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FRAX User's Manual
© 2011 Megger Sweden AB
The screenshot above, the custom model designed by Megger for the Active Voltage probe
AVP-101, illustrates some of the features of Custom Models. Type 0 represents the SFRA(dB)
Magnitude graph and since the AVP-101 has a ratio of 10, the equation becomes 20*log10
((ch1*ratio)/ch0). The phase is just the phase, but since all phase variables (Vars...) come in
radians and we want to plot in degrees we multiply the phase by 360/(2*Pi), ph2 = ph1-ph0).
The buttons Units, Vars, Func, and Graph Types provide lists with available units, variables,
mathematical functions, and graph types that can be used within formulas. Please note that a
formula only affects one graph type. That is, a type must be unique for each formula, and
two or more formulas can not share the same type. Click the Save button to save the model.
The model is listed as "User defined" in the Models dialog for later use.
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