Velleman PCS100A pcs100 - pcs500 - k8031 - Manual (Page 17)

PCS500 / PCS100 / K8031
17
Edit Menu
Copy
Copies the image to the Windows' clipboard.
Paste
Pastes the image residing in Windows' clipboard to the screen.
Options Menu
FFT Window
Spectrum analyzer supports five different FFT windows
It is common practice to taper the original signal before calculating the FFT
(Fast Fourier Transformation). This reduces any discontinuities at the edges
of the signal. This is done by multiplying the signal with a suitable window
function.
1. Rectangular
2. Bartlett
3. Hamming
4. Hanning
5. Blackman
The Hamming window is set as default at the startup
You can see the effect of different window functions to a frozen spectrum too.
Set the window function used to taper the original signal before calculating the
FFT.
FFT Options
Maximum
Maximum value of each frequency is displayed in Run mode.
This option can be used for recording signal levels as a function of frequency
(Bode plot). You can use spreadsheet to display the frequency response
curve including the frequency labels. On File menu, click Save FFT Data to
export the data to the spreadsheet.
Average
Displays smoothed values in Run mode. Use this option to reduce the noise
level.
Hardware Setup
Select the LPT port address where the hardware is connected
378, 278 or 3BC
You'll find the address either from BIOS setup or from Windows' Device
Manager:
1 Click "System" icon in Control Panel and then the Device Manager tab.
2 Click the plus sign next to the "Ports".
3 Double-click "Printer Port (LPTx)".
4 Click the Resources tab to see the Input/Output address.