Iso-Tech IDM 91E Manuel D'instructions page 9

2-3 Electrical Specifications
Accuracy is ± (% reading + number of digits) at 23°C ± 5°C, less than 75% R.H.
Range
200mV
2V
20V
200V
600V
Input Impedance : 10M
Resolution
100 µV
1mV
10mV
100mV
1V
è
.
Accuracy
±(0.5%reading + 1digit)
9
Over voltage
600V d.c. or 600 V a.c. rms