Esterline Scientific Columbus JEM-1 Electronic Meter

The JEM‑1 is a solid‑state Joule electronic meter from Scientific Columbus (Esterline) used for measuring energy parameters such as wattage, var, and demand. Common failure points in this class of meters include power supply drift or failure, input line overvoltage, firmware corruption, and register communication errors with the EXJ module. Begin diagnostics by verifying 120/240 V AC input integrity and checking the meter’s internal fuse; then inspect the EXJ register for proper operation and clear any stored error codes via the serial interface. If faults persist, examine the I²C/SPI bus for shorts or open circuits and confirm that the firmware version matches the latest service release.[oss-gpt-20b] Post Comment

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