Operation Manual

MI 3310 / MI 3310A SigmaGT Measurements
60
Polarity - Standard test procedure
 Select the Polarity test function.
 Select the normal test subfunction.
 Connect tested IEC cord to the instrument (see figure above).
 Press the START key for measurement.
Polarity - Active test procedure
 Select the Polarity test function.
 Select the active test subfunction.
 Connect tested IEC cord to the instrument (see figure above).
 Press the START key for measurement.
 Switch ON the appliance (RCD) within 5 seconds and follow the instructions on the
display.
 Switch ON the RCD again if necessary.
Examples of polarity test result
Displayed results:
Main result ............. PASS/ FAIL, description of fault
Notes:
 Consider any displayed warning before starting test!
 Active polarity test is intended for testing RCD equipped cords where RCD must be
supplied for proper operation.
 In the active polarity test a switchover between phase and neutral at the mains test
socket is performed during the test. Although the switchover time is short it could
happen that the RCD switches off during the switchover. In this case the warning
‘SWITCH ON THE APPLIANCE’ is displayed again and the RCD must be re-
switched ON.
 When active polarity test is enabled in autotest sequence then mains supply voltage
is applied on test socket during earth bond test (if selected in autotest sequence).
5.2.9 Clamp current test
This function enables the measurement of AC currents in a wide range from 0.1 mA up
to 25 A with current clamps. Typical applications are:
- Measuring PE leakage currents through PE conductor in permanently installed
DUTs,
- Measuring load currents in permanently installed DUTs,
- Measuring differential leakage currents in permanently installed DUTs.