Agilent Technologies 54657A Betriebsanweisung PDF herunterladen (Seite 76)

Selectable

Windows

Four windows are selectable: Hanning, for best frequency resolution and

general purpose use; flattop, for best amplitude accuracy; rectangular, for

single-shot signals such as transients and signals where there are an

integral number of cycles in the time record, and exponential for best

transient analysis.

Window

Characteristics

Window Highest

Side Lobe

(dB)

3dB

Bandwidth(b

ins)

6dB

Bandwidth(b

ins)

Scallop

Loss

(dB)

Rectangular – 13 0.89 1.21 3.92

Hanning −32 1.44 2.00 1.42

Flattop – 70 3.38 4.17 0.005

FFT Freq Range dc to 100 MHz (54600/54601/54645)

dc to 150 MHz (54602)

dc to 60 MHz (54603)

dc to 500 MHz (54610/54615/54616)

Freq Span Control This control allows you to specify the frequency span of the FFT display.

When the Span is adjusted the display will expand or contract about the

center frequency as set by the Center Frequency control. Refer to Figure

3-1 for the limits of the Frequency Span control.

Center Freq

Control

This control allows you to specify the frequency at the center of the FFT

display. When the Frequency Span is changed, the FFT display will

expand or contract about the frequency at the center of the display.

Refer to Figure 3-1 for the limits of this control.

Move 0 Hz to Left Pressing this soft key will move the FFT display so that the left hand edge

of the display will be 0Hz.

FFT Vector

display

When the time domain display is turned off the FFT display will be

displayed in vector drawing mode. The time domain display can be

turned off by pressing the Channel # key twice

Display FFT vertical units in dB.

Units/Div This control allows you to adjust the vertical scaling of the FFT display in

a 1-2-5 sequence from 1 dB/div to 50 dB/div.

Reference Level This control allows adjustment of the reference level of the FFT display

across a range of 400 dBV. The minimum setting is -196 dB at 1 dBV/div

decreasing to 0 dBV at 50 dBV/div. The maximum setting is 400 dBV at 50

dB/div, decreasing to 204 dB at 1 dBV/div.

Programmability All front-panel controls are fully programmable over GPIB (54657A)

or RS-232 (54658A and 54659B)

Reference Information

Operating Characteristics

3–4

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 88 89

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