Larson Davis PRM2103 User manual

Model PRM2103
Outdoor Microphone
Preamplifier

I2103.01 Rev C
Larson Davis
PRM2103
Preamplifier
Reference Manual

PRM2103 Reference Manual i-2
Copyright
Copyright 2017 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.
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E-mail: [email protected]om

PRM2103 Reference Manual ii-1
Table of Contents
Module 1 Overview 1-1
1.1 Description ...........................................................................................................................................................1-1
1.2 Features ................................................................................................................................................................1-3
1.3 Supplied Accessories .........................................................................................................................................1-3
Module 2 Getting Started 2-1
2.1 Overview ...............................................................................................................................................................2-1
2.2 Environmental Protection Systems ................................................................................................................2-1
2.3 Wiring ....................................................................................................................................................................2-2
2.4 EPS Installation ...................................................................................................................................................2-4
2.5 Verifying Preamp Operation .............................................................................................................................2-5
2.6 Setting PRM2103-FF Corrections .....................................................................................................................2-6
Module 3 Operation 3-1
3.1 Overview ...............................................................................................................................................................3-1
3.2 Performing the Acoustic Calibration ..............................................................................................................3-1
3.3 PRM2103 Heater Controls .................................................................................................................................3-3
3.4 Performing Calibration Checks ..................................................................................................................... 3-10
3.5 Upgrading the PRM2103 Firmware .............................................................................................................. 3-16
Appendix A Technical Specifications A-1
A.1 Overview .............................................................................................................................................................. A-1
A.2 Standards Met by PRM2103 ............................................................................................................................. A-1
A.3 Electrical .............................................................................................................................................................. A-2
A.4 Physical ................................................................................................................................................................ A-5
A.5 PRM2103 Corrections ........................................................................................................................................ A-9
A.6 Acoustical Response ....................................................................................................................................... A-12
A.7 Cables ................................................................................................................................................................. A-43
A.8 CE Declaration of Conformity ........................................................................................................................ A-45
Appendix B Legacy Operation B-1
B.1 Overview .............................................................................................................................................................. B-1
B.2 Performing the Acoustic Calibration ............................................................................................................. B-1
B.3 PRM2103-FF Heater Controls .......................................................................................................................... B-2
B.4 Performing Calibration Checks ....................................................................................................................... B-8
B.5 Upgrading Firmware with SLM Utility-G3 ....................................................................................................B-15

PRM2103 Reference Manual Description 1-1
Module 1Overview
1.1 Description ............................................................................................................................................ 1-1
1.1.1 Application ............................................................................................................................ 1-2
1.2 Features ................................................................................................................................................. 1-3
1.3 Supplied Accessories .......................................................................................................................... 1-3
1.3.1 Other Accessories ................................................................................................................ 1-3
1.1 Description
TAKE NOTE Use connected
sound level meter microphone
corrections with the PRM2103-
FF.
The Larson Davis PRM2103 Outdoor Microphone Preamplifier has been
designed for use with EPS2116, EPS2106-3, and EPS2108-3 Environmental
Protection Shrouds and model 831 sound level meters (SoundAdvisor
Model 831C and Model 831). It includes remotely-activated, multi-
frequency calibration check functionality and desiccant-free automatic
heaters for internal humidity control. The PRM2103 requires only one
microphone to get free-field, random, or 90 degree response.
FIGURE 1-1 PRM2103-FF Outdoor Microphone Preamplifier
FIGURE 1-2 Outdoor Microphone System as part of an EPS2116
Bird Spike
Windscreen
Base
Tripod Adaptor

PRM2103 Reference Manual Description 1-2
With the supplied 377B02 microphone, the PRM2103-FF provides
frequency response characteristics consistent with precision sound level
meter requirements for free-field measurements when used with Larson
Davis sound level meters.
1.1.1 Application
The PRM2103-FF is an integral component of an outdoor noise
monitoring system, like the SoundAdvisor NMS044 noise monitoring
system.
FIGURE 1-3 Remote Noise Monitoring System (SoundAdvisor NMS044)
EPS2116 with
PRM2103-FF
CBL222-08 cable
Pole
SoundAdvisor Model
831C Sound Level
Meter
Solar panel

PRM2103 Reference Manual Features 1-3
1.2 Features
The Larson Davis PRM2103-FF Outdoor Microphone Preamplifier provides
the following features:
• Permanent outdoor noise monitoring for IEC 61672 Class 1 mea-
surements (with 377B02 microphone and EPS2116, EPS2106-3 or
EPS2108-3). Group Z compliant
• For use with Larson Davis EPS2116, EPS2106-3 or EPS2108-3 envi-
ronmental protection shroud and Model 831 and SoundAdvisor
Model 831C sound level meters
• Automatic calibration check at five frequencies, including 31.5,
250, 1000, 4000, and 8000 Hz
• Internal humidity and temperature sensor for automatic micro-
phone humidity control
• Free-field, random or 90 degree response with single 377B02
microphone using digital correction in the Model 831 sound level
meter
• 50mV/Pa microphone sensitivity for 16 dB to 140 dB typical range
• Protection from rain, wind, and birds when used with EPS2116,
EPS2106-3, or EPS2108-3 environmental protection shroud
• Single cable connectivity
• On-screen device monitoring for connection with the Model 831
and SoundAdvisor Model 831C sound level meters
• Stainless steel construction
1.3 Supplied Accessories
• Prepolarized 377B02 1/2” free-field microphone
• Manual on CD
1.3.1 Other Accessories
Sound Level Meter • SoundAdvisor Model 831C Sound Level Meter
• Model 831 Sound Level Meter
Environment Protection • EPS2116 Outdoor Microphone and Preamplifier Protection,
including rain, wind, and bird protection
• EPS2106-3 or EPS2108-3 Environment Protection Shroud, includ-
ing rain, wind, and bird protection
Power Supplies PSA027 DC Power Supply
• Input: 100 to 240 Vac; 47-63 Hz

PRM2103 Reference Manual Supplied Accessories 1-4
• Output: 12 Vdc, 1.6 A
• 2.5 x 5.5 mm barrel connector
Cables Used with Model 831-INT or 831-INT-ET
• CBL208-20
• CBL208-XX
Used with Model 831 or SoundAdvisor Model 831C
• CBL203-20
• CBL203-XX
• CBL222-XX
Calibrators CAL200 Class 1 Sound Level Calibrator, 94/114 dB @ 1 kHz
CAL250 Class 1 Sound Level Calibrator, 114 dB @ 250 Hz
Software G4 LD Utility
SLM LD Utility-G3

PRM2103 Reference Manual Overview 2-1
Module 2Getting Started
2.1 Overview
2.1 Overview ................................................................................................................................................ 2-1
2.2 Environmental Protection Systems ................................................................................................. 2-1
2.3 Wiring ...................................................................................................................................................... 2-2
2.4 EPS Installation .................................................................................................................................... 2-4
2.5 Verifying Preamp Operation .............................................................................................................. 2-5
2.5.1 With Model 831 ..................................................................................................................... 2-5
2.5.2 With SoundAdvisor Model831C ........................................................................................ 2-5
2.6 Setting PRM2103-FF Corrections ...................................................................................................... 2-6
This module describes the mounting and setup of the PRM2103-FF
preamplifier, wiring with supported instruments, and basic operation.
2.2 Environmental Protection Systems
LEARN MORE For basic
mounting steps for the
EPS2116, see 2.4 "EPS
Installation" on page 2-4.
The PRM2103-FF is designed to be mounted on three Larson Davis
products for outdoor noise monitoring. To learn more about these
environmental protection systems and their mounting procedures, see
the following reference manuals:
• Larson Davis EPS2116 Outdoor Microphone and Preamplifier Pro-
tection Manual
• Larson Davis EPS2106 Environmental Shroud Technical Reference
Manual
• Larson Davis EPS2108 Environmental Shroud Technical Reference
Manual

PRM2103 Reference Manual Wiring 2-2
2.3 Wiring
The PRM2103 uses a single cable for both signal and control functions,
but provides differing connections, depending on whether you are
connecting to the 831 sound level meters or to the 831-INT, as follows:
Sound Level Meters
The CBL203 connects the PRM2103 to Larson Davis sound level meters, as
shown in Figure 2-1.
FIGURE 2-1 Connection to 831/831C Only
SoundAdvisor NMS044 Connections
When connecting the PRM2103 to the sound level meter, the CBL222-08
cable should be routed through the cable gland on the case. For more
information, refer to the Larson Davis EPS044 & NMS044 Manual.
When connecting the PRM2103 to NMS044, follow Figure 2-2 as shown
below.
FIGURE 2-2 Connection to NMS044

PRM2103 Reference Manual Wiring 2-3
NoiseTutor Connections
When connecting the PRM2103 to the NoiseTutor System, the CBL203
cable should be routed through the cable gland on the NoiseTutor case.
For more information, refer to the Larson Davis NoiseTutor System
Manual.
When connecting the PRM2103 to a NoiseTutor, follow Figure 2-3 as
shown below.
FIGURE 2-3 Connection to NoiseTutor
INT-ET Connections
The CBL208 connects the PRM2103 to the 831-INT or 831-INT-ET, as shown
in Figure 2-4.
FIGURE 2-4 Connection to 831-INT or 831-INT ET

PRM2103 Reference Manual EPS Installation 2-4
2.4 EPS Installation
The CBL203, CBL208, and CBL222 provide 10-pin connections between
the PRM2103 and their connecting devices. To connect the PRM2103 and
cable, follow these steps:
Step 1 Assemble the microphone on top of the PRM2103
preamplifier. If needed, install an o-ring on the bottom
thread of the preamplifier, see Figure 2-5.
FIGURE 2-5 Microphone Install
Step 2 Thread the cable up through the EPS with the cable out the
top, so it rotates freely.
Step 3 Align the red dots on the PRM2103 and cable, then connect
by pushing gently together. The whole assembly should be
out and above the EPS.
Step 4 Push the preamplifier into the EPS until the microphone is
seated on top.
FIGURE 2-6 EPS Installation
O-ring location
Microphone will
be visible on top

PRM2103 Reference Manual Verifying Preamp Operation 2-5
2.5 Verifying Preamp Operation
2.5.1 With Model 831
TAKE NOTE Model 831 firmware
version 2.204 or newer is
required to support the
PRM2103-FF.
When the PRM2103-FF is connected to the Model 831 sound level meter, a
message appears, verifying that the connection has been established, as
shown in FIGURE 2-6.
FIGURE 2-7 PRM2103-FF Connection Message
2.5.2 With SoundAdvisor Model831C
When the PRM2103 is connected to the SoundAdvisor Model 831C sound
level meter, a message appears, verifying that the connection has been
established, as shown in Figure 2-8.
FIGURE 2-8 PRM2103-FF Connection Message

PRM2103 Reference Manual Setting PRM2103-FF Corrections 2-6
2.6 Setting PRM2103-FF Corrections
TAKE NOTE It is important to
select the proper correction.
Failure to do this will result in a
measurement that is not IEC
61672-1 Class 1 compliant.
The model 831 sound level meters provide corrections for the PRM2103-
FF with EPS2116, EPS2106-3, or EPS2108-3 to produce a response that
complies with the requirements of IEC 61672-1. These correction filters
correct for the effects of the 377B02 microphone response and protection
system. The selected correction is displayed on the meter whenever the
preamplifier is connected or disconnected, as shown in FIGURE 2-6.
There are microphone corrections available in the SoundAdvisor and
Model 831 to be applied the PRM2103, and three are applicable to the
PRM2103-FF, as follows:
FF:RI 2116 and FF:RI 2106/8
Provides random incidence response.
FF:FF 2116 and FF:FF 2106/8
Provides corrected free-field response. This is usually selected when
aiming the microphone for 0° measurements.
FF:90 2116 and FF:90 2106/8
Provides 90° response. This is usually selected when microphone
placement is on a vertical pole but 90° measurements are needed.
To set PRM2103-FF microphone corrections, follow these steps:
TAKE NOTE When using the
PRM2103-FF with the EPS2116,
select only corrections that
include 2116 in the name.
When using the PRM2103-FF
with the EPS2106 or EPS2108,
select only corrections that
include 2106/8 in the name.
Step 1 On the SoundAdvisor or Model 831, navigate Tools System
Properties Preferences,
Step 2 Select the Mic Corr. field and then choose the needed
correction.
Figure 2-9 shows the Model 831 microphone corrections for the PRM2103-
FF. These are the same for the 831C.
FIGURE 2-9 PRM2103-FF Microphone Corrections

PRM2103 Reference Manual Overview 3-1
Module 3Operation
3.1 Overview ................................................................................................................................................ 3-1
3.2 Performing the Acoustic Calibration ................................................................................................ 3-1
3.3 PRM2103 Heater Controls .................................................................................................................. 3-3
3.3.1 Manual Mode ........................................................................................................................ 3-3
3.3.2 Automatic Mode .................................................................................................................. 3-3
3.3.3 Heater Controls on SoundAdvisor ................................................................................... 3-4
3.3.4 Heater Controls in G4 LD Utility Software ....................................................................... 3-4
3.3.5 Viewing PRM2103 Data ....................................................................................................... 3-6
3.3.6 Data on the SoundAdvisor ................................................................................................. 3-6
3.3.7 Data in G4 LD Utility Software ........................................................................................... 3-9
3.4 Performing Calibration Checks .......................................................................................................3-10
3.4.1 Manual Calibration Checks ..............................................................................................3-10
3.4.2 Automatic Calibration Checks ........................................................................................3-11
3.4.3 Calibration Check History on the SoundAdvisor .........................................................3-12
3.4.4 Manual Calibration Checks in G4 LD Utility ..................................................................3-13
3.4.5 Automatic Calibration Checks in G4 LD Utility ............................................................ 3-14
3.4.6 Calibration Check History inG4 LD Utility .....................................................................3-15
3.5 Upgrading the PRM2103 Firmware .................................................................................................3-16
3.1 Overview
This module provides information for specifying PRM2103 heater controls,
viewing data, performing calibration checks, and upgrading firmware
through the SoundAdvisor Model 831C and G4 LD Utility.
3.2 Performing the Acoustic Calibration
To perform an acoustic calibration, follow these steps:
Step 1 Remove the birdspike and windscreen if the EPS2116
environmental protection system is installed.
CAUTION Do not remove the
microphone or the
microphone grid cap.
Step 2 Place the calibrator, like the CAL250 or CAL200, over the
microphone. Apply the calibrator slowly to avoid applying a
sudden large pressure change to the diaphragm.

PRM2103 Reference Manual Performing the Acoustic Calibration 3-2
Step 3 To activate the Calibration function on the sound level
meter, navigate 3(TOOLS) Calibrate.
FIGURE 3-1 Calibration
Step 4 Select a calibrator from the list or enter new information
about a calibrator.
Step 5 Turn on the calibrator. Select Do Calibration.
FIGURE 3-2 Calibrating Message
Step 6 When the calibration is completed, another message box
appears that shows the amount of change being made to
the calibration. To accept the calibration, select Yes. To
reject this calibration, select No.
Step 7 After performing this acoustical calibration, perform a
calibration check, see “Performing Calibration Checks” on
page 3-10.

PRM2103 Reference Manual PRM2103 Heater Controls 3-3
3.3 PRM2103 Heater Controls
The PRM2103 includes a heater to provide protection from condensation
to the microphone. The heater state can be specified for one of four
settings: Off, Low, High, or Auto. The default setting is Auto, which is
recommended for most applications.
3.3.1 Manual Mode
• Off: The heater remains off in all conditions.
• Low: The heater remains on continuously at low power.
• High: The heater remains on continuously at high power.
3.3.2 Automatic Mode
The Auto mode alternates between three states automatically, according
to the PRM2103 internal temperature and internal relative humidity. The
states are as follows:
Off: The heater remains off.
Low: The heater turns on at low power when the PRM2103 internal
relative humidity exceeds 65% or internal temperature drops below 5°C.
The heater turns off when the relative humidity decreases below 60% or
the temperature rises above 5°C.
High: The heater turns on high when the PRM2103 internal relative
humidity exceeds 70% or when the internal temperature drops below 3°C.
When the relative humidity decreases below 65% or the internal
temperature rises above 3°C the heater switches to low.
Figure 3-3 shows the PRM2103 automatic heater states for internal
temperature and relative humidity variations.
FIGURE 3-3 PRM2103 Heater Control Settings

PRM2103 Reference Manual PRM2103 Heater Controls 3-4
3.3.3 Heater Controls on SoundAdvisor
TAKE NOTE The heater settings
are visible on the
SoundAdvisor only when the
PRM2103 is connected to the
sound level meter.
To specify the heater controls through the sound level meter, follow these
steps:
Step 1 Navigate Tools System Properties Other tab
Step 2 In the PRM2103 Heater field, select Off, Auto, Low, or High.
Figure 3-4 shows the PRM2103 heater settings on the Other tab.
FIGURE 3-4 Heater Settings on the Other Tab
3.3.4 Heater Controls in G4 LD Utility Software
To specify heater controls through G4, follow these steps:
Step 1 Open the software. Connect to the SoundAdvisor sound
level meter by selecting the Connect button and your
instrument.
FIGURE 3-5 Connect Button

PRM2103 Reference Manual PRM2103 Heater Controls 3-5
Step 2 Navigate to the Setup Manager tab and then click the Other
tab within the Instrument Settings preferences.
FIGURE 3-6 Heater Settings on System Tab in G4 LD Utility Software
Step 3 Select heater setting. Close to save.
FIGURE 3-7 G4 Heater Settings
Ensure that your meter is
selected in this dropdown
Close and
select Yes to
save changes

PRM2103 Reference Manual PRM2103 Heater Controls 3-6
3.3.5 Viewing PRM2103 Data
The PRM2103 provides the following data:
• Preamplifier model
• PRM2103 serial number
• Internal PRM2103 temperature
• Internal PRM2103 relative humidity
• Internal PRM2103 dew point
• Heater setting status
• Calibrator check function status
• Preamplifier connection status to 831 sound level meter
• PRM2103 firmware version
3.3.6 Data on the SoundAdvisor
TAKE NOTE The sound level
meter receives temperature
and humidity updates from the
PRM2103 approximately every
fifteen seconds.
The Preamp page, or the next-to-last page on the Live tab, always displays
PRM2103 data when the PRM2103 is connected to the meter.
Temperature, humidity, and dew point is updated every 15 seconds.
Figure 3-8 shows the Preamp page on the Live tab.
FIGURE 3-8 Live tab: PRM2103 Page
If the Preamp page displays a <Comm Error> message, the SoundAdvisor
and PRM2103 are not communicating properly. Make sure the cables are
completely connected and fastened and that power is supplied to the
cable.
Preamplifier Model
PRM2103 Serial
Number
Temperature
Relative Humidity
Heater Setting
Calibrator Setting: On
PRM2103-
Firmware
version
Preamp
DC Output
Voltage