Operation Manual

MI 3310 / MI 3310A SigmaGT Measurements

Example of insulation-S probe resistance measurement results

Displayed results:

Main result ............. Insulation resistance (LN – S)

Notes:

 If a Class I device is connected to the mains test socket the currents flowing through

the PE terminal will not be considered.

 The DUT should be de-energized before the measurement!

 Consider any warning on the display before starting the measurement!

 Do not touch / disconnect the DUT during the measurement or before it is fully

discharged! The message »Discharging…« will be displayed while the voltage on

the DUT is higher than 20 V!

5.2.4 Substitute leakage current

Leakage currents between live conductors and accessible metal parts (housing, screws,

handles etc.) are checked with this test. Capacitive leakage paths are included in the

result too. The test measures the current flowing at a test voltage of 40 V AC and the

result is scaled to the value of a nominal mains supply voltage of 230 V AC.

The instrument measures the insulation resistance between:

- Main test socket (L+N) and PE / (EB/S) test terminals, and

- LN and PE / (EB/S) test sockets.

This function is primarily intended for testing Class I DUTs.

Sub leakage menu

Test parameters for substitute leakage current measurement

OUTPUT Test voltage [40 V]

LIMIT

Maximum current [0.25 mA, 0.50 mA, 0.75 mA, 1.00 mA, 1.50 mA,

2.25 mA, 2.50 mA, 3.50 m

, 4.00 mA, 4.50 mA, 5.00 mA, 5.50 mA,

6.00 mA, 7.00 mA, 8.00 mA, 9.00 mA, none]

TIME Measuring time [2 s, 3 s, 5 s, 10 s, 30 s, 60 s, 120 s, 180 s, none]