Industrial Batteries & Energy Storage
sales@regalelectro.com.au
f.s. (maximum display value or scale length)
The maximum displayable value or scale length. This is usually the name of the currently selected
range.
rdg. (reading or displayed value)
The value currently being measured and indicated on the measuring instrument.
dgt. (resolution)
The smallest displayable unit on a digital measuring instrument.
Measurement Categories (Overvoltage Categories)
This instrument complies with CAT I Safety requirements. To ensure safe operation of measurement
instruments, IEC 61010 establishes safety standards for various electrical environments, categorised
as CAT I to CAT IV, and called measurement categories. These are defined as follows.
Secondary electrical circuits connected to an AC electrical outlet through a transformer
or similar device.
Primary electrical circuits in equipment connected to an AC electrical outlet by a power
cord (portable tools, household appliances, etc.)
Primary electrical circuits of heavy equipment (fixed installations) connected directly to
the distribution panel, and feeders from the distribution panel to outlets.
The circuit from the service drop to the service entrance, and to the power meter and
primary over-current protection device (distribution panel).
Higher-numbered categories correspond to electrical environments with greater momentary energy.
So a measurement device designed for CAT III environments can endure greater momentary energy
than a device designed for CAT II.
Using a measurement instrument in an environment designated with a higher-numbered category
than that for which the instrument is rated could result in a severe accident, and must be carefully
avoided. Never use a CAT I measuring instrument in CAT II, III or IV environments.
The measurement categories comply with the Overvoltage Categories of the IEC 60664 Standards.
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