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155-0078-00: Difference between revisions
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I have attached a schematic of a dc test fixture for manufacturing. | I have attached a schematic of a dc test fixture for manufacturing. | ||
It looks like this fixture only tests for | It looks like this fixture only tests for V<sub>hump</sub>. | ||
There may have been another test fixture for the other dc tests. | There may have been another test fixture for the other dc tests. | ||
Those tests may have been done on a system. | Those tests may have been done on a system. | ||
The | The V<sub>hump</sub> test may have been so difficult to perform on an automated system that it needed this extra fixture. | ||
V<sub>hump</sub> is the amount of maximum dc imbalance, probably referred to the input, which occurs when the variable gain function is swept from full invert to full normal. | |||
I think that the two ends of the curve are set to the same dc output level. | I think that the two ends of the curve are set to the same dc output level. | ||
Ideally, there is no change in dc level under these conditions, but various imbalances in the M84 output devices result in a hump for inverted gain and a hump for the normal gain. | Ideally, there is no change in dc level under these conditions, but various imbalances in the M84 output devices result in a hump for inverted gain and a hump for the normal gain. | ||
Only the -00, -04 and -10 suffixed parts were required to pass this stringent | Only the -00, -04 and -10 suffixed parts were required to pass this stringent V<sub>hump</sub> test. | ||
The fixture was in a rubber footed metal chassis about 4” high 5” deep, and 7” wide. | The fixture was in a rubber footed metal chassis about 4” high 5” deep, and 7” wide. | ||
</blockquote> | </blockquote> | ||