Operation
Section 1
Page 2
The Digital World – Some Differences Between
Analog and Digital Testing
1.2 Each 900/900M Series test set contains a
computer that tests the line and displays the
results. Read the display carefully. The results may look
different and have more information than what you’re used
to.
1.3 Analog meters have relatively low high-resistance
limits; for example, some can read up to 3
Mohms, while others can read up to 30 Mohms. In
comparison, the digital 900/900M Series unit can read high
resistance faults up to 100 Mohms.
1.4 With an analog meter, you have to manually move
the clips from across the pair to ring-to-ground
and tip-to-ground, to determine if the fault is a short or
ground. With just one hookup, the 900/900M Series test set
tests the pair tip-to-ring, ring-to-ground and tip-to-ground.
The unit displays the fault and its value on the display
screen (see example, next page) at the press of a key on the
unit’s front panel.
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