MDO3000 Programmer Manual.pdf - 第601页

Commands Listed in Alphabetical Order Examples RF:PRObe:RESi stance? might return :RF:PR OBE:RESISTANCE 1.0000E+6 indicating that the input resistance of the probe attached to the RF input i s1M Ω . NOTE. This query will…

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Commands Listed in Alphabetical Order
RF:PRObe:PRE
Amp:STATus? (Query Only)
Returns the actual status of the RF pre-amp connected to the RF input. The
returned status enumerations are:
NONe –nopre-ampisconnected.
ON – the pre-amp is connected and is in the amplification (non-bypassed)
state.
BYPass – the pre-amp is connected but is in the bypassed state because the
mode is set to
BYPass,orthemodeissettoAUTO and the RF reference level
is at or above the RF reference level threshold.
You can set the mode for the pre-amp (either
BYPass or AUTO)usingthe
command RF:PRObe:PREAmp:MODe.
NOTE. Th
e RF reference level threshold for the TPA-N-PRE model pre-amp is
-25 dBm, and -15 dBm on MDO3000 models..
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:PRObe:PREAmp:STATus?
Related Commands
RF:PRObe:PREAmp:MODe
Examples
RF:PRObe:PREAmp:STATus? might return ON, indicating that the pre-amp
connected to the RF input is in the amplification (non-bypassed) state.
RF:PRObe:RESistance? (Query Only)
This query returns the input resistance of the probe attached to the RF input, if the
probe supports it (otherwise, it returns 0.0). The RF input is 50 Ω impedance.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:PRObe:RESistance?
2-570 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
Examples
RF:PRObe:RESi
stance?
might return :RF:PROBE:RESISTANCE 1.0000E+6
indicating that the input resistance of the probe attached to the RF input is1MΩ.
NOTE. This query will return 0.0 if no probe is attached or if the attached probe
does not report the input resistance.
RF:PRObe:SIGnal
This comma
nd specifies the input bypass setting of a TekVPI probe attached to
the RF input. The probe must support input bypass (for example, TCP0001).
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:PRObe:SIGnal {BYPass|PASS}
RF:PRObe:SIGnal?
Arguments
BYPass sets the probe to Bypass mode.
PASS sets the probe to Pass mode.
RF:PRObe:UNIts? (Query O nly)
This query returns a quoted string that describes the units of measure for the
probe attached to the RF input.
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syntax
RF:PRObe:UNIts?
Examples
RF:PROBE:UNITS? might return :RF:PROBE:UNITS "A" indicating that the
probe attached to the RF input is a current probe.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-571
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