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Q: What does the display "OL" mean on the VOLTCRAFT OM-100 multimeter?

On the VOLTCRAFT OM-100 multimeter, the display "OL" means Overload , indicating an overload or exceeding the measurement range. Specifically, this indicates that: The measured value exceeds the maximum range that the device can display in the selected measurement mode. The received signal is too high for the multimeter to measure it correctly. It may also be due to a poor connection of the probes or a problem with the sensor. In this case, it is advisable to: Check that you have selected the appropriate measurement range on the device. Reduce the measured quantity if possible. Check the connections of the probes to ensure they are properly connected. This message is a protection indicator to prevent damage to the device and ensure measurement accuracy.

Q: How to calibrate the VOLTCRAFT OM-100 oxygen detector?

Calibrating the VOLTCRAFT OM-100 oxygen detector is essential to ensure accurate measurements. Here is the procedure to follow: Preparation Expose the sensor to normal ambient air (about 21.0% oxygen) for about 2 hours before calibration. Make sure the device is turned off before starting. Calibration Steps Press and hold the MODE button, then briefly press the power button. Continue to hold MODE until the display shows "APO" , then press the APO button. Release all buttons when the screen displays "CAL" . Use the MODE or APO buttons to adjust the displayed value to about 21.0% oxygen. Press the power button briefly to save the calibration and turn off the device. Practical Tips Calibrate regularly to maintain measurement accuracy. If results remain inaccurate after several calibrations, the sensor may need to be replaced.

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