The Metex M-4650CR is a 4.5-digit digital multimeter known for its versatility and the inclusion of an RS-232 interface, which was a "hot" feature during its release. It allows users to log data directly to a PC, making it a favorite for long-term circuit monitoring. Core Technical Specifications 4.5-digit LCD with a maximum reading of 19,999. Accuracy: High precision for DC voltage (typically 0.05%).
Often caused by aging zebra strips connecting the PCB to the LCD. Cleaning these with isopropyl alcohol usually fixes the issue.
🔥 Always discharge high-voltage capacitors before testing them with your M-4650CR to protect the sensitive internal circuitry. metex m 4650cr pdf 12 hot
While the original software came on 3.5-inch floppies, the Metex protocol is well-documented. Open-source projects and modern data logging software (like Sigrok) often support the Metex M-46xx series. This allows you to turn this vintage bench tool into a modern, computerized diagnostic station.
Modern PCs lack RS-232 ports. Using a high-quality FTDI-based USB-to-Serial converter is the "hottest" tip for getting data logging back online. The Metex M-4650CR is a 4
Understanding the CAT ratings to prevent damage during high-voltage testing.
Diode test, continuity buzzer, and transistor hFE testing. Connectivity: Built-in RS-232 port for data acquisition. Why the PDF Manual is Essential Accuracy: High precision for DC voltage (typically 0
Guidance on fuse replacement and battery care to avoid "low battery" accuracy drift. Troubleshooting "Hot" Issues