MDO3000 Programmer Manual.pdf - 第603页
Commands Listed in Alphabetical Order (e.g. 10000, 20 000, 50000). T o specify the RBW ratio that will be used when the mode is set to automatic, use the command RF:SP ANRbwratio . MANual allows you to set the resolution…
Commands Listed in Alphabetical Order
RF:RBW
This command specifies the resolution bandwidth (RBW) when the RBW mode
has been set to MANUAL (using the command RF:RBW:MODe). The resolution
bandwidth is the width of the narrowest measurable band of frequencies in a
frequency domain trace. The RBW is adjustable down to 20Hz. By default, the
RBW tracks t
he span value in a 1000:1 ratio.
The RBW determines the level to which the oscilloscope can resolve individual
frequencies in the frequency domain. For example, if the input signal contains
two carriers separated by 1 kHz, you will not be able to discriminate between
them unless the RBW is less than 1 kHz.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:RBW <NR3>
RF:RBW?
Arguments
<NR3> is a floating point number that represents the width of the narrowest
measurable band of frequencies in a frequency domain trace.
Examples
RF:RBW 2.0E+04 sets the RBW to 20 kHz.
RF:RBW? might return 3.0000E+6, indicating that the RBW has been set to 3 MHz.
RF:RBW:MODe
This command specifies the resolution bandwidth (RBW) mode, either automatic
or manual.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:RBW:MODe {AUTO|MANu al}
RF:RBW:MODe?
Arguments
AUTO sets the resolution bandwidth automatically as the span is changed. The
default behavior is 1000:1, but you can set it to other values in a 1–2–5 sequence
2-572 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
(e.g. 10000, 20
000, 50000). To specify the RBW ratio that will be used when the
mode is set to automatic, use the command RF:SPANRbwratio.
MANual allows
you to set the resolution bandwidth, independently from the span,
using the command RF:RBW.
Examples
RF:RBW:MODe MANual sets the mode to manual.
RF:RBW:MODe? might return AUTO, the default.
RF:REFLevel
This command sets the Reference Level of the RF input. The Reference Level can
either be specified as a numeric floating point value, or set automatically.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:REFLevel {<NR3>|AUTO }
RF:REFLevel?
Arguments
<NR3> is a floating point number.
AUTO directs the oscilloscope to automatically calculate and set the Reference
Level. This is a one-time calculation based on the content of the RF input signal.
It is not a “mode”.
Examples
RF:REFLevel –10 sets the Reference Level to –10 dBm.
RF:REFLevel? might return 0.0E+0, indicating a Reference Level of 0 dBm.
RF:RF_AMPlitude:LABel
This command specifies the label for the RF Amplitude vs. Time trace.
Conditions
MDO4000/B/C models only.
Group
RF
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-573
Commands Listed in Alphabetical Order
Syntax
RF:RF_AMPlitu
de:LABel <QString>
RF:RF_AMPlitude:LABel?
Related Commands
RF:RF_FREQuency:LABel, RF:RF_PHASe:LABel, RF:LABel
Arguments
<QString> is a quoted string of up to 32 characters.
RF:RF_AMPlitude:VERTical:POSition
This command specifies the vertical position of the RF Amplitude vs. Time trace.
The position value determines the vertical graticule location at which thetrace
is displayed. Increasing the position value of a waveform causes the waveform
to move up. Decreasing the position value causes the waveform to move down.
The minimum is -50 divisions and the maximum is 50 divisions with a resolution
of 0.02 divisions.
Conditions
MDO4000/B/C models only.
Group
RF
Syntax
RF:RF_AMPlitude:VERTical:POSition <NR3>
RF:RF_AMPlitude:VERTical:POSition?
Arguments
<NR3> is a floating point number.
Examples
RF:RF_AMPlitude:VERTical:POSition —1 sets the vertical position of the
RF Amplitude vs. Time trace to -1 division.
RF:RF_AMPlitude:VERTical:POSition? might return 0.0E+0, indicating a
vertical position of 0.
RF:RF_AMPlitude:VERTical:SCAle
This command specifies the vertical scale for the RF Amplitude vs. Time trace.
For a signal with constant amplitude, increasing the scale causes the waveform to
be displayed smaller. Decreasing the scale causes the waveform to be displayed
larger.
Conditions
MDO4000/B/C models only.
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