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Appendix

Power-Up Tests

Power-up tests are automatically performed each time the instrument is turned on.

These tests provide the user with the highest possible confidence that the instrument

is operational. They include a Kernel test and Confidence tests.

Kernel Test

A Kernel test failure is considered

"fatal"

to the operation of the instrument. A

Kernel test failure causes the TRIG'D indicator to flash and displays a binary code

pattern on other front panel indicators. If a Kernel test fails, the user can attempt to

operate the instrument normally by pressing the A/B TRIG button. Operation is

unpredictable; it depends on the nature of the failure.

Confidence

Tests

Confidence tests are performed after the processor kernel has been found

operational. These tests check a portion of the instrument for correct operation.

If a Confidence test fails, the readout will indicate the nature of the failure by a

coded message in this format:

TEST XX FAIL YY

where XX is a two-digit test number and YY is a failure code. Table C-1 shows the

function affected by detected failures.

2465B/2455B/2445B Operators

C-1

Tektronix 2445B User Manual

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