Sper Scientific 840015 Sound Meter Type 1 User Manual
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3. OPERATING INSTRUCTIONS
3-A. Measurement Procedures
Slide the POWER (6) selector to the "I" (on) position.
For general applications, slide the MAX HOLD / INSTANT (8) selector to
the INSTANT position.
To freeze the displayed reading, slide the MAX HOLD / INSTANT (8)
selector to the MAX HOLD position.
Press the RESET (10) button once to reset maximum hold to the current
reading.
Slide the FREQUENCY WEIGHTING (11) selector to the "A" or "C"
position. The "A" frequency weighting simulates human ear response.
During an environmental sound level measurement, select the "A"
weighting. The "C" weighting approximates a flat response. Typically,
"C" is used to check the noise of machinery where the target sound level
is already known. (See Frequency Weighting Characteristics, page 6.)
Slide the TIME WEIGHTING (7) selector to the "F" (fast) or "S" (slow)
position. For general applications, select "F" which simulates the human
ear's response time. The "S" setting is used to obtain an average of
vibrating sound levels.
Find the appropriate measuring range using the RANGE (5) selector. If
the OVERLOAD INDICATOR (3) appears in the upper-left display, slide
the RANGE (5) selector to another setting.
Point the microphone at the sound source. The sound level will be
displayed in decibels (dB).
When finished, slide the POWER (6) selector to the "O" (off) position.
3-B. General Application Settings
Set POWER / CALIBRATION (6) selector to "I" (on).
Set TIME WEIGHTING (7) to "F".
Set MAX HOLD / INSTANT (8) selector to INSTANT.
Set FREQUENCY WEIGHTING (11) to "A".
Set RANGE (5) selector to the appropriate range.
3-C. Signal Output
The 3.5 mm diameter SIGNAL OUTPUT (12) terminal may be used to
connect the unit to an external device (analyzer, recorder, controller, etc).
3-D. Precautions
Do not store or operate the unit in high temperatures or in a high
humidity environment for long periods.
Keep the microphone dry and avoid intense vibrations.