Bnc 645 User Manual download pdf (Page 141)

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and the maximum frequency of the function used.

Maximum center frequency = Maximum frequency – span/2

FREQuency:CENTer? [MINimum|MAXimum]

The center frequency in sweeps will be returned in hertz.

FREQuency:SPAN{<frequency>|MINimum|MAXimum }

Specify the frequency span in sweeps. The range is from 0 Hz to 200 kHz for

ramps, from 0 Hz to 10 MHz for arbitrary waveforms, from 1µHz to 25 MHz for

square, and from 1µHz to 50 MHz for sine. The default is 900 Hz. The minimum

value is 0 Hz and the maximum value is calculated based on the center

frequency and the maximum frequency of the function used.

Maximum frequency span = 2 X (Maximum frequency – center frequency)

--To sweep up in frequency, specify a positive frequency span.

--To sweep down in frequency, specify a negative frequency span.

The following equation shows the relationship between frequency span and

start/stop frequency.

Frequency span = Stop frequency – Start frequency

FREQuency:SPAN? [MINimum|MAXimum]

The frequency span in hertz will be returned.

FSKey: FREQuency {<frequency>|MINimum|MAXimum}

Specify the FSK alternate (or ”hop”) frequency. The range is from 1 μHz to 200

kHz for ramps, 1 μHz to 10 MHz for arbitrary waveforms, from 1µHz to 25 MHz

for square, and from 1µHz to 50 MHz for sine, and the default is 100Hz.

FSKey: FREQuency? [MINimum|MAXimum]

Query the “hop” frequency in FSK. The “hop” frequency in hertz will be returned.

FSKey: INTernal:RATE {<rate in Hz>|MINimum|MAXimum }

Specify the rate at which the output frequency “shifts” between the carrier and

the hop frequency. The range is from 2 mHz to 100 kHz and the default is 10 Hz.

This FSK rate is used only when the FSK source is internal (FSK:SOUR INT).

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Bnc 645 User Manual Page 141