Set the rotary switch to the highest or V--- (DC) range if the voltage is unknown. Touch the test probes to the circuit under test.
Set the dial to V~ (AC) or V--- (DC). For testing a standard AA battery, use the DC setting; you should see a reading around 1.5V. Continuity: Use the Ωcap omega
Turn the rotary power switch to and remove the test probes.
Limit 10A current measurements to a maximum of 15 seconds per test. Replacing the Battery and Fuse Turn the meter off and disconnect both test leads.
: Measures high-amperage lines up to 20A AC/DC . Resistance Range : Tests circuits up to 40 MΩ .
Cons
Beyond the essentials, the 22-805 includes standout features that enhance usability, including a function to freeze readings, an Auto Power Off mode to conserve battery, a Continuity Buzzer for quick cable checks, a dedicated Diode Check function, and a battery-saving Low-Battery Indicator .
the 10A socket is used only for high-current measurements. 3. Operating Instructions Display and Controls
Replace the glass fuse (usually 0.2A/250V for the mA jack; the 10A jack is often unfused or has a high-current fuse). 5. Troubleshooting Common Issues Potential Cause No Display Dead Battery / Improper Switch Position Replace 9V Battery / Check Switch No Current Reading Blown Fuse / Wrong Input Jack Replace Fuse / Use 10A Jack Erratic Readings Weak Battery / Poor Test Lead Contact Replace Battery / Clean Test Leads "1" Displayed Overload (Range too low) Increase Range
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?
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Check if the batteries are dead or installed with reversed polarity.
Connect the red probe to the positive open end and the black probe to the negative open end of the break. Turn on the circuit power to read the current draw. Turn off the circuit power before removing the meter leads. 3. Measuring Resistance