GRAS 12BA User manual

Instruction Manual
GRAS 12BA 1-Channel CCP Power Module with TEDS Support
GRAS 12BE 2-Channel CCP Power Module with TEDS Support
GRAS 12BB 4-Channel CCP Power Module with TEDS Support
GRAS 12BC 1-Channel LEMO Power Module with TEDS Support
GRAS 12BF 2-Channel LEMO Power Module with TEDS Support
GRAS 12BD 4-Channel LEMO Power Module with TEDS Support
LI0280 – 19 January 2022

12Bx Power Modules
Instruction Manual
Copyright Notice
©2021 - 2022 GRASSound & Vibration A/S
grasacoustics.com
Any technical documentation that ismadeavailable byGRAS is the
copyrighted work ofGRAS and is owned by GRAS.
The content in this document is subject to changewithout notice. GRAS
Sound & Vibration is not liable orresponsible for any errors or inaccuracies
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Trademarks
Any product names mentioned inthis document may be trademarks or
registered trademarks of their respective companies and are hereby
acknowledged.
8211.0373.001
XII01191861
January 2022
Any feedback or questions concerning this document are welcome at
[e-mail]
Revision Date Description
1 22 January 2021 First Edition
2 19 January 2022 Additional power modules added (Second Edition)

Table of Contents
1 | Introduction - - - - - - - - - - - - - - - - - - - - - - - - -3
1.1 CCP Power Modules - - - - - - - - - - - - - - - - - - - - - 3
1.2 Traditional Power Modules - - - - - - - - - - - - - - - - - 4
2 | External Features - - - - - - - - - - - - - - - - - - - - - 5
2.1 CCP Preamplifier Support - - - - - - - - - - - - - - - - - - 7
2.2 Input/Output - - - - - - - - - - - - - - - - - - - - - - - 8
3|Operation - - - - - - - - - - - - - - - - - - - - - - - - - 9
3.1 Channel Indicators and Assignment - - - - - - - - - - - - - 9
3.2 TEDS Support - - - - - - - - - - - - - - - - - - - - - - - 9
3.3 SysCheck2 Support - - - - - - - - - - - - - - - - - - - - 10
3.4 Input/Output Functions - - - - - - - - - - - - - - - - - - 10
3.5 Connection and Configuration - - - - - - - - - - - - - - - 11
4 | Accessing TEDS Data - - - - - - - - - - - - - - - - - - - 13
4.1 Setting up for TEDS Data - - - - - - - - - - - - - - - - - - 13
5 | Accessing SysCheck2 - - - - - - - - - - - - - - - - - - 21
5.1 SysCheck2 commands using the Mic Power Module App - - - 21
5.2 Using SysCheck2 with APx500 Software - - - - - - - - - - 26
A | LEMO Microphone Power Supply Specifications - - - - 27
A.1 USB Interface - - - - - - - - - - - - - - - - - - - - - - - 27
A.2 External Power - - - - - - - - - - - - - - - - - - - - - - 27
A.3 Microphone Channel - - - - - - - - - - - - - - - - - - - - 28
A.4 General/Environmental - - - - - - - - - - - - - - - - - - - 29
B | CCP Microphone Power Supply Specifications - - - - 31
B.1 USB Interface - - - - - - - - - - - - - - - - - - - - - - - 31
B.2 Microphone Channel - - - - - - - - - - - - - - - - - - - - 31
B.3 General/Environmental - - - - - - - - - - - - - - - - - - - 33
C | Safety - - - - - - - - - - - - - - - - - - - - - - - - - - - 35
C.1 Safety Information - - - - - - - - - - - - - - - - - - - - - 35
C.2 Consignes de sécurité - - - - - - - - - - - - - - - - - - - 38

C.3 Información de seguridad - - - - - - - - - - - - - - - - - 40
D | Warranty, Service and Repair - - - - - - - - - - - - - 43
D.1 Warranty - - - - - - - - - - - - - - - - - - - - - - - - - 43
D.2 Service and Repairs - - - - - - - - - - - - - - - - - - - - 43
Index - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45

3
1 | Introduction
The GRAS 12Bx family of power modules provide traditional power
for non-polarized transducers and preamplifiers (with LEMO con-
nectors) or constant current power (CCP) polarized transducers
and preamplifiers (with BNC connectors). Modules are available
with one, two, or four channels. The configurations are:
• GRAS 12BA (1-Channel CCP Power Module)
• GRAS 12BC (1-Channel LEMO Power Module)
• GRAS 12BE (2-Channel CCP Power Module)
• GRAS 12BF (2-Channel LEMO Power Module)
• GRAS 12BB (4-Channel CCP Power Module)
• GRAS 12BD (4-Channel LEMO Power Module)
When used in conjunction with the GRAS Mic Power Module App or
an Audio Precision APx analyzer instrument (available separately)
and a connected personal computer (PC), the modules can provide
access to Transducer Electronic Data Sheet (TEDS) data on TEDS-
enabled microphones. Additionally, when a SysCheck2™ -enabled
CCP microphone is used, you can remotely verify that the micro-
phone is functioning within referenced parameters.
1.1 CCP Power Modules
The GRAS CCP Power Modules with TEDS Support (12BA, 12BB and
12BE) are SysCheck2-enabled USB-powered pass-through power
modules that provide power to microphones without signal degra-
dation, gain modification, or attenuation. Power is provided for CCP
transducers and preamplifiers (also known as ICP®transducers
and preamplifiers) through BNC connections. The 12BA supports a
single CCP microphone preamplifier, the 12BE supports up to two
and the 12BB supports up to four CCP microphone preamplifiers. If
more than four microphones are required, multiple power modules
can be used concurrently. Power is provided through the USB cable
using a USB 2.0 or USB 3.0 port on the PC and a USB-C port on the
power module.

4 | 12Bx Power Modules Instruction Manual
Examples of GRAS products requiring a CCP supply are:
•246AE½″Free-field SysCheck2 Microphone Set.
•46BD½″CCP Pressure Microphone Set.
•46AE½″Free-field Microphone Set.
•40PHArrayMicrophones.
1.2 Traditional Power Modules
The GRAS LEMO Power Modules (12BC, 12BD and 12BF) are DC-
powered pass-through power modules that provide power to
microphones without signal degradation, gain modification, or
attenuation. Power is provided through the USB C port when con-
nected to a port that can supply the minimum 1.5 A required by the
module. AC mains power can also be supplied through the AUX
PWR port if the minimum 1.5 A is not available through the USB-C
port. When USB power is not sufficient and AUX PWR is not con-
nected, the channel 1 LCD display will flash with two dash (--)
characters.
Examples of GRAS products with a LEMO connection are:
•46BH½″LEMO Pressure Microphone Set.
•46AF½″LEMO Free-Field Microphone Set.

5
2 | External Features
Figure 1 — LEMO and CCP power module features
LED Displays
There is an LED display for each microphone input on the module.
There are up to four LED displays on the power module, depending
on the model. Each LED display identifies a microphone input so an

6 | 12Bx Power Modules Instruction Manual
appropriate microphone can be selected for TEDS data acquisition.
Numbers are only displayed on the LED displays when using the
GRAS Mic Power Module App or Audio Precision APx500 software.
Microphone Inputs
There are up to four microphone inputs on a power module,
depending on the model. Power modules that use standard power
come with LEMO connectors for the inputs. Power modules using
CCP come with BNC connectors for the inputs. The corresponding
output connectors are on the rear panels.
Power Module Outputs
There are up to four output connectors on a power module,
depending on the model. BNC connectors are used for all outputs.
Ground Lug
For Operator Safety when using power modules equipped with 7-
Pin LEMO Microphone input connectors, the ground terminal
marked with the Protective Earth Terminal symbol must be
connected with a low-resistance ground strap to a suitable ground.
See Protective Earth Terminal on page 36 for more information.
For CCP power modules, performance may be improved by con-
necting the ground lug of the power module and the APx analyzer
or other measurement equipment using a low-resistance ground
strap.
PC / Power Interface USB-C Port
The 12BA, 12BB and 12BE are powered through the USB-C port on
the rear panel of the module when connected to a USB 2.0 or USB
3.0 port and draw a maximum of 500 mA. Since the modules do not
affect gain or attenuation, there are no external switches or con-
trols. The USB-C port also serves as the data connection to the PC
when using with the GRAS Mic Power Module App or APx500 soft-
ware. USB 2.0 and USB 3.0 connections are supported.