Operation Manual

CS 2099 Eurocheck Eurocheck operation

4.9 RCD measuring current IΔn=30 mA verification

This test is part of RCD trip-out time calibration and couldn’t be performed separately –

it is valid only for IΔn = 30 mA. Refer to chapter 4.8 for more information.

It is essential that the test instrument measuring current is within certain limits. For

example, standard EN 61557 defines low limit as IΔn – 0 %, and high limit as IΔn + 20

%. Metrel test instruments has even narrower specification, high limit is defined as

IΔn + 10 %.

When RCD trip-out time measurement is performed Eurocheck automatically indicates if

test current was too low or too high (LEDs CURRENT LO or CURRENT HI light

respectively). Eurocheck low limit indication is set to 28 mA, and high limit to 35 mA.

4.10 Insulation resistance calibration

Eurocheck offers 2 insulation resistance values for calibration: 2 MΩ and 50 MΩ. It is

always possible (and recommended) to add third value into your calibration procedure –

0 Ω (short-circuited test leads).

It is necessary to calibrate insulation resistance function with all available measuring

voltages. If measuring voltage is set continuously, it is recommended to perform

calibration with the following voltages: 50 V, 100 V, 250 V, 500 V and 1000 V.

Fault loop impedance calibration can be performed with universal test cable or tip

commander. Make sure to follow connection instructions for the tested instrument

(determine the leads of the test cable which are used for this measurement). Generic

connection diagram is shown in Figure 4.3.

Figure 4.3: Performing insulation resistance calibration using universal test cable