BNC 1201 - 6 1/2 Digit Digital Multimeter - Manual (Page 108)

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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  20uV
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

0.1mV
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

0.1mV
609 DC gain x1 failed This procedure is to test the tolerance of DC
gain  1 amplifier. The limit of gain tolerance is  0.005.
610 DC gain x10 failed This procedure is to test the tolerance of DC
gain  10 amplifier. The limit of gain tolerance is  0.05.
611 DC gain x100 failed This procedure is to test the tolerance of DC
gain  100 amplifier. The limit of gain tolerance is  0.5.
612 Ohms 500 nA source failed This test configures to the 10V dc
range with the internal 10M 100:1 divider R204 connected across the