6
5. Enable or disable auto power off
. Once the format of decimal point divisions has been
set and stored, the display will show the word “yES’ over the term “PoFF”. Press the
▼
button until the desired automatic power off management scheme (“yES” for enable;
“no” for disable) is displayed. Press the REC/ENTER button to store the selection. If
enabled, the power off function shuts off the DSM403SD after a period of inactivity of
ten minutes.
6. Enable or disable the beeper
. Once the auto power off function has been enabled
or disabled, the display will show the word “yES” over the word “bEEP”. Press the
▼
button until the desired setting (“yES” or “no”) is displayed, and then press the
REC/ENTER button to store the selection as the default.
7. Set the datalogging sampling time
. Once the beeper has been enabled or disabled, the
display will show a value above the letters “SP-t”. Press the
▼
or
▲
button to decrease
or increase the value until the desired sampling time appears above “SP-t”. The options
are 0, 1, 2, 5, 10, 30, 60, 120, 300, 600, 1800 and 3600 seconds (0 seconds to 1 hour).
8. Format the SD card
. Once the sampling time has been set and stored, the term “Sd-F”
will appear in the lower half of the display. Press the REC/ENTER button.
Pressing the REC/ENTER button causes the word “no” or “yES” to appear over the term
“Sd-F”. Press the
▼
button to make a selection. Choose “yES” whenever a new SD card is
being used, or when a used card is being repurposed (from use with another SD card
instrument or a camera, for example) and all data on it is to be erased. Choose “no” to
preserve any data on a card previously used with this instrument.
If you choose “yES”, after you press the REC/ENTER button the instrument will prompt you
to confirm that decision by displaying the term “Ent” below “yES” and sounding three
beeps. To confirm that you want to begin the erasure/formatting procedure, press the
REC/ENTER button. “Ent” will then flash several times and the instrument will sound
another three beeps to confirm that the SD card has been erased and formatted.
Once the SD card has been formatted (or not), the display will then either return to the first
of the six steps in the setup sequence—setting the current date and time—or show the
term “ESC”. If “ESC” appears, press the POWER/ESC button to exit the setup procedure and
enter normal operating mode.
CALIBRATING THE METER
The DSM403SD must be calibrated before it can make accurate sound level
measurements.
1. To prepare for calibration
, obtain an optional sound calibrator and mate its output
connector with the head of the DSM403SD’s microphone (callout 1-9 of Fig. 1). Power on
the sound calibrator and manually set its range to 50 to 100 dB.
2. On the DSM403SD
, manually set its range to 50 to 100 dB as well by pressing the
▲
button (which has the word “Range” stenciled above it) once. The display will then show
the first of three range options: “30 – 80”. Press the
▲
button again and the display will
show the second option: “50 – 100”. Press the REC/ENTER button to select and store
this range.
