Agilent Technologies AuroraPresto, User Manual

Page: 121 / 266

Section 3 - Physical Layer Tests
Issue 7 - 05/02 4-21
DMM Tests
Warning
When connecting to the line, especially when using
crocodile clips, special care must be taken as high voltages
may be present on the line and there may be a danger of
electrocution.
Caution: TDR/DMM Tests
When performing Capacitance and Load Coil tests make
sure that voltage is NOT present on the line, if a voltage is
present on the line you may damage
Aurora Presto
.
The Current test is intended for low DC current
measurement only. It is protected by a 400mA fuse.
The TDR/DMM module has protection devices fitted at
manufacture that cannot be reset by the user. If the
protection devices are activated
Aurora Presto
must be
returned to Agilent Technologies for repair.
Your
Aurora Presto
may not have the DMM Tester option.
For details contact your Agilent Technologies
representative.
You can also run a DMM test from the
Auto Test Mode
screen. See Auto Tests on page 4-3 for more information.
DMM (Digital Multimeter) and TDR (Time Domain
Reflectometer) tests are used to test the Electrical Layer of
the local loop.
The DMM test enables you to:
• measure ADSL line voltage and other voltages
(AC/DC)
• find capacitive problems
• find resistive problems.
481801-7.book Page 21 Thursday, May 23, 2002 10:46 AM