My Account
Is the website displaying in the correct language? Please confirm or select a different language.
Your region has been set automatically. Please confirm or select a different region.
How to Use a Multimeter
A high-quality multimeter is an essential tool for any scale technician. There are three main types of multimeters that can be used to measure voltage: analog, manual-ranging and auto-ranging.
Types of Multimeters
Analog multimeters were the first solution for electronic measurements but fell out of favor due to low accuracy. Now, technicians can use manual-ranging digital multimeters that measure voltage based on a range, but the range must be input manually. Many technicians prefer auto-ranging digital multimeters to automatically calculate the range using volts, amps or resistance as the unit of measure.
Measuring Voltage
There are two types of voltage: direct current (DC) and alternating current (AC). AC is used for measuring objects such as standard electrical wall outlets, while DC voltage is used for batteries and similar devices.
You must set your multimeter to AC or DC when selecting voltage, then you can start testing the scale. Begin with an empty scale. As pressure is applied to the load cell, the value shown on the multimeter increases, and measurement decreases as pressure is removed from the load cell.
Testing Batteries with Multimeters
To test a battery, ensure your lead is changed to the position for measuring DC voltage. Place the positive and negative leads on the respective sides of the battery to calculate readings.
For example, an AA battery is rated at 1.5 volts when fully charged. When tested, the multimeter should provide a reading close to the rated voltage. If it’s much lower, the battery is no longer suitable.
Multimeters Measuring Resistance
When taking bridge resistance measurements of a load cell, ensure the multimeter’s connection is not touched as measurements are taken. Similarly, it is essential that power is not applied to the system, as it could interfere with readings and damage the meter.
Technicians may need to test individual wires, connections or continuity. Refer to the operation manual for your multimeter to learn how to verify and test certain aspects.
Learn More About How to Use A Multimeter
Rice Lake Weighing Systems' ScaleTalk video series dives into various topics for new and seasoned scale professionals. Watch the videos to learn more about using a multimeter and more.
