Sorry that should be '00CT' and '01CT' not '00CF' and '01CF'. Douglas On Wed, Sep 2, 2009 at 1:33 PM, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote: > Doug Private wrote: > >> Hello, the DTP41 is still useful and I am trying to add a transmission >> measurement light to a standard DTP41 but have had only limited success. >> > > Hi, > > I'm not sure that there is any hope in what you are attempting. > Even plugging a genuine DTP41T plate into a non-T instrument, > doesn't turn it into a DTP41T (I just tried this). I would imagine > there is some other difference, like different firmware, or the > presence of factory calibration information for the transmission mode. > > Graeme Gill. > >