What To Know
- Zero the tester in the voltage measurement mode by connecting the leads together and adjusting the zero knob until the display reads “0” volts.
- For resistance measurement, zero the tester by shorting the leads and adjusting the zero knob until the display reads “0” ohms.
- Zeroing eliminates the resistance of the test leads and ensures that the displayed resistance reading represents only the resistance of the circuit under test.
Precise measurements are crucial for electrical troubleshooting and maintenance. A multifunction tester, like the Fluke series, serves as a versatile tool for measuring various electrical parameters. However, to ensure the accuracy of these measurements, it is essential to know how to zero fluke multifunction tester.
Why Zeroing is Important
Zeroing a multifunction tester compensates for any internal resistance or offset in the meter’s circuitry. This ensures that the displayed readings are accurate and reliable, especially at low voltage and resistance measurements.
Step-by-Step Guide to Zeroing
1. Safety First
Before proceeding, ensure the tester is disconnected from any circuit or power source. Wear appropriate safety gear and follow proper electrical safety guidelines.
2. Select the Appropriate Function
Set the multifunction tester to the desired measurement function, such as voltage, resistance, or current.
3. Connect the Leads
Connect the black lead to the COM port and the red lead to the appropriate input terminal (e.g., V for voltage, Ω for resistance).
4. Short the Leads
Touch the tips of the test leads together to create a short circuit. This will form a closed loop with minimal resistance.
5. Adjust the Zero Knob
Most Fluke multifunction testers have a zero knob or button. Turn or press this knob until the display reads “0” or the closest possible value.
6. Remove the Short
Once the zero adjustment is complete, separate the test leads to break the short circuit.
7. Verify the Zero
Measure a known voltage or resistance source to verify the accuracy of the zeroing. If necessary, repeat steps 4-6 until the readings are within the expected range.
Zeroing in Different Measurement Modes
Voltage Measurement
Zero the tester in the voltage measurement mode by connecting the leads together and adjusting the zero knob until the display reads “0” volts.
Resistance Measurement
For resistance measurement, zero the tester by shorting the leads and adjusting the zero knob until the display reads “0” ohms.
Current Measurement
Zeroing is not typically required for current measurement. However, if the tester has a zero adjustment for current, follow the manufacturer’s instructions to zero it out.
Tips for Accurate Zeroing
- Use high-quality test leads with clean and securely connected tips.
- Avoid touching the test leads or the zero knob during the zeroing process.
- Zero the tester before each use, especially if it has been stored for an extended period.
- If the zeroing procedure does not yield satisfactory results, refer to the manufacturer’s manual or contact technical support.
Troubleshooting Zeroing Issues
Display Not Reading “0”
- Check the test leads for proper connection and cleanliness.
- Ensure the zero knob is turned or pressed fully.
- Repeat the zeroing procedure carefully.
Zero Shift over Time
- Temperature changes can affect the zero point. Zero the tester periodically.
- Internal components may need calibration or replacement. Contact a qualified technician.
Display Reading “OL” (Overload)
- The test leads may be shorted to a voltage source. Disconnect the tester and check for proper connections.
- The tester may be damaged. Contact technical support.
Answers to Your Most Common Questions
Q: How often should I zero my Fluke multifunction tester?
A: Zero the tester before each use, especially if it has been stored for an extended period.
Q: Can I zero my Fluke multifunction tester on a live circuit?
A: No, always disconnect the tester from any circuit or power source before zeroing.
Q: What is the purpose of the zero knob on a Fluke multifunction tester?
A: The zero knob compensates for any internal resistance or offset in the meter’s circuitry, ensuring accurate measurements, especially at low voltage and resistance readings.
Q: Why is zeroing important for resistance measurements?
A: Zeroing eliminates the resistance of the test leads and ensures that the displayed resistance reading represents only the resistance of the circuit under test.
Q: Can I use my Fluke multifunction tester to zero another tester?
A: No, it is not recommended to use one tester to zero another. Each tester should be zeroed independently.
