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Creating the Correction Factor

As you have seen in this section, the Vector Header record and its associated Channel Header records

contain all the information you need to create a correction factor for a trace’s Y-axis data. Just complete

the following steps:

1. Determine which channels were used to gather data for the trace. (Look at the Vector Header

record’s the_CHANNEL_record fields.)

2. Determine which window correction factor (if any) was used for each channel. (Look in the

Channel Header record’s SDF_WINDOW structure; the field is windowCorrMode.)

3. Create a combined correction factor for each channel using the following formula:







window correction

EU correction







pwrOfChan ⁄ 48

window correction is equal to 1 if step 2 indicates that no window correction was used, otherwise it

is the value of either narrowBandCorr or wideBandCorr.

EU correction is the value of int2engrUnit.

4. Create a trace correction factor by multiplying the two channel correction factors.

Now you can correct the Y-axis data. Just multiply each Y-axis value by the trace correction factor.

Note Some traces are created with data from just one channel. (To indicate that only one

channel was used, one “the_CHANNEL_record” field contains a value of −1.) For

traces such as these, the combined correction factor for the single channel is also your

trace correction factor.

Standard Data Format (SDF)

B-33

1 2 ... 214 215 216 217 218 219 220 221 222 223 224 ... 253 254

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Agilent Technologies 3588A Guia do Utilizador Página 219