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I recently acquired a second-hand TDS3034B which shows quite large errors during warmup. The screenshot shows the offset recovery during warmup at 10 secs per division. Channel 2 is almost a volt out at switch on, although this is at the worst case vertical setting of 1V per division, higher sensitivities have much less offset.
After a warmup of 5 mins or so, the offset is negligable and Signal Path Compensation passes. Amplitude measurements are good over a wide frequency range.
Can someone put my mind at rest and tell me this is normal !?
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