MI 3321 MultiservicerXA
Single tests in PAT testing mode
49
Examples of earth bond resistance measurement results
Displayed result:
Main result ............. earth bond resistance
Notes
:
Consider displayed warnings before starting measurement!
HW 4.x or higher :
When PRCD test is enabled in autotest sequence then mains supply voltage is
applied on test socket during earth bond test (if selected in autotest sequence).
6.2.1.1
Compensation of test leads resistance
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
S/C1 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,
C
√
is displayed.
Notes:
5.00
is the limit value for resistance compensation. If the resistance is higher
then 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.
6.2.2
Insulation resistance
The insulation resistance test checks the resistance between live conductors and
earthed (or isolated) accessible metal parts of an DUT. This test can disclose faults
caused by pollution, moisture, deterioration of insulation metal etc.
The instrument measures the insulation resistance between:
- Mains test socket (L+N) and PE / (S/C1) test terminals, and
- LN and PE / (S/C1) test outputs.
