40
9.6
Two-clamp stake-less measurement (MFT1835 only)
.1 Ensure the rotary selector switch is in the OFF position.
.2 Connect the instrument as shown in Figure 35.
Instrument connection for two-clamp stake-less measurement
Electrode
under test
I
CAT IV
300V
12-15V
1.2A
H
E
S
V
.3 With this method, the ICLAMP may be positioned directly around the Electrode under test or around the Earth Conductor itself.
The ICLAMP should be positioned below the VCLAMP. Ensure the arrow on the side of the jaw is pointing in the same direction
as the arrow on the VCLAMP.
.4 Close the VCLAMP 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 ICLAMP.
(If one of the clamps is reversed, the main display shows ‘Err’ momentarily with ‘REV’ on the auxillary display together with the V
clamp symbols).
.5 Ensure a minimum separation of 100 mm between the ICLAMP and VCLAMP.
.6 Set the rotary selector switch to the
position.
.7 Press and release the TEST button. The instrument will perform pre-measurement checks, the status of which will be indicated on
the display.
.8 The stake-less resistance reading will be displayed.
Note:
■
The instrument will display the warning triangle above 2 A – no “Stakeless” testing is possible under this condition.
■
Ensure that the VCLAMP and ICLAMP jaw mating surfaces are free of dust and contamination and that they contact
completely when the VCLAMP and ICLAMP are closed.
■
Currents carried by conductors in close proximity to the VCLAMP and ICLAMP may affect calibration and reduce the
accuracy of measurements made.
■
If the VCLAMP opens at any time after the TEST button is pressed, the test will be aborted.
