Virtins Vt rta-168a/b User manual

VT RTA-168A/B Manual Rev. 1.5

Virtins Technology

VT RTA-168A/B Manual

A Real Time Acoustic Analyzer, Sound Level Meter, Distortion Analyzer,

Polarity Tester, …

Note: VIRTINS TECHNOLOGY reserves the right to make modifications to this manual at any time without

notice. This manual may contain typographical errors.

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TABLE OF CONTENTS

1 INSTALLATION AND QUICK START GUIDE..........................................................................................3

1.1 PACKAGE CONTENTS....................................................................................................................................3

1.2 HARDWARE CONNECTION DIAGRAM............................................................................................................4

1.3 HARDWARE DRIVER INSTALLATION.............................................................................................................5

1.4 MULTI-INSTRUMENT SOFTWARE INSTALLATION AND CONFIGURATION.......................................................6

1.4.1 Install Multi-Instrument.......................................................................................................................6

1.4.2 Start Multi-Instrument..........................................................................................................................6

1.4.3 Configure Multi-Instrument.................................................................................................................8

1.5 INPUT OF SOUND LEVEL CALIBRATION DATA AND ADJUSTMENT OF INPUT GAIN......................................10

1.5.1 Under Windows XP or a Windows Version Before XP.....................................................................11

1.5.2 Under Windows Vista........................................................................................................................11

1.5.3 Under Windows 7 ..............................................................................................................................12

1.5.4 Under Windows 8/8.1/10 ...................................................................................................................14

1.5.5 Adjustment of Input Gain via Hardware Gain Switch .......................................................................15

1.5.6 0dB Reference Vr ..............................................................................................................................16

1.6 MICROPHONE FREQUENCY COMPENSATION ...............................................................................................16

1.7TWENTY MOST FREQUENTLY USED MEASUREMENT SETTINGS .................................................................18

1.8 MORE ACOUSTIC ANALYSIS FUNCTIONS AVAILABLE IN MULTI-INSTRUMENT PRO OR ABOVE..................21

1.9 LIST OF AUDIO TEST WAV FILES (AUDIOTESTCD.ZIP) .............................................................................21

1.10 OPERATION NOTES ...................................................................................................................................23

2 SPECIFICATIONS.........................................................................................................................................24

2.1 VT RTA-168A/B HARDWARE CONFIGURATION ........................................................................................24

2.2 OVERALL VT RTA-168A/B SPECIFICATIONS.............................................................................................24

2.3 MEASUREMENT MICROPHONE ECM999 SPECIFICATIONS (FOR VT RTA-168A)........................................24

2.4 MEASUREMENT MICROPHONE EMM-6 SPECIFICATIONS (FOR VT RTA-168B)..........................................26

2.5 VT XLR-TO-USB PRE SPECIFICATIONS .....................................................................................................27

2.6 MULTI-INSTRUMENT SOFTWARE SPECIFICATIONS......................................................................................28

3 MULTI-INSTRUMENT SOFTWARE LICENSE INFORMATION ........................................................37

3.1 LICENSE TYPES...........................................................................................................................................37

3.2 LICENSE UPGRADE FROM ONE LEVEL TO ANOTHER...................................................................................37

3.3 SOFTWARE UPGRADE IN THE SAME LICENSE LEVEL...................................................................................37

4 WARRANTY...................................................................................................................................................37

5 DISCLAIMER.................................................................................................................................................38

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1 Installation and Quick Start Guide

1.1 Package Contents

A standard VT RTA-168A/B Package contains the following items:

1) Measurement microphone and its accessories (a windshield, a microphone clip and stand)

2) XLR-to-USB sound card

3) USB cable (1.5 m)

4) CD (containing the copy-protected Multi-Instrument Software)

The latest software can always be downloaded from www.virtins.com/MIsetup.exe.

5) USB hardkey (containing a Multi-Instrument Standard License)

6) Audio Test WAV files (containing a list of audio test tones and noises)

Measurement Microphone

Windshield

Microphone Clip and Stand

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They can be downloaded at: www.virtins.com/AudioTestCD.zip and then burnt into a CD

or saved into a USB memory stick. They can also be generated directly from the Signal

Generator of Multi-Instrument.

7) 1/8” TRS cable (1.8m)

8) Black Soft Pouch Case

9) Unique Sound Level Calibration Data (in CD)

10) Unique Microphone Calibration Data (only provided in RTA-168B, in CD)

1.2 Hardware Connection Diagram

There are two connection methods, with or without the XLR cable between the measurement

microphone and the XLR-to-USB sound card.

Connection Method 1 (without XLR cable):

Unscrew the XLR shield on the XLR-to-USB sound card and connect the sound card directly

to the measurement microphone. Then connect the corresponding ends of the USB cable to

the XLR-to-USB sound card and the PC’s USB port. When this is complete, the red LED

light will light up indicating that it is receiving power.

without XLR cable

Connection Method 2 (with XLR cable):

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The XLR cable is not provided in the product package. So you need to find an XLR cable

with a female connector at one end and a male connector at the other end.

Plug the female end of the XLR cable into the measurement microphone and the male end

into the XLR-to-USB sound card. Then connect the corresponding ends of the USB cable to

the XLR-to-USB sound card and the PC’s USB port. When this is complete, the red LED

light will light up indicating that it is receiving power.

with XLR cable

Software Activation

The USB hardkey needs to be plugged into any USB port of the PC in order to activate the

Multi-Instrument software. Otherwise the software will run under the 21-day fully functional

free trial mode before the trial period expires.

Test Signal Generation

You can generate the test signals from the Signal Generator of Multi-Instrument. The XLR-

to-USB sound card does not have any audio output channels, so you need to use your

computer’s built-in sound card or any other sound card for audio test signal output. The

quality of the test signals would depend on the sound card used. Generally, the built-in sound

card of a laptop is good enough for generating quality test signals for magnitude frequency

response measurement of an audio system.

The 1/8” TRS cable provided in the product package can be used to connect the sound card’s

audio output (e.g. Line Out, Headphone, Speaker) to the AUX input of the audio system

under test.

Alternatively, you can play the test signals from an audio CD or a memory stick.

1.3 Hardware Driver Installation

No hardware driver installation is required. It is supported by Windows natively.

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1.4 Multi-Instrument Software Installation and Configuration

Multi-Instrument is a powerful multi-function virtual instrument software. It supports a

variety of hardware ranging from sound cards which are available in almost all computers to

proprietary ADC and DAC hardware such as NI DAQmx cards, VT DSOs and so on. It

consists of multiple test instruments such Oscilloscope, Spectrum Analyzer, and Multimeter,

etc.

1.4.1 Install Multi-Instrument

Insert the Multi-Instrument installation CD into your computer’s CD-ROM drive and follow

the instruction on the screen to install the Multi-Instrument software. The installation file

can also be downloaded from www.virtins.com/MIsetup.exe.

1.4.2 Start Multi-Instrument

To start Multi-Instrument, on the Windows desktop, select [Start]>[All Programs]>[Multi-

Instrument]>[VIRTINS Multi-Instrument], or simply double click the MI icon.

If the software is started for the very first time after installation, it will prompt the user to

select a default device (see figure below). Select VT RTA-168A or VT RTA-168B according

to the hardware device to be used.

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The default device can also be changed later via [Setting]>[ADC Device], [Setting]>[DAC

Device], and [Setting]>[Configure Hot Panel Setting Toolbar], or simply [Setting]>[Restore

to Factory Default]. However, if [Restore to Factory Default] command is executed, all

calibration data entered manually via [Setting]>[Calibration] after software installation

will be reset to the default values of the selected product. To avoid the loss of the

manually entered calibration data, you can save them as a calibration file first.

Otherwise, you will have to enter the unique calibration data that come with the

product package again.

After the default device is selected, the software will prompt the user to select a default color

scheme (Skin). The default skin can also be changed later via [Setting]>[Display].

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The main window of the software will open after the above skin selection. The following

figure shows a typical screen layout (obtained by clicking the “OCT3” button in the Hot

Panel Setting Toolbar after the launch of the software). Please refer to the software manual

for detailed functions of the software. The software manual can be accessed via [Start]>[All

Programs]>[Multi-Instrument]>[VIRTINS Multi-Instrument Manual] (in PDF format) or

[VIRTINS Multi-Instrument Help] (in HTML format) on Windows Start menu, or

[Help]>[Software Manual] or F1 inside the software.

1.4.3 Configure Multi-Instrument

In Multi-Instrument, the menu items are enabled/disabled based on context. Many menu

items are disabled when the Oscilloscope or the Signal Generator is running. To do the

configuration, stop the oscilloscope first by pressing the green button at the upper left corner

of the screen (see figure below). The button will turn red once the Oscilloscope is stopped.

1.4.3.1 Configure Sound Recording Devices for Multi-Instrument

Go to [Setting]>[ADC Device], and choose “USB Audio CODEC” , “Microphone (USB

Audio CODEC)”, “Line (USB Audio CODEC)” and the like in the “Device No.” field (see

figure below). This is to configure the XLR-to-USB sound card as the sound recording

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device for the software. Note that the displayed name of the XLR-to-USB sound card may

vary a bit under different Windows versions. The “Device Model”field must be set to

“Sound Card MME”.

Under Windows XP or a Windows Version Before XP

Under a Windows Version after XP

Now, if you start the oscilloscope by pressing the red button at the upper left corner of the

screen, and then talk before the measurement microphone, you should be able to see your

“voices” in the Oscilloscope and Spectrum Analyzer.

1.4.3.2 Configure Sound Playback Devices for Multi-Instrument

The XLR-to-USB sound card does not have any audio output channels, but you can use your

computer’s built-in sound card or any other sound card for audio test signal output, if you

want to use the Signal Generator in Multi-Instrument to generate the test signals. To

configure the sound card for the Signal Generator, go to [Setting]>[DAC Device] and choose

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the corresponding sound card’s name in the “Device No.” field. By default, Multi-

Instrument will use the computer’s built-in sound card for signal output. Again, the “Device

Model”field must be set to “Sound Card MME”.

Now, if you press the Signal Generator button (see figure above), the Signal Generator panel

will be opened (see figure below). Press the red triangle button at the upper right corner of

the Signal Generator panel, you should hear a 1kHz test tone from the speaker or earphone

connected to the selected playback sound card. Press it again to stop the sound.

1.5 Input of Sound Level Calibration Data and Adjustment of Input Gain

Sound Level Calibration is not required for those relative measurements such as frequency

response, THD, THD+N, IMD, etc.. It is required only if you want to measure the absolute

sound level.

The measurement microphone and the XLR-to-USB sound card have been calibrated in pair

in the factory. The sound level calibration data are provided in a separate sheet inside the

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product package. Please refer to the calibration data sheet provided and enter the calibration

data in the respective highlighted fields in the Calibration Setting dialog box (see figures

below). Note that different calibration data are required for different Windows versions. The

Calibration Setting dialog box is opened via [Setting]>[Calibration] in Multi-Instrument.

You can adjust the sound level measurement range by adjusting the input gain of the XLR-

to-USB sound card through its hardware gain switch and/or the software.

1.5.1 Under Windows XP or a Windows Version Before XP

Input of the Sound Level Calibration Data

Note the calibration data in the following figure are examples only, you should enter the

actual calibration data provided inside the product package.

Adjustment of Input Gain via Software

Under Windows XP or a Windows version before XP, the input gain of the XLR-to-USB

sound card is not adjustable. Neither the Recording Control under Windows Control Panel

nor Multi-Instrument can adjust the input gain.

1.5.2 Under Windows Vista

Input of the Sound Level Calibration Data

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Note the calibration data in the following figure are examples only, you should enter the

actual calibration data provided inside the product package.

Adjustment of Input Gain via Software

Under Windows Vista, the input gain of the XLR-to-USB sound card is not adjustable in the

Sound Recording Tab under Windows Control Panel. However, you can adjust it by clicking

the respective radio buttons beside the “Mic 100%”, “Mic 80%”, “Mic 60%”, “Mic 40%”

and “Mic 20%” in the above figure. It should be noted that the selection status of these radio

buttons does not necessarily reflect the actual input gain (For example, when you open the

Calibration Setting dialog box, if the selected radio box is “Mic 80%”, it does not necessarily

mean the current input gain is set at 80%.). The actual input gain is reflected by the “Mixer”

status under the “Sound Card Input Status” in the above figure. You can press the “Refresh”

button to make sure the status display has been refreshed.

1.5.3 Under Windows 7

Input of the Sound Level Calibration Data

Note the calibration data in the following figure are examples only, you should enter the

actual calibration data provided inside the product package.

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Adjustment of Input Gain via Software

Similar to Windows Vista, you can adjust the input gain by clicking the respective radio

buttons beside the “Mic 100%”, “Mic 80%”, “Mic 60%”, “Mic 40%” and “Mic 20%” in the

above figure. It should be noted that the selections status of the radio button does not

necessarily reflect the actual input gain (For example, when you open the Calibration Setting

dialog box, if the selected radio box is “Mic 80%”, it does not necessarily mean the current

input gain is set at 80%.). The actual input gain is reflected by the “Mixer” status under the

“Sound Card Input Status” in the above figure. You can press the “Refresh” button to make

sure the status display has been refreshed.

Unlike Windows Vista, the input gain is adjustable in the Sound Recording Tab under

Windows Control Panel. You can access the Sound Recording Tab by clicking the “Windows

Recording Control” button (see figure below) in Multi-Instrument.

This will bring up the Sound Recording Tab (see left part of the figure below).

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If you right click “Microphone (USB Audio CODEC)” and select “Properties”, the right part

of the figure above will be shown. You can then adjust the input gain through the

“Microphone” slider.

1.5.4 Under Windows 8/8.1/10

Input of the Sound Level Calibration Data

Note the calibration data in the following figure are examples only, you should enter the

actual calibration data provided inside the product package.

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Adjustment of Input Gain via Software

Same as Windows 7

1.5.5 Adjustment of Input Gain via Hardware Gain Switch

You can also adjust the input gain by changing the switch position on the XLR-to-USB

sound card. You can change among three positions: HI, MED, LO (see figure above). The

MED and LO positions provide roughly 5dB (×1.778279) and 9.56dB (×3.006076)’

attenuation with respect to the HI position (×1). The accurate gain differences are provided in

the sound level calibration data in the product package.

If the input gain is adjusted through the software, the software will automatically take the

change of the input gain into account. However, if the input gain is adjusted through the

hardware gain switch, you will have to change the “Probe” switch position (see figure below)

accordingly in Multi-Instrument’s toolbar to account for the change. Note: The hardware

gain switch positions: HI, MED and LO correspond to “HI”, “MED” and “LO” in the

“Probe” switch position combo box respectively. For example, if the hardware gain switch is

at LO, you must choose “LO” in the “Probe” switch position combo box.

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1.5.6 0dB Reference Vr

The “0dB Reference Vr”in the Calibration Setting dialog box is used to finally calibrate the

input voltage to dBSPL. The input voltage here should be considered as a relative value as

the actual input is not a voltage but a sound pressure. The “0dB Reference Vr”is the

parameter to be recalibrated if a sound level recalibration is necessary. To do the

recalibration, simply enter the actual sound level value into the “Actual Value”edit box and

the measured sound level value into the “Read Value”edit box, and then press the

“Calculate”button once.

1.6 Microphone Frequency Compensation

The measurement microphone in RTA-168 series has an extremely flat frequency response in

the audio frequency range. Generally, there is no need to compensate for the microphone

frequency response. However, a higher degree of accuracy can be achieved if the

microphone comes with a frequency response file or a frequency compensation file. The

difference between these two files is the sign of the gain values (in dB). For example, a gain

of 3dB in a frequency response file should have a gain of -3dB in its equivalent frequency

compensation file.

The microphone ECM999 in RTA-168A does not come with a calibration file and thus no

frequency compensation is required.

The microphone EMM-6 in RTA-168B comes with an individually calibrated frequency

compensation file RTA.fcf. This file is located in the CD directory “\Microphone

Frequency Compensation File”. Please copy this file to the “\fcf”subdirectory under

the root directory of Multi-instrument in the hard disk (if the file already exists,

overwrite it), so that you can use it later. This file is also used by the twenty default panel

settings configured in the Hot Panel Setting Toolbar (The third toolbar from the top).

You can load the frequency compensation file by right clicking anywhere within the

Spectrum Analyzer window and selecting [Spectrum Analyzer Processing]> “Intra-Frame

Processing”> “Compensation 1” and load that frequency compensation file (see figure

below). If you want to apply it to the twenty most frequently used panel settings in the Hot

Panel Setting Toolbar, you will need to configure and save the corresponding panel setting

files one by one. Luckily, this has already been done for the twenty default panel settings.

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The above frequency compensation file RTA.fcf is actually converted from the original

calibration file supplied by the manufacturer of EMM-6. It is also possible to directly use

EMM-6’s original calibration file without conversion. To do that, simply select “Original

Frequency Response File (*.txt)”instead of “Frequency Compensation File (*.fcf)”as the

file filter in the following file selection dialog box, and then select the original calibration file.

The original calibration file can also be found in the CD directory “\Microphone

Frequency Compensation File”. Its file name is something like xxxxxx.txt where xxxxx

is the serial no. labelled on the EMM-6 microphone body.

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1.7 Twenty Most Frequently Used Measurement Settings

Multi-Instrument bundled with VT RTA-168 comes with many pre-configured panel setting

files. This saves you time to configure various parameters for some frequently performed

measurements by yourself. You can load these panel setting files via [Setting]>[Load Panel

Setting]. Furthermore, 20 most frequently used panel setting files are pre-configured in the

Hot Panel Setting Toolbar (The third toolbar from the top). You can load one of them by a

single mouse click. These 20 measurement settings are:

(1) Home: Default Setting

The factory default panel setting. It is equivalent to the [File]>[New] command.

(2) OCT1: 1/1 Octave Analysis (Avg. 10)

Pink noise will be generated by pressing the start button of the Signal Generator. The pink

noise will be injected into the DUT (Device Under Test), and the response of the DUT will

be captured and analyzed by the Oscilloscope and Spectrum Analyzer. A flat curve in the

Spectrum Analyzer would indicate a flat magnitude frequency response of the DUT. The

equivalent continuous sound level in dB will be displayed in the Multimeter window.

(3) OCT3: 1/3 Octave Analysis (Avg. 10)

Same as OCT1, but with a finer frequency resolution.

(4) OCT3ppn: 1/3 Octave Analysis

Same as OCT3, but periodic pink noise instead of ordinary (non-periodic) pink noise is used

as the stimulus. One advantage of using periodic pink noise is that its spectrum is ideally flat

under octave analysis even without inter-frame averaging.

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(5) Polarity: Speaker, Microphone, Amplifier Polarity Tester with Crest Factor Check

A polarity test signal will be generated by pressing the start button of the Signal Generator.

Point the microphone close to the center of the speaker under test along its axis, and observe

the polarity of the captured pulse in the oscilloscope window. If the pulse goes positive

initially, then the polarity of the speaker under test is positive, and vice versa.

Positive Negative

(6) THD: THD,THD+N,SNR,SINAD,Noise Level, ENOB (Avg. 10 )

A 1 kHz (to be precise, a frequency very close to 1 kHz) sine wave will be generated by

pressing the start button of the Signal Generator. The sine wave will be injected into the DUT

(Device Under Test), and the response of the DUT will be captured and analyzed by the

Oscilloscope and Spectrum Analyzer. All the above parameters of the DUT will be measured

and displayed. This panel setting should be used only if the same sound card is used for

signal input and output.

(7) THDcd: THD,THD+N,SNR,SINAD,Noise Level, ENOB (Avg. 10 )

A 1 kHz sine wave will be generated by pressing the start button of the Signal Generator. The

sine wave will be injected into the DUT (Device Under Test), and the response of the DUT

will be captured and analyzed by the Oscilloscope and Spectrum Analyzer. All the above

parameters of the DUT will be measured and displayed. This panel setting should be used if

different sound cards are used for signal input and output, such as the case of RTA-168. It

should also be used if the 1 kHz test tone is played from an audio CD or a memory stick.

(8) IMDsmp: IMD SMPTE (60 Hz + 7 kHz, 4:1) (Avg. 10)

A 60 Hz and a 7 kHz sine waves mixed at an amplitude ratio of 4:1 will be generated by

pressing the start button of the Signal Generator. The mixed signals will be injected into the

DUT (Device Under Test), and the response of the DUT will be captured and analyzed by the

Oscilloscope and Spectrum Analyzer. The SMPTE IMD value of the DUT will be measured

and displayed.

(9) IMDdin: IMD DIN (250 Hz + 8 kHz, 4:1) (Avg. 10)

A 250 Hz and a 8 kHz sine waves mixed at an amplitude ratio of 4:1 will be generated by

pressing the start button of the Signal Generator. The mixed signal will be injected into the

DUT (Device Under Test), and the response of the DUT will be captured and analyzed by the

Oscilloscope and Spectrum Analyzer. The DIN IMD value of the DUT will be measured and

displayed.

(10)IMDccif: IMD CCIF2 (19 kHz + 20 kHz, 1:1) (Avg. 10)

A 19 kHz and a 20 kHz sine waves mixed at an amplitude ratio of 1:1 will be generated by

pressing the start button of the Signal Generator. The mixed signal will be injected into the

DUT (Device Under Test), and the response of the DUT will be captured and analyzed by the

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Oscilloscope and Spectrum Analyzer. The CCIF2 IMD value of the DUT will be measured

and displayed.

(11)FRwhite: Magnitude Frequency Response (White Noise, Avg. 30)

White noise will be generated by pressing the start button of the Signal Generator. The white

noise will be injected into the DUT (Device Under Test), and the response of the DUT will

be captured and analyzed by the Oscilloscope and Spectrum Analyzer. The curve in the

Spectrum Analyzer indicates the magnitude frequency response of the DUT.

(12)FRpwn: Magnitude Frequency Response (Periodic White Noise)

Periodic white noise will be generated by pressing the start button of the Signal Generator.

The periodic white noise will be injected into the DUT (Device Under Test), and the

response of the DUT will be captured and analyzed by the Oscilloscope and Spectrum

Analyzer. The curve in the Spectrum Analyzer indicates the magnitude frequency response

of the DUT. One advantage of using periodic white noise is that its spectrum is ideally flat

even without inter-frame averaging.

(13)FRswLin: Magnitude Frequency Response (Frequency Sweep, Linear)

A 0.68266667-second 20Hz-to-20kHz linear frequency swept sine wave will be generated by

pressing the start button of the Signal Generator. The signal will be injected into the DUT

(Device Under Test), and the response of the DUT will be captured by the Oscilloscope and

Spectrum Analyzer. The curve in the Spectrum Analyzer indicates the magnitude frequency

response of the DUT. Note that you will need to adjust the trigger level so that the

Oscilloscope will be triggered just upon the start of the sweep.

(14)FRswLog: Magnitude Frequency Response (Frequency Sweep, Log)

A 0.68266667-second 20Hz-to-20kHz logarithmic frequency swept sine wave will be

generated by pressing the start button of the Signal Generator. The signal will be injected into

the DUT (Device Under Test), and the response of the DUT will be captured by the

Oscilloscope and Spectrum Analyzer. The curve in the Spectrum Analyzer indicates the

magnitude frequency response of the DUT. Note that you will need to adjust the trigger level

so that the Oscilloscope will be triggered just upon the start of the sweep.

(15)FRmt: Magnitude Frequency Response (MultiTone, 31 1/3 Octave Bands)

A multitone consists of 31 1/3 octave band center frequencies from 20 Hz to 20kHz will be

generated by pressing the start button of the Signal Generator. The signal will be injected into

the DUT (Device Under Test), and the response of the DUT will be captured by the

Oscilloscope and Spectrum Analyzer. The curve in the Spectrum Analyzer indicates the

magnitude frequency response of the DUT.

(16)sLeq: Short Equivalent Continuous Sound Level (Short Leq, 125ms)

This panel setting will display the short equivalent continuous sound level. The value is time-

averaged over continuous 125 ms.

(17)sLeqA: Short Equivalent Continuous Sound Level (Short Leq, 125ms) (A-Weighted)

This panel setting will display the A-weighted short equivalent continuous sound level. The

value is time-averaged over continuous 125 ms.

(18)sLeqC: Short Equivalent Continuous Sound Level (Short Leq, 125ms) (C-Weighted)

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