Below are general answers on typical components of an ohmmeter from the list of GAO Tek’s ohmmeters. To facilitate our customers to select our products, we have further classified our ohmmeters by their features automatic calibration, benchtop, dual range, four terminal measurement, handheld, high precision micro, milli, data logging, rugged and wireless.
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Power Source: Battery or external power supply, GAO Tek’s ohmmeters are often portable devices, so they commonly use batteries as a power source. Some of our models may also have provisions for an external power supply.
Selector Switch: Range selector this switch allows the user to select the appropriate range for the resistance being measured. Ohmmeters often have multiple ranges to ensure accurate measurements across a wide spectrum of resistances.
Current Source: Battery or power supply, the ohmmeter needs to generate a current through the resistor being measured. The current source is usually provided by the internal battery or external power supply.
Voltage Measurement Circuit: Voltage divider circuit when a current flows through a resistor, a voltage drop occurs across it. Our ohmmeter measures this voltage drop and uses it, along with the known current, to calculate the resistance. The voltage measurement circuit typically involves a precision resistor network or a potentiometer.
Analog or Digital Display: Analog meter or digital display GAO’s ohmmeters can have either an analog meter (with a moving needle) or a digital display (LCD or LED). The display indicates the measured resistance directly.
Current Regulator: Current-limiting circuit to ensure accurate and safe measurements, ohmmeters often include a current-limiting circuit that controls the amount of current flowing through the resistor under test. This prevents excessive current from damaging the resistor or the ohmmeter.
Zero-Adjustment Controls: Zero adjustment knob, this control allows the user to adjust the GAO Tek’s ohmmeter to read zero when the test leads are shorted together. It compensates for any internal offsets or inaccuracies.