VTI Instruments EMX-4250 User manual

EMX-4250 /EMX-4251
DCV/ACV and IEPE Input 16 / 8 Channel 204.8 kSa/s 24-bit Digitizer
EMX-4016B/ EMX-4016M
16 Channel Breakout Box w Buffer Out / w Bridge Signal Conditioning
For EMX-425x
EMX-4350
DCV/ACV and IEPE Input 4 Channel 625 kSa/s 24-bit Digitizer
EMX-4380
ACV, Charge, and IEPE Input 4 Channel 625 kSa/s 24-bit Digitizer
USER’S MANUAL
P/N: 82-0142-100
Released Sep 26, 2017
VTI Instruments Corp.
2031 Main Street
Irvine, CA 92614-6509
[phone]

VTI Instruments Corp.
2 Preface
TABLE OF CONTENTS
TABLE OF CONTENTS................................................................................................................................................2
Certification..........................................................................................................................................................5
Warranty...............................................................................................................................................................5
Limitation of Warranty.........................................................................................................................................5
Trademarks...........................................................................................................................................................5
Restricted Rights Legend......................................................................................................................................5
DECLARATION OF CONFORMITY...............................................................................................................................8
GENERAL SAFETY INSTRUCTIONS.............................................................................................................................9
Terms and Symbols ..............................................................................................................................................9
Warnings...............................................................................................................................................................9
SUPPORT RESOURCES .............................................................................................................................................11
SECTION 1..................................................................................................................................................................12
INTRODUCTION.......................................................................................................................................................12
Overview ............................................................................................................................................................12
Features...............................................................................................................................................................12
PREPARATION FOR USE...........................................................................................................................................14
Unpacking...........................................................................................................................................................14
Inspecting the EMX-4250/4350/4380 ................................................................................................................14
INSTALLATION........................................................................................................................................................15
Installing EMX-4250/4350/4380........................................................................................................................15
Installing EMX-4016B/EMX-4016M.................................................................................................................15
LED Status Indications:......................................................................................................................................15
Determine System Power Requirements ............................................................................................................15
Installing Driver Software ..................................................................................................................................15
STORAGE AND SHIPMENT .......................................................................................................................................16
Storing Instruments.............................................................................................................................................16
Transporting Instruments....................................................................................................................................16
SPECIFICATIONS......................................................................................................................................................17
Digitizer Specifications ......................................................................................................................................17
Trigger Input Specifications ...............................................................................................................................18
Break out box Specifications..............................................................................................................................19
Environmental Specifications.............................................................................................................................20
PHYSICAL CHARACTERISTICS .................................................................................................................................21
Physical Specifications.......................................................................................................................................21
EMX-4250/4251, EMS-4016B/ EMX-4016M Connector PIN Numbering .......................................................21
EMX-4250/4251, EMX-4016B/EMX-4016M Connector Pin Assignments......................................................22
SECTION 2..................................................................................................................................................................23
GETTING STARTED WITH THE INSTRUMENT............................................................................................................23
Introduction ........................................................................................................................................................23
System Requirements .........................................................................................................................................23
Driver Installation...............................................................................................................................................23
Building and Running Example Programs .........................................................................................................25
Web Interface .....................................................................................................................................................26
Card upgrade through Web Interface..................................................................................................................27
Connecting To Embedded Slot-0 PXIe Controller .............................................................................................28
SECTION 4..................................................................................................................................................................32
USING THE EMX-4250/4350/4380.........................................................................................................................32
Introduction ........................................................................................................................................................32
INSTRUMENT DRIVERS............................................................................................................................................33
Overview ............................................................................................................................................................33
IVI Drivers..........................................................................................................................................................33

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Preface 3
Driver for Linux OS ...........................................................................................................................................34
COMPATIBILITY......................................................................................................................................................35
Drivers, Instruments, and OS..............................................................................................................................35
Driver and Firmware Revisions..........................................................................................................................35
Driver API and Instruments................................................................................................................................35
DRIVER STRUCTURE ...............................................................................................................................................37
Measurement ......................................................................................................................................................37
Channels and Channel Groups............................................................................................................................37
Start, Arm, Trigger, and Alarm...........................................................................................................................38
Retrieving Data...................................................................................................................................................41
Reference Clock and Time Stamp ......................................................................................................................42
Self-Calibration ..................................................................................................................................................42
LXI and LAN Events..........................................................................................................................................42
IVI Class Compliant Interfaces...........................................................................................................................43
MULTIPLE CARDS,SEGMENTS,AND CHASSIS.........................................................................................................44
Initializing Driver with Multiple Cards ..............................................................................................................44
Multiple Card Measurements / Coordination Line .............................................................................................44
Multiple Segment Measurement.........................................................................................................................45
Multiple Chassis Synchronization with Trigger Line.........................................................................................45
Multiple Chassis Synchronization with LAN Events .........................................................................................46
DATA ACQUISITION................................................................................................................................................48
Data Flow ...........................................................................................................................................................48
FIFO ...................................................................................................................................................................48
Data Streaming ...................................................................................................................................................49
Sampling Rates...................................................................................................................................................50
Overloads and Open Transducer Detection........................................................................................................52
Time Stamp ........................................................................................................................................................52
Additional Data...................................................................................................................................................53
MEASUREMENT PROCESS .......................................................................................................................................54
Measurement Setup ............................................................................................................................................54
Measurement Initiation.......................................................................................................................................54
Measurement Loop.............................................................................................................................................54
Arming................................................................................................................................................................55
Triggering...........................................................................................................................................................55
Data Retrieval.....................................................................................................................................................56
Events.................................................................................................................................................................57
USING WITH EMX-1434.........................................................................................................................................58
Stimulus Signal Generation ................................................................................................................................58
Tachometer Inputs..............................................................................................................................................58
Digital Input and Output.....................................................................................................................................60
WHERE TO FIND MORE INFORMATION....................................................................................................................61
Driver API Reference .........................................................................................................................................61
Other Manuals ....................................................................................................................................................61
Specification Information...................................................................................................................................61
SECTION 5...............................................................................................................................................................62
DIGITIZER MODULE DESCRIPTIONS ........................................................................................................................62
Overview ............................................................................................................................................................62
Digitizer Feature Comparison.............................................................................................................................62
Power Consumption ...........................................................................................................................................62
Table 5.2: Power Consumption ..........................................................................................................................63
Block Diagrams..................................................................................................................................................63
Input Types.........................................................................................................................................................64
Break out box Output .........................................................................................................................................68
Bridge Transducer ..............................................................................................................................................69
AC Input Coupling .............................................................................................................................................69
IEPE Input Fault Detection.................................................................................................................................70
TEDS..................................................................................................................................................................70

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4 Preface
Analog to Digital Converter (ADC) ...................................................................................................................71
Anti-Alias Filter..................................................................................................................................................71
Flatness...............................................................................................................................................................75
Group Delay .......................................................................................................................................................77
ACCESSORIES .........................................................................................................................................................82
Break-Out-Box (BOB)........................................................................................................................................82
Ordering Information..........................................................................................................................................85
APPENDIX A...............................................................................................................................................................86
DIGITAL ANTI-ALIAS FILTER AND MEASUREMENT SPAN .......................................................................................86
Overview ............................................................................................................................................................86
Sample Rates and Nominal Spans ......................................................................................................................87
Group Delays......................................................................................................................................................87
APPENDIX B...............................................................................................................................................................89
PHASE MEASUREMENT AND CORRECTION..............................................................................................................89
Overview ............................................................................................................................................................89
Sub-sample Trigger Delay..................................................................................................................................89
AC Coupling Filter .............................................................................................................................................90
Transducer Phase Delay .....................................................................................................................................90
APPENDIX C...............................................................................................................................................................91
TEDS .....................................................................................................................................................................91
Overview ............................................................................................................................................................91
MICROLAN (MLAN).............................................................................................................................................93
Introduction ........................................................................................................................................................93
Programming MLAN .........................................................................................................................................94
DS2430 Commands............................................................................................................................................97
DS2431 Commands..........................................................................................................................................105
Additional Notes...............................................................................................................................................105
APPENDIX D.............................................................................................................................................................107
CALIBRATION .......................................................................................................................................................107
Overview ..........................................................................................................................................................107
Self-Calibration ................................................................................................................................................107
Factory Calibration...........................................................................................................................................107
Self/Full Calibration Adjustments File.............................................................................................................108
Self Calibration Log .........................................................................................................................................109
Calibration Results ...........................................................................................................................................109
Self/Full Calibration Report .............................................................................................................................110
APPENDIX E.............................................................................................................................................................112
MULTIPLE CHASSIS SYSTEM.................................................................................................................................112
Overview ..........................................................................................................................................................112
Master and Slave ..............................................................................................................................................112
Synchronization Performance...........................................................................................................................113
APPENDIX F.............................................................................................................................................................115
MEMORY LISTING AND CLEARING PROCEDURE...................................................................................................115
Overview ..........................................................................................................................................................115
INDEX.......................................................................................................................................................................117

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Preface 5
CERTIFICATION
VTI Instruments Corp. (VTI) certifies that this product met its published specifications at the time of shipment from
the factory. VTI further certifies that its calibration measurements are traceable to the United States National Institute
of Standards and Technology (formerly National Bureau of Standards), to the extent allowed by that organization’s
calibration facility, and to the calibration facilities of other International Standards Organization members. Note that
the contents of this document are subject to change without notice.
WARRANTY
The product referred to herein is warranted against defects in material and workmanship for a period of one year from
the receipt date of the product at customer’s facility. The sole and exclusive remedy for breach of any warranty
concerning these goods shall be repair or replacement of defective parts, or a refund of the purchase price, to be
determined at the option of VTI. Note that specifications are subject to change without notice.
For warranty service or repair, this product must be returned to a VTI Instruments authorized service center. The
product shall be shipped prepaid to VTI and VTI shall prepay all returns of the product to the buyer. However, the
buyer shall pay all shipping charges, duties, and taxes for products returned to VTI from another country.
VTI warrants that its software and firmware designated by VTI for use with a product will execute its programming
when properly installed on that product. VTI does not however warrant that the operation of the product, or software,
or firmware will be uninterrupted or error free.
LIMITATION OF WARRANTY
The warranty shall not apply to defects resulting from improper or inadequate maintenance by the buyer, buyer-
supplied products or interfacing, unauthorized modification or misuse, operation outside the environmental
specifications for the product, or improper site preparation or maintenance.
VTI Instruments Corp. shall not be liable for injury to property other than the goods themselves. Other than the limited
warranty stated above, VTI Instruments Corp. makes no other warranties, express or implied, with respect to the
quality of product beyond the description of the goods on the face of the contract. VTI specifically disclaims the
implied warranties of merchantability and fitness for a particular purpose.
TRADEMARKS
Java Runtime Environment™ are trademarks or registered trademarks of Sun Microsystems, Inc. or its subsidiaries in
the United States and other countries. LabVIEW™ and LabWindows/CVI™ are trademarks of National Instruments
Corporation. Visual Basic®, Windows®, and Internet Explorer® are registered trademarks of the Microsoft
Corporation or its subsidiaries. Linux® is a registered trademark of the Linux Foundation. IVI™is a trademark of the
IVI Foundation. Bonjour™ is a trademark of Apple, Inc.
RESTRICTED RIGHTS LEGEND
Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subdivision (b)(3)(ii) of the
Rights in Technical Data and Computer Software clause in DFARS 252.227-7013.
VTI Instruments Corp.
2031 Main Street
Irvine, CA 92614-6509 U.S.A.

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Introduction 7

VTI Instruments Corp.
8 Introduction
DE C L A R A T I O N O F CO N F O R M I T Y
Declaration of Conformity According to ISO/IEC Guide 22 and EN 45014
MANUFACTURER’S NAME VTI Instruments Corporation
MANUFACTURER’S ADDRESS 2031 Main Street
Irvine, California 92614-6509
PRODUCT NAME Smart Dynamic Signal Analyzer
MODEL NUMBER(S) EMX-4250, EMX-4350 and EX-4380 DSA Modules
PRODUCT OPTIONS All
PRODUCT CONFIGURATIONS All
VTI Instruments. declares that the aforementioned product conforms to the requirements of the LowVoltage
Directive 73/23/EEC and the EMC Directive 89/366/EEC (inclusive 93/68/EEC) and carries the “CE”
mark accordingly. The product has been designed and manufactured according to the following
specifications:
SAFETY IEC 61010-1:2001 (2nd Ed.); EN61010-1:2001 (2nd Ed.)
EMC IEC 61326-1:2006
EN55011 Class A Group
IEC 61000-4-2
IEC 61000-4-3
IEC 61000-4-4
IEC 61000-4-5
IEC 61000-4-6
IEC 61000-4-8
IEC 61000-4-11
CISPR 11 (2004) Class A
ICES-001 (Issue 4)
AS/NZS CISPR 11 (2nd ED) Class A
FCC Part 15 Subpart B Class A
This product was tested in a typical configuration.
I hereby declare that the aforementioned product has been designed to be in compliance with the relevant sections of the
specifications listed above as well as complying with all essential requirements of the Low Voltage Directive.
July 2013
Steve Mauga, QA Manager

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Introduction 9
GENERAL SAFETY INSTRUCTIONS
Review the following safety precautions to avoid bodily injury and/or damage to the product. These
precautions must be observed during all phases of operation or service of this product. Failure to
comply with these precautions, or with specific warnings elsewhere in this manual, violates safety
standards of design, manufacture, and intended use of the product. Note that this product contains
no user serviceable parts or spare parts.
Service should only be performed by qualified personnel. Disconnect all power before servicing.
TERMS AND SYMBOLS
These terms may appear in this manual:
WARNING
Indicates that a procedure or condition may cause bodily injury or death.
CAUTION
Indicates that a procedure or condition could possibly cause damage to equipment
or loss of data.
These symbols may appear on the product or in the manual:
ATTENTION - Important safety instructions
Indicates hazardous voltage.
Frame or chassis ground
Indicates that the product was manufactured after August 13, 2005. This mark is
placed in accordance with EN 50419, Marking of electrical and electronic
equipment in accordance with Article 11(2) of Directive 2002/96/EC (WEEE).
End-of-life product can be returned to VTI by obtaining an RMA number. Fees
for take-back and recycling will apply if not prohibited by national law.
WARNINGS
Follow these precautions to avoid injury or damage to the product:
Use Proper Power Cord
To avoid hazard, only use the power cord specified for this product.
Use Proper Power Source
To avoid electrical overload, electric shock, or fire hazard, do not use
a power source that applies other than the specified voltage.
The mains outlet that is used to power the equipment must be within
3 meters of the device and shall be easily accessible.
User Proper Fuse
To avoid fire hazard, only use the type and rating fuse specified for
this product.
Power Consumption
Prior to using EMX series plug-in modules, it is imperative that the
power consumption of all modules that will be installed in the
mainframe be calculated for all power supply rails. The required
information can be found in Appendix B of the EMX Series User’s
Manual (P/N: 82-0142-100).Failure to do so may result in
damaging the instrument and the chassis.

VTI Instruments Corp.
10 Introduction
WARNINGS (CONT.)
Avoid Electric Shock
To avoid electric shock or fire hazard, do not operate this product
with the covers removed. Do not connect or disconnect any cable,
probes, test leads, etc. while they are connected to a voltage source.
Remove all power and unplug unit before performing any service.
Service should only be performed by qualified personnel.
Ground the Product
This product is grounded through the grounding conductor of the
power cord. To avoid electric shock, the grounding conductor must
be connected to earth ground.
Operating Conditions
To avoid injury, electric shock or fire hazard:
-
Do not operate in wet or damp conditions.
-
Do not operate in an explosive atmosphere.
-
Operate or store only in specified temperature range.
-
Provide proper clearance for product ventilation to prevent
overheating.
-
When selecting the installation location, be certain that there is
enough space around the power plug and the outlet so that they
are readily accessible. Do not insert the power cord into an
outlet where accessibility to the plug cord is poor.
-
All unused slots should be closed with the dummy filler panels
to ensure a proper air circulation. This is critical to avoid
overheating of the cards.
-
DO NOT operate if any damage to this product is suspected.
Product should be inspected or serviced only by qualified
personnel.
Improper Use
The operator of this instrument is advised that if the equipment is
used in a manner not specified in this manual, the protection
provided by the equipment may be impaired.
Conformity is checked by inspection.

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Introduction 11
SUPPORT RESOURCES
Support resources for this product are available on the Internet and at VTI Instruments customer
support centers.
VTI Instruments Corp.
World Headquarters
VTI Instruments Corp.
2031 Main Street
Irvine, CA 92614-6509
Phone: [phone]
Fax: [phone]
VTI Instruments
Cleveland Instrument Division
5425 Warner Road
Suite 13
Valley View, OH 44125
Phone: [phone]
Fax: [phone]
AMETEK Instruments India Pvt. Ltd.
VTI - Bangalore Instrument Division
Divyasree N R Enclave, Block A,
4th Floor, Site No 1, EPIP Industrial Area,
Whitefield, Bengaluru 560066, India
Phone: [phone]
Fax: [phone]
Technical Support
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Visit http://www.vtiinstruments.com for worldwide support sites and service plan information.

VTI Instruments Corp.
12 Introduction
SECTION 1
INTRODUCTION
OVERVIEW
The EMX-4250, EMX-4251, EMX-4350 and EMX-4380 (referred to collectively as the
“EMX-4250/4350/4380”) are Smart Dynamic Signal Analyzers incorporate best-in-class analog
design methodology to deliver industry leading measurement accuracy. This instrument is ideal for
a wide range of applications including noise, vibration, and harshness (NVH); machine condition
monitoring; rotational analysis; acoustic test; modal test; as well as general purpose high speed
digitization and signal analysis.
FEATURES
Optimized Performance
Measurement performance is elevated to new levels with up to 625 k samples / second / channel
data rates, true differential inputs with superior common mode performance (CMRR of -120 dB)
reducing unwanted noise and interference, an industry leading spurious free dynamic range (SFDR
of -125 dB) offering exceptional measurement fidelity, and uncompromised IEPE excitation
flexibility, fully programmable from 2 mA to 20 mA, to maximize transducer performance and
response. Industry-leading -125 dB spurious free dynamic range (SFDR) is a key measure of the
superior measurement fidelity provided by this instrument
Self-Calibration
Runtime self-calibration ensures that instruments deliver the most accurate results possible by
compensating for ambient temperature fluctuations, without the need to disconnect field wiring.
This maximizes measurement accuracy across the entire measurement path using precision internal
voltage sources to validate and adjust coefficients. This eliminates inaccuracies generated by
internal circuitry temperature gradients. Embedded NIST traceable calibration eliminates lengthy
test system down-time, simplifies calibration processes, and reduces spare equipment requirements,
maximizing facility up-time and utilization with this completely automated embedded process. All
internal calibration can be performed in-place without removing instrumentation.
There are two BNC connectors in the rear panel of EMX-4016B/EMX4016M BoB; one for trigger
input and one for calibration output. The calibration output is used to calibrate the built-in calibration
signals used by the EMX-425X module to perform self-calibration. The trigger input is used for
trigger the digitizer by an external signal.
“Best-in-Class” Software
X-Modal is an experimental modal analysis software features intuitive task oriented user interfaces,
extensive modal parameter estimation algorithms, parallel display capabilities, flexible data
management, and unparalleled channel expandability. This software is MATLAB based open source.

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Introduction 13
EXLab is an easy to use, turn-key, data acquisition solution featuring intelligent configuration
capabilities, automatic device discovery, extensive time and frequency domain data visualization,
and post-acquisition display and analysis tools.
Flexible Application Programming Options
EMX-4250/4350/4380 module is delivered with an application programming interface (API) that
conforms to the industry standard IVI™specifications for its class. The IVI drivers port seamlessly
into the most commonly used application development environments such as LabView™,
LabWindows/CVI™, Matlab®, and Visual Studio®, among others. The intuitive APIs simplify
programming and expose all available instrument functionality, eliminating the need for low-level
coding. The EMX series driver is designed to support advanced functionality such as:
•Sophisticated arming and triggering options.
•Multiple FIFO models.
•Streaming API for high speed data transfer.
•LXISync API and IEEE1588 to synchronize with other LXI devices over Ethernet.
While IVI is intended for Windows®-based operating systems, VTI’s innovative approach to driver
development allows users to develop their applications using an IVI-like interface that can be
imported into Linux®and other operating systems. This flexibility provides system developers with
true OS independence without the need to sacrifice the convenience that instrument drivers deliver.

VTI Instruments Corp.
14 Introduction
PREPARATION FOR USE
UNPACKING
When an EMX-4250/4350/4380 is unpacked from its shipping carton, the contents should include
the following items:
•An EMX-4250, EMX-4350, or EMX-4380
•VTI Instruments Distribution CD
All components should be immediately inspected for damage upon receipt of the unit. ESD
precautions should be observed while unpacking and installing the instrument into a PXI Express
chassis. The part number, model number, and serial number can be found on the side cover of the
card as shown below.
Figure 1-1: Digitizer Serial Number Location
INSPECTING THE EMX-4250/4350/4380
The EMX-4250/4350/4380 modules were carefully inspected both mechanically and electrically
before shipment. They should be free of marks or scratches and they should meet their published
specifications upon receipt. If the module was damaged in transit, do the following:
•Save all packing materials
•File a claim with the carrier
•Call a VTI Instruments sales and service office

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Introduction 15
INSTALLATION
INSTALLING EMX-4250/4350/4380
1) Set up the PXI Express chassis. See the chassis’installation guide for assistance.
2) Make sure the PXI Express chassis is powered off.
3) Select a PXIe slot or a hybrid slot in the PXI Express chassis for the EMX-4250/4350/4380
and insert it carefully.
4) After the EMX-4250/4350/4380 is inserted all the way, secure it with the screws at the top
and bottom of the EMX-4250/4350/4380 front panel.
INSTALLING EMX-4016B/EMX-4016M
1) The EMX-4016B/ EMX-4016M BoB is supplied in a standard 19" rack mounting enclosure.
For bench use, we recommend that the four self-adhesive rubber feet are attached to the
bottom panel.
2) Connect the power supply adaptor, and ensure correct voltage level and necessary grounding
3) Connect the 25 pin Micro D-Sub cables from EMX-4250/51 to the BoB. Observe that J1 & J2
should not be interchanged, if you are using EMX-4250. If you are using EMX-4251, connect
the cable only to J1 (Ch-1 to Ch-8)
4) Connect transducer cables to appropriate inputs, and buffered outputs to external equipment
5) The EMX-4016B/ EMX-4016M BoB does not use internal fans for forced air cooling. It does
not require special cooling arrangements. Do not keep it near to heat sources, and ensure
thermally stable operating environment (with ambient environment conditions as per
specifications)
LED STATUS INDICATIONS:
1) Power LED (Glows when the power supply adaptor is connected)
2) Bi-colour Input signal health monitoring LED (LEDs will be GREEN during normal
operation and will turn RED if an OPEN or SHORT is detected by the digitizer module when
the input is set to IEPE)
DETERMINE SYSTEM POWER REQUIREMENTS
The power requirements of the PXIe module are provided in the Power Consumption section (page
62). As with any backplane-based system where modules share power, such as VXI and PXI, the
possibility exists where certain plug-in module combinations can draw too much power from a
power supply rail. As such, it is imperative that the chassis provide adequate power for the modules
installed.
INSTALLING DRIVER SOFTWARE
After the hardware has been assembled, the next step in installing an EMX-4250/4350/4380 is to
install the instrument driver. Refer to the Getting Started with the Instrument in Section 2 to continue
the installation process.

VTI Instruments Corp.
16 Introduction
STORAGE AND SHIPMENT
STORING INSTRUMENTS
Store the module in a clean, dry, and static-free environment. For other requirements, see storage
and transport restrictions in Specification.
TRANSPORTING INSTRUMENTS
Package the module using the original factory packaging or packaging identical to the factory
packaging. Containers and materials identical to those used in factory packaging are available
through VTI Instruments offices.
If returning the module to VTI Instruments for service, contact a VTI Service Center to set up an
RMA. The following information will be required:
•Serial number
•Model number
•Type of service required
•Return address
•If applicable, a description of the problem that is being encountered which provides specific
detail relating the instrument being returned.
In any correspondence, refer to the serial number and RMA number. Mark the container
“FRAGILE”to ensure careful handling. If it is necessary to package the module in a container other
than the original packaging, observe the following (although use of other packaging material is not
recommended):
•Wrap the module in heavy paper or anti-static plastic
•Protect the front panel with cardboard
•Use a double-wall carton made of at least 350 lbs test material
•Cushion the module to prevent damage
CAUTION Do not use styrene pellets in any shape as packing material for the module. The pellets do not
adequately cushion the module and do not prevent the module from shifting in the carton. In
addition, the pellets create static electricity that can damage electronic components.

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Introduction 17
SPECIFICATIONS
DIGITIZER SPECIFICATIONS
EMX-4250/4251
EMX-4350
EMX-4380
Input Specifications
No. of Channels
4250: 16ch / 4251: 8ch
4ch
4ch
Input Connector
25-pin Micro-D
Molex 83614-9012
BNC, shell floating from chassis ground
Center Pin = HI; Shell = LO
Input Type
Differential
Pseudo-differential
Differential
Differential
Single-Ended
Input Ground Isolation
None
None
ON or OFF
ON: 50 Vdc, 100 MΩ
Input Coupling
AC, DC
AC, DC
AC
Common Mode Rejection (CMR)
@ 100 Hz, AC or DC Coupling
<-80 dB
<-80 dB
<-80 dB
Input Over-Voltage Protection
Differential
±40 V
±40 V
±40 V
Pseudo-Differential
HI: ±40V
LO: ±10V
N/A
N/A
Input Impedance
Differential Voltage
4 MΩ // 200 pF
2.4 MΩ // 140 pF
6 MΩ // 90 pF
Pseudo-Differential
HI: 2 MΩ // 200 pF
LO: 100 Ω
N/A
N/A
Charge
N/A
N/A
500 MΩ
Input Ranges
Voltage/IEPE (±V-pk)
0.1, 0.2, 0.5, 1, 2, 5, 10
0.1, 1, 10, 20
Charge (±pC-pk)
N/A
N/A
100, 1k, 10k
IEPE
IEPE Current (mA)
4.5, 10 mA
0-20 mA
<0.1 mA resolution
4.5, 10 mA
IEPE Current Accuracy
±5%
±0.1 mA
±5%
IEPE Compliance Voltage @ 5 mA
>21 V
IEPE Open/Short Fault Detection
Break-Out Box LED &
Software
Front Panel LED & Software
TEDS
IEEE 1451.4 / 1-wire
Max. Input Shunt Capacitance for
TEDS to work
2,600 pF
2,600 pF
2,600 pF
Measurement Accuracy
Amplitude Accuracy @ 1 kHz
Voltage & IEPE
Typ.: ±0.02 dB
Max.: ±0.05 dB
Typ.: ±0.02 dB
Max.: ±0.05 dB
Typ.: ±0.02 dB
Max.: ±0.05 dB
Charge
N/A
N/A
Typ.: ±0.1 dB
Max.: ±0.15 dB
Residual DC Offset
Voltage & IEPE (AC or DC Coupling)
0.1 V, 0.2 V: <±0.2 mV
Other Ranges: <±2 mV
0.1V, 1V: <±0.1 mV
10V, 20V: <±1 mV
Charge
N/A
N/A
<1pC
Channel-to-Channel Matching
Amplitude Match, @ 1 kHz
±0.005 dB
±0.01 dB
Phase Match @ 1 kHz
±0.002°
±0.002°
Phase Linearity
±0.05° up to 96 kHz
±0.05° up to 270 kHz
Phase Accuracy vs. Trigger
<0.1° @ 1 kHz
<0.1° @ 1 kHz
<0.1° @ 1 kHz
Frequency Response Characteristics
Slew Rate: 10% to 90% of Range
1.1 µs
0.5 µs
0.5 µs
AC Coupling -3 dB Corner (Hz)
IEPE/Volts: 0.24 Hz
IEPE/Volts: 0.5 Hz
IEPE/Volts: 0.20 Hz
Charge: 0.32 Hz
Maximum Bandwidth

VTI Instruments Corp.
18 Introduction
EMX-4250/4251
EMX-4350
EMX-4380
Volts (-0.2 dB), 625 kSa/s
N/A
270 kHz
270 kHz
Charge (-1 dB), 625 kSs/s, CSH=2 nF
N/A
N/A
270 kHz
Volts (-0.1 dB), 204.8 kSa/s
96 kHz
88 kHz
88 kHz
Alias Rejection, Typical, 10 V Range
-90 dB
-86 dB
ADC
ADC Resolution
24-bits
24-bits
24-bits
ADC Data Rate (Sa/s) (fDATA)
131,072: ÷1, ÷2, ÷4
204,800: ÷1, ÷2, ÷4
409,600: ÷1, ÷2, ÷4, ÷8
524,288: ÷1, ÷2, ÷4, ÷8
625,000: ÷1, ÷2, ÷4, ÷8
ADC Post-Decimation
÷2N, N=0, 1, .., 16
÷5: Optional
÷2N, N=0, 1, .., 16
÷5: Optional
ADC Pass-Band (0.0001 dB ripple)
0.454 * fDATA
0.424 * fDATA
ADC Pass-Band (-0.1 dB)
0.469 * fDATA
0.432 * fDATA
ADC Stop-Band (<-100 dB)
0.546 * fDATA
0.576 * fDATA
Group Delay
39 ÷ fDATA
28 ÷ fDATA
Dynamic Characteristics
Noise @ frequencies >100 Hz
0.1 V: 30 nV/√Hz
0.2 V: 30 nV/√Hz
0.5 V: 40 nV/√Hz
1 V: 50 nV/√Hz
2 V: 86 nV/√Hz
5 V: 200 nV/√Hz
10 V: 400 nV/√Hz
0.1 V: 30 nV/√Hz
1 V: 40 nV/√Hz
10 V: 270 nV/√Hz
20 V: 500 nV/√Hz
THD (dB) Typical @ 1 kHz
-86 dB
-100 dB
SFDR (dB) Typical, @1 kHz
0.1 V: -92dB
0.2 V: -98 dB
0.5 V: -106 dB
1 V: -112 dB
2 V: -118 dB
5 V: -120 dB
10 V: -120 dB
0.1 V: -92 dB
1 V: -112 dB
10 V: -124 dB
20 V: -130 dB
Channel-to-Channel Crosstalk, 1 kHz
-98 dB
0.1 V: -112 dB; Other
Ranges: -122 dB
Other
Built-In Self-Calibration
Yes
Yes
Yes (Voltage only)
On-board Memory
128MBytes
EMX-4250: 1.875 MSa/ch
EMX-4251: 3.75 MSa/ch
128MBytes
7.5 MSa/ch
Table 1.1 Digitizer Specifications
TRIGGER INPUT SPECIFICATIONS
EMX-4250/4251
EMX-4350
EMX-4380
Input Connector
25-pin Micro-D
Molex 83614-9012
Pins 5 (Trig) & 18 (Gnd)
SMB, shell connected to chassis ground
Input Type
Single-Ended
Single-Ended
Single-Ended
Input Impedance
100 kΩ // 220pF
100 kΩ // 220 pF
100 kΩ // 220 pF
Input Voltage
0 V to 3.3 V
0 V to 3.3 V
0 V to 3.3 V
Input HIGH (VIH)
>1.6 V
>1.6 V
>1.6 V
Input LOW (VIL)
<0.6 V
<0.6 V
<0.6 V
Input Over-Voltage Protection
-1 V to +7 V
-1 V to +20 V
-1 V to +20 V
Input Hysteresis
0.76 V
0.76 V
0.76 V
Table 2.2 Digitizer Trigger Input Specifications

www.vtiinstruments.com
Introduction 19
BREAK OUT BOX SPECIFICATIONS
EMX-4016
EMX-4016B
EMX-4016M
Input Specifications
No. of Channels
16 channels
16 channels
16 channels
Input Connector
BNC Isolated from Chassis
BNC Isolated from Chassis
RJ45 connector (8-pin), pinout
compatible with EX1629
Input Type
Differential
Differential
Differential
Input Range
±24V
±24V
±10Vpk Min.
Maximum Input Voltage: ±24V
Custom models can be made with
other voltage/gain ranges
Input Ground Isolation
No channel to channel
Ground Isolation
No channel to channel Ground
Isolation
No channel to channel Ground
Isolation
Input Coupling
AC/ DC coupling
AC/ DC coupling
DC coupling only
Input Impedance
(Buffered Output)
NA
10 MΩTypical each input to
ground, 20MΩdifferential.
10 MΩTypical each input to
ground, 20MΩdifferential.
Common Mode Rejection
(Buffered Output)
NA
86dB Typical, 80dB Min.
<10kHz (0°C to +55°C)
86dB Typical, 80dB Min. <10kHz
(0°C to +55°C)
Channel-to-Channel
Crosstalk
NA
-60dB Typical, <1kHz
Overdriving 1 channel does not
affect performance of other
channels
-60dB Typical, <1kHz
Overdriving 1 channel does not
affect performance of other
channels
Input Protection
ESD: Bidirectional TVS
IEC61000-4-2, ±30kV
Contact & Air
ESD: Bidirectional TVS
IEC61000-4-2, ±30kV Contact
& Air
ESD: Bidirectional TVS IEC61000-
4-2, ±30kV Contact & Air
Bridge Zero/Balance
Not Supported
No zero/balance adjustment
No zero/balance adjustment
Bridge Configuration
Not Supported
Not Supported
Full Bridge only
Transducer support
IEPE transducers or
piezoelectric transducers with
a Remote Charge Convertor
(RCC)
IEPE transducers or
piezoelectric transducers with a
Remote Charge Convertor
(RCC)
Full Bridge type sensors
25pin DSUB Output Specifications
No. of Channels
16 channels
16 channels
16 channels
Output Connector
25-pin Molex 83614-9012
25-pin Molex 83614-9012
25-pin Molex 83614-9012
Gain
Pass-through
Pass-through
Pass-through
Output Swing
±10Vpk
±10Vpk
±10Vpk
Bandwidth
-3dB: ≥ 100 kHz Typical
-3dB: ≥ 100 kHz Typical
-3dB: ≥ 100 kHz Typical
Output Ground Isolation
No channel to channel
Ground Isolation
No channel to channel Ground
Isolation
No channel to channel Ground
Isolation
Buffered Output Specifications
No. of Channels
16 channels
16 channels
Type
BNC Single-Ended
BNC Single-Ended
Gain
1 ±0.1%
1 ±0.05% Typical, ±0.1% Max.
(0°C to +55°C)
Output Swing
±10Vpk
±10Vpk
Output Current Drive
10mA Minimum
10mA Minimum

VTI Instruments Corp.
20 Introduction
EMX-4016
EMX-4016B
EMX-4016M
Offset/Zero
< 10mV
<0.5mV Typical, <1mV Max.
(0°C to +55°C)
Typical Stability: ±20uV/°C
Output Impedance
< 50Ω
< 50Ω
Noise
30 µVRMS Typical;
60 µVRMS Max
30 µVRMS Typical;
60 µVRMS Max.
Bandwidth
-3dB: ≥ 200 kHz Typical
-3dB: ≥ 100 kHz Typical
Slew Rate
20V/us Typical
> 10 V/µs
Output Ground Isolation
No channel to channel Ground
Isolation
No channel to channel Ground
Isolation
Output Protection
ESD: ±32V Unidirectional TVS
IEC61000-4-2, ±15kV Contact,
±30kV Air
ESD: Bidirectional TVS IEC61000-
4-2, ±15kV Contact, ±30kV Air
Voltage Excitation specification (EMX-4016 M Only)
Channel-to-Channel
Isolation
All channels share the same ground
Each channel provides separate excitation circuitry
Voltage Excitation
Protection
ESD: Bidirectional TVS IEC61000-4-2, ±30kV Contact & Air
Crosstalk: A Short does not affect Excitation accuracy in other channels
Voltage Excitation
Levels: +5VDC & +10VDC Set for all channels by one switch on front panel
Accuracy: ±0.16% Typical; ±0.27% Max.; ±0.31% (0°C to +50°C)
Typical Stability: ±10 ppm/°C ±7µV/°C ±100ppm/year
Load regulation: <0.05% for load change < 32mA
Crosstalk: <0.01% effect on other channels from load changes
Current Limit: 48mA ±4mA; Output Impedance: <0.1Ω @ <60Hz
Noise: 20 µVRMS Typical, 50kHz bandwidth
Custom models can be made with other voltage excitation levels
Voltage Excitation
Monitoring
NO monitoring
Excitation Sensing
None, Optional: Unit can be modified to provide remote excitation sensing
Table 3.3 Break out box Output Specifications
ENVIRONMENTAL SPECIFICATIONS
EMX-4250/4251
EMX-4350
EMX-4380
EMX-4016B / EMX-4016M
Operating Environment
Operating Temperature
0°C to +55°C
Relative Humidity, Non
Condensing
10% to 90%
Storage Environment
Storage Temperature
-40°C to +70°C
-40°C to +80°C
Relative Humidity, Non
Condensing
5% to 95%
Altitude
3,000 m
Pollution Degree
2
Shock and Vibration
Sinusoidal
5 Hz to 500 Hz, 0.3 grms. Tested per MIL-PRF-2880F Class 3
Shock
30 g peak, half-sine, 11 ms pulse. Tested per MIL-PRF-2880F Class 3
Table 4.4 Environmental Specifications
Notes