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press the key
to turn on/off the loading. The test waveform is shown in Figure 3.7.
3.3 OCP Test Function
The ELP/DCH series E-load is provided with over-current protection test function
(OCP). Under OCP test mode, when the voltage of source under test reached Von
value, delay for a while for the E-load to latch. Ascend value by step value at regular
interval. At the same time, check the E-load input voltage and judge whether it is
higher than standard voltage value. If higher, it indicates that OCP does not occur.
Repeat current stepping operation till the E-load operates to the cutoff current; If the
input voltage is always greater than the OCP trigger voltage, OCP does not occur. When
the input voltage is lower than the OCP trigger value, OCP occur and test
terminated. After the test, the over-load protection current is judged to be within the
set current range.
Figure 3.8 OCP test interface
Figure 3.9 OCP loading
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