407736 V2.0 5/08

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Meter Operation

Quick Start

1. Power the meter by moving the RANGE switch to the LO or HI position. The meter will

begin displaying sound levels. If the LCD does not display, check that the battery is

good.

2. Place the meter on a tripod or hold the meter in hand facing the microphone toward the

source of the sound to be measured. Note that the tripod mount is on the back of meter.

3. View the measurement on the meter’s LCD. An indication of ‘OVER’ means that the

measurement is out of range. Select another measurement range in the event of an

over-range condition.

‘A’ and ‘C’ Frequency Weighting

Use the FUNCT (function) switch to select ‘A’ or ‘C’ frequency weighting. Use ‘A’ weighting

to have the meter simulate the response of the human ear (the human ear boosts and cuts

sound levels at specific points over the frequency spectrum). ‘A’ weighting is used for

environmental measurements, OSHA regulatory testing, law enforcement, and workplace

design. Select ‘C’ weighting for flat response measurements (no boosting or dampening

across the frequency spectrum). ‘C’ weighting is suitable for the operational maintenance

and analysis of machinery, motors, pumps, engines, etc.

FAST/SLOW Response Time

Use the RESPONSE switch to select FAST (125 ms) or SLOW (1 second) response time.

The application at hand (and any directives or standards) will dictate which response to

select. For example, most hearing conservation or OSHA related testing is done using

SLOW mode and ‘A’ weighting.

MAX HOLD

In this mode, the meter only updates the LCD when a higher reading than the one

presently on the display is detected. Select MAX HOLD using the RESPONSE switch. The

LCD shows ‘MAX HOLD’ in this mode. Press RESET to reset the MAX HOLD reading.

Analog Outputs

The meter includes an AC and a DC analog output for use with chart recorders,

dataloggers, etc. The AC output is 0.65V rms full scale and the DC output is 10mV per dB.

The 3.5mm output jack is located on the right side of the instrument. Use a stereo mini-

plug as shown in the diagram below to connect the meter to a datalogger or other

recorder.

1.

Sleeve: ground

2.

Ring: DC out

3.

Tip: AC out

Calibration Check

This meter provides a built-in calibration adjustment. The calibration adjustment

potentiometer is located on the front panel beneath the FUNCT switch. Put the FUNCT

switch to the CAL 94dB position and adjust the potentiometer for a display of exactly

94dB. For calibration with an external sound level calibrator, refer to the instructions

accompanying the calibrator.

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