DI-770 Oscilloscope provides five virtual instruments in one

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DI-770 and WINDAQ/Scope Manual 24.80 Hz 22.09 Hz 17.84 Hz 31.25 Hz 27.84 Hz 35.1 Hz 39.4 Hz 35.1 Hz 44.2 Hz 49.6 Hz 44.2 Hz 55.7 Hz 62.5 Hz 55.7 Hz 70.2 Hz 78.7 Hz 70.2 Hz 88.4 Hz 99.2 Hz 88.4 Hz 111 Hz 125 Hz 111 Hz 140 Hz 157 Hz 140 Hz 177 Hz 198 Hz 177 Hz 223 Hz 250 Hz 223 Hz 280 Hz 315 Hz 280 Hz 354 Hz 397 Hz 354 Hz 445 Hz 500 Hz 445 Hz 561 Hz 630 Hz 561 Hz 707 Hz 794 Hz 707 Hz 891 Hz 1.00 kHz 891 Hz 1.12 kHz 1.26 kHz 1.12 kHz 1.41 kHz 1.59 kHz 1.41 kHz 1.78 kHz 2.00 kHz 1.78 kHz 2.24 kHz 2.52 kHz 2.24 kHz 2.82 kHz 3.17 kHz 2.82 kHz 3.56 kHz 4.00 kHz 3.56 kHz 4.49 kHz 5.04 kHz 4.49 kHz 5.66 kHz 6.35 kHz 5.66 kHz 7.13 kHz 8.00 kHz 7.13 kHz 8.98 kHz 10.1 kHz 8.98 kHz 11.3 kHz 12.7 kHz 11.3 kHz 14.3 kHz 16.0 kHz 14.3 kHz 17.9 kHz 20.2 kHz 17.9 kHz 22.6 kHz The Spectrum Analyzer 64
DI-770 and WINDAQ/Scope Manual Each third octave is displayed with the same width on the display. This mode requires that the sampling frequency is about 44 kHz and the record length is at least 4096 spectral components. When this display mode is switched on, the sampling frequency and the record length can no longer be set. Note: When the spectrum analyzer is set to Hold and the frequency axis is set to octaves or third octaves, the signal will not match with the axis and the grid until a new measurement is taken. Setting the frequency range The frequency range can be set in two ways: using the menu of by means of special function keys. The frequency range is determined fully on the sample frequency: the frequency range is half of the sample frequency. To change the Frequency range using the menu, enter the Frequency axis menu and select the Frequency range item. A new menu will appear with all possible frequency range settings. The Frequency axis menu can also be entered by pressing the right mouse button over one of the frequency axis controls or read outs. The last item in the menu is a user defined setting. Activating this item will bring up a dialog box in which a self defined frequency range (within the instrument hardware limitations) can be entered. Due to the way the sample frequency is generated in the hardware, not all frequencies and thus not all frequency ranges can be generated. If an invalid frequency range is entered, the closest valid frequency range will be generated. The following keys can be used to change the frequency range: Set the frequency range one step smaller Set the frequency range one step larger Setting the spectrum record length The spectrum analyzer takes a number of samples to determine the frequency spectrum of the input signal. This number has to be a power of 2. After the FFT calculation, a spectrum with half of that number spectral components is obtained. This number of spectral components is called the Record length. To change the record length, two ways are available: by means of a menu or by means of function keys. To change the record length using the menu, enter the Frequency axis menu and select the Record length item. Another menu will pop up, containing the available record lengths. The Frequency axis menu can also be entered by pressing the right mouse button over one of the frequency axis controls or read outs. For changing the record length the following function keys are available: Select a shorter record length Select a longer record length Note: Calculating a spectrum is time consuming. The time need for calculating a spectrum is strongly dependent on the calculating power of the computer and of the selected record length. Setting up the FFT FFT window function To reduce 'smearing' errors (See Windowing), a windowing function can be selected. The Spectrum Analyzer 65
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Page 84: DATAQ Instruments, Inc. 241 Springs
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DI-770 Oscilloscope provides five virtual instruments in one

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