DAQ
BNC-2140 User Manual
Dynamic Signal Acquisition Signal Conditioning Accessory
BNC-2140 User Manual
April 1998 Edition
Part Number 321933A-01
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© Copyright 1998 National Instruments Corporation. All rights reserved.
Important Information
Warranty
The BNC-2140 is warranted against defects in materials and workmanship for a period of one year from the date of
shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace
equipment that proves to be defective during the warranty period. This warranty includes parts and labor.
A Return Material Authorization (RMA) number must be obtained from the factory and clearly marked on the outside
of the package before any equipment will be accepted for warranty work. National Instruments will pay the shipping costs
of returning to the owner parts which are covered by warranty.
National Instruments believes that the information in this manual is accurate. The document has been carefully reviewed
for technical accuracy. In the event that technical or typographical errors exist, National Instruments reserves the right to
make changes to subsequent editions of this document without prior notice to holders of this edition. The reader should
consult National Instruments if errors are suspected. In no event shall National Instruments be liable for any damages
arising out of or related to this document or the information contained in it.
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AND
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USTOMER
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ATIONAL
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SHALL
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. N
ATIONAL
I
NSTRUMENTS
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,
PROFITS
,
USE
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,
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provided herein does not cover damages, defects, malfunctions, or service failures caused by owner’s failure to follow
the National Instruments installation, operation, or maintenance instructions; owner’s modification of the product;
owner’s abuse, misuse, or negligent acts; and power failure or surges, fire, flood, accident, actions of third parties,
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Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical,
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Trademarks
ICP
®
is a registered trademark of PCB Piezotronics, Inc.
Product and company names listed are trademarks or trade names of their respective companies.
WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS
National Instruments products are not designed with components and testing intended to ensure a level of reliability
suitable for use in treatment and diagnosis of humans. Applications of National Instruments products involving medical
or clinical treatment can create a potential for accidental injury caused by product failure, or by errors on the part of the
user or application designer. Any use or application of National Instruments products for or involving medical or clinical
treatment must be performed by properly trained and qualified medical personnel, and all traditional medical safeguards,
equipment, and procedures that are appropriate in the particular situation to prevent serious injury or death should always
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and safety in medical or clinical treatment.
©
National Instruments Corporation v BNC-2140 User Manual
Contents
About This Manual
Organization of This Manual.........................................................................................vii
Conventions Used in This Manual.................................................................................viii
Related Documentation..................................................................................................viii
Customer Communication.............................................................................................viii
Chapter 1
Introduction
What You Need to Get Started......................................................................................1-2
Unpacking......................................................................................................................1-2
Optional Equipment.......................................................................................................1-2
Custom Cabling .............................................................................................................1-3
Chapter 2
Installation and Configuration
Installation .....................................................................................................................2-1
Device Configuration.....................................................................................................2-1
Chapter 3
Signal Connections
I/O Connectors...............................................................................................................3-1
Analog Input Signal Connections..................................................................................3-5
Analog Output Signal Connections ...............................................................................3-5
Chapter 4
Theory of Operation
Functional Overview......................................................................................................4-2
Analog Input Circuitry...................................................................................................4-3
Analog Output................................................................................................................4-4
Appendix A
Specifications
Appendix B
Customer Communication
Contents
BNC-2140 User Manual vi
©
National Instruments Corporation
Glossary
Index
Figures
Figure 2-1. Switch Settings and Signal Connections...............................................2-2
Figure 3-1. BNC-2140 External 68-Pin Analog Connector ....................................3-3
Figure 4-1. BNC-2140 Block Diagram ...................................................................4-2
Tables
Table 3-1. BNC Analog I/O Connector Signal Descriptions ..................................3-1
Table 3-2. 68-Pin Analog I/O Connector Signal Descriptions ................................3-4
©
National Instruments Corporation vii BNC-2140 User Manual
About This Manual
This manual describes the electrical and mechanical aspects of the
BNC-2140 accessory and contains information concerning its operation.
Organization of This Manual
The BNC-2140 User Manual is organized as follows:
• Chapter 1, Introduction, describes the BNC-2140 accessory, lists what
you need to get started, explains how to unpack your BNC-2140, and
describes optional equipment.
• Chapter 2, Installation and Configuration, explains how to install and
configure your BNC-2140 accessory.
• Chapter 3, Signal Connections, describes how to make input and
output signal connections to your BNC-2140.
• Chapter 4, Theory of Operation, contains a functional overview of the
BNC-2140.
• Appendix A, Specifications, lists the specifications of the BNC-2140.
• Appendix B, Customer Communication, contains forms you can use to
request help from National Instruments or to comment on our products
and manuals.
• The Glossary contains an alphabetical list and description of terms
used in this manual, including abbreviations, acronyms, metric
prefixes, mnemonics, and symbols.
• The Index contains an alphabetical list of key terms and topics in this
manual, including the page where you can find each one.
About This Manual
BNC-2140 User Manual viii
©
National Instruments Corporation
Conventions Used in This Manual
The following conventions are used in this manual:
<> Angle brackets containing numbers separated by an ellipsis represent a
range of values associated with a bit or signal name—for example,
DIO<3..0>.
This icon to the left of bold italicized text denotes a note, which alerts you
to important information.
This icon to the left of bold italicized text denotes a caution, which advises
you of precautions to take to avoid injury, data loss, or a system crash.
bold italic Bold italic text denotes a note or caution.
italic Italic text denotes a variable, emphasis, a cross reference, or an introduction
to a key concept.
SE SE means referenced single ended (RSE).
Related Documentation
The following documents contain information you may find helpful:
• National Instruments Application Note 025, Field Wiring and Noise
Considerations for Analog Signals
• PCI-4451/4452 User Manual
• NI 4551/4552 User Manual
Customer Communication
National Instruments wants to receive your comments on our products
and manuals. We are interested in the applications you develop with our
products, and we want to help if you have problems with them. To make it
easy for you to contact us, this manual contains comment and configuration
forms for you to complete. These forms are in Appendix B, Customer
Communication, at the end of this manual.
!
©
National Instruments Corporation 1-1 BNC-2140 User Manual
1
Introduction
This chapter describes the BNC-2140 accessory, lists what you need to get
started, explains how to unpack your BNC-2140, and describes optional
equipment.
Thank you for buying the BNC-2140 accessory for DSA.The BNC-2140 is
a signal conditioning accessory specifically designed for use with a
dynamic signal acquisition (DSA) series device. It interfaces four BNC
signal inputs and two BNC signal outputs directly to National Instruments
DSA products including the PCI-4451, PCI-4452, NI 4551, and NI 4552.
The BNC-2140 connects to Integrated Circuit Piezoelectric (ICP
®
)
accelerometers and microphone preamplifiers as well as any other voltage
source whose output is less than ±42.4 V.
Each input channel consists of an independent 4 mA current source suitable
for use with ICP type accelerometers and microphone preamplifiers. You
can manually enable or disable the ICP signal conditioning on a per channel
basis. When disabled, the BNC-2140 acts as a direct voltage input. You can
manually switch each input channel and each output channel from
differential (DIFF) to single-ended (SE) mode. In SE mode, the BNC shell
tethers to a clean analog ground through a 50 Ω resistor.
The BNC-2140 receives power for the ICP signal conditioning from the
DSA plug-in board via the 68-pin high-density connector. A green LED
indicates when the ICP circuitry is powered on. When you do not require
ICP signal conditioning, you can manually turn off the power to the
circuits.
Chapter 1 Introduction
BNC-2140 User Manual 1-2
©
National Instruments Corporation
What You Need to Get Started
To set up and use your BNC-2140 device, you will need the following:
❑ BNC-2140
❑ One of the following DSA devices:
PCI-4451
PCI-4452
NI 4551
NI 4552
❑ BNC-2140 User Manual
❑ Your computer
❑ SHC68-C68-A1 analog cable
Unpacking
Your BNC-2140 is shipped in an antistatic plastic package to prevent
electrostatic damage to the device. Several components on the device can
be damaged by electrostatic discharge. To avoid such damage in handling
the device, take the following precautions:
• Ground yourself via a grounding strap or by holding a grounded object.
• Touch the plastic package to a metal part of your computer chassis
before removing the device from the package.
• Remove the device from the package and inspect the device for loose
components or any other sign of damage. Notify National Instruments
if the device appears damaged in any way. Do not install a damaged
device.
• Never touch the exposed pins of connectors.
Optional Equipment
If your application requires that you use transducers with microdot
connectors, use the BNC plug screw-on receptacle, part number
033-0101-0001, from Microdot Connector Company. This accessory
allows you to conect BNC and microdot connectors
Chapter 1 Introduction
©
National Instruments Corporation 1-3 BNC-2140 User Manual
If your application requires that you use a prepolarized microphone with a
microphone preamplifier, contact Brüel and Kjær.
Custom Cabling
National Instruments offers cables of different lengths for the BNC-2140
accessory to connect your analog I/O signals to the DSA devices. National
Instruments recommends that you not develop your own cabling solution
due to the high-density connector that is required and the necessity to
maintain high signal integrity.
If your application requires you to develop your own cable, use the
following guidelines:
• Use shielded twisted-pair wires for each differential analog input or
output channel pair. Since the signals are differential, using this type of
wire yields the best results.
• When connecting the cable shields, be sure to connect the analog input
grounds to the AIGND pins and the analog output grounds to the
AOGND pins. For a connector pinout description refer to Table 3-2 in
Chapter 3, Signal Connections.
• You can create your own accessories by using a 68-pin very high
density cable interconnect (VHDCI) receptacle header using AMP
68-position right-angle PWB receptacle header 787254-1.
• Recommended manufacturer part numbers for the 68-pin mating
connector (for the cable assembly) are as follows:
– AMP 68-position cable straight plug, part number 787131-3
– AMP 68-position backshell with jackscrews, part number
787191-1
©
National Instruments Corporation 2-1 BNC-2140 User Manual
2
Installation and Configuration
This chapter explains how to install and configure your BNC-2140
accessory.
Installation
Note
You must turn the power off to your computer before installing the BNC-2140.
The following are general installation instructions.
1. Insert either end of your SHC68-C68-A1 analog cable into the 68-pin
connector on the BNC-2140. Insert the other end into the 68-pin
connector on the DSA plug-in device.
2. Tighten the jack screws finger-tight on both ends of the cable.
3. Check the installation.
4. Turn on your computer.
The BNC-2140 accessory is now installed.
Device Configuration
You must manually configure the BNC-2140 accessory by setting the
channel switches. You can configure each input channel to have ICP signal
conditioning enabled or disabled, and for DIFF and SE measurements. You
can also configure each output channel for DIFF or SE measurements. You
can turn the power on or off for the ICP signal conditioning circuitry. If you
do not require ICP signal conditioning, turn off the ICP power. Refer to
Figure 2-1 for the location of the switches.
Note
You can connect or disconnect BNC cables carrying signals without turning off
the computer.
©
National Instruments Corporation 3-1 BNC-2140 User Manual
3
Signal Connections
This chapter describes how to connect input and output signals to your
BNC-2140.
You can connect the external analog signals through six BNC connectors.
Four BNC connectors are for input signals and two connectors are for
output signals.
The SHC68-C68-A1 shielded cable connects the BNC-2140 internal
analog signal connector to the DSA plug-in device. A single 68-pin 0.8 mm
VHDCI connector connects the analog I/O signals to the shielded cable.
I/O Connectors
Table 3-1 shows the pin assignments for the six external I/O BNC
connectors.
Table 3-1.
BNC Analog I/O Connector Signal Descriptions
Signal Name Reference Direction Description
+ACH<0..3> AIGND Input +Analog Input Channel 0 through 3—Each channel
can have ICP enabled or disabled. This signal passes
through the BNC internal conductor.
–ACH<0..3> AIGND Input
–Analog Input Channel 0 through 3
—
In SE mode
the inverting (–) terminal is tethered to ground
through a 50
Ω
resistor. This signal passes through
the external BNC shell.
+DAC0OUT –DAC0OUT Output +Analog Output Channel 0—This pin supplies the
analog non-inverting output channel 0. This signal
passes through the internal BNC conductor.
–DAC0OUT +DAC0OUT Output
–Analog Output Channel 0
—
This pin supplies the
analog inverting output channel 0. This signal
passes through the external BNC shell. In SE mode,
the inverting (–) terminal is tethered to ground
through a 50
Ω
resistor.
Chapter 3 Signal Connections
BNC-2140 User Manual 3-2
©
National Instruments Corporation
+DAC1OUT –DAC1OUT Output +Analog Output Channel 1—This pin supplies the
analog non-inverting output channel 1. This signal
passes through the internal BNC conductor.
–DAC1OUT +DAC1OUT Output
–Analog Output Channel 1
—
This pin supplies the
analog inverting output channel 1. This signal
passes through the external BNC shell. In SE mode,
the inverting (–) terminal is tethered to ground
through a 50
Ω
resistor.
Table 3-1. BNC Analog I/O Connector Signal Descriptions (Continued)
Signal Name Reference Direction Description
Chapter 3 Signal Connections
©
National Instruments Corporation 3-3 BNC-2140 User Manual
Figure 3-1 describes the pin connections on the BNC-2140 68-pin
connector.
Figure 3-1. BNC-2140 External 68-Pin Analog Connector
DGND
+5 V
NC
NC
NC
NC
AOGND
†
–DAC1OUT
AOGND
†
–DAC0OUT
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
AIGND
†
–ACH3
AIGND
†
–ACH2
AIGND
†
–ACH1
AIGND
†
–ACH0
DGND
NC
NC
NC
AOGND
+DAC1OUT
AOGND
+5 V
NC
+DAC0OUT
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
AIGND
+ACH3
AIGND
+ACH2
AIGND
+ACH1
AIGND
+ACH0
135
236
337
438
539
640
741
842
943
10 44
11 45
12 46
13 47
14 48
15 49
16 50
17 51
18 52
19 53
20 54
21 55
22 56
23 57
24 58
25 59
26 60
27 61
28 62
29 63
30 64
31 65
32 66
33 67
34 68
†
These AIGND and AOGND pins are not connected in the SHC6868-A1 cable
Chapter 3 Signal Connections
BNC-2140 User Manual 3-4
©
National Instruments Corporation
Note This BNC-2140 pin assignment maps to the pin assignment of the DSA device you
are connecting to the BNC-2140. Refer to your DSA device user manual for the
pin assignments specific to your device connection.
Table 3-2 shows the pin assignments for the internal 68-pin I/O connector.
Refer to Figure 3-1 for the pin assignments for the 68-pin connector.
Caution Connections that exceed any of the maximum ratings of input or output signals
on the BNC-2140 accessory can damage not only the BNC-2140, but also the DSA
plug-in device and the computer as well. Maximum input ratings for each signal
are given in Appendix A, Specifications. National Instruments is not liable for any
damages resulting from signal connections exceeding maximum ratings.
Table 3-2. 68-Pin Analog I/O Connector Signal Descriptions
Signal Name Reference Direction Description
AIGND — — Analog Input Ground—These pins are the reference
point for single-ended measurements in SE mode
and the bias current return point for differential
measurements.
+ACH<0..3> AIGND Input +Analog Input Channel 0 through 3.
–ACH<0..3> AIGND Input
–Analog Input Channel 0 through 3.
+DAC0OUT –DAC0OUT Output +Analog Output Channel 0.
–DAC0OUT +DAC0OUT Output
–Analog Output Channel 0.
+DAC1OUT –DAC1OUT Output +Analog Output Channel 1.
–DAC1OUT +DAC1OUT Output
–Analog Output Channel 1.
AOGND — — Analog Output Ground—The analog output
voltages are ultimately referenced to this node.
DGND — — Digital Ground—This pin supplies the reference for
the +5 VDC supply.
+5 V DGND Output +5 VDC Source—These pins are fused for up to
0.5 A of +5 V supply on the DSA plug-in device.
The fuse is self-resetting. This source powers the
ICP circuits of the BNC-2140.
NOTE:
For +ACH<0..3>, –ACH<0..3>, +DAC0OUT, –DAC0OUT, +DAC1OUT, and –DAC1OUT descriptions see
Table 3-1.
!
Chapter 3 Signal Connections
©
National Instruments Corporation 3-5 BNC-2140 User Manual
The outer shell of the BNC connectors is not GND (0 V). The outer shell of the
BNC is not physically connected to the metal box of the BNC-2140. The outer shell
is either the inverting differential signal in DIFF mode or is tethered to GND (0 V)
through a 50 Ω, 1 W resistor in SE mode.
Analog Input Signal Connections
The analog input signals for the BNC-2140 device are +ACH<0..3> and
–ACH<0..3>. Connecting of analog input signals to your BNC-2140
accessory depends on the configuration of the input signal sources.
For most signals, you use a DIFF configuration and simply connect the
signal to +ACHx (where x is the BNC-2140 channel) and the signal ground
(or signal minus), as appropriate, to –ACHx. If a signal has a high output
impedance (greater than 1 kΩ) and is floating, you may find it useful to use
an SE configuration that tethers the signal minus to AIGND. This reduces
common-mode interference.
Analog Output Signal Connections
The BNC-2140 analog output signals are +DAC0OUT, –DAC0OUT,
+DAC1OUT, and –DAC1OUT.
+
DAC0OUT is the voltage output signal for analog output channel 0.
+
DAC1OUT is the voltage output signal for analog output channel 1.
Connection of analog output signals from your BNC-2140 accessory
depends on the configuration of the devices receiving the signals. For most
signals, you use a DIFF configuration and simply connect +DACxOUT
(where x is the BNC-2140 channel) to the signal and –DACxOUT to the
signal ground (or signal minus), as appropriate. When driving some
floating devices, you may sometimes find it helpful to use the SE
configuration and connect the floating ground system of the device to
AOGND to reduce common-mode noise coupled from an interfering
source to the device.
Caution
When you configure an analog output channel in the SE mode, the voltage
between AOGND and –DACxOUT must not exceed ±7.07 V (5 V
rms
). Voltage that
exceeds this rating can damage the BNC-2140, the DSA plug-in device, and the
computer. National Instruments is not responsible for any damages resulting from
connections that exceed this rating.
!
Chapter 4 Theory of Operation
BNC-2140 User Manual 4-2
©
National Instruments Corporation
Functional Overview
Figure 4-1 is a block diagram of the BNC-2140.
Figure 4-1.
BNC-2140 Block Diagram
0
+5 V +30 V
ICP CH0
Isolated Power Supply
ICP Current
Source 0
ICP Enable
on/off
AICH0
BNC
Connector
DIFF/SE
50 Ω
AICH0+
AICH0–
AIGND
3
+5 V +30 V
ICP CH3
Isolated Power Supply
ICP Current
Source 3
ICP Enable
on/off
AICH3
BNC
Connector
DIFF/SE
50 Ω
AICH3+
AICH3–
AIGND
DAC0OUT
BNC
Connector
DIFF/SE
50Ω
DAC0OUT+
DAC0OUT–
AOGND
DAC1OUT
BNC
Connector
DIFF/SE
50 Ω
DAC1OUT+
DAC1OUT–
AOGND
68-Pin
Connector
+5 V
DGND
+5 V
ICP Power
on/off
Chapter 4 Theory of Operation
©
National Instruments Corporation 4-3 BNC-2140 User Manual
Analog Input Circuitry
The BNC-2140 has four identical analog input channels.
A principal function of the BNC-2140 is to supply a constant current for
ICP type accelerometers and microphone preamplifiers. Many
accelerometers use piezoelectric materials to generate a charge that is
proportional to the acceleration applied. Although these types of
accelerometers have certain advantages, they are very suseptable to
external noise. ICP-type sensor manufacturers embed a charge amplifier
within the transducer to reduce the effect of cable length, noise, and other
spurious effects. The BNC-2140 supplies the constant current required to
power that embedded charge amplyfier ICP that allows you to use
inexpensive cables such as BNC cables. Leveraging off this technology,
some manufacturers use ICP signal conditioning to power their
prepolarized microphones. If your application requires a microphone
preamplifier for use with a prepolarized microphone see Optional
Equipment, in Chapter 1, for a list of recommended suppliers.
You must enable ICP to generate the required power for each channel that
uses these types of accelerometers and microphone preamplifiers. When
you disable ICP, the connection from the ICP circuit to the analog input
signal breaks and has no impact on the incoming signal. When you disable
ICP on an input channel, the circuitry of two channels is still energized. If
you do not require ICP to be enabled on any of the four input channels, turn
off the ICP power to de-energize the circuitry. Turning off the ICP power
removes any noise the circuitry can induce on the incoming signal.
You can also use the BNC-2140 to select between DIFF and SE input
modes. The BNC-2140 works with any DSA device that has a differential
input stage for each input channel.
In DIFF mode, one line connects to the positive input of the channel, and
the other connects to the negative input of that same channel. You can
connect the differential input to either floating or ground-referenced
signals.
You can use ICP signal conditioning when the BNC-2140 inputs are either
in DIFF or SE mode.
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