Omegôhmetrounder UHV power can help many power workers conduct various power tests more conveniently.
In order to insulate and prevent current flow between conductors, the resistance can be intentionally very high. Learn how to use a megohmmeter to measure insulation.
Resistors typically exist in one of two categories. The first type is the "small" resistance range used in devices that regulate the amount of current allowed to pass through control and load devices.
The second type is resistance, which is intentionally very high to insulate and prevent current flow between conductors. It may be difficult to measure insulation using a traditional multimeter, but instead, a megohmmeter or "megohmmeter" is used to determine appropriate insulation characteristics.
It is difficult to argue endlessly about the definitions of "high" and "low" values, as different fields may use completely different proportions of components in electrical aspects. However, we can consider two general resistance ranges to describe the differences in testing methods.
A typical multimeter can be used for "low" resistance to obtain readings, typically between ohms and megaohms. These are directly related to the amount of current allowed to pass through the circuit.
For "large" resistance values, the multimeter will display "OL" or a variant of this symbol, indicating a resistance value greater than any value that can be displayed on the instrument. Depending on the specific situation, this may indicate that the switch is open or disconnected. However, in other cases, this can be a measurable insulation resistance value. When the insulation object is indeed the tested component, using a typical multimeter with a relatively low range may not be good enough.
There are a series of testing instruments designed to measure resistance in the billions or gigaohms, far beyond the range of ordinary instruments used for testing insulation. These devices are called insulated multimeters or megohmmeters, or commonly referred to as "megohmmeters".
