MDO3000 Programmer Manual.pdf - 第1090页

Appendix D: W aveform T ransfer (WFMOutpre and CUR V e Query) Examples NOTE. The retur ned hexadecimal data values for the Digital Collection ar e formatted without leading zer oes. For ex ample, a 4-byte digital collect…

Appendix D: Waveform Transfer (WFMOutpre and CURVe Query) Examples

WFMOutpre? Q uery results

Explanation

YUNIT “State”

This value indicates the vertical units of data points in the waveform record. This can be

any of several string values, depending upon the vertical units of the source waveform –

in this case, S

tate. This is query only. (If you would like to determine only this value, use

the WFMOutpre:YUNit? query.)

YMULT 1.0000

This value indicates the multiplying factor to c onvert the data point values from digitizing

levels to the units speciﬁed by the

WFMOUTpre:YUNit command. This is query only. (If

you would li

ke to determine only this value, use the WFMOutpre:YMUlt? query.)

YOFF 0.0E+0

This value i

ndicates the vertical position of the source waveform in digitizing levels. There

are 25 digitizing levels per vertical division. This is query only. (If you would like to determine

only this value, use the WFMOutpre:YOFf? query.)

YZERO 0.0E+0

This value indicates the vertical offset of the source waveform in units speciﬁed by the

WFMOUTpr

e:YUNit

command. This is query only. (If you would like to determine only

this value, use the WFMOutpre:YZEro? query.)

Example

3: The Digital Collection with 4 Bytes Per P oint and MagniVu Off

Goal: Transfer 25 points of Digital Collection data from the oscilloscope to a PC

using 4 bytes per point and MagniVu off.

Command Comment

:DATa:SOUrce DIGita l

:ACQuire:MAGnivu 0

:DATa:START 1

:DATa:STOP 25

:WFMOutpre:ENCdg ASCii

:WF

MOutpre:BYT_Nr 4

:HEADer 1

:VERBose 1

FMOutpre?

Returns the following values. Each v alue represents the current settings that

CURVe? query will use to format the data that will be transferred from the

scilloscope to a PC or other device (see next table for explanations):

:WFMOUTPRE:BYT_NR 4;BIT_NR 32;ENCDG ASCII;BN_FMT

RI;BYT_OR MSB;WFID "Digital, unknown coupling,

00.0us/div, 10000 points, Digital mode";NR_PT 25;PT_FMT

Y;PT_ORDER LINEAR;XUNIT "s";XINCR 100.0000E-9;XZERO

-500.0000E-6;PT_OFF 0;YUNIT "State";YMULT 1.0000;YOFF

0.0E+0;YZERO 0.0E+0

:CURVe?

Returns the following values. Each value represents a data point:

:CURVe

FB386,FB366,FB3E6,FB366,FB3E6,FB32E,FB3A2,F B32E,FB3AA,FB366,

FB3EA,FB366,FB3E2,FB36,FB3E6,FB366,FB3E6,FB 346,FB3C6,FB346,FB3C6,

FB34E,FB3C2,FB34E,FB3CA

MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual D-5

Appendix D: Waveform Transfer (WFMOutpre and CURVe Query) Examples

NOTE. The retur

ned hexadecimal data values for the Digital Collection are

formatted without leading zeroes. For example, a 4-byte digital collection value

of FB386 should be interpreted as 000FB386.

NOTE. You can also use the

WAVFrm?

query, which concatenates the

WFMOutpre?

and

CURVe?

queries.

WFMOutpre? Q uery results

Explanation

WFMOUTPRE:BYT_NR 4

This value speciﬁes the number of bytes per data point in the waveform data. To change

this value automatically, use the WFMOutpre:B YT_Nr command. Note that changing this

value automatically changes the

BIT_NR value accordingly. (This value can also be set

using the DATa:WIDth command.)

BIT_NR 32

This value speciﬁes the number of bits per data point in the waveform data. To change this

value, use the WFMOutpre:BIT_Nr command. Note that changing this value automatically

changes the

BYT_NR value accordingly.

ENCDG ASCII

This value s peci ﬁes the encoding of the waveform data. To change this value ( the

other possibility is BINARY), use the WFMOutpre:ENCdg command. (This value can

also be set using the DATa:ENCdg command, which provides the ability to set the

WFMOutpre:ENCdg, W FMOutpre:BN_Fmt,: and WFMOutpre:BYT_Or values

using a single command.)

BN_FMT RI

This v a lue speciﬁes the binary format, which in this case is RI (signed integer). To change

this value ( the other possibility is RP or positive integer), use the WFMOutpre:BN_Fmt

command. Note: this ﬁeld is not applicable for ASCii encoding.

BYT_OR MSB

This value speciﬁes the byte order for the BINARY encoding, which in this case is MSB

(most signiﬁcant byte ﬁrst, also known as IBM format). To change this value to LSB, use the

WFMOutpre:BYT_Or command. Note: this ﬁeld is not applicable for AS Cii encoding.

WFID

"Digital, unknown

coupling, 100.0us/div,

10000 points, Digital

mod

This quoted string represents information about the source waveform that would be returned

by a.

WFMOutpre:WFId? query. It cannot be changed.

NR_PT 25

is value indicates the number of data points in the waveform record to be transferred

using the CURVE? query. (If y ou would like to determine only this v alue, use the

WFMOutpre:NR_Pt? query.) Note: this value is typically equal to the full record length,

t y ou also have the option to transfer only a portion of the record length by using the

DATa:STARt and DATa:STOP commands.

T_FMT Y

This value indicates the format of the data points in the waveform record. In this case,

the value represents YT format. This is query only – the returned values can be Y for YT

ormat or ENV for envelope format (min/max pairs). (If you would like to determine only this

value, use the WFMOutpre:PT_Fmt? query.)

PT_ORDER LINEAR

This value is always LINear.

XUNIT “s”

This value indicates the units of the x-axis of the waveform record. This is determined by the

horizontal settings for the waveform source. For live channels, this value is “s”, representing

seconds. When using the math waveform as a source, the value can be “s” or “Hz”. This

is query only. (If you would like to determine only this value, use the WFMOutpre:XUNit?

query.)

D-6 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual

Appendix D: Waveform Transfer (WFMOutpre and CURVe Query) Examples

WFMOutpre? Query results

Explanation

XINCR 100.000

0E-9

This value indicates the time, in seconds, or frequency, in hertz, between data points in the

waveform record. This is query only. (If you would like to determine only this value, use

the WFMOutpre

:XINcr? query.)

XZER0 -500.0000E-6

This v alue in

dicates the time, in seconds, or frequency, in hertz, of the ﬁrst data point in the

waveform record. This time or frequency is relative to the time of the trigger, which is always

0. So, this XZEro time or frequency can be negative. This is query only. (If you would like to

determine o

nly this value, use the WFMOutpre:XZEro? query.)

PT_OFF 0

This is a que

ry provided only for compatibility with performance oscilloscopes. The

returned value is always 0. ( If you would like to determine only this value, use the

WFMOutpre:PT_Off? query.)

YUNIT “State”

This value indicates the vertical units of data points in the waveform record. This can be

any of sev

eral string values, depending upon the vertical units of the source waveform –

in this case, State. This is query only. (If you would like to determine only this value, use

the WFMOutpre:YUNit? query.)

YMULT 1.0000

This value indicates the multi plyi ng factor to convert the data point values from digitizing

levels t

o the units speciﬁed by the

WFMOUTpre:YUNit command. This is query only. (If

you would like to determine only this value, use the WFMO utpre:YMUlt? query.)

YOFF 0.

0E+0

This value indicates the vertical position of the source waveform in digitizing levels. There

are 25 digitizing levels per vertical division. This is query only. (If you would like to determine

only th

is value, use the WFMOutpre:Y OFf? query.)

YZERO 0.0E+0

This v

alue indicates the vertical offset of the source waveform in units speciﬁ ed by the

WFMOUTpre:YUNit command. This is query only. (If you would like to determine only this

value, use the WFMOutpre:YZEro? query.)

Example 4: The Digital Collection with 8 Bytes Per Point and MagniVu Off

Goal

: Transfer 25 points of Digital Collection data from the oscilloscope to a PC

using 8 bytes per point and MagniVu off.

Command Comment

ATa:SOUrce DIGital

:ACQuire:MAGnivu 0

:DATa:START 1

:DATa:STOP 25

:WFMOutpre:ENCdg ASCii

:WFMOutpre:BYT_Nr 8

:HEADer 1

:VERBose 1

MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual D-7