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To minimise the effect of variation between individual converters, users can measure the propagation delays of a specific Option 133 converter device using the test sequence described here. The yellow dots in picture below shows the location of 1pps propagation delays in the Rev C and Rev D Option 133 Converter.
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An example connection is shown below for measuring the Option 133 Converter port 3 to port 4 propagation delay. All cables must be kept as short as possible and the length of the cables must be measured precisely. To avoid temperature effects, ensure that the Option 133 Converter propagation delays are measured at the same temperature as it will be used during final measurement tests.
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Once connected, run a 1pps Time Error measurement with the Delay Compensation set to compensate for the total cable length. Please measure the cable lengths accurately and then compensate at a rate of 5.1ns per metre, plus an additional 0.5ns if the Calnex RJ45 to BNC adaptor cable is used. The measured Time Error (reported in CAT) is the propagation delay between two ports of the Option 100 Converter.
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