Tektronix VX4802, User Manual

Page: 90 / 102

Appendix E: Performance Verification
A–26
VX4802
Self Test
The VX4802 includes a built-in self test function (BITE) which is automatically
executed each time the power is turned on and when the Internal Self Test (S)
command is issued. BITE uses internal routines and circuitry to confirm basic
I/O functionality. No external test equipment is required.
During the self test, all outputs are set to a high impedance mode (tri-state) and
then internal loop-back circuitry and test patterns are used to verify all I/O
channels.
In addition to BITE, the front panel indicator lights display the current status of
power, the assertion of SYSFAIL*, backplane cycles, data handshake signals,
and individual I/O data for each byte. The Query command may also be used at
any time during operation to determine the current state of the module.
Following the VXIbus system startup sequence, the green PWR light on the
VX4802 front panel indicates that the self test has passed and that the +5 V
power supply is operational. If the +5 V power supply fails, or its fuse opens, the
PWR light will be off, the FAILED light will be on, and SYSFAIL* will be
asserted indicating a module failure.
NOTE
. If you experience an error indication from the Slot 0 Resource Manager,
the VX4802-under-test, or any other VXIbus module, investigate and correct the
problem before proceeding. Common items to check are logical address conflicts
(primary and secondary; see Table 3), breaks in the VXIbus daisy chain signals,
improper seating of a module, loose GPIB cable, improperly set Slot 0 single-
step switch, or loose or blown fuses.
Performance Verification Tests
The order of execution of this procedure has been chosen to minimize system
setup and functional dependency. Because some tests rely on the success of their
predecessors, it is recommended that you perform all sequences in order.
This sequence verifies that the VX4802 configures correctly and communicates
properly with your GPIB system controller.
Equipment
Requirements No additional test equipment is required.
Prerequisites All prerequisites listed on Page A–22
VXIbus Interface
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