MDO3000 Programmer Manual.pdf - 第67页

Command Groups T able 2-33: Measurement Commands (cont.) Command Description MEASUrement:IMMed:DELay? Returns information about the immediate delay measurement MEASUrement:IMMed:DELay: DIRectio n This command speci ﬁ es …

Command Groups

Measurement C

ommand Group

Use the commands in the Measurement Command Group to control the automated

measurement system.

Up to eight automated measurements can be displayed on the screen. In the

commands, these measurement readouts are named MEAS<x>, where <x> is the

measurement number.

In addition to the eight displayed measurements, the measurement commandslet

you specify an additional measurement, IMMed. The immediate measurement

has no front-panel equivalent. Immediate measurements are never displayed.

Because they are computed only when needed, immediate measurements slow the

waveform update rate less than displayed measurements.

To obtain measurement results, use the MEASUrement:MEAS<x>:VALue?

query for displayed results or the MEASUrement:IMMed:VALue? query for

immediate measurements.

Measurement commands can set and query measurement parameters. You

can assign some parameters, such as waveform sources, differently for each

measurement. Other parameters, such as reference levels, have only one value,

which applies to all measurements.

Readout values for t

he 8 displayed measurements are updated periodically. As

such, queries of these measurement values may return 9.91E+37, which represents

NaN (not a number) and a measurement warning event (e.g. 2225. “Measurement

error. No waveform to measure”) when the measurement is not yet computed.

Immediate measurement queries will return values once the measurement has

been computed.

Example of Immediate

Measurements

An example command sequence follows that illustrates immediate measurements

of Cycle Mean on channel 1:

:MEASUrement:IMMed:SOUrce1 CH1

:MEASUrement:IMMed:TYPe CMEan

:MEASUrement:IMMed:VALue? -18.5568E-3

:MEASUrement:IMMed:VALue?;VALue?;VALue?

-21.6400E-3;-23.8023E-3;-21.0064E-3

Table 2-33: Measurement Commands

Command

Description

MEASUrement?

Returns all measurement parameters

MEASUrement:CLEARSNapshot

Removes the measurement snapshot display

MEASUrement:GATing This command speciﬁes the measurement gating

MEASUrement:IMMed?

Returns all immediate measurement setup parameters

2-36 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual

Command Groups

Table 2-33: Measurement Commands (cont.)

Command

Description

MEASUrement:IMMed:DELay? Returns information about the immediate delay measurement

MEASUrement:IMMed:DELay:

DIRection

This command speciﬁes the search direction to use for immediate delay measurements

MEASUrement:IMMed:DELay:

EDGE<x>

This command speciﬁes the slope of the edge used for immediate delay “from” and “to”

waveform measurements

MEASUrement:IMMed:SO Urce<x> This command speciﬁes the “from” source for all single channel immediate measurements

This command speciﬁes the source to measure “to” for two-channel measurements

MEASUrement:IMMed:TYPe This command speciﬁes the type of the immediate measurement

MEASUrement:IMMed:UN Its? Returns the units of the i mmediate measurement

MEASUrement:IMMed:VALue? Returns the value of the immediate measurement

MEASUrement:INDICa tors?

Returns all measurement indicator parameters

MEASUrement:INDICa tors:

HORZ<x>?

Returns the position of the speciﬁed horizontal measurement indicator

MEASUrement:INDICa tors:

NUMHORZ?

Returns the number of horizontal measurement indicators currently being displayed

MEASUrement:INDICa tors:

NUMVERT?

Returns the number of vertical measurement indicators currently being displayed

MEASUrement:INDIC ators:STATE This command speciﬁes the state of visible m easurement indicators

MEASUrement:INDICa tors:

VERT<x>?

Returns the value of the speciﬁed vertical measurement indicator

MEASUrement:MEAS<x>?

Returns all measurement parameters

MEASUrement:MEAS<x>:COUNt? Returns the number of values accumulated since the last statistical reset

MEASUrement:MEAS<x>:DELay? Returns the delay measurement parameters for the speciﬁed measurement

MEASUrement:MEAS<x>:DELay:

DIRection

This command speciﬁes the search direction to use for delay measurements

MEASUrement:MEAS<x>:DELay:

EDGE<x>

This command speciﬁes the slope of the edge to use for delay “from” and “to” waveform

measurements

MEASUrement:MEAS<x>:

MAXimum?

Returns the maximum value found since the last statistical reset

MEASUrement:MEAS<x>:MEAN?

Returns the mean value accumulated since the last statistical reset

MEASUrement:MEAS<x>:

MINImum?

Returns the minimum value found since the last statistical reset

MEASUrement:MEAS<x>:

SOUrce<x>

This command speciﬁes the “from” source for all single channel immediate measurements

This command speciﬁes the source to measure “to” for two-channel measurements

MEASUrement:MEAS<x>:STATE This command speciﬁes whether the speciﬁed measurement slot is computed and displayed

MEASUrement:MEAS<x>:STDdev? Returns the standard deviation of values accumulated since the last statistical reset

MEASUrement:MEAS<x>:TYPe This command speciﬁes the measurement<x> type

MEASUrement:MEAS<x>:UNIts?

Returns measurement<x> units

MEASUrement:MEAS<x>:VALue? Returns the value of measurement<x>

MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-37

Command Groups

Table 2-33: Measurement Commands (cont.)

Command

Description

MEASUrement:METHod This command speciﬁes the method used for calculating reference levels

MEASUrement:REFLevel? Returns the current reference level parameters

MEASUrement:REFLevel:ABSolute:

HIGH

This command speciﬁes the top reference level for rise time

MEASUrement:REFLevel:ABSolute:

LOW

This command speciﬁes the low reference level for rise time

MEASUrement:REFLevel:ABSolute:

MID<x>

This command speciﬁes the mid reference level for the speciﬁed channel in absolute volts

MEASUrement:REFLevel:METHod This command speciﬁes the method for assigning high and low reference levels

MEASUrement:REFLevel:PERCent:

HIGH

This command speciﬁes the top reference percent level for rise time

MEASUrement:REFLevel:PERCent:

LOW

This command speciﬁes the low reference percent level for rise time

MEASUrement:REFLevel:PERCent:

MID<x>

This command speciﬁes the mid reference level for the speciﬁed channel in percent

MEASUrement:STATIstics Clears or returns all of the statistics accumulated for all period m easurements (MEAS1

through MEAS4)

MEASUrement:STATIstics:MODe Turns measurement statistics on or off

MEASUrement:STATIstics:

WEIghting

Controls the responsiveness of the mean and standard deviation to waveform changes

Miscellaneous Command Group

Use the commands in the Miscellaneous Command Group to perform actions that

do not ﬁt into other categories.

Table 2-34: Miscellaneous Commands

Command

Description

APPLication:LICENSE:SLOT<x>:

LOCation?

This query returns the application license l ocation. < x> can be slot number 1–4.

APPLication:LICENSE:SLOT<x>:

TRANSFER

You can use this command to transfer an application license from the module to internal

memory in the oscilloscope, and transfer it back.

APPLication:LICENSE:SLOT<x>:

TYPe?

This query returns the application license type of the module that is currently inserted in the

speciﬁed application module slot.

APPLication:TYPe

When a m ask/limit or power test application module is installed, one of the associated test

types is always selected by default. This command allows the test type to be changed

from the default.

AUTOSet Sets the vertical, horizontal and trigger controls to provide a stable display of the appropriate

waveform. This is equivalent to pressing the front panel Autoset button

AUTOSet:ENAble Enables or disables the autoset feature

2-38 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual