Agilent Technologies Infiniium 90000 Q-Series, Programmer'S Manual

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500 Agilent Infiniium 90000 Series Oscilloscopes Programmer's Reference
25
Measure Commands
:MEASure:CLOCk:METHod:EDGE
Command
:MEASure:CLOCk:METHod:EDGE {RISing | FALLing | BOTH}
The :MEASure:CLOCk:METHod:EDGE command specifies which edge(s) of
the data are used to recover a clock. (In the front panel GUI, this control
appears in the Advanced Clock Recovery dialog box.) Normally, both edges
are used. However, if you are performing clock recovery on a low duty
cycle clock signal, for example, you may want to use just the rising or
falling edge.
This command applies to the following clock recovery methods:
• FIXed (Constant Frequency).
• FOPLL (First Order PLL).
• SOPLL (Second Order PLL).
• EXPlicit (Explicit Clock).
• EXPFOPLL (Explicit First Order PLL).
• EXPSOPLL (Explicit Second Order PLL).
• EQFOPLL (Equalized First Order PLL).
• EQSOPLL (Equalized Second Order PLL).
To measure jitter on only rising (or falling) edges of a clock, you must also
set :MEASure:RJDJ:EDGE to the same RISing or FALLing option, and you
must set :MEASure:RJDJ:CLOCk ON to force the pattern to be a clock and
set the jitter for edges not examined to zero (0).
Example This example specifies that both rising and falling edges of the data are
used to recover a clock.
myScope.WriteString ":MEASure:CLOCk:METHod:EDGE BOTH"
Query
:MEASure:CLOCK:METHod:EDGE?
The :MEASure:CLOCk:METHod:EDGE? query returns the clock recovery
method's edge setting.
Returned Format
[:MEASure:CLOCk:METHod:EDGE] {RIS | FALL | BOTH}
Example
This example places the current edge setting of the clock recovery method
in the variable strSetting, then prints the contents of the variable to the
computer's screen.
N O T E
:MEASure:CLOCk commands are available when clock recovery is used by licensed
software (like the E2688A High Speed Serial software or the N5400A/N5401A EZJIT Plus
jitter analysis software).