| Products > Test Equipment |
| Possible serious bug in RTO1024 or RTO1000 series scope? |
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| JohnG:
Fellow RTO1000 series scope owners, I think I have found a fairly serious bug in the scope, or at least in mine. Conditions: 2ns/div all 4 channels at 50 ohms waveforms on channels 1, 2, 4 External trigger Probe attenuation manually to 20V/V on channel 1 Probe attenuation at 1V/V for all other channels Problem: When I set the probe attenuation manually to 20V/V on channel 1, if the vertical scale knob is set anywhere from 100 mV/div to 1V/div, the channel 1 trace moves to the right by 600 ps! The blue trace (channel 1) shows what I mean. Correct waveform: [ Specified attachment is not available ] Incorrect waveform: [ Specified attachment is not available ] In fact, if I set the gain to anything other than 1V/V, I will see the same thing at one or more settings of the vertical scale. I can replicate this on any channel by setting its attenuation to something other than 1V/V, and it occurs at other horizontal scales as well. This is a really serious problem, as I have been trying to analyze the timing relationship of some waveforms, and it has cost me many days wondering what the hell is going on. There is absolutely no way a change in probe attenuation factor should shift the waveform in time. Anyone else see this, or is it just me? I have the latest firmware and Win 7 on the scope. John |
| jjoonathan:
Hmm, I can't replicate the problem. What are your Deskew settings? Mine look like this before and after going into Probe Settings and changing Channel 1 to 20V/V: C1: (checked) User skew offset 0s Probe skew offset (off) C2: (checked) User skew offset 0s Probe skew offset (off) C3: (checked) User skew offset 0s Probe skew offset (off) C4: (checked) User skew offset 0s Probe skew offset (off) |
| JohnG:
Thanks for checking. All my deskew values were set to zero (I checked). Probe skew offsets were disabled, and user skew showed the problem whether enabled or disabled, but always set to zero. However, if I switched the inputs to 1Mohm, the problem goes away. It only shows when the input is set to 50 ohm. John |
| pdenisowski:
Have you contacted our technical support center? Phone: 1-888-837-8772 (1-888-Test-RSA), email: customer.support@rsa.rohde-schwarz.com. |
| jjoonathan:
Yeah, I had the inputs at 50ohm and Ch4 inverted. I tried to replicate the other settings, at least to the level of active/not. Have you run File>Selfalignment recently? I have to wonder if your last self alignment slipped up somewhere. |
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