53 Error Codes

At reset, the Fluke 45 software attempts power-up self-tests and initialization of ROM, RAM, Display, EEROM, and measurement hardware. Self-test failures are reported on the display with "error" in the secondary display and an error code (1-9) in the primary display.

Several of these error codes might never be displayed. Certainly, errors 4 and 5, which signify a faulty or dead display, could not be reported in the normal (displayed) manner. Other errors might not appear on the display. Therefore, the following two additional methods exist for accessing error information:

• The computer interfaces can be used to determine self-check status using the *TST? query. Note that the extent of the error-producing damage could also cause the meter to halt before the computer interfaces are operational.

• The keyboard scan lines (A1U6, SWR1-5), which are also used as status indicators, can be checked as a last resort for accessing error information. The software sets SWR1 (A1U6-21) low to indicate that the basic operation of the processor, ROM, and ROM decode circuitry is intact. SWR2 (A1U6-22) is set low if the ROM check passes. SWR3 (A1U6-23) is set low if the external RAM (A1U10) check passes, and SWR4 (A1U6-24) is set low if the internal RAM (A1U6) check passes. Then, if the display self-check passes, SWR5 (A1U6-25) is set low to indicate that the display is operational.

Table 5-1 describes the error codes.

Note

Each error code is displayed for 2 seconds. Any button press during this period aborts the error display

Table 5-1. Error Codes

Error No.

Meaning

8 9

ROM test failed External RAM test failed Internal RAM test failed Display self-test failed Display dead

EEROM meter configuration corrupted

EEROM calibration data corrupted ("UNCAL" annunciator also lights) A/D chip dead Measurement self-test failed

Refer to Troubleshooting information later in this chapter.

Error 1

ROM (A1U8) checksum match failed.

All the bytes in the ROM (including a checksum byte) are summed

Error 2

External RAM (A1U10) check failed.

Error 3

Internal RAM (A1U6) check failed.

Complementary patterns are alternately written and read from each RAM location for both external RAM and the 256 bytes internal to the 6303Y Main Processor (A1U6). If the pattern read from any RAM location is not the same as the pattern written, the test fails.

Error 4

Display self-check failed

The display processor automatically performs a self-check on power-up, and the Main Processor attempts to read the result of this test.

Error 6

EEROM (A1U5) meter configuration corrupted or EEROM not initialized. At power up, A1U6 reads CRC from EEROm (A1U5) location, then reads configuration data from another location in EEROM, calculates an algorithm to compare to the CRC. If an error is determined, the meter configuration is set to factory default and Error 6 is displayed.

Error 7

EEROM (A1U5) calibration data corrupted.

The EEROM is divided into two storage areas: the default meter configuration storage and calibration data storage. Each area uses a Cyclic Redundancy Checksum, against which the data is checked on power-up. In addition, the calibration data includes parity information for each calibration constant, which is also checked.

If the meter configuration check finds an error, the meter configuration is set to factory defaults, and Error 6 is reported.

If the parity check or the calibration data checksum finds an error, the front panel UNCAL annunciator is turned on, and Error 7 is reported.

Note

Errors 6 and 7 should always appear the first time a meter is powered up with a new, uninitialized EEROM. Error 7 continues to appear at subsequent power-ups until the meter is fully calibrated.

Error 8

Analog Measurement Processor (A1U1) dead.

Error 9

Measurement self-check failed.

The Analog Measurement Processor is programmed to do self test measurements. If the Analog Measurement Processor does not respond, it is considered dead.

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Figure 5-1. Test Point Locator

Wiring Connection Fluke 2680a
Figure 5-1. Test Point Locator (cont)
Fluke A1u1

CALIBRATION FAILURE-RELATED COMPONENTS

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