MDO3000 Programmer Manual.pdf - 第470页

Commands Listed in A lphabetical Order HIGH measures t he High reference (100% level, sometimes called T opline) of a waveform. This measurement is app licable only to the analog channels. HITS (histogram hits) measur es…

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Commands Listed in Alphabetical Order
Group
Measurement
Syntax
MEASUrement:MEAS<x>:TYPe
{AMPlitude|AREa|BURst|CARea|CMEan|CRMs|DELay|FALL|FREQuency
|HIGH|HITS|LOW|MAXimum|MEAN|MEDian|MINImum|NDUty|NEDGECount
|NOVershoot|NPULSECount|NWIdth|PEAKHits|PDUty|PEDGECount|PER Iod
|PHAse|PK2Pk|POVershoot|PPULSECount|PWIdth|RISe|RMS|SIGMA1|S IGMA2
|SIGMA3|STDdev|TOVershoot|WAVEFORMS}
MEASUrement:MEAS<x>:TYPe?
Arguments
AMPlitude measures the amplitude of the selected waveform. In other words, it
measures the high value less the low value measured over the entire waveformor
gated region. This measurement is applicable only to the analog channels.
Amplitude = High - Low
AREa measures the voltage over time. The area is over the entire waveform or
gated region and is measured in volt-seconds. The area measured above the
ground is positive, while the area below ground is negative. This measurement is
applicable only to the analog channels.
BURst measures the duration of a burst. The measurement is made over the entire
waveform or gated region.
CARea (cycle area) measures the voltage over time. In other words, it measures, in
volt-seconds, the area over the first cycle in the waveform or the first cycle in the
gated region. The area measured above the common reference point is positive,
while the area below the common reference point is negative. This measurement
is applicable only to the analog channels.
CMEan (cycle mean) measures the arithmetic mean over the first cycle in the
waveform or the first cycle in the gated region. This measurement is applicable
only to the analog channels.
CRMs (cycle rms) measures the true Root Mean Square voltage over the first
cycle in the waveform or the first cycle in the gated region. This measurementis
applicable only to the analog channels.
DELay measures the time between the middle reference (default = 50%) amplitude
point of the source waveform and the destination waveform. This measurement is
applicable only to the analog channels.
FALL measures the time taken for the falling edge of the first pulse in the
waveform or gated region to fall from a high reference value (default is 90%)to
a low reference value (default is 10%). This measurement is applicable only
to the analog channels.
FREQuency measures the first cycle in the waveform or gated region. Frequency
is the reciprocal of the period and ismeasuredinhertz(Hz),where1Hz=1
cycle per second.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-439
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