Sper Scientific 840012 Sound Meter with Detachable Probe - Manual (Page 4)

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3. OPERATING INSTRUCTIONS
3-A. MEASURING PROCEDURES - See section 2, page 3 for button
locations and descriptions.
• Connect the BNC PLUG (4) to the BNC SOCKET (5).
• Slide the PROBE HANDLE (3) into the PROBE HOLDER (2) (opt).
• Press the POWER (7) button to turn the unit on.
• The default mode is: Auto range, “A” frequency weighting and Fast
time weighting.
• To change the frequency weighting, press the A/C (11) button.
• The "A" frequency weighting simulates human ear response. For
an environmental sound measurement, select the "A" weighting.
• The "C" weighting approximates a flat response. Often, "C" is
used to check the noise of machinery where the target sound level
is already known.
• For more information about Frequency Weighting Characteristics,
see the chart on page 8.
• Point the MICROPHONE (1) at the sound source.
• Use the auto range setting (default) or find the appropriate range
using the RANGE (13) button.
• The manual selections are: 30~80dB, 50~100db, or 80~130db.
• If “- - - - -” is displayed, switch to another range. The sound level is
displayed in decibels (dB).
• For general applications, press the FAST/SLOW (12) button to
select "Fast", simulating the human ear's response time.
• The "Slow" setting is generally used to obtain an average of
vibrating sound levels.
• Press the POWER (7) button to turn the unit off.
3-B. HOLD
• During the measuring procedure, press the HOLD (8) button to
freeze the display.
• "HOLD" and the last measurement are displayed.
• Press the HOLD (8) button again to exit this function.
3-C RECORD MAXIMUM / MINIMUM MEASURMENTS
• Press the REC MAX/MIN (9) button once to enter the recording
mode. "REC" and the recorded values are displayed and
continuously updated.
• Press the REC MAX/MIN (9) button as needed to view the
recorded Max and Min values. "REC Max" and the maximum
recorded value, or "REC Min" and the minimum recorded value
are displayed.