When was my DSP-4x00 factory calibrated?

Connect the DSP-4x00 to your PC using the Serial Cable.
Now launch LinkWare Version 6.2 
Click on Utilities > DSP-4x00/LT CableAnalyzer > Software Version
DSP-4x00/LT CableAnalyzer Software
You will then see:
Software Version Screen
The calibration date is displayed (it should be flashing above).

We are no longer able to offer calibration and repair for the DSP-4000 CableAnalyzer. It has been replaced with the DTX CableAnalyzer