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ENDEVCO 2775C Instruction Manual

Pe/iepe signal conditioner
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Model 2775C PE/IEPE Signal Conditioner
IM2775C
Instruction manual
IM2775C Rev B
Date 1/31/2024

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Summary of Contents for ENDEVCO 2775C

  • Page 1 Model 2775C PE/IEPE Signal Conditioner IM2775C Instruction manual IM2775C Rev B Date 1/31/2024...

  • Page 2: Table Of Contents

    Table of Contents Table of Contents ....................................... 2 Product Description ..................................4 User Interface ....................................5 Front Panel ....................................5 Rear Panel....................................6 Internal (filter and integrator control) ............................. 7 Menu Interface ..................................... 8 Standard Functions Menu ................................9 Input ....................................... 10 Mode ......................................
  • Page 3 Mode Tab ....................................19 Sensor Tab ....................................19 Filters Tab ....................................21 Gains Tab ....................................22 Output Tab ..................................... 23 Remote Tab .................................... 24 Settings page ..................................25 Internal Switches ..................................26 T-Junction Calibration ................................. 27 Test Procedure ..................................27 Safety ......................................

  • Page 4: Product Description

    0 to 10,000 and a frequency response bandwidth of 120 kHz (-3 dB corner). The 2775C includes AC, DC, and servo outputs and operates from a regulated 12V DC, 12 W power source, with selectable ground isolation for cleaner data collection.

  • Page 5: User Interface

    2.0 User Interface Front Panel The 2775C front panel provides user control to modify instrument settings. See Figure 1: Front panel. On/Off Switch ENT Button Up, down, left, right navigation arrows LCD Screen LED Status Indicators Figure 1: Front panel In addition to controls, there are three fault indicators (red LEDs) located on the front panel.

  • Page 6: Rear Panel

    • RS-232 port - An RS-232 serial interface is available through an RJ-11 connector located on the rear panel. Endevco benchtop controller software 35933A is available as an optional accessory for the 2775C. See IM35933A for instructions on its use.

  • Page 7: Internal (Filter And Integrator Control)

    The user can set low pass and high pass filter corner frequencies, as well as integration functions, by accessing switches inside the 2775C. Instructions for access are below. Detailed instructions on how to use the internal switches are found in Section 7.0.

  • Page 8: Menu Interface

    DOWN or LEFT buttons. To change the value for this type of function, simply use UP, DOWN, LEFT, or RIGHT to scroll to the desired option, and press ENT. The 2775C will return to View mode for that function, and the bottom row will display the value for the function.

  • Page 9: Standard Functions Menu

    Functions”. The Standard Functions include more commonly used functions, while Advanced Functions include settings that are not changed regularly. The UP or DOWN arrow buttons will exit the “RMS/DC Output” state. The 2775C is normally in the Standard Functions Menu. Press the UP or DOWN arrow buttons to scroll through the options.

  • Page 10: Input

    IEPE current excitation is disabled during this mode of operation. Example of operation: • Connect a signal generator or the Endevco model 4830B to the “ExtCal” BNC connector on the rear panel • Change the value of the Mode function to “ExtCal”.

  • Page 11: Sensor Type

    • Verify the AC, Servo, and DC outputs are at full scale. • If using the 4830B, use the 2775C’s sensor input since the 4830B can simulate either a charge-mode or IEPE accelerometer. • Check the calibration connecting to the AC output of the 2775C to a precision, true RMS AC voltmeter.

  • Page 12: Servo (Servo Output Scaling) [Mv/Eu]

    Description: Allows the user to enter the sensitivity of the transducer in mV/EU for Voltage input, or pC/EU for Charge input. The Model 2775C automatically sets the gain level to achieve the required output scaling (FSO/FSI). Options: • Range: 0.001 to 9999.000 Servo (Servo Output Scaling) [mV/EU] Description: This function provides a DC output proportional to the vibration output level.

  • Page 13: Output Filter

    “A/D Integ”: The accelerometer’s signal is integrated to displacement. Emulate 2775B Description: When the 2775C is in 2775B Emulation Mode, the 2775C may be operated using the same RS-232 commands as used in the 2775B. This allows the 2775C to be backwards-compatible with existing test systems that already use the 2775B.

  • Page 14: Ac Fso (Ac Full Scale Output) [V]

    RS-232 as “2775C Rev A” in this mode. • “Yes”: The 2775C may be operated via RS-232 using the 2775B command list. The 2775C will report its identity via RS-232 as “2775B Rev C” in this mode.

  • Page 15: Advanced Functions Menu

    LPF Switches Description: This function has a view only mode, and is not editable from the Front Panel. This function displays the current setting of the custom Low Pass Filter determined by the internal 2775C hardware and switch positions. HPF Switches Description: This function has a view only mode, and is not editable from the Front Panel.

  • Page 16: Rs-232 Baud Rate

    RS-232 Baud Rate Description: Sets the baud rate of the RS-232 interface. Any of the arrow buttons may be used to select the baud rate. Unit Address Description: Sets the address of the 2775C unit. Options: • Range: 1-20, inclusive IP Address Description: Sets the IP address of the unit.
  • Page 17 Description: During the factory calibration process, it is necessary to adjust various levels, such as gain, in the 2775C circuits to ensure the 2775C is in compliance with an external standard. The original calibration constants are stored in the 2775C memory and are also included on the calibration certificate. In Figure 13: Calibration Constant screen, it took a calibration constant of 0.973 to bring the AC output within the required specification.

  • Page 18: Factory Restore

    Figure 14: Calibration certificate Options: • Range: 0.800 to 1.200 Factory Restore Description: Allows the user to return all the user settings to the factory settings. Options: • Yes, No IM2775C Rev B Date 1/31/2024...

  • Page 19: Web Interface

    6.0 Web Interface The 2775C may be controlled via its web interface. The factory web server IP address is 192.168.1.100. The factory web page address is http://192.168.1.100/. The IP address may be viewed and changed using the front panel. For best performance, use the Google Chromium browser.
  • Page 20 Figure 16: Sensor tab IM2775C Rev B Date 1/31/2024...

  • Page 21: Filters Tab

    Filters Tab The Filters tab is used to control the signal path filters. See Figure 17: Filters tab. The Switches section shows the configuration of the internal switches. See Internal Switches section. The Settings section controls the front-end high-pass filter (HPF) and the filter/integrator section. Figure 17: Filters tab IM2775C Rev B Date 1/31/2024...

  • Page 22: Gains Tab

    Gains Tab The Gains tab shows the internal gain stages and their current values. See Figure 18: Gains tab. Gains are computed automatically whenever sensitivity, full-scale input (FSI) or full-scale-output (FSO) are changed. This tab allows the user to override the automatic gain processing.

  • Page 23: Output Tab

    Output Tab The Output tab controls the full-scale output of the unit. See Figure 19: Output tab. Note that changing these settings will change the system gain. Figure 19: Output tab IM2775C Rev B Date 1/31/2024...

  • Page 24: Remote Tab

    Remote Tab The Remote tab displays the remote control configuration items. See Figure 20: Remote tab. The following remote control data items may be changed: the unit address, the Ethernet IP address, netmask and gateway, and the RS232 baud rate. Figure 20: Remote tab IM2775C Rev B Date 1/31/2024...

  • Page 25: Settings Page

    Settings page Click on the gear icon to display the system settings page. See Figure 21: Settings page. The settings page shows the calibration constants and allows the user to return the unit to its factory settings. Changing a factory calibration constant voids the warranty. Restoring the factory settings will change the IP address back to 192.168.1.100, which may cause the web page to become unresponsive.

  • Page 26: Internal Switches

    7.0 Internal Switches Internal switches are provided to allow the user to configure the signal conditioner to the test requirements. See Figure 3: Filter and integrator switches for the location of these switches. Switching to the “ON” position will activate the appropriate circuit to perform the desired function, e.g.

  • Page 27: T-Junction Calibration

    The mounting stud is an insulated type since the accelerometer and 2775C grounds must be isolated. The calibration voltage is provided by an external signal generator that is connected to the 2775C’s ExtCal input.
  • Page 28 Parameters for Calibration: Some additional calculations should be made if the T-Junction is being used to conduct an accurate calibration check. Since the 2775C is a charge amplifier, the calibration resistance, usually the output resistance of the external signal generator. R must meet the following: ��������...

  • Page 29: Safety

    Ecal = Calibration voltage sensitivity in peak volts/peak g. Rcal = Calibration resistance, the output resistance of the signal generator. Prior to using the T-Junction calibration feature, it is recommended that the user review Endevco Technical Paper TP216, available on the Endevco web site.

  • Page 30: Do Not Substitute Parts Or Modify The Instrument

    Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument. 10.0 Repairs and Calibration For repair or replacement of a defective instrument, or calibration, contact Endevco and obtain an RMA number prior to returning the instrument. IM2775C Rev B...

  • Page 31: Appendix A: Using High Temperature Charge-Mode Accelerometers

    Appendix A: Using high temperature charge-mode accelerometers The 2775C has a minimum source resistance of 10 MΩ, which is capable of supporting most accelerometers. When using accelerometers at high temperatures, the resistance of the sensing material drops below the minimum source (input) resistance of the 2775C.

  • Page 32: Appendix B: Rs-232 Remote Control Application Program Interface (Api)

    • The model is 512 for the 2775B, and 768 for the 2775C. • The unit address is set from the front panel of the 2775C or from the web pages. The range is 1-255. The broadcast address is 0.
  • Page 33 A NAK response has the following format: <unit_address> 0 13;<reason> <terminator> Malformed commands are ignored. Well-formed commands will generate a NAK response if any of the reasons described in Table 2 - NAK Reasons are true. Reason Description Command unsupported Missing a data field Bad checksum Data field out of range...
  • Page 34 1 0 12;\n SET CAL CONSTANTS (1) Command <model + unit_address> 1 1; <K1> <K2> <K3> <K4> <K5> <K6> <K7> <K8> <K9> <K10> <K11> <K12> <K13> <K14> <K15> <K16> <checksum><terminator> where the K values are the internal cal constants multiplied by 1000. For example, “1012” would correspond to an internal value of 1.012.
  • Page 35 Response 1 0 2;0 1000 1000 3000 2000 1000 0 1000 \n GET CAL CONSTANTS (3) Command <model + unit_address> 1 3; <checksum><terminator> Response <model + unit_address> 1 3; <K1> <K2> <K3> <K4> <K5> <K6> <K7> <K8> <K9> <K10> <K11> <K12> <K13> <K14>...
  • Page 36 Response 1 0 9;2775C REV A \n GET LPF (10) This command is used for 2775B emulation and is deprecated for 2775C. Command <model + unit_address> 1 10; <checksum><terminator> Response <unit_address> 0 10; <terminator> Example Command 769 1 10;179\n Response 1 0 10;...
  • Page 37 Table 3 - Error bitmap For example, an isolation error (1) and an overload condition (4) would generate an error code of 5. 0 indicates no error. Example Command 769 1 11;180\n Response 1 0 11;0 \n GET MAC ADDRESS (20) Command <model + unit_address>...
  • Page 38 Response If no errors occur, an ACK is returned: <unit_address> 0 21;<serial number> <terminator> Example Command 769 1 21;181\n Response 1 0 21;EN0000126 \n IM2775C Rev B Date 1/31/2024...

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