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An HP 3478A DMM Rescue, Part 2: Eternacell Batteries are Forever (Apparently)
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An HP 3478A DMM Rescue, Part 2: Eternacell Batteries are Forever (Apparently)
With the RIFA capacitors replaced in my HP 3478A DMM (see “An HP 3478A DMM Rescue, Part 1: RIFA Madness”), I was able to safely power up the DMM in preparation for battery replacement. With the power on, the DMM no longer relied on the battery to preserve the calibration data. It’s not a simple matter to replace the data-retention battery in the 3478A. You have three options. First, you can read the calibration parameters from the SRAM one by on…
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