The SONUS GA257B pocket Dosemeter is designed to be powerful and easy to use. Its small and rugged allowing measurments to be collected throughout the working day.
The GA257B dosemeter has a clear display allowing data to be read on screen, a keypad that can be locked to prevent any measurements being accidentally stopped or altered and an ingeniously simple navigational menu.
The built in software for this meter is designed to suit future upgrading for feature enhancements, legislative changes or instrument upgrades. With the Castle GA257B dosemeter you will always be in step with the law.
For complete technical specifications and / or operating instructions please download the available datasheets or user manuals.
The GA257B meets the following standards and has the following specifications: -
Applicable Standards:
BS EN 61252:1997 + A1:2001
IEC 61252-1993
Parameters Available:
Lp, Leq, peak, LE, Pa2h, Lep’d, Projected Lep'd, DOSE%, Projected DOES%, Dose Per Hour,
Elapsed Time, Overload
Microphone and Preamplifier:
Fixed pre-amplifier design with 7V (p-p) input max
Typical actuator to free-field correction factor (based on 500Hz=0) is shown below
| 20Hz: 0 |
1kHz: +0.1 |
| 25Hz: 0 |
1.25kHz: +0.2 |
| 31.5Hz: 0 |
1.6kHz: +0.3 |
| 40Hz: 0 |
2kHz: +0.4 |
| 50Hz: 0 |
2.5kHz: +0.5 |
| 63Hz: 0 |
3.15kHz: +0.8 |
| 80Hz: 0 |
4kHz: +1.2 |
| 500Hz: 0 |
5kHz: +1.6 |
| 630Hz: 0 |
6.3kHz: +2.3 |
| 800Hz: 0 |
8kHz: +3.6 |
Display:
Back-lit LCD panel (8x1 Characters)
Alpha-Numeric display for measured results
Level Range:
Measuring Range: 75-140
Linear Operating Range (IEC61672-1): 65dB
1 Measurement Range (IEC61672-1): 70-140
Peak: 3dB above top of selected range
Noise Floor:
'A' Weighting 23 dB(A) rms
'C' Weighting 24 dB(C) rms
Frequency Weighting:
'A' and 'C' to IEC 61672-1:2002 and IEC 60651:1979+A1+A2
Frequency Range:
20 Hz - 8 kHz (including microphone)
1 Hz - 20 kHz (electrical characteristics)
Time Weighting:
Fast and Slow in Accordance with IEC 61672-1-2002
DOSE Calculations:
Exchange rate: 3dB, 4dB or 5dB
Criterion Level: 75dB, 80dB, 85dB or 90dB
Threshold Level: -5dB, -10dB or OFF
Instrument Response:
Simultaneous Peak and RMS
Calibration:
Software controlled 91.0 to 120.0 dB (1kHz) in 0.1 dB steps
Power Requirements:
Batteries: 1 x 6LR61 (size PP3), Life: >12 hours (alkaline batteries, continuous operation)
Size and Weight:
Dimensions: 60mm (width) x 35mm (depth excluding pocket clip) x 135mm (height without microphone)
Weight: 220gms (including battery)
Operating Temperature:
Operating Range: -10 to + 50ºC
Humidity:
Effect: < 0.5dB from 25% to 90% RH
Vibration:
No effect on instrument
EMC:
Emissions: EC 61000-6-3, EN61326-1:2006, CISPR 22:1997
EN55022:1998, FCC Rules, Part 15 2003 Class B
Immunity: IEC 61000-6-2:2005, EN61326-1:2005
Levels ±4kV (Contact), ±8kV (Air)
Amp Mod: IEC 61000-6-2:2005, Level 10V/m
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