Introduction; Using The Manual - Castle group GA213 Manual

INTRODUCTION

The GA213, GA215 and GA256 are part of Castle's "Pocket Range" of
meters and have been designed to surpass the requirements of the new
international Class 2 sound level meter standards. They may be used in
industry or for general purpose measurement to ascertain noise levels
accurately yet economically.
This manual contains complete operating instructions for the above named
instruments, read it carefully and you will quickly become familiar with your
instrument. If you have problems with the operation of the instrument please
call Castle Group Ltd on +44 (0)1723 584250 or fax +44 (0)1723 583728.

USING THE MANUAL

In the course of this manual a named button written in BOLD means press that
button. E.g. OK means press the OK button.
Since this manual covers the operating instructions for three instruments the
shaded areas of the title serves to inform the user which functions are present
on your instrument.
E.g. The following title informs you that this function is only applicable to the
GA213/215
CHANGING RANGE GA213/215
2
Linear Operating Range:
GA213/GA215 65dB
GA256 67dB
Reference Level:
GA208, GA214 94dB
Reference Range:
GA213/GA215 55 – 120
Reference Frequency:
GA213/GA215 1kHz
Display:
Digital 1 x 8 alphanumeric, digit size 7mm x 5mm Liquid Crystal Display
Microphone:
Aco ½ " Electret Condenser Microphone Cartridge Type 7052
Type
Diameter (inch)
Response Type
Polarisation (V)
Frequency Range (Hz)
Sensitivity (mV/Pa)
Sensitivity (dB re 1V/Pa)
Capacitance (pF)
Max. Sound Pressure Level (dB)
Temperature Coefficient (dB/°C)
Specification
0.5
Free-Field
0
20 - 8000
25
-32
18
146
-0.01
15