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Listen AmpConnect ISC Instruction Manual

Microphone and loudspeaker test interface with integrated sound card
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TM
AmpConnect ISC
Microphone and Loudspeaker Test Interface with Integrated Sound Card
Instruction Manual
PN: 8070 Rev 071312
PN: 80
Listen, Inc. 580 Harrison Ave, Suite 3W, Boston, MA 02118
© Copyright 2009-2011
© Copyright 2000-2010
Tel: (617) 556-4104
Fax: (617) 556-4145
Web: www.listeninc.com
Listen, Inc.
Listen, Inc.
Sales: sales@listeninc.com
Support: support@listeninc.com

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  • Page 1 AmpConnect ISC Microphone and Loudspeaker Test Interface with Integrated Sound Card Instruction Manual PN: 8070 Rev 071312 PN: 80 Listen, Inc. 580 Harrison Ave, Suite 3W, Boston, MA 02118 © Copyright 2009-2011 © Copyright 2000-2010 Tel: (617) 556-4104 Fax: (617) 556-4145 Web: www.listeninc.com...
  • Page 2 Rev Date 071312...

  • Page 3: Table Of Contents

    Listen Software License Agreement ........
  • Page 4 AmpConnect ISC Block Diagram ........

  • Page 5: Listen Software License Agreement

    WITHIN THIRTY (30) DAYS OF YOUR INVOICE DATE, AND YOU WILL RECEIVE A CREDIT OR A REFUND. The enclosed Software is provided to the purchaser of the Software ("End-User") by LISTEN, Inc., ("Licen- sor") for use only under the terms set forth in this Agreement. Licensor reserves any right not expressly granted to the End-User.
  • Page 6 U.S. Export Administration Act and its associated regulations, and may be subject to export or import regulations of other countries. End-User agrees to strictly comply with all such regulations and acknowl- edges that it has the responsibility to obtain licenses to export, re-export or import Software. AmpConnect ISC Instruction Manual Listen Software License Agreement...
  • Page 7 END-USER ACKNOWLEDGES THAT IT HAS READ THIS LICENSE, UNDERSTANDS IT, AND AGREES TO BE BOUND BY ITS TERMS AND CONDITIONS. Should you have any questions concerning this License, contact Licensor at the address set forth above. AmpConnect ISC Instruction Manual Listen Software License Agreement...
  • Page 8 LISTEN (30) LISTEN, Inc.( AmpConnect ISC Instruction Manual Listen Software License Agreement...
  • Page 9 “ ” www.listeninc.com/register <http://www.listeninc.com/register> LISTEN, Inc. LISTEN, Inc. 580 Harrison Ave., 580 Harrison Ave., Suite 3W, Suite 2A, Boston, MA 02118 Boston, MA 02118 AmpConnect ISC Instruction Manual Listen Software License Agreement...
  • Page 10 AmpConnect ISC Instruction Manual Listen Software License Agreement viii...

  • Page 11: Introduction

    AmpConnect ISC is fully controllable via SoundCheck which means that adjustments of parameters such as gain can be included in test sequences. AmpConnect ISC is easy to calibrate, easy to setup and is more immune to noise due to minimized connections. AmpConnect ISC can route/select all test signals, and contains an integral power amplifier to drive the device under test (or mouth simulator).

  • Page 12: Key Features

    Designed to operate in demanding production environments Speed Dual amplifier outputs allows the operator to test one speaker while loading another Signal routing and switching can be stored in a SoundCheck sequence to simplify test setup Introduction AmpConnect ISC Instruction Manual...

  • Page 13: Test Setup Comparison

    REMOVE COVER. NO USER-SERVICABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. Reference (Microphone) DUT (Microphone) PUSH PUSH ™ ISC AmpConnect Digital Back Panel USB 2.0 SCM Reference Mic Loudspeaker (DUT) Figure 1-2: AmpConnect ISC simplifies the setup AmpConnect ISC Instruction Manual Introduction...
  • Page 14 Reference (Microphone) DUT (Microphone) PUSH PUSH ™ ISC AmpConnect Back Panel Digital USB 2.0 SCM Reference Mic 1 Loudspeaker 1 (DUT) Loudspeaker 2 SCM Reference Mic 2 (DUT) Figure 1-3: Example of two speaker test setup Introduction AmpConnect ISC Instruction Manual...

  • Page 15: Installation

    SoundCheck 10.11 minimum (or SoundCheck ONE) is required in order to control AmpConnect ISC™ via USB The SoundCheck computer must have an available USB 2.0 connection Note: It is recommended that AmpConnect ISC be mounted in a ventilated rack mount enclosure for proper cooling. Software Installation Important! Make sure the SoundCheck USB hardware key is not connected to the computer.

  • Page 16: Audio Device Settings

    SoundCheck is available. Note: The mother board sound card should be set as the default play and record device. This will help prevent any “stray“ system sounds from being played through the SoundCheck audio device. Installation AmpConnect ISC Instruction Manual...
  • Page 17 4. Select the Playback tab and set the default device to the motherboard sound card 5. Select the Recording tab and set the default device to the motherboard sound card 6. Click OK and close the remaining Control Panel windows AmpConnect ISC Instruction Manual Installation...
  • Page 18 Installation AmpConnect ISC Instruction Manual...

  • Page 19: Hardware And Calibration

    Hardware and Calibration AmpConnect ISC acts as a complete audio interface for test and measurement with SoundCheck software. The Hardware Configuration in SoundCheck must be setup for use with AmpConnect. AmpConnect ISC Setup in Windows XP Due to a Windows XP issue with USB audio, the System Hardware Configuration for AmpConnect ISC must be set to 44.1 kHz, 16 bit.
  • Page 20 Hardware Configuration In order to control AmpConnect ISC from a SoundCheck sequence, it must be Enabled in the Hardware Editor. Enable - Select to allow control of AmpConnect ISC(s) in the sequence Add - Opens a selection window which allows the user to select a connected AmpConnect ISC.
  • Page 21 Calibration. AmpConnect ISC Hardware Configuration The AmpConnect ISC Hardware settings are included in the default steps with SoundCheck 10.x. SoundCheck 11 (and higher) will need to import the AmpConnect ISC settings as shown in Import Hardware Configuration on page 10.

  • Page 22: Soundcheck System Calibration

    Calibration for AmpConnect. (Channels that are greyed out do not apply to AmpConnect.) Click on a HW Channel item in the table to access the drop down menu to select the appropriate channel. The table in Figure 3-8 shows the complete list. Hardware and Calibration AmpConnect ISC Instruction Manual...

  • Page 23: Amplifier Calibration

    Amplifier Calibration The mono power amplifier in AmpConnect ISC can be calibrated for use in a SoundCheck sequence. Since the mono amp is switched to Outputs A or B, only one output needs to be calibrated. AmpConnect ISC Settings The Front Panel of AmpConnect ISC must be set as shown in Figure 3-8.
  • Page 24 Sound Pressure Level: 94.00 dB ± 0.20 dB Frequency: 1000 Hz ± 0.1% 4. Note the gain or attenuation value, in dB, from the AmpConnect ISC channel settings that the reference microphone is connected to. Enter this value in the Pre-Gain numeric field of the Calibration Step.

  • Page 25: Front Panel Functions

    AmpConnect ISC™ Figure 4-1: Front Panel AmpConnect ISC™ can be used as a stand-alone test and measurement interface. It can also be controlled by SoundCheck using Message Steps in a test sequence. The front panel LEDs show the settings for input and output channels as well as signal level and signal state.

  • Page 26: Panel Control

    The initial power up default settings from Listen, Inc., are those most commonly used for loudspeaker testing: Digital I/O: all Bits are Low (LEDs off).

  • Page 27: Input

    AmpConnect Bias voltage should be Off when connecting an external supply to an AmpConnect XLR input. Testing microphones that need 48V phantom power requires an external phantom power supply. Gain Gain is variable in steps from -20dB to +40 dB Input gains are independently variable AmpConnect ISC Instruction Manual Front Panel Functions...

  • Page 28: Output

    Route to either internal sound card input in order to test sound card connections and settings Cannot be routed to amplifier output Quiet: Output channel is defeated (All source LEDs are set to Off). If AmpConnect ISC is accidentally disconnected from USB or if the computer is shut off, AmpConnect ISC will automatically switch to Quiet.

  • Page 29: Rear Panel Connections

    XLR pin 1 is chassis ground XLR pin 2 is signal high (+), BNC center is signal high (+) XLR pin 3 is signal low (-), BNC case is signal low (-) Figure 5-2: XLR / BNC Inputs AmpConnect ISC Instruction Manual Rear Panel Connections...

  • Page 30: Dut (Microphone) Input

    Connects to a transducer via the binding post connectors. Note: There is only one, mono power amp channel in AmpConnect ISC. This amp channel can be switched to either Output A, Output B or A + B. Amplifier Output B Connects to a second transducer via the binding post connectors.

  • Page 31: Usb Control Via Soundcheck

    Digital I/O is only accessed by USB through SoundCheck. The following example shows how to use a Message Step in SoundCheck to control AmpConnect ISC. (AmpConnect ISC must be enabled in the Hardware Step. See Hardware Configuration on page 10.)

  • Page 32: Ampconnect Message Step

    “switch closure times” associated with external devices connected to the Digital IO of AmpConnect. Apply - Click Apply to switch AmpConnect ISC to the new settings from Configure AmpConnect without having to run the sequence. This is useful for testing the settings.
  • Page 33 Configure AmpConnect Click on Configure AmpConnect to set the front panel settings of AmpConnect ISC. Figure 6-5: AmpConnect ISC Message Step Read Settings - Allows the user to update the settings of the Message Step by Reading the current settings of the AmpConnect ISC Front Panel.

  • Page 34: Custom Step Conversion

    Custom Step Conversion SoundCheck 9 users will need to upgrade to SoundCheck 11.x (or later) to control AmpConnect ISC. The Custom Step from SoundCheck 9 will need to be re-created as a Message Step in SoundCheck 11.x and Please use the following procedure.
  • Page 35 Impedance measurement input in the SoundCheck sequence. Click Apply to send settings to the AmpConnect ISC unit. This allows the user to check the settings without having to run the sequence. Note that the software Control Panel for AmpConnect ISC may not show the changes.
  • Page 36 USB Control Via SoundCheck AmpConnect ISC Instruction Manual...

  • Page 37: Digital I/O Connections

    Lines for Bits 0 thru 7 have an internal 470 Ohm resistor in series with each When set to Read (configured as an input), the Bit is pulled high through an internal 100K resistor AmpConnect ISC Instruction Manual Digital I/O Connections...
  • Page 38 A single AmpConnect step can also be created to perform both operations simultaneously. Both Bit 0 and 1 set to Write (Output) Bit 0 and 1 set to High (LEDs On) Digital I/O Connections AmpConnect ISC Instruction Manual...
  • Page 39 Figure 7-3. External Switch Examples The DIO input of AmpConnect ISC can read external switch closures into a SoundCheck test sequence. Normally Closed Switch Digital I/O Bit 4 Example - High when switch is depressed...
  • Page 40 Configuration for sequence logic. See Step Configuration in the main SoundCheck Manual for more information. If the setting agrees with the actual status of the Input, the step will issue a PASS verdict. Digital I/O Connections AmpConnect ISC Instruction Manual...

  • Page 41: Test Connections And Procedures

    IEPE -20dB 1V Sine Level Level Channel 2 Enable Bias Gain Source Select Setup Setup Digital I/O Channel 1 AmpConnect ISC™ Front Panel CONTROL INPUT OUTPUT AMPLIFIER Bit 7 Bit 6 +40dB Bit 5 +30dB Reference Headphone Bit 4 +20dB...

  • Page 42: Two Loudspeaker Test

    1 Ohm reference resistor will reduce the power output by ¼ x 60 watts = 15 Watts, leaving 45 Watts available to drive the load). Also, because of AmpConnect ISC’s extra dissipated power internally, its upper operating temperature limit may be lowered.

  • Page 43: Microphone Test

    Channel 2 Figure 8-4: Microphone Test Layout The Microphone test setup in Figure 8-4 shows how AmpConnect ISC is setup with a DUT Mic. Reference Mic output set to Channel 1 Bias set to Voltage Gain set to +10dB DUT Mic output set to Channel 2...

  • Page 44: User Setup Notes

    Bit 2 Bit 1 Voltage -10dB Channel 1 Bit 0 IEPE -20dB 1V Sine Level Panel Level Channel 2 Enable Setup Bias Gain Setup Source Select Digital I/O Am pConnect ISC™ Channel 2 Test Connections and Procedures AmpConnect ISC Instruction Manual...

  • Page 45: Headphone Testing

    -10dB Channel 1 Bit 0 Panel Level IEPE -20dB Channel 2 1V Sine Level Enable Bias Gain Source Select Digital I/O Setup Setup AmpConnect ISC™ Channel 2 Settings Figure 9-1: Headphone Test With AmpConnect ISC AmpConnect Instruction Manual Headphone Testing...

  • Page 46: Required Changes

    AmpConnect ISC headphone amplifier to limit sound pressure levels. A normal power amplifier can output a voltage level that will damage most headphones if used at full gain.

  • Page 47: Ampconnect Front Panel Settings

    3. The Head and Torso Simulator (HATS) has both left and right ear simulators which need to be calibrated before measuring the headphones. (Refer to the HATS manual for further instructions on mounting a microphone calibrator on the artificial ears.) 4.

  • Page 48: Ampconnect Message Step

    AmpConnect Message Step AmpConnect ISC can be controlled with a Message Step in the SoundCheck test sequence. The example Figure 9-3 shows the settings used in this example. This is the first step in the sequence. All controls are the same as the front panel controls noted in AmpConnect Front Panel Settings on page 37, with the addition of the Headphone Monitor Control.

  • Page 49: Ampconnect Isc Block Diagram

    AmpConnect ISC Block Diagram Bias Ref Mic Input Gain: 0, +10 or +20dB -3dB Jumper Chan 1 Input Internal -3dB: 2Hz, Gain: -20, Sound Card Bias 20Hz, 0, +20dB DUT Mic 200Hz Input -3dB Jumper Gain: 0, +10 or +20dB...

  • Page 50: Block Diagram Explanations

    Block Diagram Explanations Signal routing controlled from AmpConnect ISC front panel or from SoundCheck Message Step. Ref and DUT Input signals routed to Internal Sound Card inputs Bias Ref Mic Input Gain: 0, +10 or +20dB -3dB Jumper Left Input...

  • Page 51: Internal Jumper Settings

    The 3dB Down Point of the Reference (J30) and DUT (J24) Inputs can be set. See Figure 10-2. 2 Hz - No Jumper (Default) 20 Hz - Jumper across 1 and 2 200 Hz - Jumper across 2 and 3 AmpConnect ISC Instruction Manual AmpConnect ISC Block Diagram...
  • Page 52 AmpConnect ISC Block Diagram AmpConnect ISC Instruction Manual...

  • Page 53: Specifications

    Gain: -20dB to +40dB in 10dB steps Maximum input at -20dB: 100V RMS Maximum input at +40dB: 100mV RMS IEPE Bias: 10mA, 20VDC (max) ECM / Electret Bias: 500mV - 12 VDC (via internal trim pot) through 2.2k Ohm AmpConnect ISC Instruction Manual Specifications...
  • Page 54 Outputs automatically disabled upon USB disconnect or PC shutdown Physical Without rack mounting flanges: 17 in. wide, 2-Unit (3-1/2 in.) high, 11 in. deep Weight: 7 lbs (3.2kgm) approx. Power: 85 - 264VAC 50/60 Hz, 150 Watts (max) Specifications AmpConnect ISC Instruction Manual...

  • Page 55: Index

    INDEX ................14 Level Message Step ..........21, 22, 36, 38 ........... 3 AmpConnect ISC Test Setup ..........14 Microphone Calibration AmpConnect Setup in Windows XP ........ 9 ....14 Microphone manufacturer’s specifications ............13 Amplifier Calibration Monitor Control ...............38 ..........7 Audio Devices - Windows 7 Audio Devices - Windows XP ..........
  • Page 56 INDEX AmpConnect ISC Instruction Manual...

  • Page 57: Contact Information

    Rev Date 071312 Contact Information Contact the Listen office at 617-556-4104, Monday thru Friday, between 9 AM and 5 PM EST. or email: Sales - sales@listeninc.com Technical Support - support@listeninc.com Useful links Listen Website: www.listeninc.com/ User Forum: www.listeninc.com/community/ FAQ page can be found at: www.listeninc.com/community/...

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