We have a HP HFTS (harmonic and flicker test system) 6843A that runs the
original flicker tests. Now 61000-3-3 requires a measurement of dmax 24
times, taking the average of 22 readings. We have come up with a way to do
that manually using the HFTS. I would like to present it to the group and
see if anyone sees an oversight or a better way of doing it. I suspect the
program is the same whether you have the 1kva model or the 5kva model 6843A.
a) Create an Excel "template" to record 24 points of data. Create a formula
that sums the 24 values, subtracts the max and min, and divides the result
by 22. This value is the average dmax required by the amendment.
b) Set up the HFTS as follows:
Integration Periods: 1
PST Int Time: 1 minute
Measurement Delay: 0 seconds.
c) Start the HFTS Voltage Fluctuation test with the EUT off.
d) After several seconds, manually turn on the EUT.
e) At the conclusion of the 1 minute test, record the dmax value reported
by the HFTS on the excel worksheet.
f) Turn off the EUT
g) Repeat steps c) to f) 24 times.
h) Compare the dmax value reported on the work sheet to the appropriate
limit in 61000-3-3, Amendment 1, 2001.
This approach requires manual intervention and takes approximately 1/2 hour.
It appears to address the requirement of the amendment without requiring
modification to the unsupported test equipment.
Comments?
Don Umbdenstock
Sensormatic
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