CASTLE Sonus B, GA257B Getting Started Manual

Castle Group Limited

Salter Road, Scarborough, North Yorkshire, YO11 3UZ, UK

Tel: [phone], Fax: [phone]

email: [e-mail], Internet: www.castlegroup.co.uk

Castle Sonus B
Personal Exposure Meters

Power On /

Off

Stop /

Record

Cancel

Main
Menu

Down
Arrow

Up Arrow

Information

Lock Keypad

OK

Castle Group Limited

Salter Road, Scarborough, North Yorkshire, YO11 3UZ, UK

Tel: [phone], Fax: [phone]

email: [e-mail], Internet: www.castlegroup.co.uk

Starting up your SONUS Dosemeter

To turn on your instrument press and hold the Power On/Off key for approximately
one second. (Your meter will display the start-up screen and initialise any saved settings.)

To Calibrate using a Castle Calibrator (GA601 or GA607) attach the calibrator to the
microphone, press the MENU key so that CAL <OK is on the screen. Press OK to show the
calibration level (default 94dB). Wait for 5 seconds then press OK again and the
instrument will calibrate to the level of the calibrator, displaying COMPLETE when finished.

Locking the Keypad

To lock the keypad, press the padlock key . This will immediately lock the keypad, and
the display will show the battery indicator screen, i.e. BAT: |||| |||| |||| ||||. To unlock the instrument,
press C, OK, i in succession, and the display will return to the LAF screen.

Taking a Measurement

To start measuring, press the STOP/RECORD Key so the display briefly shows REC
MODE. You can review the parameters using  arrow keys during recording

When ready to stop, press again, so the display shows STOP intermittently. The
measurements are now frozen so use  arrow keys to scroll through parameters.

If the STOP/RECORD Key is pressed again, the unit will continue to accumulate
measurements. To reset the measurements at any time, press C. The unit will show the
prompt “CONFIRM?” Press OK and the unit will reset. Note: The measurements are not
saved on this instrument and will be reset on switching off.

Calculating Exposure

The GA257B is capable of calculating the daily exposure based on a given Exposure Time.

To set this Exposure Time, press MENU and use the  arrow keys until the display shows
ET <OK. Press OK so the display shows HOURS 08 and use  arrow keys to change to
the desired number. Press OK so the display shows MINS 00 and use  arrow keys to
change to the desired number and Press OK to finish. The display will briefly show DONE.

To view the daily exposure calculation, Press C to get to the measurement screen and use
the  arrow keys to find the parameter Lep. This is the LEP’d (Daily Personal Noise
Exposure Level) and shows the exposure level in decibels for the given Exposure Time.

This setting will be saved when the instrument is powered off.