MDO3000 Programmer Manual.pdf - 第455页

Commands Listed in Alphabetical Order Digital channe l measurements do not have a user-settable midRef threshold. If you specify a digital channel measureme nt that is not available on MSO/MDO400 0/B models (or MDO3000 a…

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Commands Listed in Alphabetical Order
Examples
MEASUREMENT:I
MMED:DELAY:EDGE1 RISE
specifies that the "from" waveform
rising edge be used for the immediate delay measurement.
MEASUREMENT:
IMMED:DELAY:EDGE1?
returns either RISE or FALL.
MEASUrement:IMMed:SOUrce<x>
For SOURce1: This command specifies the source for all single channel
measurements. For delay or phase measurements, this command specifies the
waveform to measure "from". This is equivalent to setting the "From:" waveform
in the "Measure Delay" side menu or the "Measure Phase" side menu. SOUrce is
equivale
nt to SOURCE1.
For SOUrce2: This command specifies the waveform to measure "to" when taking
adelaym
easurement or phase measurement. This is equivalent to setting the "To:"
waveform in the "Measure Delay" side menu or the "Measure Phase" side menu.
NOTE. If you do not specify a numerical suffix,thesourceisassumedtobe
SOUrce1.
Group
Measurement
Syntax
MEASUrement:IMMed:SOUrce<x>
{CH1|CH2|CH3|CH4|MATH|D0|D1|D2|D3|D4|D5|D6|D7|D8|D9|D10
|D11|D12|D13|D14|D15|HIStogram|RF_AMPlitude|RF_FREQuency|RF_ PHASe}
MEASUrement:IMMed:SOUrce<x>?
Arguments
CH1–CH4 is the analog channel to use as the source waveform.
MATH is the math waveform.
D0 — D15 is the digital waveform to use as the source waveform.
(MSO/MDO4000/B models only as well as MDO3000 and MDO400C models
with option MDO3MSO or MDO4MSO installed.)
HIStogram indicates the histogram as the object to be measured. HIStogram only
applies to SOUrce1; it is not available for SOUrce2.
RF_AMPlitude|RF_FREQuency|RF_PHASe are the RF time domain traces.
(MDO4000/B/C only.)
MEASUrement:IMMed:TYPe
This command specifies the immediate measurement type.
2-424 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
Digital channe
l measurements do not have a user-settable midRef threshold. If you
specify a digital channel measurement that is not available on MSO/MDO4000/B
models (or MDO3000 and MDO4000C models with the MDO3MSO or
MDO4MSO option installed), measurement error 2200: measurement system
error occurs and 9.91e37 (not a number) is returned.
Conditions
The TOVershoot (total overshoot) measurement is supported on MDO3000,
MDO4000/B, or MDO4000C models with option SA3 or SA6 only.
Group
Measurement
Syntax
MEASUrement:IMMed:TYPe
{AMPlitude|AREa|BURst|CARea|CMEan|CRMs|DELay|FALL|FREQuency
|HIGH|HITS|LOW|MAXimum|MEAN|MEDian|MINImum|NDUty|NEDGECount
|NOVershoot|NPULSECount|NWIdth|PEAKHits|PEDGECount|PDUty
|PERIod|PHAse|PK2Pk|POVershoot|PPULSECount|PWIdth|RISe|RMS
|SIGMA1|SIGMA2|SIGMA3|STDdev|TOVershoot|WAVEFORMS}
MEASUrement:IMMed: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.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-425
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