https://www.tek.com/en/support/faqs/how-replace-cmos-battery-dpo-dsa-7000-70000-series-oscilloscopes
how replace cmos battery dpo dsa 7000 70000 series oscilloscopes | Tektronix
What if my DPO/DSA 7000/70000 Oscilloscope is losing its time or date settings, or I am getting CMOS Read Error, CMOS checksum error, or CMOS Battery Failure...
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