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3
Getting Started
The Display
Getting Started
The Display
The LCD display provides a numeric readout of sound level in 0.1 dB increments
along with a LOBAT (low battery) indicator. In the SPL mode the numeric display
provides a reading of the maximum sound pressure level measured during the
previous second. In the MAX mode the display
holds the highest reading encountered since the meter was placed in MAX, or
since the last time RESET was pressed.
The LOBAT indicator will light when the battery voltage is too low to allow an
accurate reading.
The display will show a + sign when signal peaks cause an overload condition in
the electronics. This indicator signals the user to switch to the next higher range to
prevent erroneous readings.
The display will show "Ur" if signal levels are too low to provide an accurate
reading. This indicator signals the user to switch to a lower range setting.
Meter Controls
OFF/SPL/MAX Switch
With the switch set to SPL the meter continuously displays sound level,
automatically updating the current reading at a rate of once per second.
Setting the switch to MAX causes the display to hold the highest SPL
encountered thus far. As a higher SPL occurs, the display changes to show
the new value. To reset the value stored, press and hold the RESET button
for a few seconds, then release. This will erase the previous MAX value
(and display the current value) prior to taking new readings. For response
times see Figures 7 and 8.
"F" (FAST) / "S" (SLOW) RESPONSE Switch
The RESPONSE switch controls the rate at which the meter responds to
changing input signals. Most sound measurements are done with the
response set to SLOW. The FAST response is generally used when
measuring short duration noises such as moving vehicles.
The RESPONSE switch positions are as follows:
•
•
056-652, Rev.D
FAST - 125 millisecond time constant. (See Figure 12).
SLOW - 1 second time constant. (See Figure 13).
Getting Started
1100/2100 SLM models
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