15. DC analog output jack
16. RS-232 output jack
Note: The Battery Compartment and the Threaded Tripod mount access are located on the back of the instrument
(not pictured)
Operation
Quick Start
1. Power the meter by pressing the ON/OFF key.
2. The meter’s LCD will count down to zero (99.9, 88.8, 77.7, etc.) and then begin measuring sound levels. If the
LCD does not switch on after pressing the ON/KEY check the 9V battery.
3. Point the microphone toward the source of the sound level to be measured and view the reading on the meter’s
LCD.
`A’ and `C’ Frequency Weighting
Select `A’ or `C’ weighting via the C/A key. The LCD will reflect the currently selected frequency weighting. Use `A’
weighting to have the meter respond as the human ear would with regard to frequency response (the human ear
boosts and cuts amplitude over the frequency spectrum). `A’ weighting is used for environmental measurements,
OSHA regulatory testing, law enforcement, and workplace design. Select `C’ weighting for flat responding
measurements (less amplitude boost or cut across the frequency spectrum). `C’ weighting is used in applications
where hearing conservation is not an issue; for example, in the diagnosis of malfunctions in electrical, electronic and
mechanical devices.
FAST/SLOW Response Time
Select either FAST (125ms response) or SLOW (1 second response) measurements by pressing the F/S key. The
LCD will reflect the currently selected mode. Selection of `Fast’ or `Slow’ is determined by the application and any
directives or standards related to that application. For example, most hearing conservation or OSHA related testing
is done using SLOW and A weighting.
MAX HOLD
The meter is capable of taking continuous measurements and only updating the LCD when a higher reading (than the
one presently on the display) is detected. The bargraph display continues to change while the main LCD waits for a
higher reading. Press the MAXHLD key to activate the MAX HOLD mode. The LCD will reflect the MAX HOLD
function. Press the MAXHLD key again to return to normal operation.
Record (REC) Function
To Record the Maximum and Minimum sound level measurements over a programmable period of time, press the
REC key. The REC indicator will appear on the LCD. Once the REC key is pressed, the meter begins tracking the
highest (MAX) and lowest (MIN) readings. Press the REC again and the MIN indicator will appear on the LCD along
with the lowest sound level reading since the REC key was pressed. Press the REC again and the MAX indicator will
appear along with the highest reading the meter has encountered since the REC key was first pressed. Press and
hold the REC until the REC indicator extinguishes to exit the RECORD mode.
BA (Background Noise Absorber) Mode
The Background Noise Absorber allows the user to accurately measure equipment noise by “eliminating” background
noise. The Sound Level Meter first stores the background noise as a reference level. From there, when a sound is
measured, the display will show the sound level measurement minus the background noise. To operate the meter in
BA mode, follow these steps:
1. Power the meter.
2. Press the MAXHLD key (the MAX HOLD icon will appear on the LCD).
3. Press the BA key (`F” will appear to the left of the SPL display icon).
4. Press the MAX HOLD key again (the MAX HOLD icon will reappear on the LCD).
5. The meter is now displaying the background, reference noise.
6. Power the device under test and note the new sound level meter reading.
7. If the reading changes, the new reading is the sound level of the device. If the reading does not change, the
noise produced from the device is either equal to or less than the background noise.
8. Press the BA key again to return to the normal mode of operation.
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