SV 102A+ Class 1 Dual Channel Dosimeter
The SV 102A+ is a Class 1 dual-channel noise dosimeter, integrating two distinct functionalities: dual-channel noise measurement and Class 1 frequency range capability. The dual-channel feature allows for simultaneous noise exposure assessment on both sides of the head or in configurations such as underneath a headset and on a shoulder, enhancing the accuracy of noise exposure data in diverse working environments. This capability is particularly beneficial for assessing asymmetric noise exposure, where noise may predominantly come from one direction.
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Class 1 accuracy of the SV 102A+ signifies its ability to measure a full frequency range from 20 Hz to 20 kHz. This is a critical feature for workplaces with high-frequency noise sources, as standard Class 2 dosimeters typically measure up to only 8 kHz. The wider frequency range makes sure that the instrument meets the requirements of ISO 9612 for Class 1 instruments, which is important for accurate noise assessment in places where there is a lot of high-frequency noise.
The SV 102A+ also features audio recording, facilitating unattended noise measurements. This capability allows for the playback of recorded noise to identify and verify noise sources, a requirement under ISO 9612 for distinguishing work-related noise from non-work-related noise sources. Additionally, the dosimeter’s 1/1 octave analysis feature enables the precise selection of hearing protectors based on the specific noise environment, further enhancing workplace safety.
MIRE Measurement with SV 102A+
MIRE (Microphone in Real Ear) measurement is a specialized technique used with the SV 102A+ for assessing noise exposure from sources in close proximity to the ear, such as in call centers, pilot helmets, and headsets. This method involves placing a microphone at the entrance of the ear canal to accurately capture the noise exposure experienced by the individual. The SV 102A+ supports 1/3 octave analysis for MIRE measurements, a requirement to meet ISO 11904-1 standards for recalculating noise doses based on actual noise levels inside the ear canal.
For MIRE measurements, the SV 102A+ utilizes a high sampling rate of 48 kHz, consistent with Class 1 instrumentation standards. This high sampling rate is essential for capturing the full spectrum of noise frequencies encountered in close-ear environments, ensuring accurate and reliable noise exposure assessments.
The small and compact SV 15 preamplifier together with special mounting clip and dedicated headband enables an easy attachment of the microphone in extremely short distance to human ears. Calibration by measurement can be easily performed by direct usage of common acoustic calibrators.
The combination of dual-channel measurement, Class 1 frequency range capability, and MIRE measurement technique positions the SV 102A+ as a preferred instrument for noise exposure assessment in military, aerospace, and call center applications worldwide. Its comprehensive features ensure that it meets the stringent requirements for noise measurement and analysis in these specialised fields.
SV 102A+ Class 1 Dual Channel Dosimeter Specification
| Standards | IEC 61252; ANSI S1.25-1991; Class 1: IEC 61672:2002, ISO 11904-1 |
| Acoustic Dosimeter Mode | Lav/Leq, SPL, Lmax, Lmin, SEL, SEL8, PSEL, LEPd, Dose (%), TWA, E, E_8h, Peak, Run Time, Upper Limit Time (ULT), L(C-A), Projected Dose (D_8h) |
| SLM Mode | Leq, Spl, SEL, LEP,d, Lden, Ltm3, Ltm5, statistics – Ln (L1- L99), LMax, LMin, LPeak Simultaneous measurement in three profiles with independent set of filters and detectors |
| Weighting Filters | A, C and Z |
| RMS Detector | Digital true RMS detector with Peak detection, resolution 0.1 dB Time constants: Slow, Fast, Impulse |
| Microphone | SV 7052E, prepolarised, 1/2″ housing SV 25S, special microphone with dedicated probe for Microphone-In-Real-Ear technique (option) |
| Preamplifier | SV 15 with integrated cable |
| Measurement Range | 45 dBA RMS ÷ 141 dBA Peak (with SV 7052E microphone) |
| Typical noise floor | less than 35 dBA |
| Frequency Range | 20 Hz ÷ 20 kHz, sampling rate 48 kHz |
| Dynamic Range | 100 dB |
| Data Logger1 | Time-history logging of Leq/Lmax/Lmin/Peak/Lav results to internal memory with time step down to 100 millisecond to microSD card |
| Audio Recorder1 | Time-domain signal events recorder (option) |
| Dual-channel Mode | Dual-channel measurement mode with second microphone SV 7052E or SV 25S (option) |
| 1/1 Octave1 | Dual-channel 1/1 octave real-time analysis and spectra logging, 10 filters with centre frequencies from 31.5 Hz to 16 kHz, Type 1: IEC 61260 (option) |
| 1/3 Octave1 | Dual-channel 1/3 octave real-time analysis and spectra logging, 31 filters with centre frequencies from 20 Hz to 20 kHz, Type 1, IEC 61260 (option) |
Basic Data | |
| Input | 2 x LEMO 2-pin, Direct |
| Display | Colour 160 x 128 pixels OLED type |
| Memory | MicroSD card 8 GB (removable & upgradeable) |
| Interfaces | USB 1.1 Client Extended I/O – AC output (1 V Peak) / Digital Output (Alarm trigger) / Digital Input (Input trigger) |
| Power Supply | Two AA batteries (alkaline): operation time > 16 h (3.0 V / 1.6 Ah)2 Two rechargeable batteries (not included): operation time > 20h (2.4 V / 2.6 Ah)2 USB interface: 150 mA HUB |
| Environmental Conditions | Temperature: from -10 oC to 50 oC Humidity: up to 90 % RH, non-condensed |
| Dimensions | 95 x 83 x 33 mm (without microphones) |
| Weight | 260 grams with batteries (without microphones) |
1function parallel to the acoustic dosimeter mode or meter mode
2depends on instrument operation mode
*Continuous product development and innovation are the policy of our company. Therefore, we reserve the right to change the specifications without prior notice.
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