MDO3000 Programmer Manual.pdf - 第457页

Commands Listed in Alphabetical Order PEAKHits measu res 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, expre ssed as …

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Commands Listed in Alphabetical Order
DELay measures
the time between the middle reference (default = 50%) amplitude
point of the source waveform and the destination waveform.
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 is measured in hertz (Hz), where 1 Hz = 1
cycle per second.
HIGH measures the 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
measure
ment 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
measu
rement 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 falling 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%)
NP
ULSECount
is the count of negative pulses.
NWIdth (negative width) measurement is the distance (time) between the middle
reference (default = 50%) amplitude points of a negative pulse. The measurement
is made on the first pulse in the waveform or gated region.
2-426 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
PEAKHits measu
res 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, expre
ssed as a percentage. It is measured on the first cycle in the
waveform or gated region.
Positive Du
ty Cycle = ((Positive Width)/Period) × 100%
PEDGECount is the count of rising 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.
PHAse measures the phase difference (amount of time a waveform leads or lags
the reference waveform) between two waveforms. The measurement is made
between t
he middle reference points of the two waveforms and is expressed in
degrees, where 360° represents one waveform cycle.
PK2Pk (p
eak-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%
PPUL
SECount
is the count of positive pulses.
PWIdth (positive width) is the distance (time) between the middle reference
(de
fault = 50%) amplitude points of a positive pulse. The measurement is made
on the first pulse in the waveform or gated region.
RI
Se
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.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-427
Commands Listed in Alphabetical Order
TOVershoot (to
tal overshoot) (MDO models only) measures the sum of the
positive and negative overshoot value over the entire waveform or gated region.
This measurement is applicable only to the analog channels.
WAVEFORMS (waveform count) measures the number of waveforms used to
calculate the histogram.
Examples
MEASUREMENT:IMMED:TYPE FREQUENCY defines the immediate measurement to
be a frequency measurement.
MEASUREMENT:IMMED:TYPE? might return :MEASUREMENT:IMMED:TYPe RMS
indicating that the immediate measurement is the true Root Mean Square voltage.
MEASUrement:IMMed:UNIts? (Query Only)
Returns a string containing the units of the immediate measurement.
Group
Measurement
Syntax
MEASUrement:IMMed:UNIts?
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
2-428 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual