15
CM-450
Specifications
Display: 3-3/4-digit LCD (4000 maximum reading)
Sampling Rate: 3 per second
Overrange Indication: “OL” appears on the display
Maximum Conductor Diameter: 26 mm (1.02")
Measurement Category: Category III, 600 V
Temperature Coefficient: 0.15 x (specified accuracy) per °C below 18 °C or above
28 °C
Operating Conditions:
At 0% ≤ 80% RH: 5 °C to 31 °C (41 °F to 86 °F)
Decreasing linearly to 50% RH at 40 °C (104 °F)
Altitude: 2000 m (6500') maximum
Indoor use only
Storage Conditions: -20 °C to 60 °C (-4 °F to 140° F), 0% to 80% relative
humidity with battery removed
Pollution Degree: 2
Battery: 3 V standard button battery (IEC-CR2032; ANSI-NEDA-54004LC)
Measurement Categories
These definitions were derived from the international safety standard for insula-
tion coordination as it applies to measurement, control, and laboratory equipment.
These measurement categories are explained in more detail by the International
Electrotechnical Commission; refer to either of their publications: IEC 61010-1 or
IEC 60664.
Measurement Category I
Signal level. Electronic and telecommunication equipment, or parts thereof. Some
examples include transient-protected electronic circuits inside photocopiers and
modems.
Measurement Category II
Local level. Appliances, portable equipment, and the circuits they are plugged into.
Some examples include light fixtures, televisions, and long branch circuits.
Measurement Category III
Distribution level. Permanently installed machines and the circuits they are hard-
wired to. Some examples include conveyor systems and the main circuit breaker
panels of a building’s electrical system.
Measurement Category IV
Primary supply level. Overhead lines and other cable systems. Some examples
include cables, meters, transformers, and other exterior equipment owned by the
power utility.
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