Cirrus Research CR308, Instrument Handbook

Page: 13 / 28

CR:308 & CR:310 – User Manual Page 13
To set the alarm level, press to enter the alarm setup display.
Set the desired level and enabled the alarm by using the arrow buttons. A tick denotes that the
alarm is active; a cross denotes that the alarm is disabled. When set, press to confirm.
NB: the alarm level should not be set to less than 129dB.
With the alarm enabled, the main display will indicate that the level has been exceeded by
showing an asterisk (*) next to the sound level reading. The triggered threshold value can be
reset by pressing
NV: this will also reset the maximum, minimum and LCpk measurement values.
6.4 Performing and printing a measurement (CR:310 only)
Press to start or stop a measurement.
While a measurement is running, the latest values will be displayed on the screen, with the
measurement duration shown at the bottom. Alternative measurement parameters can be
viewed by pressing the up/down arrow buttons.
Overload and under-range are denoted by the ^ and V indicators in the top right corner of the
screen.
After stopping a measurement, the overall measurement values are displayed. Press the
up/down arrows to scroll through the overall measurement values.