Larson Davis 831 User manual

Model 831
Sound Level Meter
Manual

I831.01 Rev O Manual
Larson Davis
Model 831 Manual

Copyright
Copyright 2016, by PCB Piezotronics, Inc. This manual is copyrighted, with all rights reserved. The
manual may not be copied in whole or in part for any use without prior written consent of PCB
Piezotronics, Inc.
Disclaimer
The following paragraph does not apply in any state or country where such statements are not
agreeable with local law:
Even though PCB Piezotronics, Inc. has reviewed its documentation, PCB Piezotronics Inc. makes no
warranty or representation, either expressed or implied, with respect to this instrument and
documentation, its quality, performance, merchantability, or fitness for a particular purpose. This
documentation is subject to change without notice, and should not be construed as a commitment or
representation by PCB Piezotronics, Inc.
This publication may contain inaccuracies or typographical errors. PCB Piezotronics, Inc. will
periodically update the material for inclusion in new editions. Changes and improvements to the
information described in this manual may be made at any time.
Record of Serial Number and Purchase Date
Model 831 Serial Number: ___________
Preamplifier Model: _________ Serial Number: ___________
Microphone Model: _________ Serial Number: ___________
Recycling
PCB Piezotronics, Inc. is an environmentally friendly organization and encourages our customers to
be environmentally conscious. When this product reaches its end of life, please recycle the product
through a local recycling center or return the product to:
PCB Piezotronics, Inc.
Attn: Recycling Coordinator
1681 West 820 North
Provo, Utah, USA84601-1341
where it will be accepted for disposal
Warranty
For warranty information, refer to our Terms and Conditions of Sale on our website,
www.larsondavis.com/TermsConditions.aspx.

I831.01 Rev O Manual
Table of Contents
Chapter 1 831 Features 1-1
Hardware Features ................................................................................................ 1-1
Basic Measurements ............................................................................................. 1-2
Basic Operation ..................................................................................................... 1-2
Available Options ................................................................................................. 1-3
Standard Accessories ............................................................................................ 1-4
Optional Accessories ............................................................................................. 1-5
Chapter 2 First Use 2-1
Unpacking and Inspection ..................................................................................... 2-1
Connecting the Microphone and Preamplifier ...................................................... 2-2
Connecting the Preamplifier ................................................................................. 2-3
Disconnecting the Preamplifier ............................................................................. 2-4
Powering the Model 831 ....................................................................................... 2-4
Chapter 3 Overview 3-1
831 Components ................................................................................................... 3-1
Summary of Displays and Icons ........................................................................... 3-7
Navigating and Selecting .................................................................................... 3-12
Basic Run Functions ........................................................................................... 3-12
Tab and Setting Displays .................................................................................... 3-13
Parameter Selection ............................................................................................. 3-20
Chapter 4 Basic Measurement Setup 4-1
Settings Screen ...................................................................................................... 4-1
Setup Tabs ............................................................................................................. 4-2
Exiting Settings Screen ....................................................................................... 4-15
Setup Manager .................................................................................................... 4-16
Chapter 5 Data Display 5-1
Data Labels ........................................................................................................... 5-1
Tabbed Structure ................................................................................................... 5-1
Live Tab ................................................................................................................ 5-2
Overall Tab ......................................................................................................... 5-12
C-A and Impulsivity ............................................................................................ 5-23
Session Log Tab .................................................................................................. 5-25
Adjust Graph Scale ............................................................................................. 5-29

View Spectrum Normalized ................................................................................5-30
Any Level Display ...............................................................................................5-41
Chapter 6 Run Control 6-1
Run Control Setup .................................................................................................6-1
Run Mode with Measurement History ..................................................................6-3
Run Modes Without Measurement History ...........................................................6-4
Chapter 7 Making a Measurement 7-1
Configuration of the System ..................................................................................7-1
Switching On the Model 831 .................................................................................7-1
Model 831 Setup ....................................................................................................7-3
Calibrating the Model 831 .....................................................................................7-3
Positioning the Model 831 .....................................................................................7-3
Performing the Measurement ................................................................................7-5
Storing the Measurement .....................................................................................7-15
Recovery After Improper Shutdown ...................................................................7-17
Chapter 8 Calibration 8-1
Calibration Overview .............................................................................................8-1
Control Panel - Calibrate .......................................................................................8-2
Acoustic Calibration ..............................................................................................8-5
Sensitivity Tab .....................................................................................................8-13
Calibration Without Preamplifier ........................................................................8-15
Certification .........................................................................................................8-16
E.A. Check ...........................................................................................................8-18
E.A. History .........................................................................................................8-20
Chapter 9 Industrial Hygiene 9-1
Measurement Setup ...............................................................................................9-1
Data Display ..........................................................................................................9-5
Chapter 10 Voice Recording 10-1
Control Panel - Voice Recording .........................................................................10-1
Voice Recorder ....................................................................................................10-2
Chapter 11 Time History 11-1
Metrics Logged ....................................................................................................11-1
Time History Setup ..............................................................................................11-4
Time History Display ..........................................................................................11-9

I831.01 Rev O Manual
Locate Record Number ..................................................................................... 11-16
Link to Measurement History Display .............................................................. 11-17
Markers ............................................................................................................. 11-18
Chapter 12 Measurement History 12-1
Run Control with Measurement History ............................................................. 12-1
Continuous and Timer Modes ............................................................................. 12-2
Timed Stop Mode ................................................................................................ 12-3
Manual and Stop When Stable Modes ................................................................ 12-5
Display of Measurement History Data ................................................................ 12-5
Storing a Measurement History ........................................................................ 12-11
Link to Time History ......................................................................................... 12-11
Chapter 13 Event History 13-1
Level Based Events ............................................................................................. 13-1
Event History Setup ............................................................................................ 13-2
Trigger Method ................................................................................................... 13-3
Event Time History Setup ................................................................................. 13-10
Event History Display ....................................................................................... 13-12
Link to Time History and Measurement History .............................................. 13-22
Chapter 14 FFT and Tonality 14-1
Accessing FFT Mode .......................................................................................... 14-1
Configuring a Measurement ................................................................................ 14-3
Viewing and Analyzing Results ........................................................................ 14-10
Storing Data ...................................................................................................... 14-21
Viewing Stored Data ......................................................................................... 14-21
Return to Sound Level Meter Mode ................................................................. 14-22
Chapter 15 RT-60 15-1
Accessing RT-60 Mode ...................................................................................... 15-1
Making a Measurement ....................................................................................... 15-3
Viewing and Analyzing Results .......................................................................... 15-8
Manually Controlling the Internal Noise Source .............................................. 15-16
Customizing Measurements .............................................................................. 15-20
Storing Data ...................................................................................................... 15-26
Viewing Stored Data ......................................................................................... 15-26
Quality Indicators .............................................................................................. 15-27
Accuracy Grade ................................................................................................. 15-28
Return to Sound Level Meter Mode ................................................................. 15-29

Chapter 16 Sound Recording 16-1
Sound Recording Types .......................................................................................16-1
Sound Recording Setup .......................................................................................16-2
Manual Sound Recording ....................................................................................16-7
Marker Initiated Recording ..................................................................................16-9
Event Sound Recording .....................................................................................16-14
Measurement History Sound Recording ............................................................16-18
Combined Sound Recordings ............................................................................16-19
Sound Recording Playback ................................................................................16-20
Chapter 17 Data Explorer 17-1
Control Panel - Data Explorer .............................................................................17-1
Data Explorer .......................................................................................................17-2
Chapter 18 System Properties 18-1
Control Panel - System Properties .......................................................................18-1
Device ..................................................................................................................18-2
Time .....................................................................................................................18-3
Power ...................................................................................................................18-5
Preferences .........................................................................................................18-10
Localization .......................................................................................................18-20
Displays .............................................................................................................18-23
Options ...............................................................................................................18-29
Logic I/O ............................................................................................................18-31
Chapter 19 Non-Acoustical Inputs 19-1
831-INT ...............................................................................................................19-1
Weather Measurement Using 831-INT ...............................................................19-2
Location Measurement Using 831-INT .............................................................19-10
Chapter 20 Communication 20-1
Control Panel - Communication ..........................................................................20-1
Modem Tab ..........................................................................................................20-3
Wireless Tab ........................................................................................................20-6
RS-232 Tab ..........................................................................................................20-8
SMS Out ............................................................................................................20-12
Network Tab ......................................................................................................20-13
Status Tab ..........................................................................................................20-15
Troubleshooting .................................................................................................20-20

I831.01 Rev O Manual
Chapter 21 Lock/Unlock the Model 831 21-1
Control Panel - Lock ........................................................................................... 21-1
Fully Locked ....................................................................................................... 21-5
Locked With Auto-Store ..................................................................................... 21-6
Locked With Manual-Store ................................................................................. 21-7
Calibration When The Model 831 Is Locked ...................................................... 21-8
Chapter 22 About 22-1
Control Panel - About ......................................................................................... 22-1
About ................................................................................................................... 22-1
Standards ............................................................................................................. 22-2
Options ................................................................................................................ 22-3
User ..................................................................................................................... 22-4
Chapter 23 System Utilities 23-1
Control Panel - System Utilities .......................................................................... 23-1
File System .......................................................................................................... 23-2
Chapter 24 Parameters Measured 24-1
Basic Sound Level Measurements ...................................................................... 24-1
Sound Exposure Metrics Measured .................................................................... 24-3
Statistical Metrics Measured ............................................................................... 24-4
Exceedance Counters .......................................................................................... 24-6
Miscellaneous Parameters ................................................................................... 24-6
Time History (831-LOG Required) .................................................................... 24-6
Measurement History (831-ELA Required) ....................................................... 24-6
Event History (831-ELA Required) .................................................................... 24-6
Chapter 25 Memory Utilization 25-1
Out Of Memory Stop .......................................................................................... 25-1
Overall Data ........................................................................................................ 25-1
Session Log ......................................................................................................... 25-1
Measurement History .......................................................................................... 25-2
Time History ....................................................................................................... 25-2
Events .................................................................................................................. 25-2
Voice Messages ................................................................................................... 25-3
Sound Recording ................................................................................................. 25-3
Bad Flash Blocks ................................................................................................ 25-4

Chapter 26 Upgrade Firmware and Options 26-1
SLM Utility-G3 ...................................................................................................26-1
Upgrading Model 831 Firmware .........................................................................26-2
Upgrading Options ..............................................................................................26-7
Appendix A Technical Specifications A-1
Standards Met by Model 831 ................................................................................A-1
Model 831 Specifications .....................................................................................A-2
CE Information ...................................................................................................A-20
1/1 and 1/3 Octave Filters ...................................................................................A-21
Position of Instrument and Operator ...................................................................A-30
Frequency Response ...........................................................................................A-32
Vibration Sensitivity ...........................................................................................A-62
Appendix B Measuring to IEC61672-1 B-1
Sections 5, 6, 7 and 9 (except 9.3) ........................................................................B-1
Appendix C Integrated Level Calculations C-1
Basic Integrated Level Calculations .....................................................................C-1
Community Noise Descriptors .............................................................................C-9
Appendix D Glossary D-1

Model 831 Manual 831 Features 1-1
CHAPTER
1831 Features
Welcome to the Larson Davis Model 831.This versatile
instrument, with graphic display, performs the functions of
several instruments; It puts the combined features of a
precision sound level meter and a real-time frequency
analyzer in the palm of your hand.
Hardware Features
The Larson Davis Model 831 has the following features:
• Precision integrating sound level meter
• 2 GB data storage
• 160 X 240 graphic LCD display with backlight and
icon-driven user interface
• Quiet Touch elastomeric keypad
• Large dynamic range > 120 dBA
• RMS Detectors: Slow, Fast & Impulse
• RMS Frequency Weighting:A, C & Z
• Peak Frequency Weighting: A, C & Z
• Any LevelTM: Simultaneous measurement and display
of Max and Min sound pressure levels (Slow, Fast and
Impulse detectors), plus Leq and Peak levels, all with
A, C and Z frequency weighting
• Weather Measurements (Wind Speed and Direction,
Temperature and Humidity)
• Jack for AC/DC output or headset microphone and
speaker
• Compatible with 61 m (200 ft.) microphone extension
cable (full scale to 20 kHz)
• 4-AA batteries provide upwards 8 hour operating
time
• Dust tight (IP53) durable plastic case with tripod
mount (tripod not included) and lanyard

1-2 Basic Measurements Model 831 Manual
• USB 2.0 full speed host connector for mass storage,
cellular and dial-up modems and future devices
• USB 2.0 full speed peripheral connector for control
and data download by a PC
• AUX control connector for USB remote power,
weather transducers and the 831-INT
• I/O connector for communicating with peripheral
devices such as weather transducers
• Multiple language support: English, French, Italian,
German, Spanish and Russian
• Field-upgradeable firmware
Basic Measurements
• SPL, Leq, Lmax, Lmin, Lpeak, Lpeak(max)
• 2 RMS event counters and 3 Peak event counters
•L
Nstatistics: computed to 0.01% with 0.1 dB
accuracy over the range L0.01 through L99.99, with
display of six on the meter, and Histogram tables
Basic Operation
• Status Bar and About display
• Auto-Store with Auto-Reset
• Run Timer and Stop-When-Stable Control
• Back-erase
• Markers to annotate portions of time histories
• Real-time clock
• Start time, elapsed time and paused time
• Time stamping for Lmax, Lmin, Lpeak(max) metrics
• Session Log
• Lock functions
• Calibration with calibration history and list of
calibrators
• Power management
• Status bar and About display
• Names Setup files and Setup Manager

Model 831 Manual Available Options 1-3
• Data files and Data Explorer
• Automatic data backup to prevent data loss on power
failure
• Overall measurement
• Community Noise Measurement
• Voice Annotation
•GPSData
Available Options
The Model 831 is delivered with all firmware options
available at the time of manufacture already installed.
However, only those options which have been purchased
have been enabled. Any of the other firmware options can be
enabled at a later date, following purchase, using a file
delivered from Larson Davis via the Internet.
Purchase Required Options
• Real-time 1/1 & 1/3 Octave Frequency Analysis
(831-OB3)
• Measurement History for the manual or timed
storage of statistical data (831-ELA)
• Automatic Data Logging with periods from 20 ms to
24 hour (831-LOG)
• Fast Spectral Time History Data Logging with
intervals of 2.5, 5.0 or 10 ms (831-FST, requires 831-
LOG and 831-OB3)
• Exceedance-based Logging Analysis with Events
(831-ELA). Automatic sound recordings can also be
made when the 831-SR option is also enabled
• Industrial Hygiene Measurement (831-IH)
• Sound Recording (831-SR)
• Advanced IP Communication for Cellular
connectivity (831-COMM)
• RT60 (831-RT): Instrument mode for measuring
reverberation time
• FFT (831-FFT): FFT Instrument mode

1-4 Standard Accessories Model 831 Manual
No Charge Options
The following options are available at no additional charge:
• Weather Data: Wind Speed and Direction,
Temperature, Humidity (831-WTHR)
• Analog Modem or RS-232 Communication
(831-MDM)
Standard Accessories
Some of these options may not be
provided with systems designed for
specific applications.
The Model 831 is generally delivered with the standard
accessories described below.
Microphone Preamplifier
• PRM831 (16 to 140 dB measurement range)
• PRM2103 (16 to 140 dB measurement range)
Microphone
• 377B02 1/2” free-field pre-polarized microphone,
50 mV/Pa, providing performance conforming to
Class 1 sound level meter standards
or
• 377C20 1/2” random incidence pre-polarized
microphone, 50 mV/Pa, providing performance
conforming to Class 1 sound level meter standards
Software CD
• G4 LD Utility Software for setup, measurement,
download, and data viewing through CBL138 USB,
TCP/IP, serial, or analog modem connections
• SLM Utility-G3 software for setup, control and high
speed data download, for which a CBL138 USB cable
is required to utilize the software
Accessory Kit
Included with purchase of 831-FF or
831-RI; not included when Model
831 is purchased without
microphone and preamplifier.
831-ACC including:
• 831-CCS Hard Shell Case
• PSA029 Universal AC Power Adaptor, providing
power from PC via USB port
• CBL138 USB to mini-B cable, 1.8 m

Model 831 Manual Optional Accessories 1-5
• WS001 3 1/2” Windscreen
• 4 Rechargeable AA NiMH batteries
Other
• Lanyard
Optional Accessories
Microphones
• 1/2” free-field pre-polarized microphone, 50 mV/Pa
• 1/2” random incidence pre-polarized microphone,
50 mV/Pa
• 1/4” free-field pre-polarized microphone, 4 mV/Pa,
for higher level and/or higher frequency
measurements (ADP043 adaptor required)
• 1/4” pressure pre-polarized microphone, 1.6 mV/Pa,
for higher level and/or higher frequency
measurements (ADP043 adaptor required)
Microphone Preamplifiers
• 1/2” ICP Low Noise Microphone Preamplifier
(requires adaptorADP074)
• PRM2103 Outdoor Microphone Preamplifier
• PRM426A12 Outdoor Microphone Preamplifier
• 426A12-NPT Coupler, 1.5”X27”ISO228-1 to NPT
thread
Environmental Protection
• EPS2116 Environmental Shell, protects microphone
and preamplifier from rain and wind with mounting
options for pipes, poles, and most tripods
• EPS2106-2 Environmental Shell, protects
microphone and preamplifier from rain and wind
and used with tripod TRP003
• EPS2108-2 Environmental Shell, protects
microphone and preamplifier from rain and wind
and used with tripod TRP002
• EPS029-831 Weather-proof enclosure for remote
noise monitoring; includes two batteries and
microphone mast

1-6 Optional Accessories Model 831 Manual
• EPS030-831 Weather-proof enclosure for remote
noise monitoring; includes battery
• EPS031 Pole mount weather proof fiberglass
enclosure for AC power and mounting to TRO019-
XX and TRP020-XX series tripods; includes
enclosure, internal brackets and 9-AH backup
battery
• EPS032 Pole mount weather proof fiberglass
enclosure for solar power and mounting to TRP019-
XX and TRP020-XX series tripods; includes
enclosure, internal brackets and solar charger
• EPS033 Steel security band for NMS systems
• NMS016 Permanent noise monitoring system with
weather proof enclosure and tilt down pole designed
forAC power; includes Model 831, EPS031, 831-INT,
17' pole, 426A12, 9-AH backup battery and fiberglass
enclosure
• NMS017 Permanent noise monitoring system with
weather proof enclosure and tilt down pole designed
for solar power.; includes Model 831, EPS032, 831-
INT, 17’ pole, 425A12, solar charger and fiberglass
enclosure, with the following optional solar
accessories available:
•PSA012-80 80W SOLAR PANEL
•PSA012-50 50W SOLAR PANEL
•BAT012 100AH BATTERY
• NMS018 Portable Noise monitoring system with
weather proof enclosure and tripod designed for AC
power; includes Model 831, EPS031, 831-INT, heavy
duty tripod (10’, 15’ and 20’ configurable heights),
426A12, 9-AH back up battery and fiberglass
enclosure
• NMS019 Permanent noise monitoring system with
weather proof enclosure and tripod system designed
for solar power; includes Model 831, EPS032, 831-
INT, heavy duty tripod (10’, 15’ and 20’ configurable
heights), 426A12, solar charger and fiberglass
enclosure, with the following optional solar
accessories available:
•PSA012-80 80W Solar Panel
•PSA012-50 50W Solar Panel

Model 831 Manual Optional Accessories 1-7
•BAT012 100AH Battery
•BAT013 2X21AH batteries
Weather Data Acquisition
• 831-INT 831 Interface Unit for use with 426A12
Outdoor Microphone Preamplifier and weather
sensors
The SEN028, SEN029, and SEN030
are no longer supported. • SEN028 Wind Monitor; Speed and Direction
• SEN029 Anemometer; Speed and Direction
(Low Cost)
• SEN030 Sensor; Temperature and Humidity
• SEN031 Sensor; Weather Station
Communication DVX008A
• MDMUSB-A Modem V.90 Dial-up with USB
Interface
• MDMUSB-E Modem Edge USB Wireless Quad-Band
GSM
• DVX008A USB to RS232, 9 Pin Adaptor
• CBL117 Serial Null Modem Cable, Connects
DVX008A to PC Serial Port
• 831-INT-ET 831-INT with integrated Ethernet
capability
GPS
• GPS001 GPS Receiver, USB Magnetic Mount
Equivalent Electrical Impedance Adaptor
An equivalent electrical impedance adapter can be used in
place of the microphone when very high impedance
measurements need to be made and the instrument is being
tested electrically. The adapter is simply a series capacitor
with the same capacitance as the microphone it is replacing.
The following adapters will be available for sale. If square
wave pulse measurement is to be performed, then the
adapter must also be used with a 100 kHz, low pass, T filter.
• ADP002 6.8pF BNC Input Adaptor for 1/4 in., 7pF
microphone equivalent
• ADP090 12pF BNC Input Adaptor for 1/2 in., 12pF
microphone equivalent
• ADP092 BNC In-Line Low Pass Filter 75kHz

1-8 Optional Accessories Model 831 Manual
Cables
Direct Input Cable or Adaptor
• Microphone Extension Cable: EXCXXX (shielded),
where XXX is the length in feet (XXX = 010, 020, 050,
100 and 200 available)
• CBL138 USB Cable
• CBL139AC/DC Output Cable
Cables for Environmental Monitoring
• CBL152 Cable; 426A12 to 831 Signal, 20’
• CBL153 Cable; 426A12 to 831-INT Control, 20’
• CBL154 Cable; 426A12 to Model 831 Control, 20’
• CBL144 Cable; PRM2100 to 831 Signal, 20’
• CBL145 Cable; PRM2100 to 831 Control, 20’
• CBL146 Cable; PRM2100 to 831-INT Control, 20’
• CBL203 Cable; PRM2103 to 831Control, 20’
• CBL208 Cable; PRM2103 to 831-INT Control, 20’
Cable for use with PSA027 Universal Input Power
Supply AC Power Adaptor
• CBL140 Cable; 831 Power, 2.5 mm JACK, 1’
Power Supply
• PSA027 Universal 90-240 AC Power Adaptor
providing power from electrical outlet, used to power
the Model 831 in conjunction with CBL140, CBL145
or CBL154. 1.25A, 2.5X5.5X14 mm
• BAT015 External battery powering device for the
831, holding 4 or 8 D-sized alkaline 1.5 volt batteries
to extend run time

Model 831 Manual Optional Accessories 1-9
Tripods
• TRP001 Instrument/Camera Tripod with ADP032
1/2 in. microphone clip and used with EPS2108-2
• TRP002 Microphone Stand with Boom
• TRP003 Support Tripod, heavy duty, can be used
with EPS029, EPS030 and EPS2106-2
• ADP034 Mounting adapter to attach EPS2106-2 to
TRP003
• ADP091 Mounting adapter, 426A12 TO TRP003
• TRP019 Permanent 17' tilt down pole. Use with
EPS031 AND EPS032
The TRP020-06 tripod is not for use
with EPS031 AND EPS032. • TRP020-06 Heavy duty 6' tripod. Use with 426A12, EPS030-831 AND EPS029-831
• TRP020-10 Heavy duty 10' tripod. Use with 426A12,
EPS030-831, EPS029-831, EPS031 and EPS032
• TRP020-15 Heavy duty 15' tripod. Use with 426A12,
EPS030-831, EPS029-831, EPS031 and EPS032
• TRP020-20 Heavy duty 20' tripod. Use with 426A12,
EPS030-831, EPS029-831, EPS031 and EPS032
Other Hardware
• ACC003 Headset with microphone for voice
recording/playback
Calibrators
• CAL200 Class 1 Sound Level Calibrator, 94/
114 dB @ 1 kHz
• CAL250 Class 1 Sound Level Calibrator,
114 dB @ 250 Hz
Soft Case
• CCS032 pouch with belt clip

1-10 Optional Accessories Model 831 Manual
Software
• DNA (Data Navigation and Analysis) software
provides setup and remote operation of the Model
831, providing real-time data displays on a PC.
Powerful graphics routines are provided to create
custom data displays ranging from simple time
histories and frequency spectra to spectrograms (level
vs frequency vs time) and annotated data
presentations. A variety of advanced post-processing
tools can be used to extend measured data to
engineering results such as searching time history
data for user-defined events, masking or modifying
portions of measured data and recalculating Leq and
searching spectra for pure tones. DNA will take you
from measured data to a completed project, including
report generation.

Model 831 Manual First Use 2-1
CHAPTER
2First Use
This chapter outlines the steps to unpack the Model 831 and
prepare it for first use. The following topics are covered:
• Unpacking and Inspection
• Connecting the microphone and preamplifier
• Installing 4 AA batteries
• Using USB power
• Powering-up the Model 831
You will then be ready to use the Model 831 for actual
measurements.
Unpacking and Inspection
Your Model 831 has been shipped in protective packaging.
Please verify that the package contains the items listed
below. Retain the packaging for safe shipment for
calibration service. Report any damage or shortage
immediately to PCB Piezotronics, Inc. at [phone]
(toll free) or [phone].
• Model 831
• PRM831 Microphone Preamplifier
•Microphone
Included with 831-FF and 831-RI.
Not included when 831 is purchased
without preamplifier and
microphone.
• 831-ACC including
•831-CCS Hard Shell Case
•PSA029 Universal AC PowerAdaptor
•WS001 3 1/2” Windscreen
• Lanyard
• 4 - AA NiMH batteries
If you have not already done so, please record the purchase
date, the model and serial numbers for your instrument,
preamplifier and microphone in the spaces provided on the
copyright page “Record of Serial Number and Purchase
Date” on page 2-ii. You will find the instrument’s Model and
Serial numbers printed on the label on the instrument’s back
panel. The microphone model and serial numbers are