Sper scientific 840012 User manual

Detachable Probe
Sound Meter
840012
Instruction Manual

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CONTENTS
1. Introduction .................................................................................................. 3
2. Meter Description ........................................................................................ 3
3. Operating Instructions
3-A Measuring Procedures .......................................................................... 4
3-B Hold........................................................................................................ 4
3-C Rec. Max/Min .....................................................................................4-5
3-D Max. Hold .............................................................................................. 5
3-E Signal Output......................................................................................... 5
3-F Calibration.............................................................................................. 5
3-G Precautions ........................................................................................... 5
3-H Auto Shut O󰀨......................................................................................... 6
3-I Battery Replacement .............................................................................. 6
3-J RS232 PC Serial Interface .................................................................... 6
4. Specications............................................................................................... 7
5. Frequency Weighting (A and C) Characteristics ........................................ 8
6. Warranty ...................................................................................................... 8

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1. INTRODUCTION
Features a detachable probe for easy replacement, and both RS232
computer interface and AC outputs. Also has A and C decibel frequency
weighting scales, fast or slow time weighting, and two hold functions. Meets
IEC61672 class 2 and ANSI S1.4 type 2 frequency and time weighting
specications. Covers 30 to 130 dB in both Manual and Auto ranging scales
with 0.1 dB resolution and an accuracy of ±1.5 dB. Calibrate in compliance
with OSHA using Acoustical Calibrator 840031 or equivalent. Has a fold-out
easel back and a tripod screw.
2. METER DESCRIPTION
1. Microphone
2. Probe Holder
3. Probe Handle
4. BNC Plug
5. BNC Socket
6. LCD display
7. Power Button
8. Hold Button
9. Rec./Max./Min
10. Max. Hold Button
11. A/C Button
12. Fast/Slow Button
13. Range Button
14. AC Output
15. Cal. Adjustment
16. RS232 Output
17. Easel
18. Battery
1
2
3
4
5
6
789
10 11
12 13
14
15
16
17
18

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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 at 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 nd the appropriate range using the
RANGE (13) button.
• The manual selections are: 30 to 80dB, 50 to 100db, or 80 to 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 o󰀨.
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.

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NOTE:
The Max/Min values are frozen and not updated until the meter returns to
recording mode.
• To return to recording mode, press the HOLD (8) button. “REC” is
displayed without “Max” or “Min”.
• To erase the recorded Max/Min values and exit the recording mode, press
the REC MAX/MIN (9) button for at least 2 seconds.
3-D. MAX HOLD: (Holds the max measurement on the display.)
Press the MAX HOLD (10) button, “P.H” appears on the LCD.
Press the MAX HOLD (10) button again to exit this function.
NOTE:
Select auto range when using this function in slow varying noise
environments. Select the appropriate manual range when using this function
in pulsing noise environments.
3-E. AC OUTPUT
The 3.5 mm diameter AC OUTPUT (14) may be used to connect the unit to
an external output device, such as an analyzer, recorder, or controller.
3-F. CALIBRATION
• The meter’s CAL (15) adjustment is located on the side of the unit.
• Use Sper Scientic’s 2 Pt. Acoustical Calibrator 850016 (or equivalent) to
calibrate the unit in compliance with OSHA.
• Press the POWER (7) button to turn the unit on.
• Turn the acoustical calibrator on and place it onto the
meter’s MICROPHONE (1)
• To calibrate the meter to 94 dB, select the 50 to 100 dB range,
FAST response, and “A” weighting.
• Use the calibration screw driver to gently turn the CAL (15) adjustment until
the display reads 94.0.
• To calibrate the meter to 114 dB, select the 80 to 130 dB range, FAST
response, and “A” weighting and turn the CAL (15) adjustment until the
display reads 114 dB.
3-G. PRECAUTIONS
• Do not store or operate the unit in high temperatures or in
high humidity for long periods.
• Keep the microphone dry.
• Do not force the CAL (15) adjustment, doing so may damage
the mechanism and void the warranty.

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3-H. AUTOMATIC SHUT OFF
After approximately 10 minutes without activity (with no buttons pushed),
the meter will automatically shut o󰀨. To disable this feature, press the
REC (9) button.
3-I. BATTERY REPLACEMENT
When the low battery icon is displayed, open the BATTERY (18)
compartment to install a fresh 9V alkaline or heavy duty type battery. In-spec
measurements may be made for several hours after the icon appears.
3-J. RS232 PC SERIAL INTERFACE
The instrument features RS232 (16) output via a 3.5 mm terminal. The
signal output is a 16-digit data stream that can be adapted to user-dened
applications. A RS232 lead with the following connection is required to link
the instrument with the PC serial interface.
The 16 digit data stream will be displayed in the following format:
D15D14D13D12D11D10D9D8D7D6D5D4D3D2D1D0
Each digit indicates the following status:
D0 End word
D1 & D8 Display reading, D1 = LSD, D8 =MSD.
Example: Display reads 1234, then D8 to D1 is
00001234
D9 Decimal Point (DP), position from right to left
0 = NO DP, 1 = 1 DP, 2 = 2 DP, 3 = 3DP
D10 0=Positive, 1=Negative
D11 & D12 Indicator for Display, dB = 17
D13 1
D14 4
D15 Start word
Meter (3.5 mm jack plug) PC (9W ‘D” Connector)
Cent er Pin ............................... Pin 4 Pin 2 2.2 K
Ground/shield .......................... Pin 2 Pin 5 resistor

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4. SPECIFICATIONS
Display 2″ x 1.25″ LCD (52x32mm),
5 digits with indicator.
Functions dB ( A & C Frequency Weighting), Response
(Fast, Slow), Hold, Memory (Min/Max), Max.
Hold, AC Output, RS232 Output
Measurement Range 30 to130 dB
Resolution 0.1 dB
Range Selector 30 to 80dB, 50 to 100dB, 80 to 130dB,
50dB on each step, over/under range indicator.
Auto Range: 30 to 130dB
Accuracy ±1.5 dB
Frequency 31.5 Hz to 8,000 Hz
Microphone Electric condenser microphone,
Dia. .5″ (12.7mm)
Response
(Fast/Slow)
Fast (F): t = 200 ms
Slow (S): t = 500 ms
Calibration VR Built-in external calibration VR for easy
calibration using a standard 94 dB calibrator.
Output Signal AC output: AC 0.5 Vrms corresponding
to each range step.
Output impedance:
600 ohm
Slow (S): t = 500 ms
Output Terminals RS232, AC, 3.5mm diameter jack
Operating Temp. 32 to 122°F (0 to 50°C)
Operating Humidity Less than 80% RH
Power Supply One 9V battery, heavy duty or alkaline type
Power
Consumption
Approximately DC 6 mA
Weight Weight: 8 oz (225 g) with battery
Dimension Meter 10.6 x 2.7″ x 1.1″ (268 x 68 x 29mm).
Probe 6.7″ x 1″ x .7″ (170.5 x 24.5 x 19mm)
Probe cord length: 78.7″ (200cm)
Included Accessories Windscreen, calibration tool, instructions, 9V
battery, hard-shell foam-lined carrying case
Optional Services
& Accessories from
Sper Scientic
840012C NIST Traceable Cert. of Calibration
850016 2 Pt. Acoustical Calibrator
840057 RS232 Cable
840090 Water Resistant Instrument Pouch
850080 Software
840093 Field Tripod

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WARRANTY
Sper Scientic warrants this product against defects in materials and
workmanship for a period of ve (5) years from the date of purchase,
and agrees to repair or replace any defective unit without charge.
If your model has since been discontinued, an equivalent Sper
Scientic product will be substituted if available. This warranty does
not cover probes, batteries, battery leakage, or damage resulting
from accident, tampering, misuse, or abuse of the product. Opening
the meter to expose its electronics will break the waterproof seal and
void the warranty. To obtain warranty service, ship the unit postage
prepaid to:
SPER SCIENTIFIC LTD.
8281 E. Evans Rd., Suite #103
Scottsdale, AZ 85260
[phone]
The defective unit must be accompanied by a description of the
problem and your return address. Register your product online at
www.sperwarranty.com within 10 days of purchase.
Revised 8/17/2017
5. FREQUENCY WEIGHTING (A and C) CHARACTERISTICS:
Meets IEC 61672 class 2, calibrating input signal on 94 dB (31.5Hz to 8kHz).
Frequency dB A dB C Tolerance dB
31.5 -39.4 -3 ± 3
63 -26.2 -0.8 ± 2
125 -16.1 -0.2 ± 1.5
250 -8.6 0 ± 1.5
500 -3.2 0 ± 1.5
1k 0 0 ± 1.5
2k 1.2 -0.2 ± 2
4k 1.0 -0.8 ± 3
8k -1.1 -3 ± 5