MDO3000 Programmer Manual.pdf - 第92页

Command Groups Bus, Video, and RF application modules A table is avail able that lists all commands enabled by each application module (See page H-1, List of Beta Commands and Featur es .) For I 2 C or SPI bus signals, i…

Command Groups

Search Comman

dGroup

The search commands let you analyze your source waveform record for conditions

speciﬁed by a search’s criteria. Once these criteria are matched, the oscilloscope

places a sear

ch mark at that location in the waveform record. You can then

navigate or save the marks. (See page 2-30, Mark Command Group.)

When perfor

ming an edge, pulse width, runt, transition (rise/fall time), time-out,

or bus search, you can use only one waveform at a time.

When perfo

rming a logic or a setup/hold search, you can use any or all of the

displayed waveforms at the same time. For example, with a logic search, you can

search for instances when CH1 is high and CH2 is low. Likewise, with a setup

and hold search, you can search for instances when the clock source is CH1 and

the data sources are CH2 and CH3.

With pulse width searching, the oscilloscope can search for pulses with widths

less than, greater than, equal to, or not equal to a speciﬁed time. Additionally, it

can search for pulses with widths within, or outside of a range of two different

speciﬁ

ed times. Searching can take place on either positive or negative pulses.

Searches on RF waveforms can only use time domain traces (RF Amplitude vs.

Time,

RF Frequency vs. Time and RF Phase vs. Time). (MDO4000/B/C only.)

A series of example command sequences showing different searches and triggers

is in

cluded as an appendix. (See page F-1, Search and Trigger Command

Sequence Examples.)

Searching using

Thr

esholds

All search types except bus searches use thresholds, which are vertical values that

e source waveform must cross in order for a mark to be placed. For example, if

you set the search type to EDGE, and the search source to CH1, the search’s slope

to RISE, and the search’s threshold value to 1.5V, then that search will ﬁnd all

places where CH1 transitions from below 1.5 volts to above 1.5 volts.

Each individual search source waveform has two threshold values: a low threshold

and a high threshold. Note that if you change the search source waveform, you

must explicitly set the thresholds. For example, if you set the search’s CH1lower

threshold to 1.5 volts, and then decide to change the search’s source waveform to

CH2, you must then explicitly set CH2’s lower threshold value to the value you

would like (it will not automatically be 1.5 volts). If you have an edge search set

up on CH1 with the threshold you’d like, then decide to change to a logic search

and change the threshold on CH1 to ﬁt your logic search, and then change back to

an edge search, your initial threshold setting on the edge search will be lost.

MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-61

Command Groups

Bus, Video, and RF

application modules

A table is avail

able that lists all commands enabled by each application module

(See page H-1, List of Beta Commands and Features.)

For I

C or SPI bus signals, install the DPO4EMBD application module,

except for M

DO3000 models, which require MDO3EMBD.

For RS-232, RS-422, RS-485, or UART bus signals, install the DPO4COMP

module, except for MDO3000 models, which require MDO3AUDIO.

For I

S, Left Justiﬁed (LJ), Right Justiﬁed (RJ), or TDM bus signals, install

the DPO4AUDIO module, except for MDO3000 models, which require

MDO3AUDIO.

For CAN, CAN FD, or LIN bus signals, install the DPO4AUTO or

DPO4AUTOMAX module, except for MDO3000 models, which require

MDO3AUTO.

For FlexRay bus signals, install the DPO4AUTOMAX module, except for

MDO3000 models, which require MDO3FLEX.

For Ethernet signals, when tested with the MDO4000/B/C and

MSO/DPO4000B, install the DPO4ENET module. Note that ≥350 MHz

bandwidth models are recommended for 100BASE-TX.

For MIL-STD-1553 or ARINC429 bus signals, install the DPO4AERO

module, except for MDO3000 models, which require MDO3AERO.

For USB bus signals, install the DPO4USB module, except for MDO3000

models, which require MDO3USB. Note that 1 GHz bandwidth models are

recommended for high-speed (HS) USB.

For video signals, install the DPO4VID module, except for the MDO3000

models, which do not require a module.

For RF signals (MDO4000/B/C Series only), install the MDO4TRIG module.

Table 2-39: Search Commands

Command Description

SEARCH?

Returns all search-related settings

SEARCH:SEARCH<x>:COPy Copies the search criteria to the trigger, or the trigger criteria to

the search

SEARCH:SEARCH<x>:LIST? This query returns a list of all automatically created search marks

on waveforms in the time domain (leaving out any manually created

marks). These automatic marks are created using a search

command. The entries returned are in the form of an enumeration

representing the source waveform, followed by 7 time mark

parameters.

SEARCH:SEARCH<x>:STATE Sets the search state to on or off

SEARCH:SEARCH<x>:TOTal? Returns the total number of matches for search <x>

SEARCH:SEARCH<x>:TRIGger:A:BUS? Queries the SEARCH:SE ARCH<x>:TRIGger:A:BUS settings.

2-62 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual