FLOWX Engineer 86-21-54150349
Limit switch manufacturers of electronic components like electric actuators have to check that resistors, inductors, switches, relays and connectors suitable to certain specified tolerances and this permanently means that we must take low resistance measurements.
The power cable installations, the maintenance of switchgear, electric motor performance and vehicle or aircraft assemblies meet the same demand. In all situations, the precision measurement of resistance worth is a significant demand for performance, quality control or safety considerations, and the entire limit switch manufacturer should also take them into consideration.
We should grasp the capacity to make accurate and reliable measurements, which is so vital in many industrial and engineering sectors. However, with the values included often being very low - often down to milliohms - then the key demand is to know more information and get rid of potential sources of error from the measurement process, which is so vital for the limit switch manufacturer.
Four final measurements: four wire or final measurement skills have become the standard tool of measuring low resistance and it is especially advisable when measuring resistance below 100 ohm, and the Limit switch manufacturers should be careful when dealing with it.
By using the so called limit switch manufacturer like Kelvin or Thomson configuration, the connecting lead resistance is not revolved in the measurement, and the requirement for lead balancing and nulling is eliminated. What’s more, the measuring current is penetrated through the unknown resistance Rx using the C1 and C2 leads through this technique,
It is not very critical to place these leads which should be put outside the P1 and P2 leads. What’s more, the voltage drop across the Rx is judged across P1 and P2 and these shall be put at exactly the points to be measured. Moreover, the measuring current is quickly penetrated through an internal reference standard in the ohmmeter and the voltage drop across Rx is compared with the volt drop through this internal standard.
The resistance worth of Rx is calculated and displayed from the ratio of these two volt drops. Moreover, for the same current is passed through both the standard and the Rx and the ratio is calculated, the current does not require to be a concise value, all that is needed is that the current is steady for the period when each measurement is created, traditionally 0.5 seconds.
When making low resistance measurement, we always cause some errors, and the most common cause is that poor or improper relation of the RX.connections should be clean, mechanically firm and free from oxides which can make an insulating influence.