MDO3000 Programmer Manual.pdf - 第780页

Commands Listed in A lphabetical Order RUNt searches f or when a puls e cr osses the first p reset voltage threshold, but does not cross the second preset threshold before recrossing the first. The thresholds are set using…

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Commands Listed in Alphabetical Order
Syntax
SEARCH:SEARCH
<x>:TRIGger:A{:TRANsition|:RISEFall}:WHEn
{SLOWer|FASTer|EQual|UNEQual}
SEARCH:SEARCH<x>:TRIGger:A{:TRANsition|:RISEFall}:WHEn?
Arguments
FASTer sets the search to occur when the transitioning signal is faster than the set
volts/second rate.
SLOWer sets the search to occur when the transitioning signal is slower than the
set volts/second rate.
EQual sets the search to occur when the transitioning signal is equal to the set
volts/second rate within a ±5% tolerance.
UNEQual sets the search to occur when the transitioning signal is not equal to
the set volts/second rate ±5%.
SEARCH:SEARCH<x>:TRIGger:A:TYPe
This command specifies the search type to determine where to place a mark. The
default search type is
EDGe. SEARCH<x> is the search number, which is always 1.
NOTE. A series o f example command sequences showing differe
nt searches and
triggers is included as an appendix. (See page F-1, Search and Trigger Command
Sequence Examples.)
Group
Search
Syntax
SEARCH:SEARCH<x>:TRIGger:A:TYPe
{EDGe|PULSEWidth|SETHold|RUNt|TRANsition|LOGIc|TIMEOut|BUS
(with t he appropria te application module i
nstalled)}
SEARCH:SEARCH<x>:TRIGger:A:TYPe?
Arguments
EDGe is the default search. An edge search occurs when a signal
passes through a specified voltage level in a specified direction and is
controlled by the SEARCH:SEARCH<x>:TRIGger:A:EDGE:SOUrce and
SEARCH:SEARCH<x>:TRIGger:A:EDGE:SL
Ope commands.
PULSEWIdth searches when a pulse is found that has the specified
polarity, and is either inside or outside the limits as specified by
SEARCH:SEARCH<x>:TRIGger:A:LOGIc:PATtern:WHEn:LESSLimit and
SEARCH:SEARCH<x>:TRIGger:A:LOGIc:PATtern:WHEn:MORELimit.
The polarity is selected using the SEARCH:SEARCH<x>:TRIGger:A:RUNT:
POLarity command.
SETHold specifies a setup and hold search.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-749
Commands Listed in Alphabetical Order
RUNt searches f
or when a pulse crosses the first preset voltage threshold, but does
not cross the second preset threshold before recrossing the first. The thresholds
are set using the SEARCH:SEARCH<x>:TRIGger:A:LOWerthreshold:CH<x>
and SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:CH<x> commands.
TRANsition searches for when a pulse crosses both thresholds in the sam
e
direction as the specified polarity and the transition time between the two
threshold crossings is greater or less than the specified time delta.
LOGic specifies that a search occurs when specified conditions are met, and is
controlled by the
SEARCH:A:LOGIc commands.
TIMEout specifies that a search occurs when no pulse is detected in a specified
time.
BUS specifies that a search occurs when a communications signal is found.
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:CH<x>
This command specifies the channel waveform upper threshold to determine
where to place a mark. This setting is applied to all channel searches that uses an
upper threshold.
SEARCH<x> is the search number, which is always 1, and CH<x>
is the channel number, which is 1–4.
Group
Search
Syntax
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:CH<x> {TTL}
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:CH<x>?
Arguments
TTL specifies a preset TTL high level of 1.4 V.
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:MATH
This command specifies the math waveform upper threshold to determine where
to place a mark. This setting is applied to all math waveform searches that uses an
upper threshold. <x> is the search number.
Group
Search
Syntax
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:MATH {TTL}
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:MATH?
Arguments
TTL specifies a preset TTL high level of 1.4 V.
2-750 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
SEARCH:SEARC
H<x>:TRIGger:A:UPPerthreshold:REF<x>
This command specifies the reference waveform upper threshold to determine
where to place a mark. This setting is applied to all reference waveform searches
that use an up
per threshold.
SEARCH<x> is the search number, which is always 1,
and
REF<x> is the reference channel number, which can be 1–4.
Group
Search
Syntax
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:REF<x> {TTL}
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:REF<x>?
Arguments
TTL specifies a preset TTL high level of 1.4 V.
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:RF_AMPlitude
For a runt or transition search using the RF Amplitude vs. Time
trace, this command specifies the upper threshold to be used by the
search engine. (To specify the lower threshold, use the command
SEARCH:SEARCH<x>:TRIGger:A:LOWerthreshold:RF_AMPlitude.)
Conditions
MDO4000/B/C models only.
Group
Search
Syntax
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:RF_AMPlitude
{<NR3>}
SEARCH:SEARCH<x>:TRIGger:A:UPPerthreshold:RF_AMPlitude?
Related Commands
TRIGger:A:UPPerthreshold:RF
Arguments
<NR3> is a floating point number that specifies the threshold for the time domain
trace, in volts.
Examples
SEARCH:SEARCH1:TRIGger:A:UPPerthreshold:RF_AMPlitude 1 sets the
upper threshold to 1V.
SEARCH:SEARCH1:TRIGger:A:UPPerthreshold:RF_AMPlitude? might
return 1.000E+0, indicati
ng that the upper threshold has been set to 1V.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-751