HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

TWNDOW
Trace Window
Creates a window trace array for the fast Fourier transform (FFT) function.
Syntax
TWNDDW
7 d e s t i n a t i o n r w i n d o w
b u s e r - d e f i n e d t r a c e /
b t r a c e r a n g e /
Item Description/Default
User-defined trace A trace defined by the TRDEF command.
Trace Range A segment of trace A, trace B, trace C, or a user-defined trace
Range
Any valid trace name.
Prerequisite Commands: TRDEF when using a user-defined trace. TS when using trace data.
Related Commands: FFT.
Example
Connect calibrator signal to the spectrum analyzer input.
OUTPUT 718;"IP;"
OUTPUT 718;"CF 300MHZ;"
OUTPUT 718;"SP 0HZ;ST 800MS;"
OUTPUT 718;"TRDEF NEW,401;"
OUTPUT 718;"TWNDOW NEW,UNIFORM;"
OUTPUT 718;"CLRW TRB;"
OUTPUT 718;"SNGLS;TS;TS;"
OUTPUT 718;"FFT TRA,TRB,NEW;"
OUTPUT 718;"BLANK TRB;"
OUTPUT 718;"VIEW TRA;"
Description
Initializes analyzer:
Changes the center frequency.
Changes span, sweep time.
Dq@uxs a trace called NEW
Trace NE?Vstores the window algorithm, UNIFORM.
Activates single-sweep mode and updates trace.
Performs fast I;burier transform on trace B and
stores the results in trace A.
Displays the result.
The trace window function creates a trace array according to three built-in algorithms:
UNIFORM, HANNING, or FLATTOP When used with the FFl? command, the three algorithms
give resultant passband shapes that represent a give-and-take between amplitude uncertainty,
sensitivity, and frequency resolution. See “FFT” for more information about these algorithms
and the FFT function.
5-578 Programming Commands