Summary

Understanding how to select the appropriate range for measurements is crucial for accuracy. The manual explains the process and provides tips on how to avoid overloading the multimeter.

Finally, the manual is now a historical document. For collectors and restorers of vintage electronics, the original 22-805 manual is as valuable as the multimeter itself. It confirms calibration procedures using obsolete batteries (the 9V and AA), explains the limitations of the 200mA fuse, and describes the device’s 1,000 ohms-per-volt sensitivity on AC ranges—a specification that would be considered laughably poor by today’s standards. Studying the manual today reveals how much measurement technology has advanced, but also what has been lost: the expectation that the user would read, understand, and respect the tool before turning the dial.

Before measuring, familiarize yourself with the physical layout. Looking at the front panel, you have:

This section helps users familiarize themselves with the parts of the multimeter, including the display, function switch, and input jacks. It also lists the accessories that come with the device.

: Use the RS-232 Connectivity documentation from sigrok to interface with modern software. Safety Warnings