Picotest M3500A Service Manual page 36

After self-test procedure, the result, PASS or FAIL, will be shown. If the
result is FAIL, the "ERR" annunciator on the display panel will be lit, and
error codes will be stored. You can check the error codes by the following
procedure.
Procedure: MENU
The descriptions of self-test procedures are listed below including test
number, purpose, test setup, and failure criteria.
601 Front panel does not respond The main CPU U1601 attempts to
establish serial communications with the front panel processor U3.
Communication must function in both directions for this test to pass.
602 RAM read/write failed This test writes and reads a 55h and AAh
checker board pattern to each address of ram U1701. Any incorrect read
back will cause a test failure. This error is only readable from the remote
interface.
603 Front-End MCU does not respond The main CPU U1601 attempts to
establish serial communications with the front-end processor U2001.
Communication must function in both directions for this test to pass.
604 A/D noisy test failed This test configures to the 10V dc range with the
internal 0V. A 20ms ADC measurement is performed and the result is
checked against a limit of 0V
605 N2 calibration parameter failed This error message indicates that
N2 calibration parameter is out of range.
606 N3 calibration parameter failed This error message indicates that
N3 calibration parameter is out of range.
607 Buffer1 offset out of range This procedure is to test the offset of
buffer U507. The result is checked against a limit of 0
608 Buffer2 offset out of range This procedure is to test the offset of
buffer U508. The result is checked against a limit of 0
→ →
SYSTEM
±
20uV
36
ERROR
±
0.1mV
±
0.1mV