Operation Manual

MI 3310 / MI 3310A SigmaGT Measurements

Examples of earth bond resistance measurement results

Displayed results:

Main result ............. earth bond resistance

Note:

 Consider displayed warnings before starting measurement!

5.2.1.1 Compensation of test leads resistance (firmware release 1.24 and up)

Test leads compensation is required to eliminate the influence of test leads resistance

and instrument’s internal resistance. If a compensation value is stored this is indicated

in the message C.

Compensation of test leads resistance procedure

 Select the Earth Bond function.

 Set test parameters.

 Connect EB/S test probe to the instrument and short it with PE pin of test socket.

 Press the CAL (F3) key for measurement.

 If the calibration was performed successfully, result 0.00  is displayed.

Notes:

 5.00  is the limit value for resistance compensation. If the resistance is higher than

the calibration value is reset to the default value and the compensation message

disappears.

 Both 200 mA and 10 A earth bond functions are compensated at the same time.

 The lead compensation is very important to obtain correct results especially if long

test leads are used.

5.2.2 Insulation resistance

The insulation resistance test checks the resistance between live conductors and

accessible conductive parts of the DUT connected to PE or isolated. This test can

disclose faults caused by pollution, moisture, deterioration of insulation material etc.

The instrument measures the insulation resistance between:

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

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

This function is primarily intended for testing Class I DUTs.