Several Common Errors in Instrument Measurement

Many of the errors in the use of their equipment measurements, then what are the common errors in the instrument measurement?

1. Impact error, also known as environmental error, refers to the additional error caused by temperature, humidity, pressure, electromagnetic field, mechanical vibration, sound, light, and radioactivity.

2. Personal error The error caused by the limitation of human sense organs and moving organs. For some measurements that require human eyes, human ears to judge the results, and measurements that need to be manually adjusted, human error will be introduced. For example: reading the wrong scale, reading wrong readings.

3. Instruments, instrumentation errors introduced by the instrument, the instrument itself and its accessories, due to the instrument's electrical or mechanical properties of the resulting error. For example: the standard resistance in the bridge, the probe line of the oscilloscope all contain errors. Instruments, instrument zero offset, inaccurate scale, and errors caused by nonlinearity are instrumental errors.

4. The use of error, also known as operational error, refers to the error caused by improper installation, adjustment, layout, and use during the use of the instrument. For example: if the instrument should be placed in a vertical position according to regulations but placed horizontally, the instrument is badly grounded, because the test lead is too long to cause loss or does not consider the impedance match, not according to the operating procedures without preheating, adjustment, calibration, etc., There will be usage errors.

5. The method error refers to the error caused by inappropriate modification of certain classical measurement methods due to the imperfect measurement method used and the theoretical basis is not strict, that is, any error is not reflected in the expression of the measurement result. Factors, but in fact the error caused by these factors when they work, we are also called theoretical errors. For example, when using an ordinary multimeter to measure the voltage across a high-impedance resistor in a circuit, a diversion occurs because the internal resistance of the multimeter's voltage block is not high, causing measurement errors.