3.
Close the MCC CLAMP around the conductor under test. Ensure the arrow on the side of the jaw is pointing in the
same direction as the arrow on the MVC CLAMP.
4.
Close the MVC CLAMP around the conductor under test. Ensure the arrow on the side of the jaw is pointing in the
same direction as the arrow on the MCC CLAMP.
5.
Ensure a minimum separation of 100 mm between the MCC CLAMP and MVC CLAMP.
6.
Set the rotary selector switch to the
position.
7.
DET4TC2 and DET4TCR2 only:
Select the desired test frequency using the
Hz
button.
8.
Press and release the
TEST
button [by holding the
TEST
button, the resistance measurement will be continually
updated].
9.
The instrument will perform pre-measurement checks, the status of which will be indicated on the display.
10. The stakeless resistance reading will be displayed as shown in Figure 36.
Figure 36: example resistance reading using two-clamp stakeless method
11. Under certain circumstances, the instrument may display a noise warning as shown:
This means that interference has been detected which may impair the accuracy of the measurement. In particular, the reading
could be lower than the actual resistance. The resistance of the electrode or system must be verified by an alternative method.
Note
:
The instrument will display the warning triangle above 2 A – no “Stakeless” testing is possible under this condition.
The instrument will display the warning triangle and an over-range condition above 20 A – no “Stakeless” testing is
possible under this condition.
Ensure that the MVC CLAMP and MCC CLAMP jaw mating surfaces are free of dust and contamination and that
they contact completely when the MVC CLAMP and MCC CLAMP are closed.
Currents carried by conductors in close proximity to the MVC CLAMP and MCC CLAMP may affect calibration and
reduce the accuracy of measurements made.
If the MVC CLAMP opens at any time after the
TEST
button is pressed, the test will be aborted.
MCC CLAMP calibration (DET3TC, DET4TC2 and DET4TCR2)
The MCC CLAMP should be calibrated once at each test site to take into account the effects of transportation, temperature
and humidity on the MCC CLAMP.
1.
Ensure the rotary selector switch is in the
OFF
position.
2.
Connect the instrument as shown in Figure 37.
3.
Ensure that the MCC CLAMP is not clamped around a conductor.
4.
Press and hold the
TEST
button and switch instrument ON to the
A
setting using the selector switch.
5.
Release the
TEST
button.
