Touch the red probe to the anode (positive end) and the black probe to the cathode (striped/negative end). A healthy silicon diode displays a forward voltage drop between 0.5V and 0.7V. Reverse the probes; the meter should read "1" (infinite resistance). 🧼 Maintenance, Battery, and Fuse Replacement
Never attempt to measure voltages higher than 1000V DC or 750V AC to prevent shock or meter damage.
: Rated at CAT II (600V) , which is suitable for standard household outlets and long branch circuits. Operation and Maintenance Power : Typically requires a standard 9V battery .
Turn the rotary switch to the Diode symbol position. radio shack 24 range digital multimeter 22-805 manual
Who it’s for
Plug the red test lead here for all other measurements (voltage, resistance, low current). COM Jack (Black): Plug the black test lead here. Powering On The 22-805 uses a 9V battery. To install or replace: Remove the test leads from the inputs.
While the original printed manual is now scarce, it has been preserved online by vintage electronics communities. You can download the full 36-page manual for free in HTML or PDF format from the following sites: Touch the red probe to the anode (positive
: Features auto-polarity operation and is protected by double insulation to reduce electric shock risks.
Ensure your test leads match the desired function. Plunge the black lead into COM and the red lead into V/Ω/mA (or 10A for high current).
Never measure resistance on a live circuit; the meter could be damaged and you could be shocked. Turn the rotary switch to the Diode symbol position
The large central rotary dial used to select the desired measurement type (Volts, Ohms, Amps) and the specific range.
The meter includes an RS-232 serial port for connecting to a PC, allowing users to log and graph measurements live. Analog Bargraph:
Used to select the measurement type (Voltage, Current, Resistance).
Before using the 22-805, ensure you have read the manual and are familiar with high-voltage testing procedures. How to use a multimeter like a pro! The Ultimate guide