Agilent Technologies E1445A Manual do Utilizador descarregar pdf (Página 493)

100

101

Comments • To simplify the program, SCPI commands are included to select the

reference oscillator, the DDS subsystem, and to start the waveform.

This requires that the only registers written to be the Phase

Increment and Frequency Load Strobe Registers. This program

executes as intended when the SCPI commands in subprogram

Output_function are executed before the registers are written to.

• The subprogram Output_function sets the initial reference oscillator

frequency to 42.94967296 MHz. If a different reference oscillator

frequency is used (that is, 40 MHz or an externally supplied

oscillator), specify that frequency when the Freq_change subprogram

is called (line 200).

• If frequency doubling is in effect (SOUR:FREQ1:RANG command in

subprogram Output_function), the doubled frequency can be changed to

another doubled frequency by passing a number other than 0 as the

fourth parameter to the Freq_change subprogram (line 200).

• Note the following when specifying the number of waveform points

(Npts value passed to the Freq_change subprogram): sine waves and

arbitrary waveforms, Npts = 1; square waves, Npts = 4; ramp and

triangle waves, Npts =

RAMP:POINts value.

Visual BASIC and

Visual C/C++ Program

Versions

The Visual BASIC example program, FREQ1REG.FRM, is in directory

“ VBPROG” and the Visual C example program, FREQ1REG.C, is in

directory “VCPROG” on the CD that came with your Agilent E1445A.

Appendix C Register-Based Programming 491

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