Level 2 Diagnostics; Level 3 Diagnostics; Normal Operation Errors - Tektronix RTD 710A Service Manual

to normal operation, or to execute Level 2 or 3 diag-
nostic routines.
When a kernei verification routine detects a failure
in some part of the kernel that prevents an error
code from being displayed in the Controi indicator,
or disables the front-panel controis, or prevents the
GPIB interface from controlling or querying the in-
strument, a set of internal MPU LEDs provide an in-
dication of the defective kernel device.
LEVEL 2 DIAGNOSTICS
Level 2 diagnostics are called Level 2 because they
execute only from the Level 2 "command state" where
the execution sequence and operating mode settings
(such as, loop until fail, loop until pass, etc.) are
controlied by the operator. These diagnostics consist
of Predefined Fault isolation, Exercise, or Calibration
Routines, which are contained in ROM.
ber of Level 2 routines that would require too much
time to be run at power up. Exercise Routines are
vention to set up additional testing hardware, or to
analyze the result of a display. Calibration Routines
are mainly used to generate specific waveform pat-
tems for adjusting the analog circuitry in the instru-
ment. Figure 2-2 shows the routine execution flow
for Level 2 diagnostics.
LEVEL 3 DIAGNOSTICS
Level 3 diagnostics are referred to as User-Defined
(DEPosit, EXEcute, and FETch) to store, call, and
execute these routines.
FP; DIAGNOSTICS KEYS (VSI/T)
NORMAL
OPERATION
= DIAGNOSTIC LEVEL 2
COMMAND STATE FP: RETURN TO NORMAL KEY ecaLt/Log) |
GPIB: TEST MODE OFF
FP: START KEY
GPIB: FETCH, DEPOSIT, & STEP KEY
EXECUTE LEVEL 3 EXECUTE LEVEL
DIAGNOSTIC TEST OR LEVEL 2 DIAGNOSTICS
COMPLETE
AUTO: SINGLE LOOP COMPLETE
e " LOOP CONDITION MET
FP: STOP KEY
GPIB: HALT
Fig. 2-2 State diagram for level 2 diagnostics
2-2
RTD 710A Service Manual