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How can I find the Time Constant of older braking resistors for use with the ATV900 series drives?

I have an older braking resistor I want to use with my ATV900 series drive.  How do I find the time constant?

Product Line:
ATV900 series drives.

All models, All serial numbers where a braking resistor is being added.

The ATV900 series drives requires a "time constant" setting when using a braking resistor.  This information is not available for older resistors.

It is recommended to use the braking resistors in the ATV900 catalog which have this value listed.  Resistors from older applications may not be compatible with the braking resistor/transistor system of the 900 series drive.  This information will not be available on some older resistors.
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