Castle group GA213, GA215, GA256 User Manual

Notes:

Thank you for buying a Castle product, I am sure you will find both the
goods and the service to be of the highest quality but if not, then please
feel free to write to me personally and I will ensure that your needs are
dealt with immediately.

This manual is designed to show you the operation of the goods you
have purchased and a very brief insight into acoustics itself. If you would
like to become a competent person in the eyes of the law, then you may
like to know more about our Competent persons training course for the
Noise at Work Regulations.

It is my intention for Castle Group Ltd to provide a complete range of
Noise and Vibration products and Services of the highest standard. If
you would like to know more about any of our other products and
services then please complete the reply paid card and return it to us for
prompt action or telephone on [phone].

Simon Bull

Sales and Marketing Director

Warranty and After Sales Service

Castle Group Ltd design and manufacture precision instruments, which if treated
with reasonable care and attention should provide many years of trouble free
service.

In the event of a fault occurring, during the warranty period, the instrument should
be returned to Castle Group Ltd, in its original packaging, or to an authorised
agent. Please enclose a clear description of the fault or symptom.

Details of the warranty cover are available from Castle Group Ltd or an authorised
agent.

All instruments are designed to meet rigid British and International
Standards. An annual calibration is recommended to ensure that these high
standards are maintained. This is particularly important for cases in which
instrument readings are to be used in litigation or compliance work.

For warranty and service return to:
The Service Department

Castle Group Ltd
Salter Road
Cayton Low Road Industrial Estate
Scarborough
North Yorkshire
YO11 3UZ

Telephone [phone]
Fax [phone]
web www.castlegroup.co.uk

Any misuse or unauthorised repairs will invalidate the warranty.
Damage caused by faulty or leaking batteries is not covered by the warranty.

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Case Reflections of the popular range using the Aco 7052 microphone:

Stalk length 75mm from front of microphone grid to top of case body.

Frequency (Hz) Case Effect (dB) Frequency (Hz) Case Effect (dB)

PRECAUTIONS

• Only operate the instruments as described in this manual.

• These are precision instruments, protect from shocks and vibrations.

31.5 0.0 800 0.2

40 0.0 1000 0.0

50 0.0 1250 -0.3

63 0.0 1600 -0.2

80 0.0 2000 -0.5

100 0.0 2500 0.4

125 0.0 3150 -0.2

160 0.0 4000 -0.1

200 0.0 5000 0.1

250 0.1 6300 0.1

315 0.1 8000 0.0

400 0.1 10000 0.0

• Take special care with the microphone. The diaphragm is made from a very thin

metal and is easily damaged.

• Ambient conditions for the operation of the unit are as follows:-

Temperature -10°C to +50°C
Relative Humidity 30 to 90%

• Protect the unit from dust, water, extremes of temperature and humidity, direct

sunlight and air with a high salt or sulphur content.

• Always turn the unit off after use. Remove the battery from the instrument if it is

not to be used for an extended period (several days).

• Do not use any solvents or cleaning agents on the instrument. Use only a soft dry

cloth or a soft cloth lightly moistened with water when necessary.

• Do not let any conductive objects, such as wire of metal scraps get into the unit.

• Do not try to disassemble the instrument or attempt any repairs as this may

invalidate your warranty. Take a note of the condition of the instrument and
contact your authorised Castle service station.

• To ensure continued precision performance of your instrument have it checked

and serviced at regular intervals.

500 0.1 12500 -0.2

630 0.1 16000 0.0

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CONTENTS

TITLE PAGE NO

KEYPAD LAYOUT 1
INTRODUCTION 2

USING THE MANUAL 2
BATTERY INSTALLATION 3
THE MICROPHONE 3
SWITCHING ON AND OFF 4
ACTIVATING BUTTONS 4
CALIBRATION 5
DISPLAYING PARAMETERS 6
LOCKING THE INSTRUMENT 8
CONTRAST CONTROL 8
PAUSING/ PLAYING 8
RESETTING PARAMETERS 9
CHANGING RANGE 10
FREQUENCY/ TIME WEIGHTING 10
CRITERION/ EXCHANGE 11
INSTRUMENT STATUS 12
TECHNICAL SPECIFICATIONS 13
WARRANTY AND AFTER SALES SERVICE 19

Effect of Temperature:
Accuracy better than ± 0.5 dB over the range -10 to +50°C when corrected as indi-

cated here:
The temperature correction to be applied for GA601 / GA607 and microphone:
Corrected level = Actual level – 0.05(t-20)
Where t is the temperature in °C

Effects of Humidity:

Less than 0.5 dB over the range 25 to 90% relative humidity (provided there is no
Condensation), relative to the value at 50% relative humidity and 40°C.
Storage range: 0 to 90% relative humidity in the absence of condensation

Vibration:

Effect From 20Hz to 1kHz at 1ms

Humidity:

Effect < 0.5 dB from 30% RH to 90% RH

Magnetic Field:

Effect No noticeable effect

Body in Free Field:

Effect No noticeable effect

Windshield:

Attenuation < 0.2 dB

Battery: 1x MN1604 (size PP3) alkaline cell
Life: 20 hours continuous use (approx) based upon bench tests with procell

MN1604 batteries

Overall Dimensions:

Dimensions 210mm x 60mm x 35mm (approx.)
Weight 220g including batteries

-2

no noticeable effect

17