◇
40
above)
Area A in the figure: shows the circuit frequency response for current sampling. Because
it is necessary to filter the ripple of the power supply frequency → AD sampling →
calculate the test result → analyze whether the current exceeds the set limit. Within the
test current range, the pulse width is greater than 100mS.
Area B in the figure: current fast response circuit.It only filters out high-frequency
interference signals → voltage peak comparison → over-current peak signal lock, only
do limit judgment.Larger than the instrument allowed output current, pulse width greater
than 1mS.
Area C in the figure: arc detection circuit. The arc detection circuit only samples the
amplitude of the sudden change in the current, and the signal high-pass filter removes
the low frequency→voltage peak comparison→pulse lock. A sudden change edge in
current near the set value, and the pulse width is about 1uS-1mS.
4.4.9
Failure Judgment
1.
When the current exceeds the maximum output current that the instrument can withstand, or the
instrument finds a safety hazard, the instrument will immediately cut off the voltage of the test
circuit and wait for the instrument software to check the cause of the error and judge the failure.
2.
If the test result exceeds the limit set by the test item, the instrument will judge that the test piece
is unqualified. And immediately stop the current test, cut off the voltage output, and enter the
processing procedure that the test result is unqualified.
3.
When testing in multiple steps, so long as there is a step
FAIL
, the total test result is
FAIL
.
4.4.10
Test Result Processing
If the test process exceeds the limit, it is judged as unqualified, there are many test items, and the
unqualified judgment processing mode is controlled by the system test mode. Otherwise, the
instrument will display the failure judgment and category, waiting for the user to process.
After the test is over, there is no unqualified mark, and the test result is judged as (PASS). The pass
judgment processing mode is controlled by SYSTEM PASS HOLD, and then ready to start the next
step measurement or return to the test wait state.
In a multi-step test, the control signal output of the system is controlled by the
control mode
. Select
FILE mode, then the test results will only be output when the entire file is tested. The end of the test
is controlled by the
failure mode.
See the system option description for details.
From this state until the next project starts high pressure start, customers can use software to
query test data and results.
4.4.11
STOP (Stop Measuring)
Press the STOP button in any state during the entire test, the instrument will automatically end the
test, and there will be no test results to judge the output when the test is finished.
At the end of the test, the customer can use the software to query the test data.
4.4.12
OFFSET (The base is cleared)
Prior to testing, due to changes in the instrument's operating environment and test cable placement,
some bases may appear during the instrument's no-load test. For customers who require accurate
