MDO3000 Programmer Manual.pdf - 第478页

Commands Listed in A lphabetical Order MEASUrement: REFLevel:METHod Specifies or r eturns the reference lev el units used for measurement calcul ations. NOTE. this command affects the associated r efer ence level paramete…

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Commands Listed in Alphabetical Order
Arguments
<NR3> is a floati
ng point number that specifies the low reference level, in volts.
The default is 0.0 V.
Examples
MEASUREMENT:REFLEVEL:ABSOLUTE:LOW 0.0 sets the low reference level
to 0.0 V.
MEASUREMENT:REFLEVEL:ABSOLUTE:LOW? might return
:MEASUREMENT:REFLEVEL:ABSOLUTE:LOW 0.0000E+00 indicating
that the absolute low reference level is set to 0.0 V.
MEASUrement:REFLevel:ABSolute:MID<x>
This command specifies an absolute mid reference level (the 50% reference level)
for the "to" waveform when taking a delay measurement, in volts. There are
two absolute mid reference levels; thus MID<x> can either be MID1 or MID2.
This command applies when MEASUrement:REFLevel:METHod has been set
to Absolute. This command is equivalent to setting the Reference Levels in the
MEASURE menu on the oscilloscope front panel.
NOTE. This command affects the results of period, frequency, delay, and all cyclic
measurements. This command affects the associated reference level parameter for
all MEASurements:IMMed and the four periodic measurements.
Group
Measurement
Syntax
MEASUrement:REFLevel:ABSolute:MID<x> <NR3>
MEASUrement:REFLevel:ABSolute:MID<x>?
Related Commands
MEASUrement:REFLevel:METHod
Arguments
<NR3> is a floating point number that specifies the mid reference level in volts.
Examples
MEASUrement:REFLevel:ABSolute:MID 0.5 sets the absolute MID1
reference level for the delay waveform to 0.5 V.
MEASUrement:REFLevel:ABSolute:MID? might return
:MEASUREMENT:REFLEVEL:ABSOLUTE:MID2 0.5000E+00 indicating that the
absolute MID2 reference level is set to 0.5 V.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-447
Commands Listed in Alphabetical Order
MEASUrement:
REFLevel:METHod
Specifies or returns the reference level units used for measurement calculations.
NOTE. this command affects the associated reference level parameter
for all MEAS
urements:IMMed and the eight periodic measurements (4 in
MDO3000). To change the parameter for individual measurements, use the
MEASUrement:MEAS<x>:REFLevel commands.
Group
Measurement
Syntax
MEASUrement:REFLevel:METHod {ABSolute|PERCent}
MEASUrement:REFLevel:METHod?
Arguments
ABSolute specifies that the reference levels are set explicitly using the
MEASUrement:REFLevel:ABSolute commands. This method is useful when
precise values are required (for example, when
designing to published interface
specifications, such as RS-232-C).
PERCent specifies that the reference levels ar
e calculated as a percent
relative to HIGH and LOW. The percentages are defined using the
MEASUrement:REFLevel:PERCent commands.
Examples
MEASUREMENT:REFLEVEL:METHODABSOLUTE specifies that explicit user-defined
values are used for the reference levels.
MEASUREMENT:REFLEVEL:METHOD? might return
:MEASUREMENT:REFLEVEL:METHOD PERCENT indicating that the reference
level units used are calculated as a percent relative to HIGH and LOW.
MEASUrement:REFLevel:PERCent:HIGH
This command specifies the percent (where 100% is equal to HIGH) used to
calculate the high reference level when MEASUrement:REFLevel:METHod is set
to Percent. This command affects the results of rise and fall measurements.
NOTE. This command affects the associated reference level parameter for all
MEASurements:IMMed and the four periodic measurements.
Group
Measurement
2-448 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Commands Listed in Alphabetical Order
Syntax
MEASUrement:R
EFLevel:PERCent:HIGH <NR3>
MEASUrement:REFLevel:PERCent:HIGH?
Related Commands
MEASUrement:REFLevel:METHod,
MEASUrement:IMMed:TYPe,
MEASUrement:MEAS<x>:TYPe
Arguments
<NR3> is a floating point number that specifies the high reference level, ranging
from 0 to 100%. The default high reference level is 90%.
Examples
MEASUREMENT:REFLEVEL:PERCENT:HIGH95 sets the high reference level to
95% of HIGH.
MEASUREMENT:REFLEVEL:PERCENT:HIGH? might return
:MEASUREMENT:REFLEVEL:PERCENT:HIGH 90 indicating that the
percentage high reference level is set to 90% of HIGH.
MEASUrement:REFLevel:PERCent:LOW
This command specifies the percent (where 100% is equal to HIGH) used to
calculate the low reference level when MEASUrement:REFLevel:METHod is set
to Percent. This command affects the results of rise and fall measurements.
NOTE. this command affects the associated reference level parameter for a ll
MEASurements:IMMed and the periodic measurements.
Group
Measurement
Syntax
MEASUrement:REFLevel:PERCent:LOW <NR3>
MEASUrement:REFLevel:PERCent:LOW?
Related Commands
MEASUrement:REFLevel:METHod,
MEASUrement:IMMed:TYPe,
MEASUrement:MEAS<x>:TYPe
Arguments
<NR3> is a floating point number that speci
fies the low reference level, ranging
from 0 to 100%. The default low reference level is 10%.
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual 2-449