3M Dynatel 965AMS Bedienungsanleitung

Andere Handbücher für Dynatel 965AMS

2

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February 2009

78-8140-2658-5-A

Future-Proof Testing Platform

3

Dynatel™Advanced Modular System 965AMS

30-Megahertz Spectrum Analyzer

DSL User’s Guide

2

3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer

3

3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer

Contents

DSL (Digital Subscriber Line) ..........................................................5

DSL Loss ..................................................................................................5

DSL Noise.................................................................................................9

DSL Spectrum Analyzer .........................................................................13

Resistance Balance..................................................................................17

DSL Impulse Noise.................................................................................19

4

3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer

5

3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer

DSL (Digital Subscriber Line)

The DSL functions include: DSL Loss, DSL Noise, DSL

Spectrum Analyzer, Resistive Balance, and DSL Impulse Noise.

DSL>DSL Loss

Use DSL Loss function to measure the amount of loss in a

circuit at a speciﬁc frequency. This is typically accomplished

by sending tone with another 965AMS, a 3M™Dynatel™Far

End Device (FED), or test equipment that is capable of sending

wideband tone from 20 kHz to 30 MHz.

DSL>DSL Loss>Hook-Up

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6

3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer

DSL>DSL Loss>Operation

1. Press the blue DSL key

to enter the DSL function.

Use the up and down arrow

keys to select DSL Loss.

Use a tone source at the

far end that is capable of

sending a known output

level such as a 965AMS.

Use 0dBm as the output

level or follow your method

of test.

2. Press DSL Setup to select

the type of service.

3. Use the up and down

arrow keys to select the

type of service that you are

measuring.

4. Press OK when ﬁnished.

7

3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer

DSL>DSL Loss>Operation

5. Press OK to make the

measurement.

6. The results of the

measurement will be

displayed as a –dBm level

at a speciﬁc frequency.

DSL>DSL Loss>Application Notes

DSL Loss measures the signal lost from a tone transmitter

(965AMS, 3M™Dynatel™Far End Device (FED) or other

capable device) to the measuring 965AMS.

High loss is an indication of:

1. A loop that is too long for the potential service.

2. Bridge tap.

To get a complete picture of loss, it is recommended that you use

a FED that will generate a sweep of frequency for the service

type. The sweep will indicate either a good circuit, high loss or

dips in the reading can be an indication of bridge tap. The image

8

3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer

below is a sweep that was performed with a 965AMS, a 3M™

Dynatel™Far End Device FED II and the selected service was

ADSL2.

Look at the before and after for these two readings. When

the bridge tap is removed then the slope no longer displays

frequency dips.

With 500 feet of bridge tap With bridge tap removed

9

3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer

DSL>DSL Noise

Use DSL Noise function to measure the Longitudinal or

Metallic Noise on a DSL line.

DSL>DSL Noise>Hook-Up

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DSL>DSL Noise>Operation

1. Press the blue DSL key

to enter the DSL function.

Use the up and down arrow

keys to select DSL Noise.

2. Press DSL Setup to select

the type of service.

10

3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer

DSL>DSL Noise>Operation

3. Use the up and down

arrow keys to select the

type of service that you are

measuring.

4. Press OK when ﬁnished.

5. Press OK to start the

measurement for DSL

noise.

6. Press Select Longitudinal to

measure longitudinal noise.