Scale problem

[Paopao]

Hi guys,
it's me again: I have recently got back to technical drawign after years so pardon me if I ask silly questions.

This time it's about "scale" and printing in scale. I have noticed that all my drawings (I use an imported dxf from a local office for urban planning) are set to 1:48. I have set the measures to metric and set all the rest to the right measure system (initially I thought the program was set to fett/inch and maybe it was when I loaded the dxf, I can't remember). The scale is correct when I measure with the meter: all the measures correspond to the metric values. Anyone can shed some light on this mistery? What am I doing wrong and how can I fix it?

Thanks for your help.
PP