HBM Genesis series Technical Note page 3

HBM public
GN610, GN611 Isolation and type testing
CAT IV: This category is for measurements directly connected to the source of
a low-voltage mains installation. Think of measurement of: over current
protection devices, ripple control units etc. This category is expecting to have
a minimum of one level of over current protection between the transformer and
connection point of the measurement circuit. (See Figure 1.1).
Figure 1.1: Category indication according to IEC 61010-2-030:2010
Example: A measurement device is specified as 600 V CAT II, maximum input
voltage 1000 V DC.
Table 1.1: Insulation test voltages according to IEC 61010
Nominal Voltage
IEC 61010-2-030:2010
(V RMS or V DC)
5 sec. AC test (V RMS)
CAT II
≤ 150
840
> 150 ≤ 300
1.390
> 300 ≤ 600
2.210
> 600 ≤ 1 000
3.310
Using the above table one can deduct that this specification informs the user
the device passed the insulation tests; 5 sec at 2.210 V RMS and impulse
4.000 V. The maximum operating input voltage is 1000 V DC. This device is to
be used to measure CAT II circuitry up to 600 V.
Impulse test (V)
CAT III CAT IV CAT II
1.390 2.210 1.550
2.210 3.310 2.500
3.310 4.260 4.000
4.260 6.600 6.000
- 2 - 030:2010
CAT III CAT IV
2.500 4.000
4.000 6.000
6.000 8.000
8.000 12.000
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