IS200VAMAH1A - Acoustic Monitoring Board

IS200VAMAH1A - Acoustic Monitoring Board IS200VAMAH1A - Acoustic Monitoring Board

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Part No.: IS200VAMAH1A
Manufacturer: General Electric
Series: Mark VI
Technology: Surface mount
FFT record length: 8192
Number of Transducers: Two
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS200VAMAH1A is an Turbine Acoustic Monitoring Board developed by GE. It is a part of Mark VI control system. It monitors acoustic or pressure waves in the turbine combustion chamber. These inputs are wired to the DIN-rail mounted DDPT board, which supports the simplex mode. The DDPT board connects to VAMA through the J3 connector on the VME rack where VAMA is located. To ensure safety in hazardous environments with gases, the VAMA/DDPT system meets the environment rating for Class I, Division 2, and provides signal suppression at all points of entry or exit.


  • Each cable used in the setup is equipped with a unique ID chip, enabling efficient identification and management of connections. The component offers a two-point calibration system based on a reference offset and gain signal. This calibration ensures accurate and reliable measurements of pressure oscillations and acoustic waves in the gas turbine combustion chamber.
  • Gas turbine combustion chambers can experience pressure oscillations that result in noise within the audible hearing range. The H1A version of the VAMA board incorporates signal conditioning and specialized software, enabling the turbine control system to monitor the pressure and acoustic waves. This is achieved by reading the conditioned signals from a dynamic pressure transducer.
  • The board provides two dedicated channels to read the pressure and acoustic wave signals from third-party equipment, specifically Vibro-Meter or Bently-Nevada. These channels ensure seamless integration with these renowned equipment manufacturers, enhancing the overall functionality and flexibility of the system.
  • To process the incoming signals effectively, the board offers two dedicated signal conditioning paths. These paths serve to remove the direct current (DC) component of the signal, modify the gain to optimize sensitivity, and provide an eighth-order or better low-pass filter to prevent aliasing. By removing the DC component and applying the appropriate filtering, it delivers accurate and reliable data for precise monitoring and analysis.


  • Power Down the VME Processor Rack: Begin by powering down the VME processor rack. This is a critical safety measure to avoid any electrical hazards during the installation process. Ensure that the rack is completely powered off and disconnected from the power source before proceeding.
  • Slide in the Board: Next, carefully slide the V-type board into the designated slot on the VME rack. Align the board's edge connectors with the corresponding slots in the rack. Be cautious and avoid applying excessive force during this step to prevent any damage to the connectors or the board.
  • Seat the Edge Connectors: Once the board is inserted into the slot, use your hands to push the top and bottom levers inward. This action will securely seat the board's edge connectors into the slots, ensuring proper electrical contact. Ensure that the board fits snugly and evenly in the rack without any misalignment.
  • Tighten Captive Screws on the Front Panel: After properly seating the board's edge connectors, locate the captive screws on the top and bottom of the front panel of the board. Use a suitable screwdriver to tighten these screws, but only to a reasonable level to hold the board firmly in place. Avoid overtightening the screws to prevent damage to the board or the rack.
  • Enhancing Front Ground Integrity: The captive screws on the front panel not only hold the board in place but also contribute to enhancing the front ground integrity. This helps maintain proper grounding and electrical stability for the board and the overall system.
  • Avoid Using Screws to Seat the Board: The captive screws should not be used to force or push the board into place. Their primary purpose is to secure the board once it is correctly seated. Using the screws to actually seat the board may lead to misalignment and potential damage to the connectors or the board itself.
  • Power Up the VME Processor Rack: Finally, after completing the installation and ensuring that the board is securely seated and properly fixed, power up the VME processor rack. Verify that the board is functioning correctly and check for any error messages or abnormal behavior during the startup process.

World of Controls has the most comprehensive collection of GE Mark VI components. Please contact WOC as soon as possible if you require any extra information.


Frequently Asked Questions


What is IS200VAMAH1A?
It is an Turbine Acoustic Monitoring Board developed by GE

What type of output does the dynamic pressure transducer produce?
The dynamic pressure transducer (Vibro-Meter CP216 or CP231) produces a pico-coulomb output, which is further conditioned for monitoring purposes.

What is the purpose of the charge amplifier (Vibro-Meter IPC 704)?
The charge amplifier serves to condition the pico-coulomb output from the dynamic pressure transducer, converting it into a current output representing approximately 125 micro A per psi (pounds per square inch).

What type of signal does the Vibro-Meter GSI unit output, and how is it represented?
The Vibro-Meter GSI unit outputs an AC signal representing the dynamic pressure, with an approximate peak voltage of 2 V. This signal rides on top of a DC bias voltage of approximately 7 V.