On 9/1/24 16:54, Steve Holland via groups.io wrote:
This question is for a future project. The HP 3478A has an internal bus that is used to read data from an internal memory with battery backup. I'm interested in knowing when calibration data is read off the internal memory on startup. Are all banks read at startup or is calibration data read just when the instrument is switched to a particular mode and range?
Damn, if only we hadn't lost George Hnatiuk not long ago. :-( He could've answered that question right off the top of his head.
One approach to make this determination is to put a chip clip on the NVRAM and watch its accesses with a logic analyzer.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
Dave McGuire