Agilent Technologies 8712ET/ES Bedienungsanleitung

-1-

Cellular Antenna Quick Start Guide

Agilent Technologies

8712ET/ES and 8714ET/ES

Agilent Part Number 08714-90022

Printed in USA June 2000

Supersedes October 1998

This quick start guide provides basic instructions on how to verify the performance of cellular antenna

systems. 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 8712ET or 8714ET. If you are using an 8712ES or 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. Reduce the interference. 3. Calibrate the analyzer.

PRESET BEGIN

Cable

Fault Location

Start Distance

ENTER

Stop Distance

ENTER

BEGIN

Cable

Fault Location

Band Pass

Center Frequency

900

MHz

CAL

Full Band Cal

FREQ

Fault Loc Frequency

Band Pass Max Span

300

MHz

AVG

System Bandwidth

Narrow 250 Hz

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4. Connect the equipment. 5. Interpret the measurement / save results.

If Measurement Results Were Poor

The following results indicate a speciﬁc problem you may encounter. Refer to your Option 100 User’s

Guide Supplement for more information.

Problem Solution

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.

MARKER

Marker Search

Max Search

Mkr

−

> Max

SAVE RECALL

Deﬁne Save

Data ON

Prior Menu

Save State

CAL

Velocity Factor

Cable Loss

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To Make a Return Loss Measurement

1. Choose the measurement parameters or recall an instrument state.

(or )

2. Calibrate the analyzer. 3. Connect the equipment.

(or )

4. Interpret the measurement / save results. 5. View SWR / save results.

PRESET MEAS 1

Reﬂection

S11

AVG

System Bandwidth

Narrow 250 Hz

CAL

1-Port

User 1-Port

MARKER

Marker Search

Min Search

Mkr

−

> Min

SAVE RECALL

Deﬁne Save

Data ON

Prior Menu

Save State

FORMAT

SWR

SCALE

Scale/Div

0.2

ENTER

SAVE RECALL

Save State

-4-

To Make an Insertion Loss Measurement

1. Choose the measurement parameters or recall an

instrument state.

(or )

2. Calibrate the analyzer. 3. Connect the

equipment.

(or )

4. Interpret the measurement / save results. 5. Calculate insertion loss and end of cable.

Insertion Loss Calculation

= marker value ÷2

= 7.36 dB ÷2 = 3.68 dB

End of Cable Calculation

=λ ÷ 2 where:

λ(wavelength) = c ×Vf÷∆f

∆f = 10 MHz between bumps

Vf(velocity factor) ≈ 1.0

c≈109ft/sec

λ= 109ft/sec ÷107cycles/sec = 100 ft

= 100 ft ÷2 = 50 ft

PRESET MEAS 1

Reﬂection

S11

AVG

System Bandwidth

Narrow 250 Hz

CAL

1-Port

User 1-Port

MARKER 900

MHz

SAVE RECALL

Deﬁne Save

Data ON

Prior Menu

Save State

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