Agilent Technologies 8712ET/ES Manual de usuario
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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
© Copyright 1998–2000 Agilent Technologies, Inc.
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
XX
ENTER
Stop Distance
XX
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
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
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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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