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Audix Technology (Shenzhen) Co., Ltd. Report No. ACS-E07439 page 29 of 66
7. IMMUNITY PERFORMANCE CRITERIA DESCRIPTION
Performance Level
The test results shall be classified in terms of the loss of function or degradation of performance of the
equipment under test, relative to a performance level by its manufacturer or the requestor of the test, or the
agreed between the manufacturer and the purchaser of the product.
Definition related to the performance level:
1. Based on the used product standard
2. Based on the declaration of the manufacturer, requestor or purchaser
For EN55024
Criterion A:
Definition: normal performance within limits specified by the manufacturer, requestor and purchaser.
The equipment shall continue to operate as intended without operator intervention. No degradation of
performance or loss of function is allowed below a performance level specified by the manufacturer when
the equipment is used as intended. The performance level may be replaced by a permissible loss of
performance. If the minimum performance level or the permissible performance loss is not specified by the
manufacturer, then either of these may be derived from the product description and documentation, and by
what the user may reasonably expect from the equipment if used as intended.
Criterion B:
Definition: temporary loss of function or degradation of performance which ceases after the disturbance
ceases, and from which the equipment under test recovers its normal performance, without operator
intervention.
After the test, the equipment shall continue to operate as intended without operator intervention. No
degradation of performance or loss of function is allowed, after the application of the phenomena below a
performance level specified by the manufacturer, when the equipment is used as intended. The performance
level may be replaced by a permissible loss of performance. During the test, degradation of performance is
allowed. However, no change of operating state or stored data is allowed to persist after the test. If the
minimum performance level (or the permissible performance loss) is not specified by the manufacturer, then
either of these may be derived from the product description and documentation, and by what the user may
reasonably expect form the equipment if used as intended.
Criterion C:
Definition: temporary loss of function or degradation of performance, the correction of which requires
operator intervention.
Loss of function is allowed, provided the function is self-recoverable, or can be restored by the operation of
the controls by the user in accordance with the manufacturer’s instructions. Functions, and/or information
stored in non-volatile memory, or protected by a battery backup, shall not be lost.
Criterion D:
Definition: loss of function or degradation of performance, which is not recoverable, owing to damage to
hardware or software, or loss of data.
Criterion A:
Definition: normal performance within limits specified by the manufacturer, requestor and purchaser.
The equipment shall continue to operate as intended without operator intervention. No degradation of
performance or loss of function is allowed below a performance level specified by the manufacturer when
the equipment is used as intended. The performance level may be replaced by a permissible loss of
performance. If the minimum performance level or the permissible performance loss is not specified by the
manufacturer, then either of these may be derived from the product description and documentation, and by
what the user may reasonably expect from the equipment if used as intended.
Criterion B:
Definition: temporary loss of function or degradation of performance which ceases after the disturbance
ceases, and from which the equipment under test recovers its normal performance, without operator
intervention.
After the test, the equipment shall continue to operate as intended without operator intervention. No
degradation of performance or loss of function is allowed, after the application of the phenomena below a
performance level specified by the manufacturer, when the equipment is used as intended. The performance
level may be replaced by a permissible loss of performance. During the test, degradation of performance is
allowed. However, no change of operating state or stored data is allowed to persist after the test. If the
minimum performance level (or the permissible performance loss) is not specified by the manufacturer, then
either of these may be derived from the product description and documentation, and by what the user may
reasonably expect form the equipment if used as intended.
Criterion C:
Definition: temporary loss of function or degradation of performance, the correction of which requires
operator intervention.
Loss of function is allowed, provided the function is self-recoverable, or can be restored by the operation of
the controls by the user in accordance with the manufacturer’s instructions. Functions, and/or information
stored in non-volatile memory, or protected by a battery backup, shall not be lost.
Criterion D:
Definition: loss of function or degradation of performance, which is not recoverable, owing to damage to
hardware or software, or loss of data.
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