648系列备用电池的用途是什么？

您好，我的8648D中的2 / 3A锂备用电池已经死了。
我没有一个方便，所以我连接了CR系列纽扣电池。
当我第一次恢复CAL数据时给单元上电，有时在上电时它会显示503消息，用于恢复衰减器校准数据（我假设是从EEPROM，它看起来像是cal，但消息很烦人。
我猜测我使用的电池可能没有足够的电压来保持内存备份，它只是根据需要恢复数据。我打算订购并安装正确的电池但我想知道为什么惠普不仅仅得到
来自EEPROM的校准数据。有没有人确切地知道这个电池实际备份了什么以及为什么该单元从SRAM中运行校准数据。这是因为速度吗？任何使用这些发电机的是德科技/惠普员工可以启发我
产品的设计/功能？任何CLIPS或详细的数据？由于这些已经失去支持多年，它们出现在剩余市场上，是业余无线电（火腿）工作台的精彩发电机。
如果是德科技会发布会很棒
8648系列的完整原理图和细节。
73. Sam W3OHM



     以下为原文

  Hello,

The 2/3A Lithium Back up battery in my 8648D is dead. I did not have one handy so I wired in a CR series coin cell. When I powered up the unit the first time it restored the CAL data, On occasion on power up it shows the 503 message for restoring the attenuator cal data (I am assuming from EEPROM, It appears to be in cal but the message is annoying.

I am guessing that the battery I used may not be enough voltage to keep the memory backed up and it is just restoring the data as needed. I plan to order and install the correct one but I would like to know why HP did not just get the cal data from the EEPROM.

Does anyone know exactly what this battery actually backs up and why the unit runs the cal data out of SRAM. Is it because of speed?

Any Keysight/HP employees that worked on these generators that can enlighten me as to the design/function of the product?
Any CLIPS or detailed data out there? Since these have been out of support for some years they are showing up on the surplus market and are wonderful generators for the amateur radio (ham) workbench. It would be wonderful if Keysight would release the full schematics and details of the 8648 series.

73.

Sam
W3OHM