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ONOSOKKI DS-2000 Series Manual

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DS-2000 Series
Vibration Measurement
ONO SOKKI CO., LTD.

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Summary of Contents for ONOSOKKI DS-2000 Series

  • Page 1 DS-2000 Series Vibration Measurement ONO SOKKI CO., LTD.
  • Page 2 Contents 1. Flow Chart to Measurement 2. Device Connections 3. FFT Analyzer Setup 4. Starting Measurement 5. Data Processing 1. Flow Chart to Measurement * The following explains procedures for measuring vibration using an "accelerometer." Accelerometer Connect an accelerometer to the DS-2000. connection Input source setup Set the type and output sensitivity...
  • Page 3 2. Device Connections 2-1 Device Connections Connect the DS main unit and the PC as follows. Personal computer (laptop) DS-2000 rear panel ONOLINK II → PCMCIA Key protector (USB or parallel) 100VAC 100VAC...
  • Page 4 2-2 Connection with Sensor Connect an "accelerometer" to the FFT analyzer. The accelerometer comes in two types: built-in amplifier type and charge output type. Basically, connect each sensor with the DS- 2000 as follows: The NP-3000 series accelerometer can be directly input through a BNC conversion adapter.
  • Page 5 3. FFT Analyzer Setup 3-1 Input Source Setup Set the sensitivity, operating conditions, etc. of the sensor connected to the FFT analyzer. The following shows a case where a piezoelectric accelerometer based on the following sensitivity is used. ① ② Double-click the icon of DS-0221FFT to start the application.
  • Page 6 Select the Input menu and then select Voltage Range Set. Click [▼] on the right of the Input Source box and select SENSOR (2.0mA). (Refer to (2) in the sensitivity table.) Click OK to apply the settings. 3-2 Engineering Unit Setup Set the sensitivity of the sensor in order to directly read amplitude values using engineering unit.

  • Page 7: Starting Measurement

    4. Starting Measurement 4-1 Voltage Range and Frequency Range Setup First, observe the vibration waveform. Since the screen displays power spectrums of CH1 and CH2 with the initial setup, select time-axis display of a channel subjected to signal input. Click the comment area to activate Select Disp.
  • Page 8 Set the voltage sensitivity while monitoring the magnitude of the input signal. Make setting so that the waveform fits into the time-axis display screen. Click the Input menu and select Voltage Range (in the same manner as 3-1, "Input Source Setup) or select a button in the tool bar.

  • Page 9: Cursor Function

    4-2 Cursor Function Read the frequency and the amplitude of power spectrum using the cursor function. With the initial setup, the peak search function is selected and therefore the maximum amplitude is automatically searched for. Further, change the Y-axis scale as required. Select Search.
  • Page 10 Cursor values are displayed at the bottom of display screen. Can be set also from the tool bar. * Menu can be easily opened by right-clicking on the screen. 4-3 Frequency Differential/Integral At the time of vibration measurement, the vibration quantity is handled as acceleration, velocity, and displacement depending on the frequency to be measured.
  • Page 11 Perform frequency integral. Activate the spectrum screen, click the Analysis menu, and select Frequency jw. Displacement → Velocity Displacement → Acceleration Acceleration → Velocity Acceleration → Displacement Select an engineering unit. Perform single integral to convert acceleration to velocity.
  • Page 12 5. Processing and Saving Data 5-1 Averaging Averaging is performed in order to improve data accuracy. Here, summation averaging of a general power spectrum is performed. At the time of averaging, it is necessary to perform overlap processing according to the frequency range. Overlap of data occurs if the signal capture time is longer than the FFT operation time.
  • Page 13 Select Sampling from the Input menu. The amount of overlap can be set in 25% steps or user-defined. * When the amount of overlap is set to 0%, new data is averaged. However, if the frequency range is very low, processing takes long time. In this case, the number of averaging can be increased or average time can be set.

  • Page 14: Saving Data

    Perform averaging using tool buttons. Performs summation averaging 10 times after overlap processing. 5-2 Saving Data Save measurement results. All data currently displayed on the screen can be saved simultaneously, or only specified data can be saved. Procedures for saving specified data are shown below.
  • Page 15 * When you click the Add button, the dialog shown at right appears. Select specified data. Specify a channel in relation to data to be saved. Set a file name. Click OK to apply the settings. 5-3 Copy Function Measurement data can be temporarily put in the clipboard. The data in the clipboard can be easily pasted to other applications without saving.
  • Page 16 CAUTION: 1. The copyright of this procedure manual is reserved by Ono Sokki Co., Ltd. 2. Duplication without prior permission is prohibited. 3. This procedure manual explains general measurement procedures. Ono Sokki assumes no responsibility for data obtained through a specific operation performed by the customer.