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Under Range & Overload Conditions
Under Range Condition
An under range condition occurs when the vibration level is equal to, or lower
than the bottom of the current range the meter is set to. If this condition
occurs then the UR (Under Range) indicator will be displayed on your
instrument. In such circumstances it is highly recommended to change to a
lower range with a higher sensitivity as your meter will be out of specification.
The under range indicator will remain on for a minimum of 2 seconds or while
the under range condition remains.
Placement of the under range indicator can be found under
Under Range
Indicator
in
Chapter 6
.
See
Technical Specification
for a complete list of Under Range triggering
points.
Overload Condition
An overload condition occurs when either the peak signal starts to exceed the
signal handling capability of the specialised amplifier circuitry or if the vibration
level exceeds the top of the selected range by 5%. If the vibration source
saturates the input circuitry or is 5% greater than top of the selected range an
Overload condition occurs and an OL (Overload) indicator is displayed on your
instrument.
If an overload condition occurs it is highly recommended to change to a higher
range with a lower sensitivity as your meter will be out of specification.
The overload indicator will remain on for a minimum of 2 seconds or while the
overload condition remains.
Please be aware that the selected frequency weighting may attenuate the
displayed signal level below the overload triggering point but an overload can still
occur. This is because the overload operates from the unweighted input signal.
Placement of the overload indicator can be found under
Overload Indictor
in
Chapter 6
.
See
Technical Specification
for a complete list of Overload triggering points.
