Sper scientific 840012 User manual

Detachable Probe

Sound Meter

840012

Instruction Manual

2 PB

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

3 PB

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

789

10 11

12 13

4 PB

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.

5 PB

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.

6 PB

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

7 PB

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

8 PB

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

(480) 948-4448

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

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