I'm interested in an insulation resistance tester U1451A. But it is not clear for me, what are the measurement ranges. I assumed that the ranges are
but this is not possible, because the meter is advertised with "up to 66GΩ", and not 60GΩ.
In the manual is written (table 5-7):
This is very unclear for me. What means "<500MΩ". Why not 500MΩ or 600MΩ?
Is there no range between 500MΩ and 200GΩ?
Why 200GΩ? The meter is only specified up to 66GΩ.
Can somebody help me?
I need the values for 500V testing voltage.