Digital Multimeter 22-805 Manual _hot_: Radio Shack 24 Range

RadioShack 24-Range LCD Digital Multimeter (Cat. No. 22-805)

is a versatile, high-precision tool featuring a 3 3/4-digit display (up to 3,999 units) and unique PC connectivity for data logging. Internet Archive Key Specifications & Features Measurement Ranges : Up to 1,000V DC and 750V AC. : Up to 20A AC/DC. Resistance : Up to 40 MΩ. Computer Interface

: Includes an RS-232 serial output for connecting to a PC to log and graph measurements. Display Features Analog Bar Graph

: Provides a visual representation of magnitude similar to an analog needle.

: Freezes the current reading on the screen for easy recording. Safety Rating : Rated for CAT II (600V) applications. Internet Archive Essential Operating Tips Auto vs. Manual Ranging : Press the

button to switch from auto-ranging to manual mode. To return to auto-ranging, hold the button for approximately two seconds. Function Selection radio shack 24 range digital multimeter 22-805 manual

button to toggle between different measurement options within a single rotary switch position. Testing Transistors : The meter includes an

function specifically for measuring the gain of small-signal bipolar transistors. Steam Powered Radio Safety & Maintenance High Voltage Warning

: Never attempt to measure DC voltages above 1,000V or AC above 750V RMS to avoid shock or equipment damage. Battery Care

: The unit typically requires a standard 9V battery. Remove it if the meter will be unused for more than a week to prevent chemical leaks. Fuse Replacement

: If the meter fails to measure current, check the internal fuses. Always disconnect the test leads and turn off power before opening the back cover. Internet Archive Manual Resources RadioShack 24-Range LCD Digital Multimeter (Cat

For full operating instructions, you can view digital copies on the Internet Archive or through technical repositories like RS-232 pinout for the computer interface, or do you need help calibrating the unit for a specific project?

Full text of "radio shack meters support 64777" - Internet Archive

Understanding the RadioShack 22-805 24-Range Digital Multimeter The RadioShack 22-805 is a vintage-style, handheld

-digit digital multimeter (DMM) known for its versatility in field, lab, and home applications. Capable of displaying up to 3,999 units, it offers 24 distinct measurement ranges and includes advanced features like a computer interface for data logging. Key Specifications and Features

This model was designed as a "pro" level tool for hobbyists and technicians. Measurement Capabilities: Voltage: Up to Current: Up to for both DC and AC. Resistance: Up to Set dial to 1

Computer Interface: Includes an RS-232 serial port for connecting to a PC, allowing users to log and graph measurements using supplied software. Safety Rating: Rated as CAT II ( ) with double insulation protection.

Display: Features a digital LCD with an analog bar graph to show input magnitude relative to the full-scale value.

Data Hold: A dedicated function to "freeze" the displayed value for later reading. Operating Instructions

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

6. Battery Test (Unique to 22-805)

• Set dial to 1.5V or 9V battery test.
• Connect probes as usual (red to +, black to -).
• The meter applies an internal load. A fresh 1.5V battery should read near 1.5V, not open-circuit voltage (~1.6V). A weak battery might drop to 1.0V.

Quick Specs (from memory & common sources)

• Display: 3.5-digit LCD
• Ranges: 24 (covering DCV, ACV, DCA, ACA, Resistance, Diode Test, and often Battery Test)
• Key Feature: Usually included a built-in tilt stand, rubber boot, and test leads that stored in the back.

4. Continuity Test (Checking Fuses, Wires, Switches)

• Set dial to Continuity Buzzer (speaker symbol).
• Touch probes together. You should hear a clear beep.
• Touch across a fuse. A beep = good fuse. No beep = blown.

Why Can’t I Just Go to RadioShack.com?

The original RadioShack support site was decommissioned years ago. The company that now uses the RadioShack name primarily focuses on online sales of third-party gadgets and parts; they don’t host PDFs for legacy products like the 22-805.

Key Specifications at a Glance

• Display: 3.5-digit LCD, maximum reading of 1999
• Max Voltage (DC): 1000V
• Max Voltage (AC): 750V
• Max Resistance: 2000 kΩ (2 MΩ)
• Max Current: 10A (separate high-amperage jack)
• Diode Test: Yes
• Battery Test: 1.5V and 9V functions
• Power Source: 9V battery (6F22 or equivalent)
• Fuses: 200mA/250V (fast-blow) and 10A/250V (fast-blow)

The "24 range" refers to the combination of positions on the rotary dial—voltages (AC/DC), currents (AC/DC), resistances, and special functions like continuity and battery testing.