Iso-Tech IDM63N Instruction Manual page 10

(2) AC Volts
Range
3V
30V
300V
600V
* Frequency Response : 40Hz ~ 300Hz for 3V Range.
Input Impedance : 10MΩ //less than 100PF.
The reading will fluctuate approximately 2 ~ 5 counts over 200V.
Resolution
1mV
* ±(1.5%reading + 5digits)
10mV
±(1.5%reading + 5digits)
100mV
40Hz to 500Hz
1V
9
Accuracy Over voltage protection
600V DC or 600V rms