SIMPSON MultiCorder 604 (Multimeter/Chart Recorder)

Circa Late 1960's to Late 1970's

An analog multimeter and strip-chart recorder used for data logging in professional and industrial settings.

Use Cases:

The 604 is used to create a permanent, physical record of electrical fluctuations over time. Unlike a standard meter that shows only a current value, this device uses a pen-and-ink or pressure-sensitive system to "draw" the readings onto moving paper.

• Industrial Power Monitoring: Used in factory substations to monitor line voltage stability over a 24-hour cycle to identify "brownouts" or surges that could damage machinery.

• HVAC/R Troubleshooting: Employed by technicians in commercial building utility rooms to track the cycling of large compressors and motors, helping to diagnose intermittent thermal overloads.

• Scientific Research & Labs: Used in test laboratories for monitoring battery discharge curves or the long-term stability of sensors and transducers.

• Field Service & Telecommunications: Its rugged, portable design made it ideal for use in remote relay stations or central offices to log signal levels and power supply consistency.

Historical Significance:

The MultiCorder 604 is historically significant as the bridge between manual observation and digital logging. It brought the accuracy of the legendary SIMPSON 260 VOM into the realm of automated recording. At the time of its release, it was considered a "high-density" instrument because it combined a multi-range AC/DC meter with a complex mechanical paper drive—a feat of precision engineering before the advent of solid-state memory.

(H-10.5cm x W-11.5cm x D-24.5cm)