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R&S FSQ Signal Analyzer - Rohde & Schwarz

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R&S <strong>FSQ</strong> Remote Control – Description of Commands<br />

[SENSe:]BANDwidth|BWIDth:VIDeo:RATio 0.01 to 1000<br />

SENSe Subsystem<br />

This command defines the ratio video bandwidth (Hz) / resolution bandwidth (Hz).The ratio to be<br />

entered is reciprocal to the ratio RBW/VBW used in manual operation.<br />

Example: "BAND:VID:RAT 3"<br />

'Sets the coupling of video bandwidth to video bandwidth = 3*resolution bandwidth<br />

Characteristics: *RST value: 3<br />

SCPI: conform<br />

Mode: A<br />

[SENSe:]BANDwidth|BWIDth:VIDeo:TYPE LINear | LOGarithmic<br />

This command selects the psition of the video filter in the signal path, provided that the resolution<br />

bandwidth is ≤100 kHz:<br />

• If LINear is selected, the video filter is connected ahead of the logarithmic amplifier (default)<br />

• If LOGarithmic is selected, the video filter follows the logarithmic amplifier<br />

The essential difference between the two modes is the transient response at falling signal edges:<br />

If LINear is selected, the measurement with logarithmic level scaling yields a much "flatter" falling edge<br />

than LOGarithmic. This behavior is due to the conversion of linear power into logarithmic level. If the<br />

linear power is halved, the level decreases by only 3 dB.<br />

Example: "BAND:VID:TYPE LIN"<br />

'Video filter ahead of the logarithmic amplifier<br />

Characteristics: *RST value: LIN<br />

SCPI: device-specific<br />

Mode: A<br />

6.152 Operating Manual 1313.9681.12 - 01

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