Short the leads together and perform the described above. Connect the probes across the component.
If you cannot adjust the needle to "0" on the Ohm scale when shorting the leads, the internal battery is weak. Replacing the Battery Close the clamshell case and turn the unit over.
fuse. If the meter stops reading current, the fuse is likely blown.
Caution: Current must be measured in series with the load. Never connect the meter leads directly across a voltage source while set to a current mode, as this will instantly blow the internal components or damage the circuit. Insert the black lead into and the red lead into + .
Connect the probes across the component (ensure the circuit power is completely off).
The top arc displays resistance (Ohms), reading from right (zero) to left (infinity). Below the Ohm scale are the linear scales for AC and DC voltage and current, which read from left (zero) to right. Range Selector Switch
Replace the single AA battery, paying close attention to the polarity markings (+/-).
AC/DC Voltage, DC Current, Resistance, Audible Continuity. This document is based on general documentation for the Micronta 22-212 and similar models from the same era.
Read the top Ohms scale and multiply the value by your multiplier setting:
Break open the circuit path at the test point and insert the meter in series, ensuring the red probe connects to the operational positive side and the black probe goes to the side leading to ground. Apply power to the circuit.
This setting measures current flow through a live circuit up to 150 mA. Set the rotary switch to the position. Turn off all power to the circuit you are testing.
Always start measurements at the highest available range to prevent damaging the delicate internal circuitry. Never attempt to measure voltage when the meter is set to resistance or current modes, as this can burn out the movement.
The user manual outlines critical steps for safely operating the device and ensuring accurate readings.
A: You can find compatible sets on websites like eBay by searching for "vintage multimeter test leads" or "banana plug test leads." Radio Shack stated that replacements were available at their local stores.
Understanding the layout of the Micronta 22-212 is essential for accurate readings.