The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. She has a BSEE from the University of Michigan, Ann Arbor. T&MWĬheryl Diller is the product manager for sources in Agilent Technologies’ Measurement Products Generation Unit in Loveland, CO, where she has worked for six years. By using a function generator’s burst mode, you can produce pulses that are shorter than a function generator will otherwise let you create. The next time you need a short pulse and you don’t have a pulse generator handy, use a function generator. Setting the square wave’s frequency to 500 kHz produces a low-going pulse that is 1 µs wide. The instrument’s output remains high until just after the next burst trigger occurs. When you set the triggered burst to one cycle, the cycle ends before the sine wave crosses back below the threshold. Soon after the burst starts, the sine wave will drop below the threshold and the comparator’s output will fall-remaining low for one-half cycle of the sine wave. When the burst starts, the sine wave in Figure 3 will be just above the high-to-low threshold. This process effectively delays the phase of the instrument’s sine wave so it starts at nearly 1808.įor a 50% duty-cycle waveform that starts low and ends high, adjust the function generator’s burst-phase adjustment to just under 1808. To do this, you must set the function generator’s burst phase so the waveform begins and ends at the high level. Because you can’t get inside the function generator and swap the signals on the comparator’s input terminals, you’ll need another method.įor high duty-cycle waveforms (pulses almost as long as their duration or narrow low-going pulses), you can use the burst mode to extend the high level of the pulse waveform. You can use the same concept to produce the complementary waveform, one that’s low for 1 µs and high the rest of the time. If your function generator refers to the burst rate in terms of frequency, then use a frequency of 100 Hz. Now, set your function generator to produce one cycle of the square wave every 10 ms. Use burst delay to produce narrow low pulses. A burst of one cycle can produce a narrow pulsed, repetitive signal.įigure 3. Use the function generator’s amplitude and offset voltage settings:įor a TTL signal where V high = +5 V and V low = 0 V, set the amplitude to 5 V and the offset level to +2.5 V.įigure 2. You also must set the voltage levels for high and low. Assume that the time the signal is high will be the duration of your positive pulse. Set up a square wave with a 50% duty cycle. (Some function generators refer to the repetition rate in frequency rather than in time, so you may need to convert units in your waveform calculations to match those of your instrument.) To produce a 50% duty cycle square wave that’s high for 1 µs, set the function generator’s output frequency to 500 kHz. In its internally triggered burst mode, the function generator generates n cycles of a waveform every t seconds. You can produce this pulse by using a function generator’s triggered burst mode. Assume you need to generate a pulse that’s high for 1 ms, returns low, and repeats every 10 ms-effectively a signal with a 0.1% duty cycle. You can get a function generator to produce pulses beyond the duty-cycle limits of the comparator. As the threshold reaches the sine wave’s peak, there’s no longer enough voltage difference between the peak and the threshold to produce clean, reliable transitions from the comparator’s output. As the comparator’s threshold level rises (DC2 in Figure 1), the output pulse narrows to Output 2.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |