NVRAM Messages
2500A Series Operation Manual, 34172 Revision C, March 2008
B.2.1 NVRAM Reset Due to a Firmware Upgrade
If the instrument’s firmware is upgraded, the start-up process detects the difference in firmware versions
the next time it runs. In this case, the system resets the NVRAM, and displays the following message
once the start-up process is complete:
Memory reset due to firmware upgrade. Please refer to release notes.
B.2.2 NVRAM Reset Due to a Battery Failure
The 2500A circuitry contains a battery to maintain the contents of NVRAM when the instrument is not
connected from the mains power source. On occasion, this battery might fail, which causes NVRAM cor-
ruption. In this case, the system resets the NVRAM, and displays the following message once the start-up
process is complete:
Memory reset due to battery failure. Please contact the service center.
B.2.3 NVRAM Reset Due to a Checksum Failure
A checksum of the NVRAM is calculated as a means of ensuring the integrity of the contents of the
memory. On occasion, a comparison of the current contents of NVRAM with the checksum might
uncover a disparity in values, causing a checksum failure. Checksum failures might be caused by the fol-
lowing situations:
• A firmware defect is present (most likely)
• AC power loss occurred while the system was writing to NVRAM
• A partial battery failure has occurred
If these situations occur, the screen shown in Figure B-1 might appear:
Figure B-1: Checksum Test Failure Screen
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