22-805 Manual ((free)) — Radio Shack 24 Range Digital Multimeter

Do not change the rotary switch settings while probes are connected to a live circuit.

Do not attempt calibration without a known reference source. The manual warns that improper calibration voids any remaining safety protection.

For those who want to build their own modern software, the 22‑805 uses a straightforward protocol:

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. radio shack 24 range digital multimeter 22-805 manual

If you have the original cable and a computer with a serial port, you can use the legacy software to log data. Note that the original software was designed for Windows 3.1, 95, or 98 . Safety First

-digit meter, meaning it can display up to (often referred to as a 4,000-count meter). Voltage: Measures up to 1,000V DC and 750V AC . Current: Handles up to 20A (ideal for high-draw circuits). Resistance: Measures up to 40 M Ωcap omega .

RadioShack supplied two programs to log and display data: Do not change the rotary switch settings while

Proper jack alignment prevents short circuits and blown internal fuses.

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The value is higher than the selected range, or the circuit is open. Turn the dial to a higher range. For those who want to build their own

Rotate the function dial to your desired measurement type. To test the display, hold down any button while turning the dial from "OFF" to any function. Taking Measurements

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.

CAT II rated for up to 600V; the meter is protected by double insulation. Measurement Type Maximum Range DC Voltage AC Voltage DC/AC Current Resistance Operating Instructions