Extended Diagnostics - Tektronix 11A52 Service Manual

Dia nasties
( When the oscilloscope receives the TEST STATUS message in response to the TEST COMPLETE test execution,
it sends a TEST EXIT message to the amplifier, which will cause the amplifier to exit self-test mode and enter
diagnostic mode.
Extended Diagnostics
· The amplifier diagnostics code lets the user individually execute and receive the results of test/ diagnostic
routines via the oscilloscope's human interface. Diagnostic routines are grouped into Areas and Routines. Each
area contains one or more diagnostic routines. The various routines in an area share a common trait: they report
their results in the same format.
Tests may be executed in one of three modes, known as Single, Cycle, and Cycle_Halt. Single mode causes the
specified diagnostic routine to be executed once, and the results of the test to be reported upon completion. Cycle
mode is achieved by setting 'Terse' mode in the mainframe. Cycle tests are repeated indefinitely, and are
terminated by simultaneously pressing the amplifier's CH 1 and CH 2 front-panel buttons.
Upon detecting the termination signal, the amplifier will report the number of times the test was executed, the
number of times the test failed, and specific failure information. Cycle_Halt mode is identical to Cycle mode,
except that the test cycles until the user either terminates
it
by simultaneously pressing the amplifier CH 1 and
CH 2 buttons, or until the selected test fails. The oscilloscope's human interface determines how the diagnostic
system is presented to the user, so from here on all explanations are specific to the oscilloscope/amplifier
interface.
Table 4-1 lists all the available diagnostic routines for the 11A52:
11A52 Extended Service Manual
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