Hi guys,
I recently purchased a Tektronix TAS 465 100Mhz Analog oscilloscope. It did not come with probes so I ordered a pair of Uni-T UT-P05 probes rated at 200Mhz from eBay. Now the problem that I appear to have is that I cannot perfectly compensate them. The input impedance of my scope is 1Mohm 20pf, and the probes capacitance at 10x is 20pF +/- 2pF with a compensation range of 15pF-30pF. The probes should therefore have no issues to compensate properly, but they don't.
I have attached pictures of RIGOL DS1052E probes and the UT-P05 probes. As you can tell RIGOL compensates perfectly without issues (RIGOL probe is the top signal)
1Khz
1Khz
10Khz
10Khz
23Khz
23Khz
50Khz
100Khz
200Khz
The Rigol probe (the top signal) only starts to look under compensated at 23Khz and beyond. Does anyone have any explanation as to what is going on? Maybe the Uni-T probes are just sh*t?
Some words of advise would be appreciated. Thanks guys.