Error Messages
Giga-tronics 2500B Series Microwave Signal Generators
Page 134
Operation Manual, Part Number 34737, Rev C, June 30, 2011
B.2
NV RAM Messages
The instrument uses non-volatile memory (NVRAM) to store user settings and configurations. In certain instances, user
messages might be displayed that are related to NVRAM. The following paragraphs explain these instances.
B.2.1
NV RAM 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
NV RAM Reset Due to Battery Failure
The 2500B 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
corruption. 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
NV RAM 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 following 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 57 might appear:
Figure 57: Checksum Test Failure Screen
