MDO3000 Programmer Manual.pdf - 第469页

Commands Listed in Alphabetical Order Group Measurement Syntax MEASUrement:M EAS<x>:TYPe {AMPlitude|AR Ea|BURst|CARea|C MEan|CRMs|DELay| FALL|FREQuency |HIGH|HITS|LO W|MAXimum|MEAN|M EDian|MINImum|ND Uty|NEDGECount…

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Commands Listed in Alphabetical Order
Syntax
MEASUrement:M
EAS<x>:STATE {OFF|ON|<NR1 >}
MEASUrement:MEAS<x>:STATE?
Related Commands
MEASUrement:
MEAS<x>:SOUrce<x>,
MEASUrement:MEAS<x>:TYPe
Arguments
OFF disables calculation and display of the specified measurement slot.
ON enables calculation and display of the specified measurement slot.
<NR1> = 0 disables calculation and display of the specified measurement slot; any
other value enables calculation and display of the specified measurement slot.
Examples
MEASUREMENT:MEAS2:STATE ON computes and displays the measurement
defined as measurement 2.
MEASUREMENT:MEAS1:STATE? might return :MEASUREMENT:MEAS1:STATE 0
indicating that measurement defined for measurement slot 1 is disabled.
MEASUrement:MEAS<x>:STDdev? (Query Only)
Returns the standard deviation of values accumulated for this measurementsince
the last statistical reset. Measurements are specified by <x>, the measurement
slots, from 1 through 8.
Group
Measurement
Syntax
MEASUrement:MEAS<x>:STDdev?
Examples
MEASUREMENT:MEAS1:STDDEV? might return :MEASUREMENT:ME AS1:STDDEV
21.0E-12.
MEASUrement:MEAS<x>:TYPe
This command specifies the measurement type defined for the specified
measurement slot. The measurement slotisspecifiedby<x>,whichrangesfrom
1 through 8 in all models except MDO3000, which only support 4 simultaneous
measurements.
Digital channel measurements do not have a user-settable midRef threshold. If
you specify a digital channel measurement that is not available, measurement
error 2200: measurement system error occurs and 9.9e37 is returned.
2-438 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
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