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Self-Test Procedures
Power-On Self-Test
Each time the function generator is powered on, a small set of self-tests
are performed. These tests check that the minimum set of logic and
measurement hardware are functioning properly. The power-on self-test
performs checks 601, 625, and 626.
Complete Self-Test
Hold the shift key while turning on the power to perform a complete
self-test. The tests are performed in the order shown below.
Performing Individual Tests
You can perform individual self-tests through the SYStem menu and
TEST command. The parameters allowed are ALL, 603, 604, 605, 606,
607, and 608. All numbered tests are looped to give a continuous pass/fail
indication when started from the menu (they will repeat the waveform or
sync signal until interrupted).
601 Front panel does not respond The main
CPU U102 attempts to
establish serial communications with the front panel processor
U1101.
During this test,
U1101 turns on all display segments. Communication
must function in both directions for this test to pass. If this error is
detected during power-up self-test, the function generator will beep twice.
This error is only readable from the remote interface.
602 RAM read/write failed This test writes and reads a 55
H
and AA
H
checker board pattern to each address of ram U103. Any incorrect
readback will cause a test failure.
603 Waveform RAM readback failed This test writes and reads a A55
H
and 5AA
H
checker board pattern (12-bit) to each address of waveform
ram
U404 and U405. The test writes and reads the pattern twice,
at alternating addresses. Any incorrect readback will cause a test failure.
604 Modulation RAM readback failed This test writes and reads a 5A
H
and A5
H
checker board pattern (8-bit) to each address of Modulation ram
U205. The test writes and reads the pattern twice, at alternating
addresses. Any incorrect readback will cause a test failure.
Chapter 6 Service
Self-Test Procedures
110