Question

You used a 5V power supply from your lab kit and built the circuit below such that you met the following criteria:

Nominal Resistor Values:
R0 = 330 Ω, R1 = 2 KΩ, R2 = 330 Ω, R3 = 220 Ω, R4 = 1 KΩ.

RO A R1 R2 5V B С R3 R4 D

What was the reason for high percent error? How do you fix the problem

Answer 1

The main types of measurement error

Systematic errors: Systematic error arises from a faulty measuring device, imperfect observation methods, or an uncontrolled environment. Such error is predictable and is usually constant or yields results proportional to the measurement’s true value.

Random errors: Random errors occur as a result of sudden, random changes in an experiment’s conditions. Such errors are always present in an experiment and largely unavoidable.

How to minimize measurement error

Once you understand the main forms of experimental error, you can act on preventing them. The following precautions will help you reduce measurement error and yield the most accurate results.

Use quality equipment

Using quality equipment is paramount to reducing systematic measurement error. Make sure you’re using an updated and precise measuring device that doesn’t have any defects while conducting your experiment.

Calibrate your equipment properly

Before conducting an experiment, make sure to properly calibrate your measurement instruments to avoid inaccurate results.

Properly train lab staff

The imperfect nature of humans means there will always be human error when they observe and measure results. Minimize this impact by taking the time to train all applicable lab staff on how to properly use all equipment and carry out procedures when conducting an experiment.

Controlled environment

All measurements in an experiment should occur under controlled conditions to prevent systematic error. Changes in external conditions such as humidity, pressure, and temperature can all skew data, and you should avoid them.

Double-check

To reduce the impact of human error, personnel need to double-check all observations, recordings, and measurements. You can easily complete this process by double-entering all findings on two separate worksheets or files and then comparing them.

As previously stated, one of the best ways to reduce measurement error is by using quality equipment. If your current lab equipment is old or worn, it might be time for an upgrade. At USA Lab Equipment, we stock over 1,000 quality lab equipment items—from ultra-low upright freezers to filtration devices—to give you the results you need. For more information regarding our products and services, contact us today.