional with Extended Acoustic Pack). The

- Broadband Source for the calculation of the level sta- tistics can be chosen from a set of different levels with either a frequency weighting A, C or Z. The time weightings F, S and the moving time-averaged sound level for one second are supported.

Sound Level Meter

Overview

Numeric Result Page

The numeric result page 123 SLMeter displays the selected broadband sound level results. You can change the font size of the result. Depending on the font size chosen, the XL2 shows three or ﬁve results simultaneously. Individual frequency weighting, time weighting, actual, minimum, maximum and correction values can be chosen for each displayed result.

4 5

Real-Time Analyzer Page

The real-time analyzer page RTA measures and displays the 1/3 or 1/1 octave spectrum from 6.3 Hz to 20 kHz including wideband results. The real-time spectrum RTA is measured in parallel with the A and Z-weighted wideband levels.

Sound Level Meter

Sound Level Result 1

All sound levels are measured and logged simultaneously. You select which sound levels should be displayed.

Change Parameter

Turn the rotary wheel • Press enter •

to open the selection menu and choose

to select the parameter Lxx.

the wideband sound pressure level to be displayed. Turn the rotary wheel • parameters and conﬁrm with enter

to select the required test result

Change Font Size

Turn the rotary wheel • Press enter •

1x, 2x or 3x to set the font size to small,

to select the actual test result.

medium or large.

The XL2 shows 3 sound levels on the display if a large font is chosen, otherwise it shows 5 sound levels.

Sound Level Result 2 & 3

Follow the setting instructions for sound level result 1.

Sound Level Result 4 & 5

To display sound level results 4 & 5, choose a smaller font for all results. Follow the setting instructions for sound level result 1.

Input Range

The XL2 Analyzer provides three input ranges to accommodate the wide range of input signals. The individual ranges are based on the microphone sensitivity setting in the calibration menu of the XL2. For example at a sensitivity S=20mV/Pa the input ranges are

Low: 10 - 110 dBSPL• Mid: 30 - 130 dBSPL• High: 50 - 150 dBSPL•

Select the lowest possible input range according to the maximum level expected during the measurement; e.g., if the sound pressure will always be below 110 dBSPL, then select the lowest input range 10 - 110 dBSPL.

Run Indication

The run indication shows the measurement status running, paused or stopped. Various measurement settings are locked during ongoing measurements, such as changing the input ranging or the preset measurement time.

Sound Level Meter

Actual Measurement Time

Counts actual measurement time in hrs:min:sec. Supports time modes: continuous, single and (synchronized) repeat.

Timer Mode Continuous

(applicable for standard measurements) All values are recorded and monitored continuously after starting a measurement with start The actual measurement time is shown.

Timer Mode Single

Automatically stops the measurement after the pre-set measurement time.

Set the required measurement time.• Start the measurement •

 The actual measurement time counts back to zero and

the measurement ends.

All measurement results may be recalled.•

Timer Mode Repeat

Provides automated repeated measurements with user-deﬁned, preset measurement time cycles.

Set the required measurement time.• Press start •

 The actual measurement time counts back to

zero. When the preset measurement time has elapsed, the measurement time and the measurement results are reset and a new measurement is started. All measurement results of the previous cycle are reset.

Press stop •

to complete the measurement.

Sound Level Meter

Timer Mode Repeat Synchronized

Provides automated repeated measurements synchronized to the XL2 real-time clock. Press start

to begin the measurement. In order to align the selected preset measurement time with the real-time clock, the XL2 shortens the ﬁrst cycle to match the real-time clock synchronization. All following measurement cycles are synchronized to the real-time clock.

Phantom Power Supply

48V The

ASD An NTi Audio measurement microphone with

XL2 provides 48 V phantom power supply

to the connection microphone or sensor.

automated sensor detection ASD is connected. The XL2 reads the electronic data sheet of the microphone and switches the 48V phantom power automatically on

For example, the cycle time setting is 30 minutes and the measurement starts at 7.50 a.m. -> the ﬁrst test cycle measures from 7.50 - 8.00 a.m. Thereafter a new test cycle starts automatically for 30 minutes. The 30-minute cycles repeat until the measurement is stopped.

The measurements in the synchronized repeat timer mode start exactly on the half or full hour in accordance with DIN 15905.

Preset Measurement Time

Adjustment of preset measurement time for single and repeat timer setting.

48V Phantom power is switched off.

Result Symbols / Capture

This ﬁeld offers two functions:

Symbols for measurement results •

Upper RTA parameter displayed as line.

Lower RTA parameter displayed as bargraph.

Sound Level Meter

Capture• One of the displayed RTA readings may be captured. Any measurement data can then be compared with this captured reference live on the XL2 Analyzer. For example, compare the RTA spectrum of the left and right speakers.

Select the parameter to be captured• . Conﬁrm with enter • Select the upper RTA parameter • Capt. Conﬁrm with enter •

 The lower RTA reading can be compared with the previ-

ously-captured reference data.

Measurement Result

Actual level result of the indicated frequency band. The cursor readout displays the center frequency and the level of the band pointed to by the arrow.

, to capture the reading.

and choose

Y-Scale setting

Select the Y-Axis with the rotary wheel • with enter

and conﬁrm

Select the zoom factor between • 20, 10, 5, 2.5 dB/div and conﬁrm with enter

. Scroll up and down with the rotary wheel • to select the Y-axis range. Conﬁrm with enter •

RTA Measurement Result

Real-time analyzer results in 1/1 octave or 1/3 octave band resolution. Adjust the resolution at

X-Scale setting

Toggles X-scale range between

20 Hz - 20 kHz RTA levels including wide band results

6.3 Hz - 8 kHz RTA levels including wide band results

Upper parameter displayed as line.

Lower parameter displayed as bargraph.

6.3 Hz - 20 kHz RTA levels

Select the X-Axis with the rotary wheel • and conﬁrm with enter

. Toggle with the rotary wheel • between the ranges. Conﬁrm with enter •

+ 263 hidden pages

Nti Audio XL2 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual