MDO3000 Programmer Manual.pdf - 第472页

Commands Listed in A lphabetical Order MEASUrement: MEAS<x>:UNIts? (Query Only) Returns the units associated with the speciﬁed m easurement. The measurem ent slots are speciﬁed by <x>, which ranges from 1 thr…

Commands Listed in Alphabetical Order

PHAse measures

the phase difference (amount of time a waveform leads or lags

the reference waveform) between two waveforms. The measurement is made

between the middle reference points of the two waveforms and is expressed in

degrees, where 360° represents one waveform cycle.

PK2Pk (peak-to-peak) ﬁnds the absolute difference between the maximum and

minimum amplitude in the entire waveform or gated region. This measurementis

applicable only to the analog channels.

POVershoot is the positive overshoot value over the entire waveform or gated

region. This measurement is applicable only to the analog channels.

Positive Overshoot = ((Maximum - High) / Amplitude) ×100%

PPULSECount is the count of positive pulses.

PWIdth (positive width) is the distance (time) between the middle reference

(default = 50%) amplitude points of a positive pulse. The measurement is made

on the ﬁrst pulse in the waveform or gated region.

RISe timing measurement ﬁnds the rise time of the waveform. The rise time is

the time it takes for the leading edge of the ﬁrst pulse encountered to rise from a

low reference value (default is 10%) to a high reference value (default is 90%).

This measurement is applicable only to the analog channels.

RMS amplitude measurement ﬁnds the true Root Mean Square voltage in the

entire waveform or gated region. This measurement is applicable only to the

analog channels.

SIGMA1 (histogram measurement) measures the percentage of points in the

histogram that are within one standard deviation of the histogram mean.

SIGMA2 (histogram measurement) measures the percentage of points in the

histogram that are within two standard deviations of the histogram mean.

SIGMA3 (histogram measurement) measures the percentage of points in the

histogram that are within three standard deviations of the histogram mean.

STDdev measures the standard deviation (Root Mean Square (RMS) deviation) of

all acquired points within or on the histogram box.

TOVershoot (total overshoot) measures the sum of the positive and negative

overshoot value over the entire waveform or gated region. This measurementis

applicable only to the analog channels.

WAVEFORMS (waveform count) measures the number of waveforms used to

calculate the histogram.

Examples

MEASUREMENT:MEAS2:TYPE FREQUENCY deﬁnes measurement 2 as a

measurement of the frequency of a waveform.

MEASUREMENT:MEAS1:TYPE? might return :MEASUREMENT:MEAS1:TYPE RMS

indicating that measurement 1 is deﬁned to measure the RMS value of a waveform.

MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-441

Commands Listed in Alphabetical Order

MEASUrement:

MEAS<x>:UNIts? (Query Only)

Returns the units associated with the speciﬁed measurement. The measurement

slots are speciﬁed by <x>, which ranges from 1 through 8 (only 4 in

MDO3000 mode

ls).

Group

Measurement

Syntax

MEASUrement:MEAS<x>:UNIts?

Related Commands

MEASUrement:MEAS<x>:TYPe

Returns

This query returns one of the following strings.

Unit string Description

"%"

percent

"/Hz"

inverse hertz

"?"

indeterminate

"A"

amperes

"A/A"

amperes per ampere

"A/V"

amperes per volt

"A/W"

ampere per watt

"A/dB"

amperes per decibel

"A/s"

amperes per second

"AA" amperes squared

"AW"

ampere-watts

"AdB" ampere-decibels

"As" ampere-seconds

"B" bytes

"Hz" hertz

"IRE"

Institute of Radio Engineers units

"S/s"

samples per second

"V" volts

"V/A"

volts per ampere

"V/V"

volts per volt

"V/W"

volts per watt

"V/dB"

volts per decibel

"V/s"

volts per second

"VA" volt-amperes

2-442 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual

Commands Listed in Alphabetical Order

Unit string Description

"VAR" volt-amperes resistive

"VV" volts squared

"VW" volt-watts

"VdB" volts-decibels

"Vs" volt-seconds

"W"

watts

"W/A"

watts per am

pere

"W/V"

watts per volt

"W/W"

watts per

watt

"W/dB"

watt per decibel

"W/s"

watts per second

"WA"

watt-am

peres

"WV" watt-volts

"WW" watts s

quared

"WdB" watt-decibels

"Wfms" waveforms

"Ws" watt-seconds

"dB" decib

els

"dB/

decibels per ampere

"dB

/V"

decibels per volt

"dB

/W"

decibels per watt

B/dB"

decibels per decibel

"dBA" decibel-amperes

"dBV" decibel-volts

dBW"

ecibel-watts

"dBdB" decibels squared

"day" days

"degrees" degrees

"div" divi sions

"edges" edges

"hits" hits

"hr" hours

"joules" joules

"min" minutes

"ohms" ohms

"percent"

percent

"pulses" pulses

MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-443