3. To switch from fast time weighting (the meter’s default setting) to slow time
weighting
, press the SET button, which has the term “Fast/slow” stenciled below it.
Press either the or button until the word “SLOW” appears on the display. Press the
REC/ENTER button to select and store this setting as the temporary default.
Once you have set these three parameters (or kept the meter’s default settings), you are
ready to make sound level measurements.
4. To make a sound level measurement
, point the condenser microphone at the top of the
meter in the direction of the sound source. The display will show its volume, in dB units.
Whenever the meter is in measurement mode, you can turn off the backlight (which is on
by default) by briefly pressing (but not holding) the POWER/ESC button. To reactivate the
backlight, briefly press the button again.
HOLDING AND STORING MEASUREMENTS
1. To hold a measured value
, press the HOLD/NEXT button during the measurement.
Doing so will cause the word “HOLD” to appear at the top of the display. Pressing the
HOLD/NEXT button again releases the hold.
2. To record and recall readings
, press the REC/ENTER button while making measure -
ments. This will make the term “REC” appear at the top of the display. Pressing the
REC/ENTER button again, briefly, will make the term “MAX” appear to the right of
“REC” and switch the display to the maximum value stored in memory during the last
recording session. Pressing the REC/ENTER button again, briefly, will make the term
“MIN” appear to the right of “REC” and switch the display to the minimum value stored
during the last session.
3. To hold a maximum reading
, press the LOGGER button (which has the words “Peak
Hold” stenciled below it) while in recording mode. To release the hold, press the
LOGGER button again.
4. To exit recording mode
, press the REC/ENTER button and hold it for at least three
seconds, until the term “REC” disappears from the top line of the display. The display will
then revert to showing the current reading.
AUTOMATIC VS. MANUAL DATALOGGING
The HHSL402SD can automatically log data at a user-selected sampling period from
1 second 3,600 seconds (one hour). To view the sampling time that the instrument has
been set up to use, press the button (which has the words “Sampling check” stenciled
below it) once. To change the sampling time, perform Step 7 of the setup procedure.
1. To start automatic datalogging
, press the REC/ENTER button once. The top line of the
display will show the term “REC”. Pressing the LOGGER button at this point will make
REC flash and add the flashing term “LOGGER” at the top right of the display. This
indicates that the instrument is currently storing measured values and their time stamps
in memory.
2. To pause automatic datalogging
, press the LOGGER button once; this action makes the
flashing term “LOGGER” disappear from the top right of the display and changes the
term “REC” from flashing to constant. Pressing the LOGGER button again resumes
automatic datalogging.
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