Tektronix TDS1000- Bedienungsanleitung PDF herunterladen (Seite 144)

Math FFT

126

TDS1000/2000-Series Digital Oscilloscope User Manual

Measuring an FFT Spectrum Using Cursors

You can take two measurements on FFT spectrum s: magnitude

(in dB) and frequency (i n Hz). Magnitude is referenced to 0 dB,

where 0 dB equals 1 V

RMS

. You can use the cursors to take

measurements at any zoom factor.

Push CURSOR

" Source and select Mat h. Push t he Type option

button to select between Magnitude and Frequency. Use the Vertical

Position knobs to move cursors 1 and 2.

Use horizontal cursors to measure magnitude and verti cal c ursors to

measure frequency. The options display the delta between the two

cursors, the value at cursor 1 position, and the value at cursor 2

position. Delta is the absolute value of cursor 1 minus cursor 2.

Magnitude cursors

Frequency cursors

You can also take a frequency measurement. To do so, turn t he

Horizontal Position knob to position a frequency component on the

center graticule line and rea d the frequency at the top right of the

display.

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Tektronix TDS1000- Bedienungsanleitung Seite 144