Combining Parameters for Signal Generation Using the Agilent 81133A/81134A Pulse Generator
Agilent 81133A/81134A Pulse Generator User’s Guide, January 2005 73
Clock Sources
The selected clock source defines the time base from which all other
timing parameters are derived. You can select between:
•Internal
The clock is derived from the internal YIG oscillator.
•External
• e xternal 10 MHz reference (clock source); clock sources:external 10
MHz reference
Enable the external clock input (Clock In) to accept an external
clock signal that forms the time base. The frequenc y is measured
once by selecting the Measure function from t he user in terface or as
a remote SCPI command (
:MEASure:FREQuency?
).
This value is then used to calculate frequency-dependent values,
like the pulse width or the ph ase (available at the Channel page).
For more information about the Measure function, please refer to
the Online Help.
• Extern al 10 MHz Reference
• e xt. direct (clock source); clock sources:ext. direct
Enables the external clock input (Clock In) to apply a 10 MHz
reference clock. This clock is used as a reference for all timing
parameters.
• I nt. Direct/Ext. Direct
The direct modes allow changes of frequency without dropouts in
the range of 1:2. They are used for applic ations (precise clock
source) where dropouts would make a measurement impossible, for
example, PLL frequency sweeps and microprocessor clock sweeps.
Measure Function
Clock Source