LTT 24 User manual

1 - 32 Channel
LTT 24
Installation Guide &
User Manual
LTT Labortechnik Tasler GmbH
Friedrich-Bergius-Ring 15
D-97076 Würzburg

LTT24 - TransientRecorder
Multi-functional 24 bit data acquisition up to 4MHz
LTT Labortechnik Tasler GmbH
The multi-functional data acquisition device LTT24 combines the functionality of a
Transient-Recorder with 24 bit ADC and 4 MSample/s per channel with amplification
functions for voltage, current, IEPE (ICP®), strain gauge, resistance, temperature, charge
and more.
With all error sources consistently minimized, the full precision of the LTT24 preamp can be
exploited. Distortion and noise together are as good as -119 dB and allow an ENOB
(effective number of bits) of true 16 bit across a wide range of frequencies and amplitudes.
This manual will guide you through proper LTT24 device installation. In addition you will get a
detailed explanation of available couplings and how to connect your sensors to the LTT24
device.

All rights reserved. No parts of this work may be reproduced in any form or by any means - graphic, electronic, or
mechanical, including photocopying, recording, taping, or information storage and retrieval systems - without the written
permission ofthe publisher.
Products that are referred to in this document may be either trademarks and/or registered trademarks of the respective
owners. The publisher and the author make no claim to these trademarks.
While every precaution has been taken in the preparation ofthis document, the publisher and the author assume no
responsibility for errors or omissions, or for damages resulting from the use of information contained in this document or
from the use of programs and source code that may accompany it. In no eventshall the publisher and the author be liable
for any loss of profit or any other commercial damage caused or alleged to have been caused directly or indirectly by this
document.
Printed: Dezember 2015
LTT24 Manual
© 2015 LTT Labortechnik Tasler GmbH
Publisher Special thanks to:
All the people who contributed to this document.
Managing Editor
Technical Editors
Cover Photo
LTT Labortechnik Tasler GmbH
Christian Völkel
Michael Tasler
Stefan Knorr
Sibylle Rohr
Production
LTT GmbH 2015
Manual Version
V1.0.39

5
Contents
© 2015 LTT Labortechnik Tasler GmbH
Table of Contents
Part I Installation 8
................................................................................................................................... 81 Unpacking
................................................................................................................................... 92 Setup and Connections
................................................................................................................................... 103 Software
Part II Operation 12
................................................................................................................................... 131 Overview
................................................................................................................................... 142 Couplings (Sensor Types)
.......................................................................................................................................................... 15Single Ended (SE) Operation
.......................................................................................................................................................... 16Differential Ended (DE) Operation
.......................................................................................................................................................... 17IEPE (ICP™)
.......................................................................................................................................................... 18STRAIN GAUGE: Quarterbridge
.......................................................................................................................................................... 19STRAIN GAUGE: Halfbridge
.......................................................................................................................................................... 20STRAIN GAUGE: Fullbridge
Part III Optional Features 22
................................................................................................................................... 221 Extended Channel Features
.......................................................................................................................................................... 22IEPE
.......................................................................................................................................................... 22STRAIN GAUGE
................................................................................................................................... 222 Internal Harddisk
................................................................................................................................... 233 Accumulator
Part IV Specifications 26
................................................................................................................................... 261 Technical Specifications
.......................................................................................................................................................... 26Data Recording
.......................................................................................................................................................... 26Data Transfer Rate
.......................................................................................................................................................... 26Input Characteristics
.......................................................................................................................................................... 27Output Characteristics
.......................................................................................................................................................... 27Signal Conditioning
.......................................................................................................................................................... 28Operation Conditions
................................................................................................................................... 292 DIN socket pin assignment
................................................................................................................................... 303 Binder Series 693 power plug
Part V Troubleshooting 32
................................................................................................................................... 321 Problems with computer connection
Index 35

Installation
Part I

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1 Installation
Before you start with your new LTT24, please read the following chapters carefully. Unless
otherwise noted, instructions apply to all device types with any number of channels or optional
features.
If your LTT24 device or parts of the accessory seem to be damaged or incomplete, please contact
LTTimmediately. Do not disassemble the device or the delivered power supply on your own! When
using your own power supply, refer to chapter Specifications for notes on power requirements.
1.1 Unpacking
Every LTT24 device comes with a set of accessories that is common to all device types. Check the
following list for completeness:
LTT24 device
Power supply, available in different versions
USB 3.0 cable A-B male/male, 1.8m
CD with software and documentation
LTT24 power supply, necessary cables, softw are and documentation
Depending on the configuration of your LTT24 device, some additional parts may be enclosed.
Please check delivery note carefully for completeness.
If you have ordered additional hardware with your LTT24 device (e.g. notebook or sensors), please
refer to the corresponding manuals for setup and operation.
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1.2 Setup and Connections
Your LTT24 comes with an appropriate power supply. Depending on the number of channels and
embedded features, a 80W, 120W or 320W version is delivered.
Different pow er supply units for different device types
Binder S. 693 Plug
Connect the Binder Series 693 plug of the power supply unit to the power socket of your LTT24 and
the Schuko® plug to the grid. The connection to the Personal Computer (PC) can be established in
different ways. Select the option you have ordered:
1. USB 3.0 : Plug the USB cable into the ( blue ) USB socket of your LTT24 and to a USB 3.0 port of
your computer. Be aware that using a USB 2.0 (or slower) port will result in lower data
transfer rates! There is no need to install any drivers for connecting LTT24 devices! Turn
on your LTT24 with the power switch at the rear.
2. Ethernet : At press date of this manual, ethernet option for the LTT24 is realized by a separate
(19-inch or SBC) computer system. Connect this external computer system to power, USB
interface with the delivered cable to the LTT24 device and ethernet interface to your local network
(LAN). Please check for separate manuals or setup guides that are delivered with the external
computer in order to get additional information on default IP-address, cable setup and more. Turn
on the LTT24 with the power switch at the rear before you power up the external computer device.
Before installing the LTTpro software on your personal computer, please check if your LTT24 is
recognized by your computer.
Devices that are connected directly to a USB port of your computer should appear as "LTT24 USB
device" (mass storage) after powering up. At Microsoft Windows™ Systems you will find the LTT24
device in section disk drives of the Windows device manager.
External computer systems with ethernet interface should be checked with the ping command for
responsiveness. Contact the system- or network administrator of your company in order to integrate
the LTT24 ethernet interface in your LAN. If your system is secured by a firewall or your local
network is setup with active port filtering, you have to allowports 8110 (TCP), 8111 (UDP) and 8112
(UDP).
If the LTT24 is not recognized by your computer, please refer to chapter Troubleshooting to get
further information and assistance. 32

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1.3 Software
The LTTpro software for your LTT24 device running on Microsoft Windows™ comes bundled on
CD. You should always install the latest version of the software that comes with your device even if
you have already installed a previous version of LTTpro on your computer.
If you want to explore the LTTpro software before installation, the complete software manual is also
located on the CD (in Adobe Portable Document Format - you will need additional software in order
to open PDF files!).
After installation it is also possible to run LTTpro software in device emulation mode without real
devices attached. All software controls can be explored, a signal is simulated and essential workflow
can be exercised without a real device.
LTTpro software in device emulation m ode
LTTpro is also available for Linuxoperating system. Due to the multitude of Linuxdistributions on the
market, it is not possible to supply a standard setup for LTTpro on that operating system. If you want
to run LTTpro on Linux, please contact LTT software development for binaries and instructions.
If you want to implement LTT24 device(s) in your own measurement or analysis product you can
use ltt2api libraries for complete control and data handling on our devices. Visit our website (http://
www.ltt24.eu) or contact our software support to get further information on ltt2api.

Operation
Part II

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2 Operation
The modular concept of the LTT24 allows different (hardware) configuration with each channel.
While all channels implement VOLT and CURRENT coupling, other features like IEPE, STRAIN
GAUGE or CHARGE are optional and can be ordered individually.
In order to achieve most flexibility, each channel of an LTT24 comes with an 8-pole DIN socket in
addition to a conventional BNC jack. In the following chapters we will describe the pin assignment of
the different couplings - please read them carefully because there are very important notes on
safety precautions and range limits.
While each channel has individual LEDs for socket selection and active supply, the LTT24 also
comes with three global LEDs for common status information:
Status : green signals device powered up and running in normal condition, red indicates error
Trigger : off signals no trigger, orange signals waiting for trigger, green signals fired trigger
Data : off signals no data, green (blinking) signals data transfer, red signals error condition
Normal Device
Operation
W aiting for Trigger
Trigger w as fired
With small display sizes in LTTpro a lot of small packets are transferred from LTT24 to your
personal computer resulting in a heavily flushing Data LED. With higher data rates (large display
sizes) the Data LED seems to remain permanently on.
If Data LED turns red in constant intervals, the combination of sample clock, active channels and
display size exceeds available RAM buffer - not all data will be recorded or transferred to your
computer.
If Status LED turns red , a severe error condition has reached. Turn off device immediately and
check for proper environment conditions.

Operation 13
© 2015 LTT Labortechnik Tasler GmbH
2.1 Overview
The default hardware configuration of an LTT24 channel has a DIN socket and a BNC jack with the
following pin assignment. See the following chapters for a description of the different sensortypes
and measurement applications.
Pin
Name
Description
1
P+
Positive Supply
2
GND
Channel Ground
3
IN+
Positive Input
4
P-
Negative Supply
5
IN-
Negative Input
6
S+
Sense+ (Track A with Pulse Option)
7
CC
Constant Current (Track Zero with Pulse
Option)
8
TEDS
TEDS (Track A with Pulse Option)
LTT24 DIN socket (front view )
BNC jack
Keep in mind that not all signals are available with all configurations. Several signals depend on
hardware or firmware features, e.g. Track A,B and Z are available only with pulse recognition
option.
Note that even if IN+ signal of BNC jack goes to the same signal path as PIN 3 of the DIN socket
and ChnGround is same as PIN 2 of the DIN socket, only one interface (DIN or BNC) is available at
a time.
Caution: Channels that come with Pulse Recognition or DACout option have ChnGround and
Pin 2 shortened all the time!

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2.2 Couplings (Sensor Types)
This chapter describes all available couplings composite to their connection diagram. While Single-
Ended (SE) operation affects both interfaces, all other couplings will describe only DIN socket. The
following couplings will be described:
Single Ended (SE) Operation
Differential Ended (DE) VOLT
IEPE (ICP™)
STRAIN GAUGE: Quarterbridge
STRAIN GAUGE: Halfbridge
STRAIN GAUGE: Fullbridge
You will see activity of DIN socket or BNC jack at the channel LEDs. Green LED signals channel
activity, orange LED signals active supply.
DIN IN active
BNC IN active
15
16
17
18
19
20

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2.2.1 Single Ended (SE) Operation
Single Ended (SE) measurement can be realized on both, BNC jack and DIN socket with the
following couplings:
VOLT SE (AC, DC)
IEPE (ICP®)
CHARGE SE
CURRENT
SE pin assignment
In CURRENT coupling, the measuring input is bridged with a 5.1 shunt resistor .
Caution: The 5.1 shunt resistor in CURRENT operation can damage inappropriate sources
or sensors. Make sure that attached source is able to drive low-impedance devices.
Caution: In CURRENT operation (AC and DC), currents above ±200 mA will heat up the 5.1
shunt resistor and will eventually damage the amplifier!

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2.2.2 Differential Ended (DE) Operation
Differential Ended (DE) measurement with DIN socket:
VOLT (DE)
CHARGE (DE)
DE pin assignment
Note : With DUAL-BNC option VOLT (DE) and CHARGE (DE) mode is also available on Dual-BNC
jack.

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© 2015 LTT Labortechnik Tasler GmbH
2.2.3 IEPE (ICP™)
Pin assignment for IEPE (ICP™)measurement. Normally, IEPE sensors are attached with 2-wires.
Depending on 2-wire, 3-wire or 4-wire measurement the dotted lines have to be used.
IEPE pin assignment
The above circuit can also be used for temperature sensors, current driven (quarterbridge) strain
gauges and more.
You can determine cable impedance by changing from4-wire to 3-wire to 2-wire operation:
2-wire : Constant Current (CC) is internally bridged to IN+, IN- is bridged to ChnGround (GND)
3-wire : IN- is bridged to ChnGround (GND), Constant Current has to be connected
4-wire : ChnGround and Constant Current have to be connected in addition to IN+ and IN-

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2.2.4 STRAIN GAUGE: Quarterbridge
Quarterbridge strain gauge pin assignment. By default, a 120 or 350 resistor is used. Supply
range of the bridge is 0 .. 5V if not otherwise ordered.
Quarterbridge pin assigment
Note: Quarterbridge always uses Sense+ line! In 2-wire operation, connect Sense+ with P+
as close as possible to the strain gauge.
Caution: No further resistors are allowed with Quarterbridge coupling!

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2.2.5 STRAIN GAUGE: Halfbridge
When using strain gauges in halfbridge mode, supply voltage range is 0V to 10V with a maximum of
90mA . Sense+ line can be used if needed and has to be selected within LTTpro software.
Halfbridge pin assignement
You should look out for same cable length and same cable impedance on P+, P- and (optional)
Sense+. Signal quality will also be improved by twisting the cables.
Note: You should avoid to use coax cable for P+ and P- because cable cross-section of coax
cable for shield is different to those of center.
Sensors with 5 wires (including Sense-) : Keep the Sense- unattached. Caution: be aware of
the antenna effect on open wires!

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2.2.6 STRAIN GAUGE: Fullbridge
Supply voltage range is 0V .. 10V with a maximum of 90mA . Sense+ line can be used if needed and
has to be selected in LTTpro software.
Fullbridge pin assignement
Fullbridge will work with any bridge impedances. You should pay attention to matching cable length
and impedance of P+, P- and (optional) Sense+. Signal quality will also be improved by twisting the
cables, in addition to halfbridge mode you should also twist IN+ and IN- cables.
You should avoid to use coax cable for P+ and P- because cable cross-section of coax cable for
shield is different to those of center.
Sensors with 6 wires (including Sense-) : Keep the Sense- unattached. Caution: be aware of
the antenna effect on open wires!