Insulation Test - Megger BTDR1500 Manuel Utilisateur

7.3 INSULATION TEST

From the Bridge Menu, if the Insulation test option is selected the insulation resistance
between terminals E and A will be measured with a 100 V insulation test. The insulation
voltage level is selected to prevent the accidental operation of telecom surge arresters that
may be fitted to the line under test. This can be done as a stand-alone operation to help
identify which cables may have a fault on them – then the AUTO test can be used to help
locate that fault. The test is self repeating approximately once every three seconds to allow
for a number of cables to be tested consecutively. See section 7.1 for connection
requirements.
LINE IS GO O D
C
^200. 0M Ω
B
A
100
E
Tes t i ngi nsul at i on- pl ease Pr ess t o ex i t
7.4 LOOP TEST
From the Bridge Menu, a Loop test can be selected for a qualitative test on a telecom cable
to determine if the line will provide reasonable performance. If the loop resistance is too great,
it could indicate that the line is incapable of supplying the 20 mA current required to power
telecomm equipment or too long and therefore too much signal degradation to support Digital
Communications.
16
On selecting exit, you will be returned
to the Bridge Menu.
On selecting this mode, you will be asked to select a 2- or 3-wire mode and on that selection,
the screen will indicate the wiring configuration required between the terminals. See section
7.1 for connection requirements. If any loop resistance is greater than 2 kΩ than an error
message will be displayed, else the test result will be displayed. If a 2-wire test is selected,
the reading will be that of the complete loop between A and B terminals. If a 3-wire test is
selected, the reading will be series leg resistance of the faulty wire (RTF + STF) with an error
message if either loop A-B or loop A-C is > 2 kΩ. The parameters and viewable results are
very similar between the loop test and the auto test SINGLE section display and the same
parameters are adjustable by the same means. See section 7.2.3 for more details.
C
LO OP TEST
B
2 -WI RE 3 - WIRE EXIT
A
Pr ess M ENU t o sel ec t
E
Pr es s t o p r oce ed
3 W loopt est - pl ea s e wa i t
On selecting EXIT, you will be returned to the Bridge Menu.
8.946 km
Tem p: +10 . 0°C Cu 0.60
Uni t :
EXIT