Anritsu Site Master S120A Manual de usuario

MAINTENANCE MANUAL

Site Master™ S120A, S235A, S250A, S251A

Antenna and Cable Analyzers

1. INTRODUCTION

This manual provides maintenance instructions for

Site Master S120A, S235A, S250A, S251A Antenna

and Cable Analyzers. It describes the product and

provides performance verification procedures, parts

replacement procedures, and a replaceable parts list.

2. DESCRIPTION

The Site Master (Figure 1) is a hand held S21 (trans-

mission gain or loss), SWR/RL (standing wave ra-

tio/return loss), and Distance-To-Fault measurement

instrument. It combines a synthesized source, VSWR

Bridge, and receiver on a single printed circuit board

(PCB). An optional power monitor is also available. A

block diagram is shown in Figure 2.

3. PERFORMANCE VERIFICATION

Paragraphs 4 through 9 contain tests that can be

used to verify the performance of the Site Master

models S120A, S235A, S250A, and S251A having

any version of firmware.

3.1. Initial Setup for Testing

1. Press and hold the ESCAPE/CLEAR key,

then press the ON/OFF key to turn on

the Site Master. (This sets the instru-

ment to the factory preset state.)

2. Release the ESCAPE/CLEAR key and use

the Up/Down Arrow key to adjust the

contrast to give a readable display.

Site Master S251A

Figure 1. Site Master S251A

490 JARVIS DRIVE ¨MORGAN HILL, CA 95037-2809 P/N: 10580-00019

REVISION E

PRINTED: OCTOBER 2001

Anritsu Site Master S120A Specs

Provided by www.AAAtesters.com

4. FREQUENCY ACCURACY

The following test can be used to verify the CW fre-

quency accuracy of the Site Master. Measurement

calibration of the Site Master is not required for this

test.

a. Equipment Required:

·Spectrum Analyzer

Anritsu Model MS2602A

b. Procedure:

1. Press and hold the ESCAPE/CLEAR key,

then press the ON/OFF key to turn on

the Site Master. (This sets the instru-

ment to the factory preset state.)

NOTE

Before continuing, allow a five

minute warm up for the internal

circuitry to stabilize.

2. Press the MODE soft key.

3. Use the Up/Down Arrow key to highlight

RF SOURCE, then press ENTER.

4. Press the FREQ soft key.

5. Using the keypad or Up/Down Arrow key

enter 1000.0 MHz (S120A and S251A) or

2000.0 MHz (S235A and S250A), then

press the ENTER key.

6. Connect the RF cable from the Site Mas-

ter Refl Test Port to the RF Input on the

MS2602A.

7. Set up the Spectrum Analyzer as follows:

(a) Press Preset.

(b) Press Center and enter 1 GHz

(S120A and S251A) or 2 GHz (S235A

and S250A).

8. If the Site Master has gone into the hold

mode, press the RUN/HOLD key to make

the measurement.

2 Site Master MM

Figure 2. Site Master Block Diagram

9. Use the Spectrum Analyzer marker to

measure the center of the response. The

frequency should be:

qS120A: 1000 MHz ±75 kHz

qS235A: 2000 MHz ±150 kHz

qS250A: 2000 MHz ±150 kHz

qS251A: 1000 MHz ±75 kHz

5. TRANSMISSION/ISOLATION

VERIFICATION

The following test can be used to verify transmission

test port isolation and the accuracy of transmission

measurements. Measurement calibration of the Site

Master is required for this test.

a. Equipment Required:

·10 dB Attenuator, Weinshel 1R-10

·30 dB Attenuator, Weinshel 1R-30

·Open/Short, Anritsu 22NF50

·50 Ohm Terminations,

Anritsu SM/PL or 28N50-2

Anritsu SM/PLNF or 28NF50-2

·Armored Test Port Extension Cable,

1.5 Meter, N(m) to N(m),

Anritsu 15NN50-1.5A

b. Procedure:

1. Press and hold the ESCAPE/CLEAR key,

then press the ON/OFF key to turn on

the Site Master. (This sets the instru-

ment to the factory preset state.)

NOTE

Before continuing, allow a five

minute warm up for the internal

circuitry to stabilize.

2. Press the MODE soft key.

3. Use the Up/Down Arrow key to highlight

GAIN/INSERTION LOSS, then press

ENTER.

4. Press the SCALE soft key.

5. Press the TOP soft key.

6. On the keypad, press “0”, then press EN-

TER. (Verify the bottom limit is set to

–120 dBm.)

7. Press the MAIN soft key to return to the

Main Menu.

8. Press the OPT soft key.

9. Press the B2 soft key to turn the limit

beep ON.

10. Press the MORE soft key, then the

MAIN soft key to return to the Main

Menu.

11. Press the SCALE soft key.

12. Press the LIMIT soft key.

13. Use the keypad or Up/Down Arrow key

set the limit to –85 dB (S120A) –80 dB

(S251A) or –75 dB (S235A and S250A),

then press ENTER.

14. Press the MAIN soft key to return to the

Main Menu.

15. Press the START CAL key.

16. Follow the instructions on the display to

perform a OSL-THRU-ISOL calibration

using a 22NF50 Open/Short, 28NF50-2

or SM/PLNF Terminations, and

15NN50-1.5A Test Port Extension Cable

(refer to Figure 3).

Site Master MM 3

Figure 3. OSL-THRU-ISOL Calibration Setup

17. Connect a Load (28N50-2 or SM/PL) to

the Trans Test Port and verify that the

noise floor (isolation) is below –85 dB

(S120A) –80 dB (S251A) or –75 dB

(S235A and S250A).

18. Press the MARKER key.

19. Press the M1 soft key, then the EDIT

soft key.

20. Using the keypad or the Up/Down Arrow

key, enter 1000.0 MHz (S120A and

S251A), or 1250 MHz (S235A) or

2000.0 MHz (S250A), then press ENTER.

21. Press the BACK soft key, then the

MAIN soft key to return to the Main

Menu.

NOTE

For the following steps in the pro-

cedure, use only attenuators that

have Type N connectors. The use

of attenuators with other type con-

nectors and adapters will cause

measurement errors.

22. Connect the 10 dB attenuator to the

Trans Test Port (refer to Figure 4) and

verify that the reading is:

qS120A:10dB±2.25 dB @1000 MHz

qS235A:10dB±2.25 dB @1250 MHz

qS250A:10dB±2.25 dB @2000 MHz

qS251A:10dB±2.25 dB @1000 MHz

23. Connect the 10 dB and 30 dB attenuators

in series to the Trans Test Port and

verify that the reading is:

qS120A:40dB±3.25 dB @1000 MHz

qS235A:40dB±3.25 dB @1250 MHz

qS250A:40dB±3.25 dB @2000 MHz

qS251A:40dB±3.25 dB @1000 MHz

6. RETURN LOSS VERIFICATION

The following test can be used to verify the accuracy

of return loss measurements. Measurement calibra-

tion of the Site Master is required for this test.

a. Equipment Required:

·20 dB offset, Anritsu SC5270

·6 dB offset, Anritsu SC5237

·Open/Short, Anritsu 22N50

·50 Ohm Termination,

Anritsu 28N50-2 or SM/PL

b. Procedure:

1. Press and hold the ESCAPE/CLEAR key,

then press the ON/OFF key to turn on

the Site Master. (This sets the instru-

ment to the factory preset state.)

NOTE

Before continuing, allow a five

minute warm up for the internal

circuitry to stabilize

2. Press the MODE soft key.

4 Site Master MM

Attenuator

Figure 4. Test Setup

3. Use the Up/Down Arrow key to highlight

RETURN LOSS, then press ENTER.

4. Press the START CAL key.

5. Use the Up/Down Arrow key to highlight

OSL, then press ENTER.

6. Follow the instructions on the screen to

perform a calibration using a 22N50

Open/Short and 28N50-2 or SM/PL Ter-

mination.

7. Connect the 20 dB offset to the Refl Test

Port and verify that the reading is:

qS120A:20dB±1.7 dB

qS235A:20dB±1.7 dB

qS250A:20dB±1.7 dB

qS251A:20dB±1.7 dB

8. Connect the 6 dB offset to the Refl Test

Port and verify that the reading is:

qS120A:6dB±1.2 dB

qS235A:6dB±1.2 dB

qS250A:6dB±1.2 dB

qS251A:6dB±1.2 dB

7. POWER MONITOR VERIFICATION

If the Power Monitor (Option 5) is installed in the

Site Master, the following test can be used to verify

the accuracy of the power measurements. Measure-

ment calibration of the Site Master is not required

for this test.

a. Equipment Required:

·RF Detector, 10 MHz to 20 GHz,

Anritsu 560-7N50B

·10 dB Attenuator, Weinshel 1R-10

·30 dB Attenuator, Weinshel 1R-30

·RF Reference Source, 0.050 GHz,

Anritsu MA2418A

·DC Power Supply, Anritsu 2000-933

b. Procedure

1. Connect the DC power supply to the

MA2418A Reference Source. (Refer to

Figure 5.)

2. Connect the MA2418A Reference Source

to the input of the 560-7N50B RF detec-

tor.

3. Connect the RF Detector output to the

RF Detector input of the Site Master.

4. Connect the DC power supply to the ap-

propriate line voltage to supply power to

the MA2418A Reference Source.

5. Press and hold the ESCAPE/CLEAR key,

then press the ON/OFF key to turn on

the Site Master. (This sets the instru-

ment to the factory preset state.)

6. Press the MODE soft key.

7. Use the Up/Down Arrow key to highlight

POWER MONITOR, then press ENTER.

8. Press the ZERO soft key to zero the

power monitor.

When complete, ZERO ADJ:ON is dis-

played in the message area.

9. Verify that the power monitor reading is

0.0 dBm ±1 dB.

10. Connect the output of the MA2418A Ref-

erence Source to the two attenuators so

as to add 40 dB of attenuation (Figure 5).

Site Master MM 5

11. Connect the MA2418A Reference Source

and the attenuators to the input of the

560-7N50B RF detector.

12. Verify that the power monitor reading is

now –40.0 dBm ±2 dB.

8. BIAS T (OPTION 10) VERIFICATION

a. Equipment Required:

·AC-DC Adapter Power Supply 40-115

·Open/Short, Anritsu 22NF50

·100 Ohm, 1 Watt load (100 Ohm, 1 Watt

resistor soldered from the center pin to

ground of an N-type connector.)

b. Procedure:

1. Connect the AC-DC Adapter Power Sup-

ply to the battery charging port on the

Site Master (Option 10 only works with

the AC-DC Adapter).

2. Apply AC power to the power supply.

3. Press and hold the ESCAPE/CLEAR key,

then press the ON/OFF key to turn on

the Site Master. (This sets the instru-

ment to the factory preset state.)

4. Press the OPT soft key.

5. Press the B3 soft key to activate the Bias

Tee option.

6. Verify that the display shows BIAS ON,

15.0 V, 0 mA.

7. Connect the 22NF50 short to the Trans-

mission test port.

8. Verify that the display shows BIAS ON,

Fault, and the test port voltage relay

clicks on and off.

9. Remove the short and install the 100

Ohm load.

CAUTION

The 100 Ohm resistor will get hot.

Verify the readings and remove

the 100 Ohm load immediately.

10. Verify that the display shows BIAS ON,

with a reading of 14.8 to 15.3 Volts, and

120 to 160 milliamps.

6 Site Master MM

Figure 5. Power Monitor Verification

9. TERMINATION VERIFICATION

This test verifies the accuracy of the Site Master

SM/PL termination using the precision return loss

mode of the 541XXA Scalar Measurement System.

Measurements of terminations using this mode pro-

vide results that are traceable to the NIST (National

Institute of Standards and Technology) standards for

the precision airline.

a. Equipment Required:

·Scalar Measurement System,

Anritsu 541XXA

·Offset SWR Autotester,

Anritsu 560-97A50-20

·Precision Airline, Anritsu 18N50

·Open/Short, Anritsu 22N50

·50 Ohm Termination, Anritsu 26N50

·Source Adapter, Anritsu 34NN50A

b. Procedure

1. Connect the test equipment as shown in

Figure 6.

2. Press the Power key on the 541XXA to

On.

3. Press the System Menu key.

4. Using the Menu up-down keys: Highlight

RESET, then press the Select key.

5. At the RESET MENU display, use the

Menu up-down keys to highlight RESET

TO FACTORY DEFAULTS, then press

the Select key.

6. Set the signal source for the frequency

range as follows:

(a) Press the Frequency key.

(b) Using the Data Entry Keypad or

Data Entry Knob, set the START

frequency to 0.01 GHz. Press the

Enter key.

Data Entry Knob, set the STOP fre-

quency to 4.0 GHz. Press the Enter

key.

7. Press the Channel 2 Display On/Off key to

Off.

8. Press the Channel 1 Menu key.

Site Master MM 7

541XXA Scalar Measurement System

Connect Dashed Line Connections

When Directed By Procedure

Precision

Air Line

Open/Short

Source

Adapter

50 Ohm

Termination

Offset SWR

Autotester

Termination

under Test

Beadless

End

Figure 6. 541XXA Precision Return Loss Setup

9. Using the Menu up-down keys: Highlight

PRECISION RL, then press the Select

key.

10. At the PRECISION RETURN LOSS

menu display, use the Menu up-down

keys to highlight FINAL, then press the

Select key.

11. Press the Calibration key.

12. At the CALIBRATION menu display, use

the Menu up-down keys to highlight

START CAL, then press the Select key.

13. At the PRECISION RETURN LOSS

CALIBRATION menu display prompt,

connect the Offset SWR Autotester to

Input A, if you have not done so yet.

14. Connect the precision air line to the Off-

set SWR Autotester test port. Position

the air line pointing vertically upward.

Downward or horizontal positions make

connector pin alignment difficult.

NOTE

Ensure that the beadless end of

the precision airline is at the

measurement connection point.

15. Press the Select key when ready.

16. At the PRECISION RETURN LOSS

CALIBRATION menu prompt, connect

the Open to the beadless end of the air-

line. Press the Select key to start the

calibration.

17. Verify that the display resembles that

shown in Figure 7.

CAUTION

During both calibration and

measurement, be sure to properly

align the beadless connector of the

airline. When the connectors are

mis-aligned, a spike will usually

be visible on the display.

18. At the next menu prompt, remove the

Open and connect the Short to the

beadless end of the airline. Press the Se-

lect key to start the calibration process.

19. At the next menu prompt, remove the

Short and connect the 50 Ohm Termina-

tion to the beadless end of the air line.

Press the Select key to start the calibra-

tion process.

20. When the calibration is complete, remove

the 50 Ohm Termination.

21. Connect the SM/PL termination to the

beadless end of the air line and press the

Select key to begin the measurement.

22. Observe that the waveform displayed re-

sembles that shown in Figure 8.

23. Press the Cursor On/Off key to On.

24. Observe the CURSOR menu readout.

The minimum return loss reading for the

SM/PL termination should be 42 dB.

8 Site Master MM

10.0 dB/DIV OFFSET1: PRECSN RL (A)

2: OFF

+0.0dB

2 GHz/DIV

START: 0.0100 GHz

401 pts

STOP: 20.0000 GHz

LEVEL +7.0 dBm

54147A

PRECISION

RETURN LOSS

CALIBRATION

CONNECT OPEN

TO AIRLINE

PRESS SELECT

WHEN READY

Figure 7. Example of a Good Connection

10.0 dB/DIV OFFSET1: PRECSN RL (A)

2: OFF

+0.0dB

2 GHz/DIV

START: 0.0100 GHz

401 pts

STOP: 20.0000 GHz

LEVEL +7.0 dBm

54147A

CURSOR

1: -46.02 dB

PRESS SELECT

FOR

CURSOR MENU

10.0050 GHz

Figure 8. Direct Readout of the Precision Return Loss

10. BATTERY PACK REMOVAL

This procedure provides instructions for removing

the battery pack. Refer to Figure 9 during this proce-

dure.

1. Place the Site Master face up on a work sur-

face.

2. Remove the four corner rubber bumpers (1).

3. Remove the four screws (PN 900-811) (2).

4. While holding the two halves of the Site Mas-

ter together, turn it over and set it face down

on the work surface.

CAUTION

In the next step, the Main RF PCB

assembly (3) and test port panel (4)

must stay with the front panel.

5. Remove the bottom half (5) and fold it over to

lay upside down on the work surface.

6. Disconnect the battery connector from J6 (6)

of the Main RF PCB assembly (3).

7. Remove the four screws (7) holding the bat-

tery bracket (8) in place and lift the bracket

clear.

8. Remove the battery assembly (9).

Site Master MM 9

Test

Ports

2 (4 places)

1 (4 places)

RF Det Refl Trans

CAUTION

+20 dBm MAX

40 VDC MAX

AVOID STATIC

DISCHARGE

12.5-15V DC

(850 mA) Serial

Interface

Ext Pwr Batt Chg

N274

Raised

Wedge

Detail A

(4 places)

310

Figure 9. Site Master Battery Removal

11. BATTERY PACK REPLACEMENT

This procedure provides instructions for replacing

the battery pack. Refer to Figure 9 during the proce-

dure.

1. Install the new battery assembly (9).

2. Replace the battery bracket (8) and insert

the four screws (7) to hold the battery

bracket in place.

3. Reattach the battery connector to J6 (6) on

the main RF PCB assembly (3).

4. Set the bottom half in place.

5. While holding the two halves together, turn

the Site Master over and lay it face up on the

work surface.

6. Reinstall the four screws (2).

7. Install the rubber bumpers (1) on all four

corners of the instrument.

NOTE

Corner bumpers can only mount one

way. That is, the raised-wedged area

on the bumper inside (Detail A) at-

taches to the front cover.

12. BATTERY DISPOSAL

The battery used in the Site Master is a recharge-

able nickel-cadmium (NiCd) battery and is covered

by the Battery Directive (91/157/EEC). As such, the

battery is marked as follows to indicate controlled

disposal.

This marking indicates that

the battery is a recyclable

product.

This marking indicates that

the battery requires separate

collection and shows the

chemical system (Nickel/

Cadmium).

This marking indicates the

heavy-metal component

concentration as a percentage

of battery cell weight.

Spent nickel-cadmium batteries are valuable re-

sources. Because they are reusable, do not throw

them away. Arrange for proper return for recycling

in your locality. If you do not have access to proper

disposal methods, return the battery pack to your

Anritsu service center. Service centers will dispose of

the unit at no charge. Anritsu service centers are

listed in Table 2 on page 13.

13. KEY PAD MEMBRANE REPLACEMENT

This procedure provides instructions for replacing

the key pad membrane. Refer to Figure 9 during the

procedure.

1. Place the Site Master face up on a work sur-

face.

2. Remove the four corner rubber bumpers (1).

3. Remove the four screws (PN 900-811) (2).

4. While holding the two halves of the Site

Master together, turn it over and set it face

down on the work surface.

CAUTION

In the next step, the PCB assembly

(3) and test port panel (4) must stay

with the front panel.

5. Remove the bottom half (5) and fold it over to

lay upside down on the work surface.

6. Disconnect the battery connector from J6 (6).

7. Remove the screw (10) located on the bottom

side of the main PCB assembly next to the

RF Bridge assembly.

8. Pull the PCB Assemblies clear from the top

half of the case.

9. Lift the damaged keypad membrane clear

from the keypad assembly.

10. Install a new membrane.

10 Site Master MM

Component % of Cell

Weight

Nickel 19 to 26%

Cadmium 17 to 22%

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