User`s manual

Generating Square Waves

The SQUWAVE program outputs a square wave at 1 Mhz, 4 V output level,

and +1 V offset. The commands are:

1. Reset the AFG

*RST

This command aborts any waveform output and selects the 42.9 MHz

reference oscillator source, DDS sample source (that is, trigger start

source), sinusoid function, arm start immediate, 0 V offset, and a 50 Ω

output impedance and output load.

2. Select the Reference Oscillator

[SOURce:]ROSCillator:SOURce INTernal[1]

This command selects the reference oscillator source (see “Reference

Oscillator Sources” on page 78). (Although

*RST selects 42.9 MHz

reference oscillator, it is selected here for good programming practice.)

3. Select the Sample Source

TRIGger:STARt:SOURce INTernal[1]

This command selects the sample source (that is, trigger start source).

(Although

*RST selects trigger start source that selects the DDS

frequency generator, it is selected here for good programming

practice.) The SQUare function can use any of the trigger start

sources (see “Sample Sources” on page 78).

4. Set the Frequency Range

[SOURce:]FREQuency[1]:RANGe <range>

This command specifies the square wave upper frequency limit (see

“DDS Frequency Generator Ranges” on page 79). (Since

*RST

automatically sets the range to the lower range, it is executed in this

program for good programming practice.)

Chapter 2 Generating Standard Waveforms 61