APx511 hearing instrument analyzer Installation Instructions, Specifications, and Getting Started Guide model APx511 Requires APx500 v 3.3 or later.
Copyright © 2011–2013 Audio Precision, Inc. All rights reserved. Printed in the United States of America. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without permission in writing from the publisher. Audio Precision, AP, and APx are trademarks of Audio Precision, Inc. Windows™ is a trademark of Microsoft Corporation.
Documentation and Support This booklet contains safety information, installation instructions and full specifications for the Audio Precision APx511 hearing instrument analyzer. A Getting Started chapter shows you basic interconnection diagrams and an introduction to controlling the APx511 with your automation software. ap.com Visit the Audio Precision Web site at ap.com for APx support information. APx resources are available at ap.com/downloads/apx.
Safety Safety Information Do NOT service or repair this equipment unless properly qualified. Servicing should be performed only by a qualified technician or an authorized Audio Precision distributor. Do NOT defeat the safety ground connection. This equipment is designed to operate only with an approved threeconductor power cord and safety grounding. Loss of the protective grounding connection can result in electrical shock hazard from the accessible conductive surfaces of this equipment.
Chapter 1: Safety create safety hazards. Using this product in a manner not specified by Audio Precision can result in a safety hazard. This product is for indoor use—Installation Category II, Measurement Category I, pollution degree 2. To clean the enclosure of this product, use a soft cloth or brush to remove accumulated dust. A mild detergent may be used to remove remaining dirt or stains. Do not use strong or abrasive cleaners. Wipe all surfaces with a damp cloth.
Chapter 1: Safety APx511 Safety 3
4 APx511 Installation
Installation Software The APx511 hearing instrument analyzer system uses the award-winning APx500 measurement software, whether using the GUI in the foreground, or controlling APx500 in the background using the API. This is the same software used in the APx525and APx585 analyzer families.
Chapter 2: Installation APx500 is data intensive and it is recommended that other data-intensive applications not be run concurrently. This includes Audio Precision’s AP2700, APWIN or ATS. Installation To install the measurement software, insert the APx500 CDROM into the optical drive on the PC and follow the instructions in the installation dialog. NOTE: You must have local administrator rights to install APx500 software.
Chapter 2: Installation USB ports directly connected to the PC motherboard, typically at the rear of the PC. Connect the APx511 mains power cord to the instrument and to a source of ac mains power. See Setting up the hardware below for more information about mains connections. Turn the instrument on by rocking the mains power switch up to ON ( | ). The mains power switch is located in the power entry module on the rear of the APx511.
Chapter 2: Installation The mains power switch is to the left. To open the power entry module, refer to Figure 3 and proceed as follows: Checking the mains supply voltage configuration The white plastic voltage indicator pin protrudes through one of the four labeled holes in the module cover to indicate the selected input voltage. Figure 2 shows the pin in the second position, indicating 120 V. Check to see that the indicated voltage matches your mains supply voltage.
Chapter 2: Installation Changing the Mains Supply Voltage Configuration • Open the Power Entry Module as described above. • The voltage selector card is a small circuit board fitted with a white plastic indicator pin, installed in a housing on the right side of the Power Entry Module as shown in Figure 4. Pull the voltage selector card straight out of the housing, using narrow pliers to grab the card. Do not use the indicator pin as a handle. connector.
Chapter 2: Installation Fuse information The power entry module accommodates two fusing arrangements, as illustrated in Figure 6. 100/120 VAC operation The 100/120 VAC fusing arrangement uses a single type 3AG (0.25" x 1.25") slo-blo fuse. Audio Precision recommends only the following replacement fuse: • 1 each Littelfuse 313 Series, 800 mA 3AG 250 V sloblo glass fuse. 230/240 VAC operation The 230/240 VAC fusing arrangement uses two 5 x 20 mm IEC-approved type T fuses.
Specifications APx511 hearing instrument analyzer with APx500 v3.3 or higher measurement software March 2013 NP0020.
Characteristic Specifications Supplemental Information White (<5 Hz to 0.45*SR), Pink (<10 Hz to 0.45*SR), IEC 60268-1 or BS EN 50332-1 0 to 16.12 Vpp Amplitude calibration is approximate Noise Characteristics Shape Amplitude Range IMD Test Signals SMPTE & MOD LF Tone Range HF Tone Range Mix Ratio (LF:HF) Amplitude Range Amplitude Accuracy Residual IMD1,2,3 100 Hz to 1 kHz 2 kHz to 10 kHz 10:1, 4:1 or 1:1 0 to 16.12 V pp, speaker output; 0 to 310 mA pp, telecoil output. ±0.06 dB [±0.70%] ≤0.
Characteristic Specifications Supplemental Information speaker output current limit typically 1.5 A peak min Max Output Current ANALOG ANALYZER Number of Channels 1 auto-ranging. Maximum Rated Input 48 V pp, 24 V dc Max ADC sample rate = 192 kS/s Input Impedance Unbalanced 100 k || 230 pF to BNC shield Input Coupling AC Input Ranges 250 mV rms to 80 V rms, 10 dB steps BNC shield to instrument chassis ground. Typically <0.
Characteristic Specifications Supplemental Information THD+N Measurement (Microphone, Speaker Voltage, Telecoil Current) Fundamental Range Measurement Range Accuracy Residual THD+N1,2 100 Hz to 20 kHz 0 to 100% ±0.5 dB (–80 dB + 1.4 µV), 20 kHz BW Microphone, speaker and telecoil Level & THD+N Filters High-Pass Low-Pass4 5 Hz to 500 Hz, or None 2.
Characteristic Specifications Supplemental Information 100 Hz to 20 kHz ±0.0003% [3 ppm] 6 digits Vin must be 5 mV. 0.25 V to 80 V, 10 dB steps ±24 Vdc maximum in 25 V range Frequency Measurement Range Accuracy Resolution DC Voltage Measurement Input Ranges Accuracy 250 mV and 800 mV ranges 2.5 V to 80 V ranges ±(0.7% reading + 1 mV) ±(0.7% reading + 0.
Characteristic Specifications Supplemental Information GENERAL/ENVIRONMENTAL Power Requirements 100, 120, 230 or 240 Vac, 50–60 Hz, with safety ground via approved power cord, 75 VA max. Typical operating range is 90–110 Vac (100V), 108–132 Vac (120V), 198–242 Vac (230V), or 216–264 Vac (240V).
Characteristic Specifications Supplemental Information Notes to Specifications 1. 2. 3. 4. System specification including contributions from both generator and analyzer. Generator-only and/or analyzeronly contributions are typically less. Generator load must be ≥ 8 (speaker output), or ≤ 4 telecoil output for specified performance. Analyzer input must be ≥ 150 mV for specified performance. Analyzer set to measure “d2+d3” IMD products for MOD and DFD modes.
Characteristic 18 Specifications Supplemental Information APx511 Specifications
Getting Started Guide Overview The APx511 is an analog-only audio analyzer with connectivity and features specifically designed to test hearing instruments. The front panel provides 5 LED indicators, and the rear panel provides all the audio, control and mains power connections, and the mains power switch. Hearing instrument testing is typically accomplished using a test chamber such as the Interacoustics TBS25.
Chapter 4: Getting Started Guide Power Speaker Tele-coil Battery Mic Front Panel Indicators Rear Panel Connections There are 5 LED indicators on the APx511 front panel. From left to right, these are: All connections to and from the APx511 are provided on the rear panel. From left to right these are: POWER This indicator is lit when mains power is applied. Power Input Module The mains switch, the mains power input and mains line fusing are provided in the module.
Chapter 4: Getting Started Guide Power Input Module Ground Lug Software Options Aux Control In Aux Control In Aux Control (sometimes referred to as GPIO) provides the capability to communicate with external devices by transmitting and receiving control commands. The APx511 supports Aux Control Input only. Aux Control In is a general-purpose 8-bit digital port, available on a 9-pin D-Sub connector. Pin 9 is the common (ground) connection; pins 1–8 are numbered to correspond with the Aux Control bits 1–8.
Chapter 4: Getting Started Guide Basic Test configuration Hearing instrument testing is typically performed in an acoustically isolated test chamber, which is fitted with a loudspeaker, a telecoil, a battery simulator and a measurement microphone with a 2 cc acoustic coupler. The APx511 is shipped with either a DB-15 to DB-15 cable, or a DB-15 breakout cable, selected at time of purchase. Use this cable to connect the elements in your test chamber to the APx511 as shown in this diagram.
Chapter 4: Getting Started Guide Accessories • Microphone calibrator, 0.5 in fitting • Calibrator adapter, 0.5 in. to 14 mm • APx511 Self test kit Measurement microphone, dummy mic, HA-1 and HA-2 couplers. Audio Precision offers these accessories for the APx511: • Measurement Microphone, 0.5 in. diameter. • Measurement Microphone, 14 mm diameter. • Microphone coupler, 2 cc, HA-1-05, 0.5 in. • Microphone coupler, 2 cc, HA-2-05, 0.5 in, with BTE tubes.
Chapter 4: Getting Started Guide APxHia We have included a program called APxHia to illustrate the hearing instrument testing functions available in the .NET function library. Note that APxHia is provided for illustrative purposes only. For production testing a user-created program in C#.NET, VB.NET or LabVIEW should be created to address the API. See page 29. The graphs displayed in APxHia are images. To access the graph data, go to the corresponding graph in the APx500 user interface.
Chapter 4: Getting Started Guide From the APxHia View menu, choose APx500 to make APx500 visible. If you are familiarizing yourself with the APx511, it can be instructive to watch the APx500 displays while the testing progresses. You can also choose to turn the APx signal monitors ON or OFF from the View menu. The signal monitors consume considerable PC resources, and you may find that your system is more responsive with the monitors off. Calibrating the microphone phone calibrator device.
Chapter 4: Getting Started Guide Leveling the test chamber This tool will set chamber acoustic output to a calibrated level, and equalize the analyzer output to compensate for loudspeaker response. If no leveling data is on file for this system, the Leveling Date field will read “No Leveling Data.” Leveling uses the regulation function in APx. Put the microphone on the chamber test point spot. Fit the dummy mic to the coupler to maintain a constant acoustic space. Close and seal the chamber. Click Level.
Chapter 4: Getting Started Guide Running the standard tests Place the DUT (with the battery simulator installed), the measurement microphone/coupler combination and the dummy mic in the chamber. Follow the prompts in the measurements to set the DUT volume control to the correct level. ANSI S3.22 / IEC60118-7 Hearing instrument testing is defined in two standards: ANSI S3.22 from the American National Standards Institute, based in Washington, D.C.
Chapter 4: Getting Started Guide when the coupler SPL has stabilized to within 3 dB of the steady value for a 90 dB input SPL, at one or more of 250, 500, 1000, 2000, 4000 Hz, with the gain control at RTS. Release: For hearing aids with AGC, the time between an abrupt change from 90 to 55 dB input SPL and the time when the coupler SPL has stabilized to within 4 dB of the steady value for a 55 dB input SPL, at one or more of 250, 500, 1000, 2000, 4000 Hz, with the gain control at RTS.
Chapter 4: Getting Started Guide ETLS For hearing aids with an inductive input coil (T-coil), first find HFA-SPLI, the high frequency average SPL in a magnetic field. Subtract from this (RTG+60 dB) to find ETLS, the equivalent test loop sensitivity. HFA MASL Orient the hearing instrument in the magnetic field for maximum pick-up sensitivity, measure HFA output SPL and calculate MASL (magneto-acoustical sensitivity level). Using the APxHITest API Introduction The APxHiTest DLL (HiTest.
Chapter 4: Getting Started Guide The user created application shown in the upper left corner of the diagram can access the APx511 analyzer through the APx500 API or through the HiTest DLL, or both. A sample use case for this would be an application to test hearing instruments that needs some of the more advanced features available in the APx500 API as well as the standard measurements available in the HiTest DLL.
Chapter 4: Getting Started Guide Calibration Two main areas are the focus of calibration. The microphone and must be calibrated and the speaker must be leveled for proper measurements to be made. Microphone Calibration The microphone may be calibrated with the use of a standardized calibrator that provides a known level, or entering the specifications from a microphone data sheet.
Chapter 4: Getting Started Guide VB.NET ' Declare a variable to hold the results Dim ospl90 As APxHiTest.XYarrayPair Dim path As APxHiTest.SignalPath Dim signal As APxHiTest.SignalType path = APxHiTest.SignalPath.Acoustic signal = APxHiTest.SignalType.FrequencyResponse ' Call the measurement function on the Acoustic path using Frequency Response ospl90 = apxHiTest.MeasureFrequencyResponseLevel(90.
Chapter 4: Getting Started Guide Measurement Overview To accomplish measurements that are in line with the ANSI standards, refer to the following table for guidelines of functions to call and what parameters to supply. ANSI [IEC] Test Name ANSI [IEC] Level HI Dut APxHiTest Measurement Name OSPL90 HFA OSPL90 90 dBSPL 90 dBSPL At FOG At FOG Full On Gain HFA Gain 60 dBSPL [50] 60 dBSPL [50] At FOG At FOG Set RTS 60 dBSPL At FOG MeasureFrequencyResponseLevel HfaMeasurement with HfaResultsType.
Chapter 4: Getting Started Guide APxHiTest SignalType Several of the measurements allow for a choice in the underlying test method. The caller can provide the selection. These are basically Chirp (or Frequency Response), Stepped Frequency Sweep, or Composite (Multitone). Programming samples We provide a number of programming samples to illustrate operating the APx511 in a production environment using the API.
Chapter 4: Getting Started Guide Running Self Test APx511 Self Test Kit (Self Test Fixture, cable and terminator. Audio Precision provides a group of “Self Test” APx projects, under control of a program called SelfTest.exe. Download Self Test from http://www.ap.com/download/archive/ 534. Be sure to select the Self Test for the version of APx500 you are currently running. Instructions are in the ReadMe.txt file included in the Self Test zip file.
Chapter 4: Getting Started Guide 36 APx511 Getting Started Guide
