In the field of electronic technology, "low resistance sampling resistor" and "low resistance sampling resistor" are essentially the same concept without substantial technical differences. They all refer to the same component: a low resistance resistor used to convert the current flowing through it into a voltage signal that can be measured or monitored.
The so-called "difference" mainly lies in the differences in word usage habits and contextual emphasis:
Sampling resistors are more universal and mainstream:
This is currently the most commonly used and standardized term in the field of electronic engineering.
It directly reflects the core function of this resistor: sampling current information. By connecting a low resistor with a known resistance in series along the current path, a voltage signal (V=IR) proportional to the current can be 'sampled'.
Emphasize its role as a sensor, "sampling" non directly measurable current signals into measurable voltage signals.
Widely used in power management, battery management, motor control, overcurrent protection and other occasions that require precise monitoring of current.
'Sampling resistor' is an early or specific term used in certain contexts:
This term is relatively less frequently used compared to "sampling resistors", but it still appears sometimes, especially in some older literature, materials, or specific industries (such as some power supply and instrumentation fields).
Literally, 'sampling' focuses more on the action of 'taking out a sample'. It also refers to the resistor inserted in the circuit to obtain current information samples.
Its function and physical characteristics are completely consistent with the "sampling resistor".
Summary and clarification:
The core function is completely the same: whether it is called a "sampling resistor" or a "sampling resistor", they both use Ohm's law (V=IR) to linearly convert the current signal into a voltage signal by introducing a known, precise, and very small resistance value (usually in the milliohm range) in the current path. This voltage signal is sent to subsequent circuits such as amplifiers, ADCs, or comparators for processing.
The key characteristics are the same: they all need to have:
Extremely low resistance: to minimize self voltage drop and power loss.
High precision: Small resistance tolerance ensures measurement accuracy.
Low temperature coefficient: The resistance value changes little with temperature.
Sufficient rated power: capable of withstanding the heat generated by the current flowing through it.
Low inductance design: Especially in high-frequency or switching applications, it reduces the impact of inductance on measurement.
Sampling resistor "is a recommended term: in contemporary technical documents, design discussions, and component selection," sampling resistor "or more specifically," current sensing resistor "is a more general, widely accepted, and understood term.
'Sampling resistor' can be considered synonymous: if you see 'sampling resistor' in the data, it can be completely understood as' sampling resistor ', without worrying about literal differences. This is usually due to different expressions caused by language habits or historical evolution.
Therefore, when selecting and using such resistors, the focus is not on whether the name is "sampling" or "sampling", but on:
Is the resistance value (R) low enough to meet the requirements of voltage drop and power consumption.
Does the tolerance meet the measurement accuracy requirements of the system.
Is the temperature coefficient (TCR) low enough to ensure stability under temperature changes.
Is the rated power sufficient to withstand the maximum operating current.
Whether the packaging and inductance are suitable for the application scenario (especially high-frequency applications).
There is no difference in technical meaning and practical application between "low resistance sampling resistor" and "low resistance sampling resistor". They refer to the same low resistance precision resistor used for current detection. Sampling resistor "is a more standardized and commonly used term in modern times. Engineers should pay attention to the performance parameters of the resistor itself (resistance, accuracy, power, TCR, etc.) when designing and selecting, regardless of whether the name is "sampling" or "sampling".