If you want character of token number parts of an apparatus, can generate the signal of a need with pulse generator normally. But such low frequency applies small to resembling controller, you can use cheaper general function generator generation is low take sky comparing signal.
Today's general function generator is the signal cause that has numerous function, they use signal of direct complex number to produce program, can arise contain inside the weaveform of a variety of types of buy scanning and modulation and frequency. Some generator have the capacity that generates aleatoric weaveform more. Although be had commonly,extremely stable frequency is mixed very low lack fidelity, but suit generation not completely low the signal that takes sky comparing.
When arising to take empty example wave changeably with general function generator when you, occupy sky comparing normally limitation is 20% to 80% , enter with 1% paces. Another limitation is the bandwidth of function generator; Typical function generator can generate the square wave that amounts to 15MHz. Finite bandwidth is caused rise to be 20ns about with decay time - - accordingly the smallest pulse width is 40ns.
How does introduction of this application guideline use random of general function ／ of undee generator dash forward wave the square wave that produces capacity output to have patulous time-interval, in order to arise low the pulse that takes sky comparing.
To the specification of each measure
You can use what a lot of function generator have today dash forward generation of wave mode ability is low take sky comparing pulse, the width that needs short pulse for corresponding place from the periodic setting square wave begins. Because square wave is successive, need has " anthology " the method of signal. We attach most importance to generator setting a cycle that recrudesce sends square wave or dash forward wave, the frequency with extremely low square wave is equivalent to needs pulse interval.
Understand this one process to make you clear, we with Agilent 33120A
Undee generator is function ／ random exemple. Every 200s wants to produce the pulse of a 1s in this one example, occupy sky comparing accordingly for 0.5% .
Before begin need is calculated first have 1s pulse width (namely 2s is periodic) square wave frequency. This periodic reciprocal namely the frequency of 500kHz. It is setting of function generator output this frequency.
Because our target is every 200s,an arteries and veins conflicts wave is undee, its reciprocal is the repetition rate of 5kHz. This also is called dash forward wave rate (see a picture 1) .
The first pace, install pulse
Choose square wave function above all, the output range that sets pulse is 1Vpp. Install corresponding frequency by pulse width then. Press the computation before us, the frequency of 2s cycle is 500kHz (1s, negative 1s) .
Previous12 Next