Mảng micrô bán cầu 67HB 2 m CCP

1. Introduction

The structure is made portable to achieve a high degree of freedom of location. This, combined with the easy, tool-less assembly in minutes, enables you to save expensive anechoic chamber time and to offer on-site sound power diagnostics.
The microphone positions are clearly marked to ease the mounting and maintain measurement repeatability.

The GRAS 67HB-04 2 m CCP Hemisphere kit, 4 channels (4 key + 4 secondary) is ISO 3746:2011 B1/ANSI S12.56 compliant and includes:

1x Hemisphere structure
4x GRAS 46AE 1/2” CCP Standard Microphone Sets, cables, holders

The GRAS 67HB-05 2 m CCP Hemisphere kit, 10 channels (10 key + 10 secondary) is ISO 3744:2010 B2/ANSI S12.54 compliant and includes:

1x Hemisphere structure
10x GRAS 46AE 1/2” CCP Standard Microphone Sets, cables, holders

The GRAS 67HB-06 2 m CCP Hemisphere kit, 20 channels (20 key) is ISO 3745:2012 E2/ANSI S12.55 compliant and includes:

1x Hemisphere structure
20x GRAS 46AE 1/2” CCP Standard Microphone Sets, cables, holders

2. Typical Applications and Uses

Depending on the size and the emitted acoustic level of the DUT, the hemispheres will allow sound power measurements on everything from small-sized personal electrics to office machines and IT products, household appliances, power tools, and smaller engines. The only restriction is, that the characteristic dimension of the DUT may be no more than half the measurement radius.

3. Design

The hemispheres, 1 m or 2 m radius, are available as preconfigured kits with 4, 10 or 20 microphone sets in 3 variations; CCP, LEMO and low-noise LEMO. The microphone sets can be connected directly to all professional measurement systems and are available for both CCP and 7-pin LEMO inputs. If your system platform supports intelligent transducers according to IEEE 1451.4 (TEDS), the system can be set up to identify the microphone properties and position in the array.

4. Calibration

All included microphone sets are delivered with individual calibration charts including sensitivity values and frequency responses. These sensitivity values can be used directly in your system setup.

For frequent measurement chain verification, a reference sound source will be required. GRAS supplies 114 dB types for the standard microphone sets and a special 94 dB adapter for the low-noise sets. Depending on the use and your internal quality control requirements we recommend that the sets are re-calibrated at least every second year.

5. Specifications


Frequency range (±2 dB)	3.15 Hz to 20 kHz
Dynamic range w/ GRAS CCP preamplifier	17dB (A) to 135dB
Set sensitivity (250Hz, ±2 dB)	50 mV/Pa
IEC 61094-4 Compliance	WS2F
ANSI Standard	S12.56
Standard	ISO 3746:2012
Weight	1500g
Available Configurations	1/2m CCP/LEMO Hemisphere kit 4 ch. 1/2m CCP/LEMO Hemisphere kit 10 ch. 1/2m CCP/LEMO Hemisphere kit 20 ch.

6. Download

67HB Datasheet

67HB Brochure

7. Contact

Unit 2209, Golden Park Tower, 2 Pham Van Bach Street, Yen Hoa, Cau Giay District, Ha Noi, Vietnam

tel.: +84 (24) 38229808

fax: +84 (24) 38229553

cell: +84 90 336 8648

email: tuonglam@syscovn.com

67HB 2 m CCP Hemisphere kit