NF CA5350, Инструкция по эксплуатации

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4.5 Self -diagnosis
CA5350 4-8
4.5 Self -diagnosis
CA5350
is equipped with the function for conducting self-diagnosis.
This self-diagnosis is conducted automatically when power is turned on. You can also
perform it at your discretion.
Select the Menu
UTILITIES
–SELF TEST
, and press the
ENTER
key to start
self-diagnosis.
U T I L I T I E S
S S E L F T E S T
The following display will appear during self-diagnosis. Second line of LCD shows the
items being diagnosed. In the following figure, it shows that ROM test is being under
progress.
S S S S S S C A 5 3 5 0
S R O M S T E S T
Self-diagnosis usually completes within few seconds. If no error is found, a pass message
will appear for short time and the display will return to the top menu. This diagnosis
cannot be stopped once started.
When an error is found, the following messages will appear in the second line of LCD.

ROM ERROR
Error of the main memory (ROM) of microcontroller

RAM ERROR
Error of the main memory (RAM) of microcontroller

NVRAM ERROR
Error of nonvolatile memory where settings are saved in

HARDWARE ERROR
Overall circuit error
Out of the aforementioned error, when ‘
NVRAM ERROR
’ occurs, all setting memory
numbers 1~9 are initialized to the factory default state (same contents as Memory No.
0), and the next self-diagnosis item will be conducted.
When errors other than “
NVRAM ERROR
” occur,
CA5350
will stop functioning at that
point in time. Turn off the power supply of the rear panel, and restart the power supply.
If error occurs again even after restarting the power supply, there is a possibility of
malfunction of
CA5350
. Turn off the power switch, remove the power supply cord from
the body, and contact NF Corporation or one of our representatives.
Self-diagnosis can only check fatal errors in the internal circuit. Small errors cannot be
found. For increasing the reliability of measurements, it is recommended to conduct
periodic check before starting the work. When conducting important measurements, it is
recommended to conduct check both before and after the measurement.