Clarke 4500030 CDM3 Digital Instructions
![Clarke 4500030 CDM3 Digital Multimeter manual cover](/images/sAzSoRWJeLnGbphuwKOoawlP/thumbs/thumb175x175.webp)
To measure AC voltage, turn the rotary switch to the AC voltage (V~) position. Insert the red probe into the VΩmA jack and the black probe into the COM jack. Connect the probes across the circuit or component you are testing and read the value on the display.
Check the battery compartment to ensure the batteries are correctly installed and have sufficient charge. Replace the batteries if necessary. Also, inspect the fuse and replace it if it’s blown.
Set the rotary switch to the diode test position. Connect the red probe to the anode and the black probe to the cathode of the diode. The multimeter will display the forward voltage drop. Reverse the probes to confirm there is no reading, indicating correct diode functionality.
Turn the rotary switch to the resistance (Ω) position. Connect the red probe to the VΩmA jack and the black probe to the COM jack. Place the probes across the component or section of the circuit you wish to measure and read the resistance on the display. Ensure the circuit is de-energized before measuring.
Set the rotary switch to the continuity test position, typically indicated by a sound wave symbol. Connect the probes to both ends of the circuit or wire. If there is continuity, the multimeter will emit a beep sound.
'OL' indicates that the resistance is over the range being measured, suggesting an open circuit or a resistance value higher than the multimeter can measure in the selected range. Ensure the circuit is correctly connected and within the multimeter's measurement capacity.
Ensure the multimeter is properly calibrated, use the correct measurement settings, and check that the probes and connections are secure. Avoid measuring in noisy environments, and regularly inspect and replace worn or damaged probes.
Turn off the multimeter and remove the test leads. Open the battery compartment and carefully remove the fuse. Replace it with a new fuse of the same rating and size, then reassemble the multimeter.
Store the multimeter in a cool, dry place. Remove the batteries if you do not plan to use the device for an extended period to prevent battery leakage. Keep the multimeter and its accessories in a protective case to prevent damage.
Always start with the highest range when measuring voltage or current to prevent damage. Use appropriate personal protective equipment, keep fingers behind probe guards, avoid measuring in wet or damp conditions, and never exceed the specified input limits.