Is the capacitance of the probe that comes standard with the ZDS2022 oscilloscope relatively large?

The rise time test was performed using the 1MHz square wave signal on the DEMO board. Using the Agilent oscilloscope DSO6102A and its probe, the rise time was 28ns. Using the ZDS2022 and its matching probe, the rise time was about 52ns at the X1 attenuation level; and the rise time was 21ns at the X10 attenuation level. Is this because the probe capacitance configured for the ZDS2022 oscilloscope is larger?

First of all, this statement is problematic, because the larger the capacitance, the longer the rise time. When the ZDS2022 oscilloscope is at the X10 attenuation position of the matching probe, the measured value of 21ns is relatively small (smaller than the 28ns measured by Agilent), which means that the capacitance of the probe is relatively small.

The reason why there are two widely different measured values ​​of 52ns and 21ns at different attenuation levels is that the bandwidth of the probe that comes standard with the ZDS2022 oscilloscope is different at different levels: at X1 level, the bandwidth is only about 10MHz; at X10 level, the bandwidth is 250MHz. The bandwidth limitation will attenuate the high-frequency components and cause the rise time to be longer.

In fact, the rise time of the test signal needs to be tested with a high-bandwidth probe. Because the rise time is independent of the frequency, even if it is a 1KHz square wave, if the rise time of the signal is very short, a high-bandwidth probe must be used to correctly measure the rise time. Therefore, the X1 attenuation gear cannot be used to measure the waveform rise time. In addition, please use the 1KHz square wave that comes with the oscilloscope to calibrate the probe before measurement, otherwise it will also affect the correctness of the measurement result.