"【TGF4042 Signal Generator】" Narrow pulse signal output measurement

fine0406

"【TGF4042 Signal Generator】" Narrow pulse signal output measurement [Copy link]

The signal generator can emit signals of various waveforms, including common sine, square, pulse, Gaussian, etc., uncommon cardiac waveforms, pulse waveforms, various customized waveforms, etc., as shown in Figure 1 and Figure 2 .

Figure 1 Uncommon waveform

Figure 2 Slow rise and fast fall waveform

These special waveforms have special applications in some specific occasions.

In the field of non-destructive testing, sometimes some fast-rising and fast-falling narrow pulse width waveforms are needed, such as electromagnetic - ultrasonic non-destructive testing technology. The rising and falling edges of the excitation waveform are directly related to the frequency of the ultrasonic signal generated by the material under excitation, and also affect the resolution and resolution of the test results.

To generate a narrow pulse width signal using this signal source, first take the 100kHz output square wave signal and change the signal duty cycle to the minimum, as shown in Figure 3 below.

Figure 3 Signal source settings

The minimum duty cycle can only reach 0.2% . The waveforms acquired by the oscilloscope are shown in Figures 4 and 5 below .

Figure 4 Oscilloscope acquisition waveform

Figure 5 Waveform after signal amplification

It can be seen that the rising edge of the signal is about 8ns at this time , and the waveform has also become a pulse waveform.

Increasing the signal frequency, due to the limitation of the signal source itself, the rising edge is fixed at 8ns , so the signal duty cycle gradually increases. At 25MHz , the duty cycle reaches 50% , as shown in Figures 6 and 7 below .

Figure 6 25MHz signal setting

Figure 7 Oscilloscope acquisition waveform

Using the pulse mode, the results are shown in Figure 8. The rising and falling edges are as narrow as 8ns .

Figure 8 Pulse wave settings

In the pulse wave setting, the width of its rising and falling edges can be freely set.

Narrow pulse width signals often need to be connected to a power amplifier when used. When we use 1MHz ultrasonic detection, we only need a 0.5us rising edge of the excitation signal. If the 8ns signal emitted by the signal source can be amplified to stimulate 62.5MHz ultrasound, the detection resolution will be very high.

Thank you everyone.

This content is originally created by fine0406 , a user of EEWORLD forum. If you want to reprint or use it for commercial purposes, you need to obtain the author's consent and indicate the source

bigbat

This arbitrary waveform generator is very good, but I wonder if it can simulate the impedance of the signal. Simply simulating the ECG waveform is not very meaningful for ECG instruments. The ECG signal generators (calibrators) I have seen are priced beyond the reach of ordinary small companies. For example: Fluke