MDO3000 Programmer Manual.pdf - 第471页

Commands Listed in Alphabetical Order PHAse measure s the phase difference (amount of time a waveform leads or lags the refe rence waveform) between two waveforms. The measurement is made between the middle reference poi…

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Commands Listed in Alphabetical Order
HIGH measures t
he High reference (100% level, sometimes called Topline) of a
waveform. This measurement is applicable only to the analog channels.
HITS (histogram hits) measures the number of points in or on the histogram box.
LOW measures the Low reference (0% level, sometimes called Baseline) of a
waveform. This measurement is applicable only to the analog channels.
MAXimum finds the maximum amplitude. This value is the most positive peak
voltage found. It is measured over the entire waveform or gated region. This
measurement is applicable only to the analog channels.
MEAN amplitude measurement finds the arithmetic mean over the entire waveform
or gated region. This measurement is applicable only to the analog channels.
MEDian (histogram measurement) measures the middle point of the histogram
box. Half of all acquired points within or on the histogram box are less than this
value and half are greater than this value.
MINImum finds the minimum amplitude. This value is typically the most negative
peak voltage. It is measured over the entire waveform or gated region. This
measurement is applicable only to the analog channels.
NDUty (negative duty cycle) is the ratio of the negative pulse width to the signal
period, expressed as a percentage. The duty cycle is measured on the first cycle in
the waveform or gated region.
Negative Duty Cycle = ((Negative Width) / Period) × 100%
NEDGECount is the count of negative edges.
NOVershoot (negative overshoot) finds the negative overshoot value over the
entire waveform or gated region. This measurement is applicable only to the
analog channels.
Negative Overshoot = ((Low - Minimum) / Amplitude) × 100%)
NPULSECount is the count of negative pulses.
NWIdth (negative width) measurement is the distance (time) between the middle
reference (defa
ult = 50%) amplitude points of a negative pulse. The measurement
is made on the first pulse in the waveform or gated region.
PEAKHits measures the number of points in the largest bin of the histogram.
PDUty (positive duty cycle) is the ratio of the positive pulse width to the signal
period, expressed as a percentage. It is measured on the first cycle in the
waveform or gated region.
Positive Duty Cycle = ((Positive Width)/Period) × 100%
PEDGECount is the count of positive edges.
PERIod is the time required to complete the first cycle in a waveform or gated
region. Period is the reciprocal of frequency and is measured in seconds.
2-440 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
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