End of Report
The Micronta 22-212 is a classic analog multimeter sold by RadioShack during the late 20th century. Known for its distinct fold-up case design and reliable performance, this test instrument remains a favorite among vintage electronics hobbyists, DIYers, and technicians.
Used for DC Voltage and DC Milliamperes. It reads from left to right. Multiply or divide the scale numbers based on your chosen range (e.g., on the 10V range, use the 0–10 scale directly; on the 1000V range, multiply the 0–10 scale by 100).
0–2.5V, 10V, 50V, 250V, 1000V (20,000 Ohms/Volt) micronta multimeter 22 212 user manual
Break the circuit path and connect the meter in so the current flows through the meter (Red to positive source side, Black to load side).
The battery powers the resistance (Ohms) circuit. It is not required to measure voltage or current.
A knob to calibrate the meter to zero when measuring resistance. 3. Operation Instructions A. Measuring DC Voltage (DCV) Plug the Black probe into - and the Red probe into + . End of Report The Micronta 22-212 is a
Set the rotary switch to the highest DC V range (1000V) if the voltage is unknown. If you know the voltage is low, select the closest range higher than the expected voltage (options typically include 10V, 50V, 250V, 1000V).
Connect the probes across the component (ensure the circuit power is completely off). Multiply the needle reading by the range multiplier used. 4. Measuring DC Current Connect the black lead to and the red lead to V-Ω-A .
The Micronta 22-212 solves this with a built-in mirror strip. When reading the meter, shift your head until the actual metal needle perfectly aligns with and hides its own reflection in the mirror. Once the reflection disappears behind the physical needle, look directly up or down to read the exact graduation mark. Maintenance and Battery Replacement It reads from left to right
For resistance (Ohms) testing, the device requires a fresh internal battery (typically a single AA), while voltage and current measurements are powered by the circuit you are testing. Key Specifications at a Glance Range/Capability Sensitivity 2,000 Ohms/Volt DC Voltage 15V, 150V, 1000V AC Voltage 15V, 150V, 1000V DC Current Up to 150mA Resistance Up to 100k Ohms
20,000 Ohms/Volt DC, 10,000 Ohms/Volt AC
Before any measurement, look at the meter face. Locate the small screw (usually plastic) directly below the center of the needle pivot. Use a small flathead screwdriver to turn it until the needle rests exactly on the mark at the far left of the scale (for voltage/current) — not the infinity symbol .
Always start at the highest range setting and work down to avoid damaging the meter movement. A. Measuring DC Voltage (DCV) Set the rotary dial to the DCV range. Connect the red lead to the positive ( ) side of the source and black to the negative ( −negative Read the voltage on the black scale. B. Measuring AC Voltage (ACV) Set the rotary dial to the ACV range.
Set the rotary selector switch to the highest position (1000) if the voltage is unknown. If you know the voltage is low, select the 150V or 15V range.