User Manual

ManualsBrandsB&K Precision ManualsBenchtop OscilloscopesOscilloscope, 4x 100MHz, 2GSPS

100

Window

Characteristics

Applications

Rectangle

The best frequency

resolution, but the poorest

amplitude resolution. Similar

to when no window is

applied.

Transient or short pulses. Sine

waveform with the same amplitude

and rather similar frequencies. Wide

band random noise with relatively

slowly changing waveform spectrum.

Hanning

Better frequency resolution;

poorer amplitude resolution.

Sine, periodic and narrow band

random noise.

Hamming

Somewhat better frequency

resolution than Hanning.

Transient or short pulse, the signal

levels before and after the

multiplication are rather different.

Blackman

The best amplitude

resolution; the poorest

frequency resolution.

Single frequency signal, search for

higher order harmonics.

Table 7 - FFT window instructions

5. Press the Center softkey and turn the Universal Knob to set the frequency of the center

vertical line.

6. Press the Hz/div softkey and turn the Universal Knob to set the vertical range of the display.

7. Press the FFT Zoom softkey and turn the Universal Knob or turn the horizontal scale knob to

select the desired magnification (1X, 2X, 5X, 10X). Set the FFT Zoom to a higher magnification

to see more details of the FFT waveform.

8. Press the Scale softkey to select the units per division for the vertical axis. The units of the

vertical axis can be dBVrms (logarithmic) or Vrms (linear). If you need to display the FFT

frequency spectrum with a large dynamic range, dBVrms is recommended.

9. Press the Reference Level softkey and turn the Universal Knob to adjust the position of the

FFT's vertical position.

10. Press the Unit softkey and turn the Universal Knob to display with a Vrms (linear) or dBVrms

(logarithmic) vertical scale.

11. Press the Display softkey to select Split, Full Screen, and Exclusive display mode.

 Split: the source channel and the FFT operation results are displayed separately. The time

domain and frequency domain signals are displayed on separate portions of the screen.

 Full Screen: the source channel and the FFT operation results are displayed in the same

window to view the frequency spectrum more clearly and to perform more precise

measurements.

 Exclusive: only the FFT operation results are displayed in full screen.