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dsa:fft [2024/05/21 15:18] – [Input Channels] dsain_go-ci.comdsa:fft [2024/07/17 19:39] (current) – [Input Channels] dsain_go-ci.com
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 Follow the guided steps below on how to set-up a FFT Analysis in EDM to use with Spider hardware.\\ Follow the guided steps below on how to set-up a FFT Analysis in EDM to use with Spider hardware.\\
 ===== Create Test ===== ===== Create Test =====
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 +<slider :dsa:pasted:20240521-142436.png>
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 In EDM, select to create a new test. From the New Test Wizard, select the **FFT Analysis** test type.\\ In EDM, select to create a new test. From the New Test Wizard, select the **FFT Analysis** test type.\\
-{{:dsa:pasted:20240521-142436.png}}+
 Next, give the test a name and description.\\ Next, give the test a name and description.\\
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 Finally, select the signal types that are wanted. You can select more than one signal type. Additionally, there Time History Stats can be selected to be calculated as well. You are **unable** to add more signal types to be computed once the test is created. Press **Finish** to create the test.\\ Finally, select the signal types that are wanted. You can select more than one signal type. Additionally, there Time History Stats can be selected to be calculated as well. You are **unable** to add more signal types to be computed once the test is created. Press **Finish** to create the test.\\
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 ===== Test Configuration ===== ===== Test Configuration =====
 Before testing, the **Analysis Parameters** must be configured to ensure all the data is properly measured.\\ Before testing, the **Analysis Parameters** must be configured to ensure all the data is properly measured.\\
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 {{:dsa:pasted:20240521-143807.png}}\\ {{:dsa:pasted:20240521-143807.png}}\\
  
-At the bottom of the window, the *Test Summary** can be found. This displays important stats about the analysis such as the Block Time, Sampling Rate, and Frequency Resolution (dF).\\+At the bottom of the window, the **Test Summary** can be found. This displays important stats about the analysis such as the Block Time, Sampling Rate, and Frequency Resolution (dF).\\
 {{:dsa:pasted:20240521-144040.png}} {{:dsa:pasted:20240521-144040.png}}
  
 ===== Input Channels ===== ===== Input Channels =====
-The input channels will now need to be set up. All sensors will to be properly configured before testing. The Input Channels menu can be found through **Setup → Input Channels**.\\ 
  
-**Measurement Quantity**\\ +The input channels will now need to be set up. All sensors will to be properly configured before testing. The Input Channels menu can be found through **Setup → Input Channels**.\\  {{ :dsa:pasted:20240521-152103.png }}\\  
-Defines the physical unit that will be measured by the sensor connected to the channel.\\+
  
-**Sensitivity**\\ +**Measurement Quantity**\\  Defines the physical unit that will be measured by the sensor connected to the channel.\\ 
-Sets the proportionality factor for the measurement (millivolts per engineering unit) given as a parameter of the sensor.\\+**Sensitivity**\\  Sets the proportionality factor for the measurement (millivolts per engineering unit) given as a parameter of the sensor.\\
  
-**Input Mode** +**Input Mode**\\  There are six modes in which the inputs can operate:\\
-There are six modes in which the inputs can operate:\\+
  
 DC-Differential- In the DC-Differential mode, neither of the input connections is referenced to the local ground. The input is taken as the potential difference between the two input terminals, and any potential in common with both terminals is canceled out. The Common Mode Voltage (CMV) will be rejected as long as the overall input voltage level does not saturate the input gain stage. Beware that very high CMV will cause clipping and may damage the input circuitry. Signals with a nonzero mean (DC component) can be measured in this mode.\\ DC-Differential- In the DC-Differential mode, neither of the input connections is referenced to the local ground. The input is taken as the potential difference between the two input terminals, and any potential in common with both terminals is canceled out. The Common Mode Voltage (CMV) will be rejected as long as the overall input voltage level does not saturate the input gain stage. Beware that very high CMV will cause clipping and may damage the input circuitry. Signals with a nonzero mean (DC component) can be measured in this mode.\\
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 Charge- Some sensors provide a high-impedance charge output. Usually, these are high-sensitivity piezoelectric units that lack a built-in voltage mode amplifier (i.e. IEPE), allowing them to be used in high-temperature environments. The Spider-81 front-end module has a built-in charge amplifier that allows the system to read the output of these sensors.\\ Charge- Some sensors provide a high-impedance charge output. Usually, these are high-sensitivity piezoelectric units that lack a built-in voltage mode amplifier (i.e. IEPE), allowing them to be used in high-temperature environments. The Spider-81 front-end module has a built-in charge amplifier that allows the system to read the output of these sensors.\\
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 +**High-Pass Filter**\\
 +Ability to set a digital high-pass filter for specific channels.\\
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 +**Integration/Differentiation** Channels can be set up to be integrated or differentiated. For example, the velocity data can be integrated from an accelerometer. **NOTE**: if this is selected, the original quantity of data will not be recorded (Ex. If an accelerometer is integrated, there will only be velocity data, no acceleration data.)\\
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