240 Agilent InfiniiVision 5000 Series Oscilloscopes Programmer's Reference
3Commands by Subsystem
:MEASure:SOURce
(see page 530)
Command Syntax :MEASure:SOURce <source1>[,<source2>]
<source1>,<source2> ::= {CHANnel<n> | FUNCtion | MATH}
<n>::={1|2|3|4}forthefour channel oscilloscope models
<n> ::= {1 | 2} for the two channel oscilloscope models
The :MEASure:SOURce command sets the default sources for
measurements. The specified sources are used as the sources for the
MEASure subsystem commands if the sources are not explicitly set with
the command. If a source is specified for any measurement, the current
source is changed to this new value. If :MARKer:MODE is set to OFF or
MANual, setting :MEASure:SOURce to CHANnel<n>, FUNCtion, or MATH
will also set :MARKer:X1Y1source to source1 and :MARKer:X2Y2source to
source2.
Query Syntax :MEASure:SOURce?
The :MEASure:SOURce? query returns the current source selections. If
source2 is not specified, the query returns "NONE" for source2. If all
channels are off, the query returns "NONE,NONE". Source2 only applies to
:MEASure:DELay and :MEASure:PHASe measurements.
Return Format <source1>,<source2><NL>
<source1>,<source2> ::= {CHAN<n> | FUNC | NONE}
See Also: •"Introduction to :MEASure Commands" on page 218
•":MARKer:MODE" on page 205
•":MARKer:X1Y1source" on page 207
•":MARKer:X2Y2source" on page 209
•":MEASure:DELay" on page 225
•":MEASure:PHASe" on page 234
Example Code ' MEASURE - The commands in the MEASURE subsystem are used to make
' measurements on displayed waveforms.
myScope.WriteString ":MEASURE:SOURCE CHANNEL1" ' Source to measure.
myScope.WriteString ":MEASURE:FREQUENCY?" ' Query for frequency.
varQueryResult = myScope.ReadNumber ' Read frequency.
MsgBox "Frequency:" + vbCrLf _
+ FormatNumber(varQueryResult / 1000, 4) + " kHz"
myScope.WriteString ":MEASURE:DUTYCYCLE?" ' Query for duty cycle.
NOTE MATH is an alias for FUNCtion. The query will return FUNC if the source is FUNCtion or
MATH.