To measure current up to 20A, the red lead must be moved to the specific high-current (20A) jack .
The RadioShack 22-805 is a versatile, 24-range digital multimeter (DMM) designed for field, lab, and home use. Known for its durable build and 3¾-digit LCD display, it remains a reliable tool for measuring voltage, current, and resistance with high precision.
-digit display (up to 3,999 units) and unique PC connectivity via an RS-232 interface.
: Includes 24 ranges for DC/AC voltage, current, and resistance. radio shack 24 range digital multimeter 22-805 manual
If the meter can read voltage and resistance but shows an incorrect or "OL" reading when attempting to measure current, the internal fuse for that current range is likely blown. The 20A range uses a dedicated high-current fuse.
is a portable, compact device designed for home, shop, and field applications. It features a
Due to Radio Shack’s bankruptcy and restructuring, you cannot request a manual from the company directly. However, the manual is preserved in several online archives. To measure current up to 20A, the red
Furthermore, the manual embodied Radio Shack’s unique business philosophy: empowering the amateur. The company knew that selling a $30 multimeter was only the beginning; customer loyalty came from the user’s ability to succeed with it. The 22-805 manual therefore included reference data rarely found in modern compact leaflets, such as a table of standard resistor color codes, a guide to interpreting diode polarity, and even a troubleshooting flowchart for common household appliance failures. It assumed the reader was intelligent but inexperienced, a refreshing contrast to today’s minimalist “quick start” guides that direct users to a website.
Plug the red (positive) lead here for voltage, resistance, and diode checks.
He opened the battery compartment on the back of the 22-805. The manual’s diagram was perfect—it showed the exact location of the fuse carrier. He pulled the blown glass tube. It was a standard 200mA fuse. -digit display (up to 3,999 units) and unique
The numbers climbed. 50mA... 100mA... 150mA...
He didn't have a replacement. But the manual had taught him something else: the 10A range was unfused, designed for heavy lifting, though only for short durations.
In the world of electronics, a digital multimeter is an indispensable tool for both professionals and hobbyists. Among the plethora of options available, the RadioShack 24 Range Digital Multimeter (model 22-805) stands out for its versatility and reliability. This blog post aims to provide an in-depth look at the manual of this multimeter, helping users understand its features, functions, and how to make the most out of this device.