1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA SB 10-2016Audio Standard for Nurse Call SystemsNEMA Standards Publication SB 10-2016 Audio Standard for Nurse Call Systems Published by: National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn
2、, Virginia 22209 www.nema.org 2016 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American
3、copyright conventions. NOTICE AND DISCLAIMER The information in this publication was considered technically sound by a consensus among persons engaged in its development at the time it was approved. Consensus does not necessarily mean there was unanimous agreement among every person participating in
4、 the development process. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document herein is one, are developed through a voluntary standards development process. This process brings together volunteers and/or seeks out the views of persons
5、 who have an interest in the topic covered by this publication. Although NEMA administers the process and establishes rules to promote fairness in the development of consensus, it does not write the documents, nor does it independently test, evaluate, or verify the accuracy or completeness of any in
6、formation or the soundness of any judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, property, or other damages of any nature, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publicat
7、ion, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, express or implied, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any particular
8、purpose(s) or need(s). NEMA does not undertake to guarantee the performance of any individual manufacturers or sellers products or services by virtue of this standard or guide. In publishing and making this document available, NEMA is not undertaking to render professional or other services for or o
9、n behalf of any person or entity, nor is NEMA undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of rea
10、sonable care in any given circumstance. Information and other standards on the topic covered by this publication may be available from other sources, which the user may wish to consult for additional views or information not covered by this publication. NEMA has no power, nor does it undertake to po
11、lice or enforce compliance with the contents of this document. NEMA does not certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other statement of compliance with any health- or safety-related information in this document shall not be at
12、tributable to NEMA and is solely the responsibility of the certifier or maker of the statement. 2016 National Electrical Manufacturers Association NEMA SB 10-2016 Page i 2016 National Electrical Manufacturers Association CONTENTS Page Foreword . iii Section 1 General . 1 1.1 Scope . 1 1.2 Purpose 1
13、1.3 Definitions 1 1.4 Referenced Publications 2 Section 2 General Requirements 3 2.1 Equipment Setup 3 2.2 System Output Levels 3 2.3 System Input Levels . 3 2.4 Ambient SPL 3 2.5 Minimum Signal to Noise Ratio 3 Section 3 Test Equipment Required . 8 Section 4 Test Procedure 10 4.1 Data Recording 11
14、4.1.1 Installation . 11 4.1.2 Operation . 11 4.2 NCS Output/Patient Station Input Sensitivity . 11 4.2.1 System Configuration 11 4.2.2 Reference 11 4.2.3 Test 11 4.3 Mode A Signal to Noise (Patient Station) . 11 4.3.1 System Configuration 11 4.3.2 Reference 11 4.3.3 Test Procedure 11 4.3.4 Calculati
15、ons . 11 4.4 Mode A Level (Pillow Speaker) 12 4.4.1 System Configuration 12 4.4.2 Reference 12 4.4.3 Test Procedure 12 4.5 NCS S/N from Pillow Speaker . 12 4.5.1 System Configuration 12 4.5.2 Reference 12 4.5.3 Test Procedure 12 4.5.4 Calculations of Pillow Speaker S/N . 12 4.6 Mode B Level (Patient
16、 Station) 12 4.6.1 System Configuration 12 4.6.2 Reference 13 4.6.3 Test Procedure 13 4.7 Mode B S/N (Patient Station) . 13 4.7.1 System Configuration 13 4.7.2 Reference 13 4.7.3 Test Procedure 13 4.7.4 Mode B S/N (Patient Station) 13 4.8 Mode B Level (Pillow Speaker) 13 4.8.1 System Configuration 1
17、3 4.8.2 Reference 13 NEMA SB 10-2016 Page ii 2016 National Electrical Manufacturers Association 4.8.3 Test Procedure 13 4.9 Mode B S/N (Pillow Speaker) 14 4.9.1 System Configuration 14 4.9.2 Reference 14 4.9.3 Test Procedure 14 4.9.4 Calculation of the Mode B S/N (Pillow Speaker) . 14 TABLES Table 1
18、 Nurse call audio performance data worksheet 10 FIGURES Figure 1 Setup for mode A level (NCS) 4 Figure 2 Setup mode B level, patient station/pillow speaker 5 Figure 3 Setup for mode B S/N ratio (pillow speaker/patient station) . 6 Figure 4 Setup for mode A S/N ratio (NCS) 7 Figure 5 Test set: typica
19、l pillow speaker or patient station setup for S/N measurements 8 Figure 6 Test set: typical NCS setup for S/N measurements . 9 NEMA SB 10-2016 Page iii 2016 National Electrical Manufacturers Association FOREWORD The preparation of this standard publication was initiated in response to input from the
20、 Veterans Administration. Input from other interested parties has also been sought and evaluated. Inquiries, comments and proposed or recommended revisions should be submitted to the concerned NEMA product subdivision at the following address: Director, Technical Standards National Electrical Manufa
21、cturers Association 1300 N. 17thStreet, Suite 900 Rosslyn, VA 22209 NEMA standards publications are periodically reviewed to meet changing conditions and technical progress, and the latest edition shall be used. Comments from the users of NEMA SB 10-2016 are welcome, and should be sent to the above
22、address. By way of introduction, a nurse call system is used in healthcare facilities to provide audible tones and visual indications to alert staff of patient requests for help or assistance. Audio (voice) communication may be provided in addition to the primary audible and visual signaling indicat
23、ions to optimize and enhance staff response to patient requests for attention or assistance. NFPA 99 Health Care Facilities Code, together with NFPA 70 National Electrical Code and applicable state and local building codes, determines the requirements for nurse call systems in healthcare facilities.
24、 As of the 2015 edition of NFPA 99, the requirements for nurse call systems are codified. Most states typically rely on NFPA 99 and NFPA 70 to establish state and local requirements with little, if any, change. ANSI/UL 1069 Hospital Signaling and Nurse Call Equipment provides detailed and specific c
25、onstruction, reliability, performance, and safety requirements for nurse call systems and associated equipment. It defines the fundamental equipment required and fundamental operations of a nurse call system, as well as the requirements for installation and user operation. Comprehensively, ANSI/UL 1
26、069 is in conformance with the requirements set forth in NFPA 99 and NFPA 70. However, there is no standard that defines audio performance characteristics. Therefore, this audio standard, NEMA SB 10-2016, is intended to be used by nurse call system manufacturers to claim conformity to a consensus au
27、dio standard, even though there is no third party NRTL assessment, certification, or requirement. This NEMA standards publication is the result of many years of research and investigation by members of NEMA and some members of the ANSI/UL 1069 standards technical panel. It was developed through cons
28、ultation among manufacturers, users, and testing laboratories, and it reflects the study of the standards and technical documents identified in section 1.4, which were helpful in its preparation. NEMA SB 10-2016 is developed and maintained by the NEMA 3SB-2 Health Care Communications and Emergency C
29、all Systems Group. Publication of this standard does not necessarily imply that all members of the 3SB-2 product group voted for approval or participated in its development. At the time NEMA SB 10-2016 was approved, the 3SB-2 Health Care Communications and Emergency Call Systems Group consisted of t
30、he following members: Aiphone Corporation Ascom US Inc. Cornell Communications, Inc. Curbell Medical Products, Inc. Heritage MedCall LLC Inovonics Rauland-Borg Corporation Silversphere Technologies Inc. SimplexGrinnell LP Techtone Sound b) functioning properly in accordance with manufacturers specif
31、ications; c) operated correctly in accordance with manufacturers operating instruction; and d) interchangeably configured to achieve two-party intercom communication between the NCS and one patient station or pillow speaker. 2.2 System Output Levels The output level shall be measured one meter on ax
32、is from the speaker of the receiving element of a two-party intercom communication and be referred to the input level at the transmitting microphone as specified herein. 2.3 System Input Levels The input level shall be measured at the microphone at the transmitting end of the two-party intercom comm
33、unication and shall be the minimum input supplied for the output level test. 2.4 Ambient SPL The maximum ambient SPL at input and output transducers shall not exceed 50 dB for valid test results. The NCS input level (mode B) shall be 66 dB SPL maximum, measured at the microphone of the NCS (see figu
34、re 2). The patient station output level (mode A) shall be 76 dB SPL minimum measured on axis at a distance of 1 meter from the patient station speaker (see figure 2). The pillow speaker output level (mode A) shall be 76 dB SPL minimum measured on axis at a distance of 1 meter from the pillow speaker
35、 (see figure 2). The patient station input level (mode B) shall be 66 dB SPL maximum measured at the microphone of the pillow speaker (see figure 1). The pillow speaker input level (mode B) shall be 66 dB SPL maximum measured at the microphone of the pillow speaker (see figure 1). The NCS output lev
36、els (mode A) shall be 76 dB minimum measured on axis at a distance of 1 meter from the NCS speaker (see figure 1). 2.5 Minimum Signal to Noise Ratio The following shall be the minimum S/N measured at the speakers: a) Patient station speaker: 35 dB (see figure 3). b) Pillow speaker: 25 dB (see figure
37、 3). c) NCS: 35 dB (see figure 4). NEMA SB 10-2016 Page 4 2016 National Electrical Manufacturers Association Figure 1 Setup for mode A level (NCS) It shall be permissible to use either a patient station or a pillow speaker as a reference for the nurse station receiver level. The one-meter distance m
38、ust be maintained throughout the test, and all measurements taken on axis and all sources aligned on axis. NEMA SB 10-2016 Page 5 2016 National Electrical Manufacturers Association Figure 2 Setup mode B level, patient station/pillow speaker It shall be permissible to use either a patient station or
39、a pillow speaker as a reference for the NCS input level. The one-meter distance must be maintained throughout the test, and all measurements taken on axis and all sources aligned on axis. NEMA SB 10-2016 Page 6 2016 National Electrical Manufacturers Association Figure 3 Setup for mode B S/N ratio (p
40、illow speaker/patient station) It shall be permissible to use either patient station or a pillow speaker as a reference for S/N ratio. See figure 3. NEMA SB 10-2016 Page 7 2016 National Electrical Manufacturers Association Figure 4 Setup for mode A S/N ratio (NCS) It shall be permissible to use eith
41、er patient station or a pillow speaker as a reference for S/N ratio. See figure 5. NEMA SB 10-2016 Page 8 2016 National Electrical Manufacturers Association Section 3 Test Equipment Required The following test equipment shall be used to test the parameters of installed nurse call systems covered by
42、this standards publication: a) A pink-noise generator, with transformer-coupled output, capable of providing signal levels of at least 1 V rms at 10 mA or signal levels sufficient to drive the nurse call system, in all modes of intercom operation, to maximum output levels, per manufacturers specific
43、ations. b) An rms reading voltmeter with a range of 10 V to 100 V; a minimum input impedance of 100K ohms and a minimum frequency response of 3 dB from 100 Hz to 10 kHz. c) A sound level meter with a range of 20 dB SPL to 120 dB SPL and frequency response conforming to ANSI “C” weighting response ch
44、aracteristics. d) An audio amplifier and speaker with frequency response of 3 dB over the range of 100 Hz to 10 kHz and capability of producing an SPL of 90 dB at a distance of 1 meter measured on axis. e) Patient station/pillow speaker test set (see figure 5) as specified by the manufacturer. f) NC
45、S test set (see figure 6) as specified by the manufacturer. Figure 5 Test set: typical pillow speaker or patient station setup for S/N measurements . NEMA SB 10-2016 Page 9 2016 National Electrical Manufacturers Association Figure 6 Test set: typical NCS setup for S/N measurements NEMA SB 10-2016 Pa
46、ge 10 2016 National Electrical Manufacturers Association Section 4 Test Procedure Table 1 Nurse call audio performance data worksheet 4.1.1 Installation: correct per manufacturers instructions (pass/fail) _ 4.1.2 Operation: performs all specified functions per manufacturers specifications and operat
47、ing instructions (pass/fail) _ Test Proc Steps Name Setup Reference Measure Values Spec. P/F 4.2 4.2.2 Mode A level (patient station) Figure 1 station 66 dB at patient station SPL at 1 meter from NCS speaker 76 dB _ 4.3 Mode A S/N (patient station) Figure 4 66 dB at patient station Calculate: switch
48、 in dummy load 20 Log (4.3.3b/4.3.3d) SPL at 1 meter_from NCS speaker and V rms_(4.3.3b) across NCS speaker V rms_(4.3.3d) across NCS speaker 35 dB _ 4.4 Mode A Level (pillow speaker) Figure 1 66 dB at pillow speaker SPL at 1 meter_from NSC speaker 76 dB 4.5 Mode A S/N (pillow speaker) Figure 4 66 d
49、B at pillow speaker SPL at 1 meter_from NCS speaker and V rms_(4.5.3b) across NCS speaker V rms_(4.5.3d) across NCS speaker _ (verify 76 dB) 4.5.4 Calculate: switch in dummy load 20 Log (4.5.3b/4.5.3d) 35 dB 4.6 Mode B Level (patient station) Figure 2 66 dB at NCS microphone _ 76 dB 4.7 Mode B S/N (patient speaker) Figure 2 66 dB at NCS microphone SPL at 1 meter_from patient station and V rms_(4.7.3b) across NCS speaker V rms_(4.7.3d) across patient station speaker _ (verify 76 dB) 4.7.4 Calculate: switch in dummy load 20 Log
