MDO3000 Programmer Manual.pdf - 第920页

Commands Listed in A lphabetical Order Syntax TRIGger:A:LOW erthreshold:RF {<NR3>} TRIGger:A:LOW erthreshold:RF? Related Commands TRIGger:A:TYPe , TRIGger:A:EDGE:COUPling , TRIGger:A:EDGE:SLOpe , TRIGger:A:UPPerthr…

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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
Commands Listed in Alphabetical Order
To set the trigg
er source for a pulse trigger, use TRIGger:A:RUNT:SOUrce,
TRIGger:A:PULSEWidth:SOUrce, TRIGger:A{:TRANsition|:RISEFall}:
SOUrce,orTRIGger:A:TIMEOut:SOUrce.
To set the trigger voltage threshold level for a pulse trigger, use TRIGger:A:
LEVel:AUXin, TRIGger:A:LEVel:CH<x>,orTRIGger:A:LEVel:D<x>.
Group
Trigger
Syntax
TRIGger:A:PULse:CLAss {RUNt|WIDth|TRANsition|TIMEOut}
TRIGger:A:PULse:CLAss?
Related Commands
TRIGger:A:TYPe, TRIG
ger:A:RUNT?, TRIGger:A{:TRANsition|:RISEFall}?
Arguments
RUNt triggers when a pulse crosses the first preset voltage threshold but
does not cross the second preset threshold before recrossing the first. Use
with the command TRIGger:A:RUNT:SOUrce, TRIGger:A:RUNT:POLarity,
TRIGger:A:RUNT:WHEn,andTRIGger:A:RUNT:WIDth.
WIDth triggers when a pulse is found that has the specified width or duration
and is either inside or outside the specified time limits. Use with the commands
TRIGger:A:PULSEWidth:HIGHLimit, TRIGger:A:PULSEWidth:LOWLimit,
TRIGger:A:PULSEWidth:POLarity, TRIGger:A:PULSEWidth:SOUrce,
TRIGger:A:PULSEWidth:WHEn,andTRIGger:A:PULSEWidth:WIDth.
TRANsition (AKA rise/fall or slew rate) triggers when a pulse crosses both
thresholds in the same direction as the specified polarity and the transition time
between the two threshold crossings is greater or less than the specified time
delta. Use with the commands TRIGger:A{:TRANsition|:RISEFall}:DELTatime,
TRIGger:A{:TRANsition|:RISEFall}:POLarity, TRIGger:A{:TRANsition|:
RISEFall}:SOUrce,andTRIGger:A{:TRANsition|:RISEFall}:WHEn,
TIMEout triggers when no pulse is detected within a specified time. The
signal stays above, below, or either above or below, a set value for a set
amount of time. Use with the commands TRIGger:A:TIMEOut:TIMe,
TRIGger:A:TIMEOut:POLarity, TRIGger:A:TIMEOut:SOUrce
Examples
TRIGGER:A:PULSE:CLASS WIDTH specifies a width pulse for the A trigger.
TRIGGER:A:
PULSE:CLASS?
might return :TRIGGER:A:PULSE:CLASS WIDTH
indicating that the trigger is set to activate on a pulse of a specified polarity and
width.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-891