Version 3.2 8/07

5

Range Selection

Slide the Range switch to the 30-80, 60-110 or the 80-130 position.

The selected range will be indicated on the LCD bargraph. If the

measured dB level exceeds the range selected “OL” will be

displayed. If the measured dB level is below the selected range “- - -“ will be

displayed.

Normally, select the range in which the upper dB level is greater than any

expected sound pressure level. The 60 to 110dB range is the most commonly

used range. Use the 30 to 80dB range in quieter areas such as offices and

classrooms.

Note: When the range is changed the Max display may indicate an overload “OL”. Press

the MAX RESET button to clear the MAX display.

High Limit Set

Press the up or down LIMIT arrow buttons to set the High/Low limit

set=point as displayed on the LCD. If the measured dB level

exceeds the set limit, the

indication will appear in the display

and the over limit signal will appear at the alarm output connector.

The display indication and output signal will remain active as long as the sound pressure

level exceeds the set limit.

High/Low LED Alert

The four LEDs are used to alert users when a sound level either exceeds or goes below

the Limit set-point. This feature is available only while the AC adaptor is used to power the

meter. It is disabled under battery power.

The LEDs will provide a steady or flashing colored indication depending on the setting of

the side panel ALARM and Alert switch settings.

The three Alert switch positions are: (1) RED, (2) RED-GREEN, (3) GREEN

Alarm

Switch

Alert Switch

LED response

Red (1)

LED’s flash red while dB level exceeds set point.

Red-Green (2)

LED’s flash red while dB level exceeds set point.

40 second green indication when level transitions from

high to low.

High

ALARM

Green (3)

40 second green indication when level transitions from

high to low.

Green (3)

LED’s are green while dB level is below set point.

Red-Green (2)

LED’s are green while dB level is below set point.

40 second flashing red indication when level

transitions from low to high.

Low

ALARM

Red (3)

40 second flashing red indication when level

transitions from low to high.