Calibration - Castle group GA213 Manual

INSTRUMENT STATUS
The STATUS button is used to display the status of the instrument.
Press STATUS
Repeatedly pressing the STATUS button will scroll through the parameters
below, depending on the instrument type.
BAT.80% Percentage battery capacity remaining
dBA SLOW Indicates the current frequency and time weighting
VER2.0 Indicates the firmware version number
RUNNING Indicates the instrument is running
PAUSED Indicates when the instrument is in pause mode (only
displayed if instrument is in pause mode)
90/3 Indicates the current criterion and exchange level
www. Scrolling web-site address
castlegroup.co.
uk
All
BAT 80%
listed
ALL
GA213/215
ALL
ALL
ALL
GA256
ALL
12
The STATUS menu is therefore circular and can be easily scrolled through by
repeated pressing of the STATUS button. Press the DISPLAY button at any time
to return to normal operation.
This format is repeated for the other functional buttons on your instrument.

CALIBRATION

The calibrators recommended for use are the Castle GA601/607 calibrators,
which supply 94dB/ 104dB (relative to 20µPa pressure) at a frequency of 1kHz.
Turn the instrument on by pressing the POWER button.
Press STATUS to check the battery condition. Replace the battery if the
indication is low.
Press MENU
Press OK and the instrument will now display the previous calibration level
e.g. >94.0. The calibration will be performed at the selected level
e.g.94.0dB but may be changed in 0.1 dB steps to match the calibrator output
by repeated pressing of the UP/DOWN arrow buttons or in 1dB steps by
repeated pressing of the STATUS/ PLAY keys. Ensure the calibrator is
attached firmly to the microphone. Ensure that the calibrator is set to the
chosen level.
Press OK and the instrument will calibrate to the level of the calibrator. The
display will show SETTLING while calibrating to the chosen level. When calibrated
the display will show COMPLETE. Press OK and the display will return to LP for
the GA213/215 and DOSE for the GA256.
If the input level is not within +/- 3dB of the chosen reference level then the
display will show CAL.FAIL. Check to make sure the calibrator is switched on and
emitting the correct level before proceeding as indicated above.
The instrument is now ready to take measurements.
All
CAL <OK
5