2.10.7.5 Short-time power reductions (see R 60-1, 5.7.2.5 Disturbances)

This test is conducted to verify compliance with R 60-1, 5.7.2.2, R 60-1, 5.7.2.3, and R 60-1, 5.7.2.4 under conditions of short-time power reductions

Applicable standards:

For load cells powered by DC mains: IEC 61000-4-29 [15]; IEC 61000-4-1 [14]

For load cells powered by AC mains; IEC 61000-4-11 [16]; IEC 61000-6-1 [17]; IEC 61000-6-2 [18]

Test method

Expose load cell to specified short-timer power reductions

Test conditions

In accordance with 2.7.3.1 Environmental conditions

Preconditioning of load cell

Stabilise load cell under constant environmental conditions

Test load

The test shall be performed with no load or with one small test load (10 v).

Test level

Test	Reduction to:	Duration/number of cycles
Test a	0 %	0.5
Test b	0 %	1
Test c	40 %	10
Test d	70 %	25
Test e	80 %	250
Short interruption	0 %	250

Test procedure in brief

A test generator capable of reducing the amplitude of one or more half cycles (at zero crossings) of the AC mains voltage shall be used. The test generator shall be adjusted before connecting to the load cell. The load cell shall be exposed to short interruptions of power. The mains voltage reductions shall be repeated ten times at intervals of at least 10 seconds.