I have two 475 scopes. Both have developed a similar probe calibration problem on one channel. I am using the scope calibration signal. I have verified results with multiple probes
First scope - Channel 1 probe calibration tests fine with x1 and x10 probles. Channel 2 calibration tests fine with a x1 probe but the waveform has a sloped rise and fall time when testing with a x10 probe on a vertical sensitivity setting of .5v/div and above.
Second scope - Channel 1 probe calibration tests fine with x1 probes but the waveform is a spike when testing with a x10 probe with vertical sensitivity setting of .5v/div and above. Channel 2 probe calibration works fine with x1 and x10 probes.
Has anyone seen this problem?
please clean the attenuator contacts ans the pins of the attenuator blocks as well.