MDO3000 Programmer Manual.pdf - 第919页

Commands Listed in Alphabetical Order TRIGger:A:LO Werthreshold:D<x> Sets the lower threshold for the digita l channel se lected. Each channel ca nh a v e an independent level. Used in runt an d transition as the l…

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Commands Listed in Alphabetical Order
TRIGger:A:LO
Werthreshold{:AUX|:EXT}
This command specifies the lower threshold for the Aux Input connector.Usedfor
the following trigger types: runt, transition.
Conditions
This command is not available for MDO4000/B series models, or the 4-channel
MDO3000 series models as they have no Aux Input connector. However, the
2-channel
MDO3000 models do have an auxin, so this command is available.
Group
Trigger
Syntax
TRIGger:A:LOWerthreshold{:AUX|:EXT} {<NR3>|ECL|TTL}
TRIGger:A:LOWerthreshold{:AUX|:EXT}?
Arguments
<NR3> is a floating point number that specifies the threshold level in volts.
ECL specifies a preset ECL high level of –1.3V.
TTL specifies a preset TTL high level of 1.4V.
TRIGger:A:LOWerthreshold:CH<x>
This command specifies the lower threshold for the channel selected. Each
channel can have an independent level. Used in runt and transition triggersasthe
lower threshold. Used for all other trigger types as the single level/threshold.
Group
Trigger
Syntax
TRIGger:A:LOWerthreshold:CH<x> {ECL|TTL|<NR3>}
TRIGger:A:LOWerthreshold:CH<x>?
Arguments
ECL specifies a preset ECL high level of –1.3V.
TTL specifies a preset TTL high level of 1.4V.
<NR3> is a floating point number that specifies the clock level, in volts.
Examples
TRIGGER:A:LOWERTHRESHOLD:CH2 50E-3 sets the lower limit threshold for
CH2ofthepulserunttriggerto50mV.
TRIGGER:A:LOWERTHRESHOLD:CH2? might return :T RIGGER:A:
LOWERTHRESHOLD:CH2 1.2000E-01
indicating that the lower limit threshold
for CH2 of the pulse runt trigger is set to 120 mV.
2-888 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
TRIGger:A:LO
Werthreshold:D<x>
Sets the lower threshold for the digital channel selected. Each channel canhave
an independent level. Used in runt and transition as the lower threshold. Used for
all other tri
gger types as the single level/threshold.
NOTE. MDO3000 models only have two digital threshold contro ls: one for digital
channels D0 - D7, and the other for D8 - D15. Digital channel trigger levels
cannot be set independently for these models. Changing one digital channel’s
threshold l evel changes all of the channels’ levels in the same set.
Group
Trigger
Syntax
TRIGger:A:LOWerthreshold:D<x> {<NR3>|ECL|TTL}
TRIGger:A:LOWerthreshold:D<x>?
Arguments
<NR3> is a floating point number that specifies the threshold voltage, in volts.
ECL specifies a preset ECL high level of –1.3V.
TTL specifies a preset TTL high level of 1.4V.
Examples
TRIGGER:A:LOWERTHRESHOLD:D1 0.5 sets the lower threshold to 0.5 volts.
TRIGGER:A:LOWERTHRESHOLD:D1? might return
TRIGGER:A:LOWERTHRESHOLD:D1 -1.3000 indicating the lower threshold
is set to -1.3 volts.
TRIGger:A:LOWerthreshold:RF
This command specifies the lower threshold when using the internal RF power
level for a RUNT trigger, or the single threshold in the cases of the PULSE and
TIMEOUT triggers.
To specify the upper threshold for the internal RF power level for the RUNT
trigger type, use the command TRIGger:A:UPPerthreshold:RF. To choose the
RUNT trigger type, use the command TRIGger:A:PULse:CLAss.
Conditions
MDO4000/B/C models only. Also requires installation of an MDO4TRIG
application module.
Group
Trigger
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-889
Commands Listed in Alphabetical Order
Syntax
TRIGger:A:LOW
erthreshold:RF {<NR3>}
TRIGger:A:LOWerthreshold:RF?
Related Commands
TRIGger:A:TYPe, TRIGger:A:EDGE:COUPling, TRIGger:A:EDGE:SLOpe,
TRIGger:A:UPPerthreshold:RF
Arguments
<NR3> is a floating point number that specifies the threshold to use, in the
currently selected RF units (using RF:UNIts). The range is (ref level – 40 dBm) to
(ref level + 10 dBm), but never less than –65 dBm or more than +30 dBm.
Examples
TRIGger:A:LOWerthreshold:RF —1.000E+1 sets the threshold to –10 dBm.
TRIGger:A:LOWerthreshold:RF? might return -30.0000, indicating that the
threshold set to –30.000 dBm (assuming the units are currently set to dBm).
TRIGger:A:MODe
This command specifies the A trigger mode.
Group
Trigger
Syntax
TRIGger:A:MODe {AUTO|NORMal}
TRIGger:A:MODe?
Arguments
AUTO generates a trigger if one is not detected within a specified time period.
NORMal waits for a valid trigger event.
Examples
TRIGGER:A:MODE NORMAL specifies that a valid trigger event must occur before
atriggerisgenerated.
TRIGGER:A:MODE ? might return :TRIGGER:A:MODE NORMAL indicating that a
valid trigger event must occur before a trigger is generated.
TRIGger:A:PULse:CLAss
This command specifies which kind of pulse to trigger on (either runt, width,
transition (rise/fall or slew rate) or timeout). You also need to set the trigger type
to
PULSe using the command TRIGger:A:TYPe.
2-890 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual