YOKOGAWA ScopeCorder DL850E

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App-12

IM DL850E-01EN

Notes about Executing FFT Computation

Computation is normally performed on the sampled data in the acquisition memory. However, for waveforms

that have been acquired in envelope mode, computation is performed on the maximum and minimum values per

acquisition interval.

Appendix

Main Page

Default Chapter3
- Table of Contents3
1 Main Features9
- Vertical Axis9
- Horizontal Axis (Time Axis)10
- Trigger11
- Waveform Acquisition12
- Waveform Display14
- Waveform Computation and Analysis14
- Temperature/Voltage Input Module (720221)17
2 Vertical Axis18
- Input Settings18
- Voltage Measurement19
- Vertical Scale (SCALE Knob)20
- Waveform Vertical Position (Vertical POSITION Knob)22
- Input Coupling (Coupling)23
- Probe Attenuation and Current-To-Voltage Conversion Ratio (Probe)24
- Bandwidth (Bandwidth)25
- Zoom Method (V Scale)26
- Offset (Offset)28
- DC Offset Cancel (DC Offset Cancel)29
- Gain Adjustment (Gain)29
- Inverted Waveform Display (Invert)30
- Linear Scaling (Linear Scale)31
- RMS Measurement33
- Voltage Measurement (for the 16-CH Voltage Input Module)34
- Temperature Measurement37
- Temperature Measurement (for the 16-CH Temperature/Voltage Input Module)39
- Strain Measurement41
- About Shunt Calibration (Only on the 701271(STRAIN_DSUB))44
- Acceleration Measurement46
- Frequency Measurement48
- FV Setting (F/V Setup) - Frequency Measurement48
- Input Setup (Input Setup) - Frequency Measurement53
- Logic Measurement56
- CAN Bus Signal Monitoring (Applies to the DL850EV)58
- LIN Bus Signal Monitoring (Applies to the DL850EV)64
- Displaying the Menu for Configuring All Channels (ALL CH)68
- Digital Filter and Real Time Math (Optional)70
- Digital Filter and Delay (Filter/Delay Setup)70
- Real Time Math (Realtime Math)73
  - Arithmetic (S1+S2, S1−S2, S1*S2, and S1/S2)76
  - Differentiation (Diff(S1))76
  - Integration (Integ1(S1) and Integ2(S1))77
  - Angle of Rotation (Rotary Angle)77
  - Logic Signal to Analog Waveform Conversion (DA)79
  - Quartic Polynomial (Polynomial)80
  - RMS Value (RMS)80
  - Effective Power (Power)81
  - Effective Power Integration (Power Integ)81
  - Common Logarithm (Log1 and Log2)82
  - Square Root (Sqrt1 and Sqrt2)82
  - Cosine (Cos) and Sine (Sin)82
  - Arc Tangent (Atan)83
  - Electrical Angle (Electrical Angle)83
  - Knocking Filter (Knock Filter; Only on the DL850EV)84
  - Polynomial with a Coefficient (Poly-Add-Sub)84
  - Frequency (Frequency)85
  - Period (Period)85
  - Edge Count (Edge Count)86
  - Resolver (Resolver)86
  - IIR Filter (IIR Filter)87
  - Demodulation of the Pulse Width Modulated Signal (PWM)88
  - Reactive Power (Reactive Power(Q))88
  - CAN ID Detection (CAN ID)89
  - Torque (Torque)90
  - Notes Regarding Using the Digital Filter and Real Time Math91
3 Horizontal Axis94
- Time Axis Setting (TIME/DIV)94
4 Triggering97
- Trigger Mode (MODE)97
- Trigger Types (Type)98
- Signal Type and Trigger Type Combinations98
- Basic Trigger Settings98
- Simple Trigger (Simple)99
- Trigger Source (Source)99
- Trigger Level (Level)100
- Trigger Slope (Slope)101
- Trigger Hysteresis (Hysteresis)101
- Trigger Hold-Off (Hold Off)101
- Trigger Position (Position)102
- Trigger Delay (Delay)103
- A -> B(N) Trigger (Enhanced)104
- A Delay B Trigger (Enhanced)105
- Edge on a Trigger (Enhanced)106
- OR Trigger (Enhanced)107
- AND Trigger (Enhanced)108
- Period Trigger (Enhanced)109
- Pulse Width Trigger (Enhanced)110
- Wave Window Trigger (Enhanced)111
5 Waveform Acquisition114
- Record Length (Record Length)114
- Hard Disk Recording (HD Recordcondition; Optional)117
- Time Base (Time Base)118
- Dual Capture (DUAL CAPTURE)120
- Captured-Waveform Display Number (Select Number)121
- Waveform Acquisition (START/STOP)123
6 Display124
- Window Types (DISPLAY)124
- Display Format (Format)125
- Extra Window (Extra Window)125
- Grid (Graticule)125
- Turning the Scale Value Display on and off (Scale Value)126
- Waveform Arrangement, Color, and Display Gr. (Trace Setup)126
- Trace Label Display (Trace Label)127
- Level Indicator127
- Interpolation Method (Dot Connect)127
- Setting the Number of Data Points to Use for Waveform Display (Decimation)128
- Accumulation (Accumulate)128
- Manual Event (Manual Event)129
- Switching the Menu Area Display129
7 Displaying X-Y Waveforms130
- Turning the X-Y Window Display on and off (Display)130
- Eight Pairs of X-Y Waveforms (Setup)130
- Start Point and End Point (Start Point and End Point)130
- Pen Marker (Pen Marker)131
- Clearing Waveforms at Acquisition Start (Trace Clear on Start)131
- Display Ratio of the Main Window (Main Ratio)131
- Window Layout (Window Layout)131
- Combine Display (Combine Display)131
- Interpolation Method (Dot Connect)131
- Setting the Number of Data Points to Use for Waveform Display (Decimation)131
8 Zooming in on Waveforms132
- Zoom Window Display (Display)132
- Zoom Source Window (Zoom2 Source)132
- Zoom Factor (MAG Knob)133
- Position (Zoom POSITION Knob, Zoom1 Position, Zoom2 Position)133
- Display Ratio of the Main Window (Main Ratio)133
- Window Layout (Window Layout)133
- Display Format (Format Zoom1 and Format Zoom2)134
- Moving the Zoom Position to the Latest Position (Move Zoom1 to Front and Move Zoom2 to Front)134
- Auto Scroll (Auto Scroll)134
- Waveforms that Are Zoomed (Allocation)134
- Changing the Range of the Automated Measurement of Waveform Parameters (Fit Measure Range)134
9 Cursor Measurement135
- Window Selection (Select Window)135
- T-Y Waveforms135
- Horizontal Cursors (Horizontal) - T-Y Waveforms135
- Vertical Cursors (Vertical) - T-Y Waveforms136
- Horizontal and Vertical Cursors (H & V) - T-Y Waveforms138
- Marker Cursors (Marker) - T-Y Waveforms138
- Angle Cursors (Degree) - T-Y Waveforms140
- X-Y Waveforms141
- FFT Waveforms143
- Notes about Cursor Measurement145
10 Automated Measurement of Waveform Parameters146
- Mode Settings (Mode)146
- Automated Measurement of Waveform Parameters (ON)146
- Measurement Items (Measure Setup)146
- Setting the Delay (Delay Setup)149
- Measurement Time Period (Time Range1/Time Range2)150
- 1-Cycle Mode (1-Cycle Mode)151
- Notes about Automated Measurement of Waveform Parameters151
- Normal Statistical Processing (Statistics)152
- Cyclic Statistical Processing (Cycle Statistics)153
- Statistical Processing of History Waveforms (History Statistics)155
- Notes about Statistical Processing156
11 Computation157
- Turning Computation on and off (Mode)157
- Computation Waveform Selection (Select Math Trace)157
- Computation Settings (Math Setup)157
- Scaling Mode (Scaling Mode)160
- Upper and Lower Limits (Upper/Lower)160
- Start Point and End Point (Start Point/End Point)160
- User-Defined Computation (Optional)160
- Expression (Expression) - User-Defined160
- Averaging Settings (Average Setup) - User-Defined163
- FFT Settings (FFT Setup) - User-Defined165
- Filter Settings (Filter Setup) - User-Defined165
- Constant Settings (Constant Setup) - User-Defined166
- Notes about Computation166
12 Fft167
- Turning the FFT on and off (Display)167
- Analysis Source Waveform (Source)167
- Start Point and Number of FFT Points (Start Point and FFT Points)167
- Window Function (Window)168
- Vertical Scale (Vert. Scale Mode)168
- Center/Scale (Center/Sensitive)168
- Display Ratio of the Main Window (Main Ratio)169
- Window Layout (Window Layout)169
- Horizontal Scale (Horiz. Axis)169
- Unit (Unit)169
- Horizontal Zoom (Horiz. Scale)169
- Horizontal Range (Left/Right, Center/Span)169
- FFT Analysis with User-Defined Computation (Optional)170
- Notes about FFT Computation172
13 GO/NO-GO Determination173
- Mode (Mode)173
- Waveform Zone (Wave Zone)173
- Waveform Parameters (Parameter)176
- Notes about GO/NO-GO Determination177
14 Action178
- Mode (Mode)178
- Action (Action Setup)178
- Notes about Action179
15 Searching Waveforms180
- Search Type (Type)180
- Edge Search (Edge)181
- Event Search (Event)183
- Logic Pattern Search (Logic Pattern)183
- Time Search (Time)184
- Notes about Searching Waveforms184
16 Displaying and Searching History Waveforms185
- Display Mode (Display Mode)186
- Highlighting (Selected Record)186
- Display Range (Start and End Record)187
- List of History Waveforms (List)187
- History Waveform Search Mode (Search Mode)188
- Search Condition Settings for Zone Searching (Search Setup)188
- Search Condition Settings for Waveform Parameter Searching (Search Setup)189
- Search Execution (Execute Search)189
- Notes about Using the History Feature189
17 Power Math191
- Power Analysis (Power)191
- Harmonic Analysis (Harmonics)200
- Harmonic Analysis Window Setup (Harmonic Window Setup)202
18 Printing and Saving Screen Captures205
- Destination Type (Print To)205
- Printing from the Built-In Printer (Builtin; Option)205
- Printing from a Network Printer (Network)205
- Printing on a USB Printer (USB)206
- Saving Screen Captures to Files (File)207
- Printing or Saving a Screen Capture (PRINT)207
19 Saving and Loading Data208
- Storage Media You Can Save and Load from208
- Saving Data (Save)209
- Loading Data (Load)214
- File Operations (Utility)215
20 Ethernet Communication (Network)217
- Tcp/Ip (Tcp/Ip)218
- FTP Server (Ftp/Web Server)219
- Web Server (Ftp/Web Server)220
- Mail (Mail)221
- Network Printer (Net Print)222
- Network Drive (Net Drive)222
- Sntp (Sntp)223
21 Other Features224
- Auto Setup (Auto Setup)224
- Initializing Settings (Initialize)224
- Storing and Recalling Setup Data (Setup Data Store and Recall)225
- Calibration (CAL)225
- Power Integration Calibration (on Models with the /G5 Option)225
- Snapshot (SNAPSHOT)225
- Clear Trace (CLEAR TRACE)226
- Remote Control (Remote Ctrl)226
- System Configuration (System Configuration)227
- Environment Settings (Preference)230
- Self-Test (Selftest)233
- Overview (Overview)234
- Key Lock (KEY PROTECT)234
- Num Lock234
Appendix235
- Appendix 1 How to Calculate the Area of a Waveform235
- Appendix 2 User-Defined Computation (Optional)237
  - FFT Function - User-Defined241
- Appendix 3 Fundamental Equations for Defining Strain247
- Appendix 4 Shunt Calibration of the Strain Module248
  - Shunt Calibration Procedure249
- Appendix 7 TCP and UDP Port Numbers260
- Appendix 8 Using Data Files (WDF Files)261

YOKOGAWA ScopeCorder DL850E - Page 246

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