H-51X Submodules installed into LTR51 - frequency meters

Submodules installed into LTR51 - frequency meters
  • 2 channels
  • Installing up to 8 daughterboards per LTR51 module
  • Each channel has its own comparator setup system

H-51x submodules with the LTR51 module allow to create complete customized solutions for measuring the frequency parameters of signals.

Designed to work as part of LTR51 modules

The possibility of simultaneous installation of different types of submodules provides flexible configuration by the number and type of measuring channels.

Each channel has its own customizable scheme for selecting (comparing) the input signal.

Н-51FH     frequency or period meter of complex form signals
Number of channels 2
Frequency bandwidth of the analog input path (with an output signal source impedance of not more than 100 Ohms) 0...29 kHz at -1 dB level
0...178 kHz at -3 dB level
H-51FL     frequency or period meter of complex form signals
Number of channels 2
Frequency bandwidth of the analog input path (with an output signal source impedance of not more than 100 Ohms) 0...5.9 kHz at -1 dB level 
0...36 kHz at -3 dB level
  • H-51FH
    Frequency meter: 2 channels, 0...125 kHz, wide-band input filter
  • H-51FL
    Frequency meter: 2 channels, 0...15 kHz, narrow-band input filter


  • ltr51api.pdf (filesize: 790 817 bytes, date: 21.03.2007)

    LTR51 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.

Software for Windows

  • 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.

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

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


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Fax: +7 (495) 785-95-14

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Technical support: en@lcard.ru

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Moscow 117105
Russian Federation

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