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© Monarch Instrument 2002 all rights reserved
1071-8051-210
Datalogging Sound Level Meter
Monarch 322
15 Columbia Drive
Amherst, NH 03031-2334 USA
Phone: (603) 883-3390
Fax: (603) 886-3300
E-mail: support@monarchinstrument.com
Website: www.monarchinstrument.com
MONARCH INSTRUMENT
Instruction Manual
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4. This instrument is not user serviceable. For technical
3. When making measurements in high noise
2. Do not use this instrument in any manner inconsistent
1. Read and follow all instructions in this manual carefully,
with these operating instructions or under any
conditions that exceed the environmental
assistance, contact the sales organization from which
you purchased the product or Monarch
Instrument directly.
environments, be sure to use proper hearing protection.
specifications stated.
and retain this manual for future reference.
Safeguards and Precautions
referencing this clause.
SELLER warrants that any software supplied will operate in accordance with the
documentation or manual supplied therewith in all material respects when used in strict
compliance with such documentation or manual. Notwithstanding the foregoing, BUYER
acknowledges that, since software is complex and therefore may have defects, BUYER’s
sole and exclusive remedy for any such defects or breach of this warranty shall be to
require SELLER, within a reasonable period of time, to provide all reasonable programming
services to correct programming errors in the software. Except as provided above SELLER
MAKES AND BUYER RECEIVES FROM SELLER NO EXPRESS OR IMPLIED WARRANTIES
OF ANY KIND WITH RESPECT TO ALL OR ANY PORTION OF SOFTWARE AND BUYER
HEREBY AGREES AND ACKNOWLEDGES THAT IT ACCEPTS THE SOFTWARE IN ‘AS IS’
CONDITION. SELLER HEREBY EXPRESSLY EXCLUDES ANY IMPLIED WARRANTIES
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO
THE SOFTWARE. BUYER agrees that any specific right or remedy granted to BUYER
hereunder with respect to any breach or default by SELLER shall be in lieu of all other
rights and remedies otherwise available to BUYER at law or in equity as the result of such
breach or default, regardless of whether based on contract, tort, strict liability, or other
theory of liability.
IN NO EVENT SHALL SELLER BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, OR PUNITIVE LOSSES OR DAMAGES (INCLUDING, BUT NOT
LIMITED TO, LOSSES OR DAMAGES FOR ANY LOST PROFITS OR LOST DATA) AS THE
RESULT OF ANY BREACH OR DEFAULT BY SELLER WITH RESPECT TO THE HARDWARE
OR SOFTWARE, EVEN IF SELLER HAS BEEN ADVISED OR MADE AWARE OF THE
POSSIBILITY OF ANY SUCH LOSSES OR DAMAGES AND REGARDLESS OF WHETHER
THE CLAIM IS BASED ON CONTRACT, TORT, STRICT LIABILITY, OR OTHER THEORY OF
LIABILITY.
This limited warranty does not extend or apply to consumables (including, but not limited
to, lamps and batteries, if applicable) or equipment, instruments or accessories which are
warranted separately by the original manufacturer of these items.
SELLER warrants hardware products to be free from any defect in materials or workmanship
for a period of one (1) year from date of shipment to BUYER. SELLER’s entire liability and
BUYER’s sole and exclusive remedy resulting from any defect in workmanship or material
in the hardware product covered by this limited warranty shall be limited to and fully
discharged by the SELLER’s option of replacement or repair of such item without charge.
The limited warranty provided in this clause is in lieu of all other warranties, expressed or
implied, arising by law or otherwise. ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE EXCLUDED. This limited warranty
shall not be modified except by an arrangement signed by both parties specifically
LIMITED WARRANTY
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Importer (Amherst, NH) Alan Woolfson, VP Engineering (Authorized Signature)
th
March 2001
and therefore conforms in accordance with 89/336/EEC-EMC Directive. The
testing of this product was performed by GesTek EMC Lab. in March of
2001. (Ref. No. 0102072E).
EMC: EN55011/1991 Class B
to which this declaration relates is in conformity with the following standards:
Name: Sound Level Meter
Model: Monarch 322
DECLARATION OF CONFORMITY
EN50082-1/1997 / EN61000-4
declares that the product:
15 Columbia Drive, Amherst NH 03031 USA
Division of Monarch International Inc.
Monarch Instrument
8.0 Recording and Viewing Options..................................................................
7.3 Main Menu ....................................................................................................................
7.4 Graph ............................................................................................................................
7.6 Statistic 1 ......................................................................................................................
7.7 Graphical Display.........................................................................................................
7.8 Statistic 2 ......................................................................................................................
8.2 Downloading Stored Data to PC ..............................................................................
8.3 Recording in Real Time to the Computer ...............................................................
8.4 Failure to Achieve a Connection .............................................................................
8.5 Saving Real Time Data .............................................................................................
7.9 DataLogger ...................................................................................................................
8.1 Recording to the Instrument Only ..............................................................................
7.5 Tool Bar ........................................................................................................................
7.0 TestLink SE-322 – RS232 Interface Software ..................................
6.3 Taking Readings ..........................................................................................................
7.2 Installation Procedure .................................................................................................
6.4 Preparation for Storage...............................................................................................
7.1 Installation Requirements ...........................................................................................
6.0 Operating Instructions........................................................................................
5.3 Installing Acoustic Calibrator .....................................................................................
5.4 Adjusting Calibration...................................................................................................
6.2 Instrument Placement .................................................................................................
5.5 Re-calibration ...............................................................................................................
6.1 Preparation for Measurement .....................................................................................
5.0 Calibration Procedure .........................................................................................
4.3 Time Weighting Selection ...........................................................................................
4.4 Level Selection.............................................................................................................
4.6 Recording Interval Setup ............................................................................................
4.7 Recording Data ............................................................................................................
4.8 MAX / MIN Function .....................................................................................................
4.9 Auto Power Off.............................................................................................................
4.10 Low Battery Condition.................................................................................................
4.11 Digital Output ...............................................................................................................
5.2 Calibration Settings .....................................................................................................
4.12 AC and DC Output Signals..........................................................................................
5.1 Calibration Requirements ...........................................................................................
4.5 Clock Set.......................................................................................................................
MODEL 322 DATALOGGING SOUND LEVEL METER
Section Page
1.0 Introduction.................................................................................................................
2.0 Specifications............................................................................................................
3.0 Symbol Definitions and Feature Locations ........................................
4.0 Control Functions ...................................................................................................
4.2 Frequency Weighting Selection .................................................................................
4.1 Power and Backlight....................................................................................................
Table of Contents
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MODEL 322 DATALOGGING SOUND LEVEL METER
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Out of Range Indication: Displays ‘OVER’ when over range for bargraph scale selected
Displays ‘UNDER’ when under range for bargraph scale selected
Displays ‘-LO.-’ when under range by at least 20 dB
MAX/MIN hold: Maximum and Minimum RMS value hold
Internal memory: 32,000 records
Digital output: Bi-directional RS232. Software and cable included
AC output: 0 - 1Vrms over scale range selected
Approx. 100 ȍ output impedance
DC output: 10mV/dB
Approx. 1 Kȍ output impedance
Power requirement: 9 Volt battery, NEDA 1604 or JIS 006P or IEC 6F22
Battery life: Approx. 50 hours with alkaline battery. Low battery indication
Option: AC Adaptor: 9Vdc (8-15Vdc Max.) @ 30mA, 3.5mm (+), 1.35mm (-)
Dimensions:
Weight: Approx. 285g (10.0 oz)
Accessories: Windscreen, Battery, Carrying Case, 3.5mm Plug, Screwdriver, Instruction
10 - 75% RH Non-condensing
x Altitude up to 2000 meters (6500 feet)
275×64×30mm (10.8×2.5×1.2 in)
Operating Conditions:
x Operating Temperature and Humidity: 0°C - 40°C (32°F - 104°F);
10 - 90% RH Non-condensing
x Storage Temperature and Humidity: -10°C - 60°C (14°F - 140°F);
Accuracy: ±1.5dB (under reference conditions, 94dB @ 1KHz)
Update Rate: 50mS
Resolution: 1dB
Analog display: 50 segment bargraph
Resolution: 0.1dB
Update Rate: 0.5 sec.
Digital display: 4 digits
Auto: 30 - 130 dB
Frequency range: 31.5Hz - 8KHz
Frequency weighting: A, C
Time weighting: Fast (125mS), Slow (1 sec.)
Microphone: 1/2 inch electret condenser microphone
Dynamic range: 50 dB
Scale Ranges: Low: 30 - 80dB
Medium: 50 - 100 dB
High: 80 - 130 dB
2.0 Specifications:
autoranging over the range of 30 to 130 db and complies with IEC651 Type 2 and ANSI S1.4
Type 2 standards. It is provided with both an AC output of 0-1Vrms over the full scale of the
range selected and a DC output of 10mV/dB. It has an internal data storage capability of
32,000 records and is equipped with a RS232 interface for bi-directional communication with
a PC.
Standard Compliance: IEC651 Type 2, ANSI S1.4 Type 2
Measurement range: 30 - 130dB
measurements of sound pressure levels in industrial and environmental applications. It is
equipped with A and C frequency weighting and Fast and Slow time weighting. It is
1.0 Introduction:
This instrument is a Type 2 Datalogging Sound Level Meter intended for general-purpose
Manual, Software, RS232 Cable
file type in which to save the data.
Files may be saved in any of three file formats: binary file (*.ghf), text file (*.txt) or Excel
format file (*.csv). The *.ghf file uses considerably less disk space to save the data than
the other two file formats, but it can only be used in TestLink SE-322. Text files can be
opened by TestLink SE-322 and any other word processor program such as Microsoft
Word, Notepad, etc. An EXCEL format file can be opened by TestLink SE-322 and
Microsoft Excel.
8.5 Saving Real Time Data
Click on the graph window to be saved and choose ‘File’ – ‘Save’ from the main menu or
click on the tool bar. A ‘Save As’ menu will appear to define a file name and select the
8.4 Failure to Achieve a Connection
the information displayed on the instrument panel on the PC will be the same as that on
the actual sound level meter display, and the buttons on the PC panel may be used to
control the actual instrument. In the event of failure to properly connect, see Section 8.4
below.
When the connection is successfully completed, click to start recording. A ‘Real-Time
Setup’ menu will appear to select the total number of samples to be taken and the
sampling rate. As these selections are made, the ‘Recording Period’ will be updated and
displayed. When the desired conditions are set, click ’Start’ to begin recording. The real
time measurement of sound pressure level will graph on the display at the sample rate
selected.
To terminate real time recording prior to completion of the duration selected, click .
When establishing a connection between the sound level meter and the PC, first be sure
the proper COM Port is selected. Note that certain programs operating in the background
may hold control of the serial ports, which could cause the computer not to recognize the
COM port selected for this program. If the connection fails, the screen panel will display
‘No Connection’.
8.3 Recording in Real Time to the Computer
instructions and information for downloading data and subsequently working with these
data are described in Section 7.9, DataLogger. In the event of failure to properly connect,
see Section 8.4 below.
Power on the sound level meter. Then connect it to the PC with the RS232 cable
provided and start the TestLink program. In the ‘View’ drop down menu, select both
‘Control Panel’ and ‘Real Time Graph’ to be displayed. If the connection is successful,
Recorded data internally stored in the sound level meter may be downloaded directly to
a PC by connecting the instrument to the PC with the RS232 cable supplied. Further
MODEL 322 DATALOGGING SOUND LEVEL METER
8.2 Downloading Stored Data to PC
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8.0 Recording and Viewing Options:
8.1 Recording to the Instrument Only
The DataLogger program will automatically transfer the first data set to the graph. Any
Any number of blocks of data up to the capacity of the sound level meters’ internal
storage capacity may be made in accordance with the instructions in Section 4.7.
Note: Ensure Recording Interval Setup has been completed per instructions in
Section 4.6.
data set listed may be graphed by clicking on that line in the chart.
7.9 DataLogger
between the cursor lines, and the average sound level for the time period between the
lines. This data changes as the cursor lines are moved on the graph.
To download any number of stored blocks of data, power on the sound level meter,
connect the instrument to the PC with the cable provided, start the TestLink program and
select ‘DataLogger’ from the main menu or click from the tool bar. A progress
indicator will appear on the screen indicating the downloading in process. When
complete, the screen will split and a record of stored data blocks will be displayed in
tabular format on the left of the screen and graphical format on the right of the screen.
The tabular view will identify the data set number, date of recording, start time of each
record block, the sampling rate and the total number of samples recorded. A sample
Data Set chart is shown below.
7.8 Statistic 2
The section of the graph identified above as ‘Statistic 2’ displays statistical information
relative to the recorded data between the two cursor lines, including the value and time
for each cursor, the maximum and minimum values and corresponding times recorded
MODEL 322 DATALOGGING SOUND LEVEL METER
-LO.-
dBC : C frequency weighting mode
: Low battery indication. Battery voltage is not sufficient for proper operation.
: Indicates value is under range by at least 20 dB.
AUTO : Indicates ‘Auto Level Range’ selected.
FULL : Indicates instrument memory is full.
dBA : A frequency weighting mode
: Indicates ‘Auto Power Off’ is enabled.
TIME : Indicates ‘Hour: Minute: Second’ displayed on secondary display.
REC : Indicates instrument is recording data.
DATE : Indicates ‘Year: Month: Day’ displayed on secondary display.
: Analog (bargraph) scale range.
SLOW : Slow time weighting mode (1 Sec.)
OVER : Value is over range for bargraph scale selected.
FAST : Fast time weighting mode (125mS)
MIN : The Minimum value is now being displayed.
MAX : The Maximum value is now being displayed.
UNDER : Value is under range for bargraph scale selected.
3.0 Symbol Definitions and Feature Locations:
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MODEL 322 DATALOGGING SOUND LEVEL METER
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2) LCD display 10) Offset calibration screw
3) ON/OFF button 11) Digital output connector (RS232)
4) MIN/MAX button 12) AC and DC output signals connector
5) Record button 13) AC Power Adaptor connector
6) Frequency weighting button 14) Tripod connector
7) Time weighting button 15) Battery compartment cover
8) Level range control button
Feature Locations:
1) Windscreen 9) Half inch electret microphone
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POWER-UP OPTIONS
Auto=
Med=
Hi =
503080
100 dB
130 dB
130 dB
CLOCK
REC
MAX
30Lo =
80 dB
MIN
SETUP
LEVEL
SLOW
A
FAST
INTV
C
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MANUAL FOR SAFETY
NEDA 1604 6F22 006P
PLEASE READ
OPEN
9V BATTERY
MODEL 322 DATALOGGING SOUND LEVEL METER
7.5 Tool Bar
Displays or hides Statistic1.
7.4 Graph
A sample graph is shown below. Descriptions of the identified elements of this graph
follow.
selected points in time. These may be moved either by clicking on
them on the chart and dragging to the desired point in time or by
dragging the slider located below the chart. The time and sound level
value for each is displayed to the top right of the cursor lines.
Cursor Lines Two adjustable cursor lines are provided to numerically display data at
Zoom Function Clicking on the display and dragging the cursor will define a zoom
area.
7.7 Graphical Display
for the entire recorded period, and the maximum and minimum values experienced along
with their corresponding times of occurrence.
Zoom and cursor functions are accessible on the graphical display as follows.
7.6 Statistic 1
The section of the graph identified above as ‘Statistic 1’ displays statistical information
relative to the entire recorded time, including the start time of this recording session, the
sample rate selected, the total number of data points selected, the average sound level
Export Statistic Copies this statistic section to the clipboard for use in other programs.
Undo Zoom Cancels a zoomed display and returns to full graph.
Graph Option Brings up box to customize display.
Clears last action taken.
Note: The customization box may also be retrieved by double clicking
cross sign where placed.
Turns the cursor into a vertical bar on the graph. Click on the graph to bring up a
text box which will annotate the graph where this bar is placed.
Normal cursor
Turns the cursor into a cross sign on the graph. Click on the graph to mark a
Displays or hides Statistic2.
on the graph.
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MODEL 322 DATALOGGING SOUND LEVEL METER
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7.0 TestLink SE-322 (
Window: Controls tiling or cascading displayed windows and lists open windows.
COM Port: Provides for the selection of the operative COM port.
Help: Online help information.
format.
View: Provides for selection of windows to be displayed.
Real Time Graph:
Control Panel: The Control Panel window emulates the sound level meter panel
to control the connected meter via the buttons in this window.
The Real-Time Graph window displays resent data in graphical
sound level meter.
7.3 Main Menu
Real Time: Starts and stops the collection of real time data.
DataLogger: The DataLogger window controls the loading of recorded data from the
Printing Files, determining Printer Settings, and Exiting files.
File: Provides basic logistic functions including Opening, Saving and
4. Type E:\SETUP and choose OK to copy TestLink.exe (executable file) and Help file to
your hard disk (default is c:\program files\TestLink\SE322).
7.2 Installation Procedure
1. Close all other application before installing TestLink software.
2. Insert setup CD into CD disk drive.
3. Choose the Start button on the Taskbar and select Run.
x Recommended display resolution is 800X600 or greater.
x Pentium 90 MHz PC, 32 MB RAM
x At least 5 MB hard disk space available for TestLink program files
Minimum Hardware Required
Operating System Required
Windows 95, Windows 98 or Windows NT 4.0
7.1 Installation Requirements
TestLink SE-322 Package
x 80mm CD
x Custom designed RS232 cable for TestLink
Sound Level Meter
6.4 Preparation for Storage
When measurements are completed and the instrument is to be stored, turn it off and
remove the battery when not in use. Always store the instrument in a cool and dry
environment.
)-RS232 Interface Software:
6.3 Taking Readings
Both the digital display and the analog bargraph will display current sound level readings
in the normal operating mode.
When the sound level drops from an interim high, the bargraph will maintain a bar at the
highest level reached for a brief moment after the level drops.
When in the MAX /MIN mode, the digital display will indicate the MAX or MIN as
selected, but the analog bargraph will still respond to actual changing noise conditions.
MAX MIN again after the last setting to complete the
process.
To abort during a setup process, press the button.
4.3 Time Weighting Selection
The time weighting selected is determined by the noise content and how rapidly it varies.
Fast: 125mS averaging time. The Fast time averaging mode is most commonly used to
observe the range of sound level variation in the measured environment. Because of the
environment is indicative of a substantial low frequency noise content.
C Weighting: Used for environments containing a significant low frequency noise
content, as the C weighting represents a more uniform response over a wider frequency
range including low frequencies.
A significant difference between A weighted and C weighted results in the same
The frequency weighting selected is determined by the measurement application.
A Weight ing: Used for safety compliance and worker exposure applications, as the A
weighting most accurately emulates the frequency response of the human ear.
4.2 Frequency Weighting Selection
When first powered on, the display will show how much memory
space is available for use, as shown to the right.
The button turns both the instrument power and the display
backlight ON or OFF. Press it once to turn the power ON. Every
subsequent momentary press toggles the backlight ON or OFF.
Press and hold this button for 3 seconds to turn the power OFF.
(30 – 80 dB), Medium (50 – 100 dB), High (80 – 130 dB) or Auto (30 – 130 dB) is
4.4 Level Selection
observing the average level over a long term. The slow response mode is required in the
IEC and ANSI standards for long-term worker exposure determinations.
The sound level range to be displayed is determined by the average sound level
experienced and the extremes of level variation about that average. Selection of Low
between the maximum and minimum levels, the average sound level may generally be
considered to be half way between the two. When there is a greater than 6 dB variation
in levels, the average is considered to be 3 dB below the maximum.
Slow: 1 Second averaging time. The Slow time averaging mode is commonly used for
and minimum sound levels experienced. When there is less than 6 dB difference
relatively short averaging time, Fast response mode more accurately displays maximum
4.5 Clock Setup
determined by the LEVEL button, which sequentially circulates the displayed range
through these selections with each press of the button. Note that if the average sound
level is outside the range selected in either direction, this will be indicated by the
appearance of UNDER or OVER on the display. In the event that the level is more than
20 dB below the lower end of the range selected, the display will indicate
To set the real time clock:
1. Press and hold A/C button and then power on the meter.
2. Press MAX MIN (clock). 3. Press REC (n) or LEVEL (p) to increase or decrease the
number, press MAX MIN to move to the next item. The
adjusting order is: year; month; day; hour; minute. Press
MODEL 322 DATALOGGING SOUND LEVEL METER
4.0 Control Functions:
4.1 Power and Backlight
-LO.-
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MODEL 322 DATALOGGING SOUND LEVEL METER
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DC: The DC output is 10mV/db with an output impedance of 1K ȍ. It is supplied to the
middle ring of the 3.5mm coaxial connector.
MEDIUM or HIGH scale limits.
Note: In the AUTO level range, the AC signal will default to the appropriate LOW,
coaxial connector.
approximately 100 ȍ. It is supplied to the tip of the 3.5mm
TX is a 5V normally high output port.
RX is a 5V normally high input port.
4.11 Digital Output
The RS232 Digital Output is a 9600 bps N 81 serial interface.
4.12 AC and DC Output Signals
The AC and DC output signals are combined on individual
rings of the output connector as shown to the right.
AC: The AC output is 0 - 1Vrms over the full scale of the
range selected. The output impedance of this signal is
AC Signal
DC Signal
Ground
4.10 Low Battery Condition
meter. The will not be displayed, indicating that ‘Auto Power Off’ is disabled.
When the battery voltage is at or below the minimum for proper operation, the
symbol will show on the display indicating that the battery must be replaced.
By default, the instrument powers on in the ‘Auto Power Off’ mode and will automatically
shut off 30 minutes after the last key operation or RS232 communication.
To disable this feature, press and hold the FAST SLOW button and then power on the
4.9 Auto Power Off
Note: Changing the frequency weighting between ’A’ and ‘C’ will automatically clear any
stored MAX and MIN values.
symbol and value. The next press of this button causes both the MAX and MIN symbols
to flash and the displayed value returns to the current reading. Each successive press of
the MAX MIN button circulates the display mode among these options.
To exit the MAX / MIN mode, press and hold the MAX MIN button for two seconds.
Once the appropriate weighting and level selections have been made, both the
Maximum and Minimum levels may be captured and sequentially displayed. Pressing the
MAX MIN button will first display the MAX symbol and value for the current
measurement series. Pressing the MAX MIN button again moves the display to the MIN
4.8 MAX / MIN Function
buttons. The display will show ‘CLR’ and ‘SURE’ indicating that the
memory has been cleared.
on simultaneously for at least 5 seconds, then release both
stop recording. To clear the memory, power off the meter, press
and hold the REC button followed by the button, holding both
4.7 Recording Data
Each momentary press of the REC button will alternately start and
number, press FAST SLOW to advance to the next item.
Press FAST SLOW again after the last setting to complete
the process.
To abort during a setup process, press the button.
3. Press REC (n) or LEVEL (p) to increase or decrease
1. Press and hold A/C button and then power on the meter:
2. Press FAST SLOW (interval):
4.6 Recording Interval Setup
To set the recording interval:
instrument should be mounted on a tripod at the boundary and facing the noise source.
Other situations may determine other placement criteria to accomplish the desired
measurement objective.
within two feet (if achievable) of the ear of a worker being tested for noise exposure, and
aimed in the general direction of the noise source. In the event of differing noise level
exposure at each ear, measurements should be taken for the ear experiencing the
highest incident noise.
Area Surveys: Locating the sound level meter will be governed by the purpose of an
area survey. If the purpose is determining noise nuisance at an adjacent boundary, the
MODEL 322 DATALOGGING SOUND LEVEL METER
6.0 Operating Instructions:
of the acoustic calibrator. Be sure the calibrator is seated
firmly against the top of the microphone, but do not
5.3 Installing Acoustic Calibrator
Insert the microphone housing carefully into the opening
Level range: 50 – 100 dB
MAX / MIN Mode: Disabled
5.2 Calibration Settings
Turn the instrument on and select the following settings:
Frequency weighting: A
Time weighting: Fast
any critical measurements or following any prolonged storage of the instrument.
Calibration requires the use of an optional Acoustic Calibrator providing a 94 dB, 1kHz
sine wave signal.
5.4 Adjusting Calibration
apply excessive force which could damage the
microphone.
Turn the acoustic calibrator on and observe the
displayed reading. If necessary, adjust the CAL
potentiometer on the side of the sound level meter to
MAX
MIN
SETUP
SLOW
AC
FAST
should be checked prior to and immediately after any critical measurements, or following
any prolonged storage of the instrument. In any event, the calibration of the instrument
5.5 Re-calibration
The sound level meter is supplied factory calibrated. As noted above, the calibration
94.0 dB ± 0.2 dB with the small screwdriver provided.
When re-checking calibration immediately following a
measurement, the instrument should repeat the
calibration setting without further adjustment.
POWER-UP OPTIONS
CLOCK
REC
Auto=
Med= 50
Hi = 8 0
Lo = 30
30
100 dB
130 dB
130 dB
80 dB
LEVEL
INTV
6.2 Instrument Placement
install a windscreen over the microphone to minimize wind interference. It is actually
good operating practice to leave the windscreen on the instrument at all times of
measurement to avoid extraneous interference from unknown air motion.
Note: The windscreen will not protect the microphone from moisture or contamination.
Turn the instrument on and adjust the frequency weighting, time weighting and scale
level in accordance with the provisions of Sections 4.2, 4.3 and 4.4 respectively. Disable
MAX / MIN (Section 4.8) until proper operating conditions have been established.
Proper placement of the instrument is critical to accurate measurements.
Worker exposure: Applicable standards require that the sound level meter be located
Take appropriate precautions to avoid prolonged use in dirty environments,
wetness or severe vibration.
6.1 Preparation for Measurements
Determine if the instrument is properly calibrated or requires calibration in accordance
with Section 5.0.
When being operated in an environment with a wind or airflow in excess of 10m/sec.,
should be verified no less than once per year.
5.0 Calibration Procedure:
5.1 Calibration requirements
Calibration of the sound level meter should be conducted prior to and immediately after
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Screwdriver
Calibrator
coustic
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