Radio Shack 24 Range Digital Multimeter 22-805 Manual ((install)) 💫
To use the 22-805, follow these standard procedures for digital multimeters: Preparation Insert the black probe (common) jack. Insert the jack for voltage and resistance, or the jack for current. Voltage Measurement Rotate the dial to the setting (solid/dashed line for DC, wavy line for AC). If the meter is not auto-ranging, start with the highest range and dial down for better precision. Resistance and Continuity Set the dial to the (ohm) symbol. Ensure the circuit is and capacitors are discharged before testing.
: 3 ¾-digit LCD capable of displaying up to 3,999 units (4000 counts) before flagging an over-range limit. DC Voltage (DCV) : Measures up to 1,000 Volts .
Insert the red lead into (for measurements under 200mA) OR the 10A jack (for high current up to 10A). Set the dial to the matching DCA or 10A range. Apply power to the circuit and read the current draw. 4. Continuity and Diode Testing radio shack 24 range digital multimeter 22-805 manual
The Radio Shack 22-805 uses a Metex 14 protocol , a common command interface that modern software supports. It communicates at a very slow 600 baud with a data format of 7 data bits, no parity, and 2 stop bits (7N2). To connect the meter’s DB-9 serial port to your modern PC, you will need a USB-to-Serial (RS-232) adapter.
First and foremost, the manual served a critical safety function. Unlike modern auto-ranging meters that hide complexity from the user, the 22-805 was a manual-range multimeter. Selecting the wrong setting—for instance, measuring 120V AC on the 200V DC range—could damage the unit or cause injury. Consequently, the manual’s first sections were devoted to explicit warnings and procedural checklists. It taught a generation of hobbyists the cardinal rule of diagnostics: always start with the highest range and work down. This document transformed a potentially dangerous piece of equipment into a safe learning tool for teenagers and garage tinkerers. To use the 22-805, follow these standard procedures
is a highly versatile, vintage diagnostic tool designed for field, lab, bench, and home electronics applications. Produced during the late 1990s and early 2000s, this 4,000-count handheld meter stands out due to its advanced auto-ranging capabilities and built-in RS-232 computer interface for data logging.
Set the dial to the (looks like an arrow with a vertical line or sound waves). If the meter is not auto-ranging, start with
The is a reliable instrument when used within its limitations. By following this manual, you can maintain its accuracy and utility for years to come.
Ensure the circuit under test is completely powered off and any parallel capacitors are discharged.
This is one of the most dangerous operations. Turn off power to the circuit before connecting the meter.
