HP Cable Box 8591C manual Series and L-Series Spectrum Analyzers and HP 8591C

CONTINUS FFT

Spectrum Analyzer Mode Key Descriptions

Spectrum Analyzer Mode Functions

initializes the fast Fourier transform (FFT) function, puts the analyzer in continuous sweep and performs an FFT at the end of each sweep. If the FFT function is already active, it puts the analyzer in continuous sweep and performs FFTs.

After using the FFT function, the display is in log mode. The markers are put in the FFT mode for use in evaluating the data. The signal being transformed is in trace A and the Fourier transform of the signal is in trace B. (Any information that was in trace B and C will be lost.) Press

FFT OFF to return the analyzer to normal operation.

Refer to Chapter 5, “Measuring Amplitude Modulation Using the Fast Fourier Transform Function, )) for more information.

Front-Panel Key Access (jjj

initiates an output of the screen data, without an external controller, to a previously specified graphics printer or plotter. Refer to Chapter 1 of this manual or the HP 8590

E-Seri’es and L-Series S’trum Analyzers and HP 8591C Cable TV Analyzer Programmer’s Guide for detailed information about printing and plotting.

The printer or plotter must have already been selected using [CONFIG-] and either Plot Conf ig (for a plotter)

or Print Conf ig (for a printer). To obtain a print,

press (m), COPY DEV PRNT PLT (so that PRNT is

underlined), then Print Conf ig Use BAUD RATE to change the baud rate of the analyzer, if necessary. For Option 021, use PRINTER ADDRESS to change the HP-IB address of the printer, if necessary.

If the analyzer is connected to an HP PaintJet printer and you want a color printout, press PAINTJET PRINTER If the analyzer is connected to an HP PaintJet printer and you want a black and white printout, press HP B&W PRINTER . More printer information can be found in the HP 8590

E-Series and L-Series Spectrum Analyzers and HP 8591C

6-45