Agilent Technologies E1445A Manual de usuario descargar pdf (Pagina 146)

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101

Program Modifications To select another waveform, comment out (!) line 180 or 190 depending on

the waveform sequence (S1 or N1) you DO NOT want to output. You must

also comment out line 330 if line 180 is commented, or line 340 if line 190

is commented.

Visual BASIC and

Visual C/C++ Program

Versions

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

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

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

AC Output Leveling The SWP_LEVL program sets up a sine wave frequency sweep from 0 Hz

to 10 MHz and uses the AFG’s 10 MHz filter and AC output leveling to

maintain a constant amplitude over the span.

With the flowchart in Figure 4-1 as a guide, the steps of this program are:

1. Select the frequency sweep mode

[SOURce:]FREQuency[1]:MODE <mode>

2. Set the start frequency

[SOURce:]FREQuency[1]:STARt <start_freq>

3. Set the stop frequency

[SOURce:]FREQuency[1]:STOP <stop_freq>

4. Set the number of sweeps

[SOURce:]SWEep:COUNt <number>

5. Set the output function

[SOURce:]FUNCtion[:SHAPe] <shape>

6. Set the signal amplitude

[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude] <amplitude>

7. Select the output filter

OUTPut[1]:FILTer[:LPASs]:FREQuency <frequency>

8. Enable the output filter

OUTPut[1]:FILTer[:LPASs][:STATe] <mode>

9. Place the AFG in the wait-for-arm state

INITiate[:IMMediate]

144 Sweeping and Frequency-Shift Keying Chapter 4

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