MDO3000 Programmer Manual.pdf - 第612页

Commands Listed in A lphabetical Order Group RF Syntax RF:SPAN <NR3> RF:SPAN? Related Commands RF:FREQuency , RF:ST ARt , RF:STOP Arguments <NR3> is a floating point number . Examples RF:SPAN 2E9 sets the span…

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Commands Listed in Alphabetical Order
RF:SCAle
This command specifies the overall vertical scale setting of the frequency domain
window. The lower limit is 0.1 dB/division. The upper limit is 100dB/division.
The vertical
scale is adjustable in a 1–2–5 sequence.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:SCAle <NR3>
RF:SCAle?
Arguments
<NR3> is a floating point number.
Examples
RF:SCAle 10 sets the vertical scale to 10 dB/division.
RF:SCAle? might return 10.000, indicating that the vertical scale has been set
to 10 dB/division.
RF:SPAN
This command specifies the span setting. The span is the range of frequenciesthat
can be observed around the center frequency. This is the width of the frequency
domain trace, which is equal to the stop frequency minus the start frequency.
The maximum span varies according to the oscilloscope model. For the
4000 series models, the maximum span is either 3 GHz or 6 GHz. For the
MDO3000 series models, the maximum span matches the analog bandwidth
rating; however, if the MDO3SA option is installed, then the maximum span
is 3 GHz.
NOTE. For the parameters RF:STARt, RF:STOP, RF:FREQuency and RF:SPAN,
when any one of the parameters is changed, the following relationship is enforced:
START = FREQ – SPAN/2
STOP = FREQ + SPAN/2
FREQ = (START + STOP)/2
SPAN = STOP – START
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-581
Commands Listed in Alphabetical Order
Group
RF
Syntax
RF:SPAN <NR3>
RF:SPAN?
Related Commands
RF:FREQuency, RF:STARt, RF:STOP
Arguments
<NR3> is a floating point number.
Examples
RF:SPAN 2E9 sets the span to 2 GHz.
RF:SPAN? might return 10.0000E+6, indicating the span is 10MHz.
RF:SPANRbwratio
This command specifies the ratio of the span to the resolution bandwidth (RBW)
that will be used when the RBW Mode is set to AUTO. (In order to set the RBW
Mode to AUTO, use the command RF:RBW:MODe.)
The span is the width of the frequency domain trace in Hz, which is equal to the
stop frequency minus the start frequency. The RBW is the width of the narrowest
measurable band of frequencies in a frequency domain trace. The default RBW
ratio is a factor of 1000.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:SPANRbwratio <NR3>
RF
:SPANRbwratio?
Arguments
<NR3> is a floating point number.
Examples
RF:SPANRbwratio 1000 would force the scope to adjust the RBW to one
one-thousandth of the span.
RF:SPANRbwratio? might return 1.0000E+3, which means the RBW has been
set to one one-thousandth of the span.
2-582 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
RF:SPECTRogr
am (No Query Form)
Clears the spectrogram.
Conditions
Available for MDO4000/B/C and MDO3000 series models only.
Group
RF
Syntax
RF:SPECTRogram {CLEAR}
Arguments
CLEAR clears the spectrogram.
Examples
RF:SPECTR CLEAR clears the spectrogram.
RF:SPECTRogram:NUMSLICEs? (Query Only)
This query returns the number of spectrogram slices that are currently being
rendered. A spectrogram slice is a section of the spectrogram representing one
interval, or slice, of time in the spectrogram record.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:SPECTRogram:NUMSLICEs?
Related Commands
RF:SPECTRogram:STATE,RF:SPECTRogram:NUMSLICEs?,
Examples
RF:SPECTRogram:NUMSLICEs? might return 85, indicating that the spectrogram
is made up of 85 individual time slices.
RF:SPECTRogram:SLICESELect
This command specifies the spectrogram slice number that is to be displayed.
The slice can only be selected or changed when acquisitions have been stopped.
As soon as acquisitions start again, the slice number is reset to 0 (the latest slice).
Attempts to select a slice number outside of range, or when acquisitions are
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-583