MDO3000 Programmer Manual.pdf - 第600页

Commands Listed in A lphabetical Order RF:PRObe:PRE Amp:ST A T us? (Query Only) Returns the actual status of the RF pre-amp connected to the R F input. The returned status enumerations are: NONe –n op r e - a m pi sc o n…

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Commands Listed in Alphabetical Order
Examples
RF:PROBE:ID:T
YPE?
might return :RF:PROBE:ID:TYPE "P6203" indicating
that P6203-type probe is attached to the RF input.
RF:PRObe:PREAmp:MODe
Sets or returns the user-selected mode for an RF pre-amp connected to the RF
input - either
BYPass or AUTO.
Note that the actual status of the pre-amp (either
NONE, ON or BYPass)is
determined by the selected mode along with the RF reference level. You can query
the status of the pre-amp using the command RF:PRObe:PREAmp:STATus?
Conditions
MDO3000, MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
RF
Syn
tax
RF:PRObe:PREAmp:MODe <BYPass|AUTO>
RF:PRObe:PREAmp:MODe?
Related Commands
RF:PRObe:PREAmp:STATus?
Arguments
BYPass means the pre-amp will not amplify the signal. When the mode is set to
BYPass, the pre-amp amplification is always off, regardless of the RF reference
level.
AUTO means the pre-amp will turn its amplification on or off based on the RF
reference level. When the
MODe is set to AUTO and the RF reference level is below
the RF reference level threshold, then the pre-amp amplification is automatically
turned on, and the
STATus is set to ON. When the RF reference level is at or above
the RF reference level threshold, then the pre-amp amplification is automatically
turned off, and the
STATus is set to BYPass.
NOTE. The RF reference level threshold for the TPA-N-PRE model pre-amp is
-25 dBm on MDO4000/B/C models, and -15 dBm on MDO3000 models.
Examples
RF:PRObe:PREAmp:MODe BYP sets the preamp so that it will not amplify the
signal.
RF:PRObe:PREAmp:MODe? might return AUTO, indicating that the pre-amp
amplification has been set to turn on or off depending on whether the RF reference
level is above or below the RF reference level threshold.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-569
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