output12 to achieve a clean waveform with minimal mains “hum”
7.Now, slowly adjust the trimmer in the probe body until you achieve the best square wave shape that you can. By this we mean nice square corners and minimum over and under shoot near the edges. A small amount of over shoot is preferable to an adjustment with “curved” square wave corners: this would mean that the scope will attenuate high frequency signal components whereas a small amount of overshoot will mean that the scope will tend to slightly amplify high frequency
signal components. A typical trace, after compensation will
look | like | this. |
Some deviation from this is normal due to variations in probe performance. It is possible that on lower cost, lower bandwidth probes that you may see a larger amount of overshoot near the edges. This overshoot may be very narrow and seem to come and go…this is normal. Better quality scope probes have better transient response and so have smaller overshoot.
12Be careful not to
Elan Digital Systems Ltd. | 17 | USBscope50 USER’S GUIDE Iss5 |