HP HP 8712ET User manual

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CATV Quick Start Guide
HP 8712ET/ES and HP 8714ET/ES
HP Part Number 08714-90021
Printed in USA October 1998
© Copyright 1998 Hewlett-Packard Company
This quick start guide provides basic instructions on how to make measurements that test the quality
of coaxial cables. Refer to the Option 100 Fault Location and Structural Return Loss Measurement
User’s Guide Supplement for more detailed information. Also, please refer to your analyzer’s User’s
Guide for safety, warranty, and assistance information.
NOTE This quick start guide assumes the use of an HP 8712ET or HP 8714ET. If you are using an HP 8712ES or
HP 8714ES, some key presses and displays will be slightly different.
To Make a Fault Location Measurement
1. Choose the measurement parameters or recall an instrument state.
2. Calibrate the analyzer. 3. Connect the equipment.
PRESET BEGIN
Cable
Fault Location
Start Distance
XX ENTER
Stop Distance
XX ENTER
CAL
Full Band Cal
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4. View the fault location results. 5. Interpret the measurement / save results.
To Make an SRL Measurement
1. Choose the measurement parameters or recall an instrument state.
2. Calibrate the analyzer. 3. Verify the calibration.
Leave load connected.
Directivity is good if trace is below −50 dB.
Wiggle (move) the test-lead cable. The test-lead
cable is good if the trace remains stable.
MARKER
Marker Search
Max Search
Search
Mkr
−
> Max
SAVE RECALL
Define Save
Data ON
Prior Menu
Save State
PRESET BEGIN
Cable
SRL
CAL
Full Band Cal
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4. Connect the equipment. 5. Measure the connector.
6. Scan the cable. 7. Interpret the measurement / save results.
BEGIN
Cable
SRL
Connector Model
Measure Connector
BEGIN
Cable
SRL
SRL Cable Scan
MARKER
Marker Search
Max Search
Search
Mkr
−
> Max
SAVE RECALL
Define Save
Data ON
Prior Menu
Save State
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If Measurement Results Were Poor
The following results indicate some specific problems you may encounter. The 2nd and 3rd
problem/solution are displayed using the “connector fault” feature. Refer to your Option 100 User’s
Guide Supplement for more information.
Problem 1 Solution 1
The measured amplitude and distance of a 1000
ft. cable are wrong. (Cable is not terminated in
this example.)
Change the “velocity factor” and “cable loss”
values to the values specified by the cable
manufacturer.
Problem/Solution 2 Problem/Solution 3
The cable is bent near the connector (indicated
by the 2nd bump in the “connector fault”
response).
Solution: Remove the bend.
The cable connector is failing or the cable is
poorly prepared. Connector compensation fails
to improve response.
Solution: Clean or replace the connector.
BEGIN
Cable
Fault Location
CAL
Velocity Factor
Cable Loss
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