LTR11 Universal ADC module with sequential commutation of input channels

Universal ADC module with sequential commutation of input channels
  • Input channels: 16 differential or 32 with "common ground"
  • The synchronization signals of ADC conversion frequency and the start of the acquisition can be internal or external (programmable) 
  • Built-in software-controlled breakage monitoring function (for sensors with low-impedance output) or short-circuit of input lines

Universal ADC module is designed for building multi-channel data acquisition systems with a fairly low average cost of the measuring channel.

Switching of input channels and selection of amplitude ranges is carried out programmatically. At the multichannel mode LTR11 is designed to connect to only low-impedance sources of signal, at single-channel mode - there are no restrictions.

Connections with "common ground" or differential means the presence of a common point (common measuring ground) for measuring channels of one module.

Number of channels 16 differential or 32 with "common ground"
Resolution 14 bits
Input signal measuring subranges ±10 V, ±2,5 V, ±0,6 V, ±0,15 V
Maximum sampling rate 400 kHz (total for all channels polled)
Input resistance with single-channel input, not less than 10 MOhm when ON
1 kOhm when OFF
Maximum permissible voltages on analog inputs (input protection) ±27 V when ON
±16 V when OFF
Effective resolution calculated by the ratio of signal/(noise + harmonics), 1 kHz signal frequency, 100 kHz ADC conversion frequency (at measurement subbands) 12.8 bits (±10 V, ±2.5 V)
12.5 bits (±0.625 V)
12.0 bits (±0.15 V)
Limits of the permissible basic reduced (to the final value of the subband) error of measuring the DC voltage ± 0.05% (±10 V and ±2.5 V)
± 0.1% (±0.6 V)
± 0.5% (±0.15 V)
In-phase 50 Hz rejection coefficient in differential mode, not less than 70 dB
Integral nonlinearity of the transformation Max. ±1,5 LSB
Differential nonlinearity of the transformation Max. from –1 to +1,5 LSB
Inter-channel interference of a sinusoidal signal of 1 kHz at a range of ±10V, with an ADC conversion frequency of 400 kHz and a signal sources internal resistance of 50 Ohm -92 dB
Sync modes Internal or external from the inputs: 
  • START - synchronization of data acquisition start;
    SYN - external conversion frequency of ADC
Input type Logical TTL/CMOS input, 
"Frontal" or "Decay" triggering
is set programmatically
Galvanic isolation
See the mian features of LTR modules

External signals connector

Разъём LTR11

Hardware description, assignment and connection of signals is given in the User's Guide.


  • ltr11api.pdf (filesize: 553 183 bytes, date: 13.01.2010)

    LTR11 module. Programmer's Guide.

  • ltrapi_en.pdf (filesize: 604 618 bytes, date: 15.02.2018)

    Ltrapi basic library. Programmer's Guide.

  • ltr_cross_sdk_en.pdf (filesize: 551 553 bytes, date: 13.02.2018)

    Description of the software for Windows, Linux, FreeBSD and QNX.

  • ltr_en.pdf (filesize: 11 066 427 bytes, date: 25.12.2017)

    LTR modular DAQ system. User's Guide (revision 3.1.0).

    • General characteristics and principles of construction
    • Working with LTR crate
    • Overview of LTR crate architecture
    • LTR11 ADC module
    • LTR212 (M) strain measurements modules
    • LTR27 measuring module
    • LTR41, LTR42, LTR43 digital I/O and synchronization modules
    • LTR51 frequency meter module
    • LTR22 ADC module
    • LTR24 (-1, -2) ADC modules
    • LTR25 ADC module
    • LTR34 DAC module
    • LTR35 DAC module
    • LTR114 ADC module
    • LTR210 ADC module
    • LTR00 Dummy module
    • Low-level programming of LTR-EU crate
    • Specification
  • ltr_soft_getting_started_en.pdf (filesize: 269 974 bytes, date: 13.02.2018)

    Starting to work with DAQ system LTR. Questions about the software.

LGraph2 software package

  • (filesize: 26 786 707 bytes, date: 11.10.2021)

    LGraph2 is a free multi-channel data recorder for Windows. Version 2.35.20 provides the possibility of simultaneous data visualization and recording from the ADCs: L-502, L-780M, L-783, L-791, E-502, E14-140, E14-140M, E14-440, E-154, E20-10, LTR11, LTR114, LTR27, LTR212, LTR216, LTR22, LTR24, LTR25, LTR51. It requires an updated version of the LComp driver (from version 01.04.2010) and ltrserver (no lower than

Software for Windows

  • lcard-opc-setup.exe (filesize: 12 440 520 bytes, date: 09.04.2019)

    OPC DA Server for L Card data acquisition modules and LTR crate system. Version 1.0.10.

  • lcomp.exe (filesize: 6 342 216 bytes, date: 12.05.2021)

    Beta version. LCOMP library for Windows XP/Vista/Win7/Win8/Win10 32 and 64-bit versions with drivers. The installer and drivers are digitally signed. The library is built on the basis of modern WDM-drivers rewritten on WDF. It includes the WDM driver itself for L-CARD hardware, the DLL library with source code, programming examples, electronic description, etc. The LCOMP library provides support for almost the entire range of products: PCI boards, USB modules. ISA support is excluded.

    The library includes “L-Graph I” software. L-Graph I supports the following devices: L-1450, L-761, L-780, L-783, L-791, E14-140, E-154 and E14-440. Files recorded by L-Graph I can also be read and processed using the demo-version of PowerGraph v.3.X.

  • ltrd-setup.exe (filesize: 1 467 408 bytes, date: 19.08.2021)

    The ltrd service. Version Provides communication with LTR crates. It is a replacement for the LTRserver software while maintaining the compatibility of the program interface. ltrd is designed for the same purpose as LTRserver, but it is a service that runs when the system is started. The graphical interface to the service is provided by a separate LTR Manager program.

    Attention! Only one of the programs ltrd or LTRserver can work at a time.

  • ltrdll.exe (filesize: 1 328 600 bytes, date: 30.11.2021)

    Libraries for working with LTR crates and modules. Version 1.32.30.

  • ltrmanager_setup.exe (filesize: 9 751 808 bytes, date: 04.05.2021)

    LTR Manager software. Version 1.5.2. Graphical interface to the ltrd service. Provides an interface similar to the LTRserver interface when working through the ltrd service.


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