Anritsu MS2711 Manuel utilisateur

MAINTENANCE MANUAL

MS2711

Hand Held

Spectrum Analyzer

1. INTRODUCTION

This manual provides maintenance instructions for

the MS2711 Spectrum Analyzer. It describes the

product and provides performance verification proce-

dures, parts replacement procedures, and a replace-

able parts list.

2. DESCRIPTION

The MS2711 Spectrum Analyzer (Figure 1) is a syn-

thesizer-based hand held spectrum analyzer that

provides quick and accurate signal results. Measure-

ments can be easily made using the main instrument

functions: frequency, span, amplitude and band-

width. A simplified block diagram is provided in Fig-

ure 2.

3. PERFORMANCE VERIFICATION

PROCEDURES

Paragraphs 4 through 7 contain tests that can be

used to verify the performance of the MS2711 Spec-

trum Analyzer having any version of firmware.

3.1. Display Contrast Adjustment

1. Press and hold the ESCAPE/CLEAR key,

then press the ON/OFF key to turn on the

Spectrum Analyzer. (This sets the instru-

ment to the factory preset state.) When

the instrument has completed the self

test, press the ENTER key to continue.

2. Use the Up/Down arrow key to adjust

the display contrast if necessary and

press the ENTER key to continue.

HOLD

RUN

START

CAL AUTO

SCALE

SAVE

SETUP RECALL

SETUP

LIMIT

MARKER

SAVE

DISPLAY RECALL

DISPLAY

MODE

FREQ/SPAN

AMPLITUDE BW/SWEEP

SYS

ENTER

CLEAR

ESCAPE

OFF

MS2711

Figure 1. MS2711 Hand Held Spectrum Analyzer

490 JARVIS DRIVE ·MORGAN HILL, CA 95037-2809 P/N: 10580-00027

REVISION A

PRINTED: NOVEMBER 1999

Anritsu MS2711 Spectrum Master Specs

Provided by www.AAATesters.com

4. FREQUENCY ACCURACY

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

quency accuracy of the Spectrum Analyzer.

a. Equipment Required:

·Anritsu 68047C Synthesized Signal

Source, with options 11 and 15A

·10 MHz Reference Standard

b. Procedure:

1. Connect the 10 MHz reference source to

the Anritsu 68047C Synthesized Signal

Source.

2. Connect the output of the source to the

MS2711 RF Input.

3. Connect the external power supply

(Anritsu part number 40-115) to the

MS2711.

4. Press and hold the ESCAPE/CLEAR key,

then press the ON/OFF key to turn on the

Spectrum Analyzer. (This sets the instru-

ment to the factory preset state.)

5. Turn on the 10 MHz reference source and

the Anritsu 68047C Synthesized Signal

Source.

6. Set the 68047C output to 1000 MHz,

with an RF output level of 0 dBm.

NOTE

Before continuing, allow a 30-min-

ute warm up for the internal cir-

cuitry to stabilize.

7. On the MS2711, press the AMPLITUDE

key and the REF LEVEL soft key.

8. Enter 20 and press the ENTER key to set

the Reference Level to 20 dBm.

9. Press the FREQ/SPAN key and the

CENTER soft key.

10. Enter 1000 and press the ENTER key to

set the center frequency to 1000 MHz.

11. Press the SPAN soft key and enter 0.1.

Press the ENTER key to set the span to

0.100 MHz.

12. Press the BW/SWEEP key.

2 MS2711 HHSA MM

HI-BAND

LO-BAND

IF AMP LOG

CPU

INPUT

0-50dB

REF

RBW

VCO1 VCO2

VCO3 VCO4

A/D

VBW

INPUT ATTENUATOR

AND LIMITER

N N

Figure 2. MS2711 Spectrum Analyzer Block Diagram

13. Press the RBW soft key and use the

Up/down arrow key to select 10 kHz.

Press ENTER to set the resolution band-

width to 10 kHz.

14. Press the VBW soft key and use the

Up/down arrow key to select 3 kHz. Press

ENTER to set the video bandwidth to 3

kHz.

15. Press the MARKER key, then the M1 soft

key.

16. Select the EDIT soft key and use the

Up/down arrow key to center the marker

on the waveform. Verify that the marker

frequency is 1000 MHz, ±2 kHz.

5. PHASE NOISE VERIFICATION

a. Equipment Required:

·Anritsu 68047C Synthesized Signal

Source, with options 11 and 15A

b. Procedure:

1. Connect the output of the source to the

MS2711 RF Input.

2. Connect the external power supply

(Anritsu part number 40-115) to the

MS2711.

3. Press and hold the ESCAPE/CLEAR key,

then press the ON/OFF key to turn on the

Spectrum Analyzer. (This sets the instru-

ment to the factory preset state.)

NOTE

Before continuing, allow a 30-min-

ute warm up for the internal cir-

cuitry to stabilize.

4. Set the 68047C output to 1000 MHz,

with an RF output level of –30 dBm.

5. Press the BW/SWEEP key.

6. Press the RBW soft key and use the

Up/down arrow key to select 10 kHz.

Press ENTER to set the resolution band-

width to 10 kHz.

7. Press the VBW soft key and use the

Up/down arrow key to select 3 kHz. Press

ENTER to set the video bandwidth to 3

kHz.

8. On the MS2711, press the FREQ/SPAN

key and the CENTER soft key.

9. Enter 1000 and press the ENTER key to

set the center frequency to 1000 MHz.

10. Press the SPAN soft key and enter 0.100.

Press the ENTER key to set the span to

0.100 MHz.

11. Press the AMPLITUDE key.

12. Press the REF LEVEL soft key and enter

–27. Press ENTER to set the reference

level to –27 dBm.

13. Press the MARKER key, then the M1 soft

key.

14. Press EDIT and enter 1000. Press ENTER

to set the M1 marker frequency to 1000

MHz.

15. Press the BACK soft key and the M2 soft

key.

16. Press EDIT and enter 1000.030. Press

ENTER to set the M2 marker frequency to

1000.030 MHz (30 kHz higher than the

center frequency).

17. Press the DELTA (M2-M1) soft key.

18. Press the RUN/HOLD key and read and

record the amplitude of the signal at the

M1 30 kHz offset.

19. Press the RUN/HOLD key to read and re-

cord five values, then calculate the aver-

age of the five recorded values.

20. Add –40 dB to the average value and ver-

ify that the result is £–74 dBc/Hz.

(For example: –35 dBc measured +

(-40 dB) = –75 dBc/Hz.)

6. MEASUREMENT ACCURACY

Measurement accuracy involves testing the MS2711

over three frequencies at four power levels. Table 1

provides a guide to the frequencies, power levels and

reference levels required for each measurement, and

can be used to record the readings.

a. Equipment Required:

·Anritsu 68047C Synthesized Signal

Source, with options 11 and 15A

MS2711 HHSA MM 3

b. Procedure:

1. Connect the output of the source to the

MS2711 RF Input.

2. Connect the external power supply

(Anritsu part number 40-115) to the

MS2711.

3. Press and hold the ESCAPE/CLEAR key,

then press the ON/OFF key to turn on the

Spectrum Analyzer. (This sets the instru-

ment to the factory preset state.)

NOTE

Before continuing, allow a 30-min-

ute warm up for the internal cir-

cuitry to stabilize.

4. Press the BW/SWEEP key.

5. Press the RBW soft key and use the

Up/down arrow key to select 10 kHz.

Press ENTER to set the resolution band-

width to 10 kHz.

6. Press the VBW soft key and use the

Up/down arrow key to select 3 kHz.

Press ENTER to set the video bandwidth

to 3 kHz.

7. Press the FREQ/SPAN key.

8. Press the SPAN soft key and enter 5, then

press the ENTER key to set the span to 5

MHz.

9. Press the AMPLITUDE key.

10. Press the REF LEVEL soft key and enter

20. Press ENTER to set the reference level

to +20 dBm.

11. Press the FREQ/SPAN key and the

CENTER soft key.

12. Enter 1000 and press the ENTER key to

set the center frequency to 1000 MHz.

13. Set the 68047C output to 1000 MHz and

the power level to +10 dBm.

14. Press the MARKER key, then the M1 soft

key.

15. Select the MARKER TO PEAK soft key to

position the marker at the center of the

response for the test frequency.

NOTE

Optionally, markers 2, 3 and 4

may be set to OFF for a cleaner

display.

16. Verify that the M1 reading is ±2dB

maximum from the input signal.

17. Set the 68047C power level to –10 dBm.

18. Verify that the M1 reading is ±2dB

maximum from the input signal.

19. Press the AMPLITUDE key.

20. Press the REF LEVEL soft key and enter

–20. Press ENTER to set the reference

level to –20 dBm.

21. Set the 68047C power level to –30 dBm.

22. Verify that the M1 reading is ±2dB

maximum from the input signal.

23. Set the 68047C power level to –50 dBm.

24. Verify that the M1 reading is ±2dB

maximum from the input signal.

25. Repeat steps 9 through 24 for frequen-

cies of 1800 MHz and 2700 MHz.

4 PRELIMINARY MS2711 HHSA MM

Freq

(MHz) Power Level

(dBm) MS2711 Ref

Level (dBm) M1 Reading

1000

+10 +20

–10 +20

–30 –20

–50 –20

1800

+10 +20

–10 +20

–30 –20

–50 –20

2700

+10 +20

–10 +20

–30 –20

–50 –20

Table 1. Measurement Accuracy Settings

7. POWER MONITOR VERIFICATION

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

Spectrum Analyzer, the following test can be used to

verify the accuracy of the power measurements.

Measurement calibration of the Spectrum Analyzer

is not required for this test.

a. Equipment Required:

·RF Detector, 10 MHz to 20 GHz,

Anritsu 560-7N50B

·10 dB Attenuator, Weinschel 1R-10

·30 dB Attenuator, Weinschel 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 3, page 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 MS2711 Spec-

trum Analyzer.

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

Spectrum Analyzer. (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 3).

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.

MS2711 HHSA MM 5

DC Power Supply 2000-933

Attenuators

Spectrum Analyzer w/ Option 5 Installed

MA2418A

Reference Source

560-7N50B

RF Detector

15-24V DC

20 mA

MA2418A Reference Source

50 MHz, 50

0dBm W

HOLD

RUN

START

CAL AUTO

SCALE

SAVE

SETUP RECALL

SETUP

LIMIT

MARKER

SAVE

DISPLAY RECALL

DISPLAY

MODE

FREQ/SPAN

AMPLITUDE BW/SWEEP

SYS

ENTER

CLEAR

ESCAPE

OFF

MS2711

Figure 3. Power Monitor Verification

8. BATTERY PACK REMOVAL AND

REPLACEMENT

This procedure provides instructions for removing

and replacing the Spectrum Analyzer battery pack.

NOTE

The following procedures apply to many

similar instruments. Photos and illustra-

tions may show instruments other than the

MS2711 Spectrum Analyzer.

1. With the Spectrum Analyzer standing up-

right on a stable surface, locate the battery

access door (Figure 4).

2. Lift up the access door handle and rotate it

90 degrees counterclockwise, as illustrated in

Figure 5.

3. Lift the door and remove, as illustrated in

Figure 6.

4. Grasp the battery lanyard and pull the bat-

tery straight up and out of the unit, as illus-

trated in Figure 7.

5. Replacement is the opposite of removal. Note

the orientation of the battery contacts, and

be sure to insert the new battery with the

contacts facing the rear of the unit (Figure

8).

6 MS2711 HHSA MM

BATTERY ACCESS DOOR

Figure 4. Battery Access Door Location

Figure 5. Rotate the Battery Access Door Handle

Figure 6. Removing the Battery Access Door

Figure 7. Removing the Battery

BATTERY CONTACTS

Figure 8. Battery Orientation

9. BATTERY INFORMATION

The following information relates to the care and

handling of the Spectrum Analyzer battery, and

NiMH batteries in general.

·The Nickel Metal Hydride (NiMH) battery sup-

plied with the Spectrum Analyzer is shipped in

a discharged state. Before using the Spectrum

Analyzer, the internal battery must first be

charged for three hours, either in the Spectrum

Analyzer or in the optional battery charger

(Anritsu part number: 2000-1029).

·Use only Anritsu approved battery packs.

·Recharge the battery only in the Spectrum Ana-

lyzer or in an Anritsu approved charger.

·With a new NiMH battery, full performance is

achieved after three to five complete charge and

discharge cycles.

·When the Spectrum Analyzer or the charger is

not in use, disconnect it from the power source.

·Do not charge batteries for longer than 24

hours; overcharging may shorten battery life.

·If left unused a fully charged battery will dis-

charge itself over time.

·Temperature extremes will affect the ability of

the battery to charge: allow the battery to cool

down or warm up as necessary before use or

charging.

·Discharge an NiMH battery from time to time

to improve battery performance and battery life.

·The battery can be charged and discharged

hundreds of times, but it will eventually wear

out.

·The battery may need to be replaced when the

operating time between charging becomes no-

ticeably shorter than normal.

·Never use a damaged or worn out charger or

battery.

·Storing the battery in extreme hot or cold

places will reduce the capacity and lifetime of

the battery.

·Never short-circuit the battery terminals.

·Do not drop, mutilate or attempt to disassemble

the battery.

·Do not dispose of batteries in a fire!

·Batteries must be recycled or disposed of prop-

erly. Do not place batteries in household gar-

bage.

·Always use the battery for its intended purpose

only.

MS2711 HHSA MM 7

Figure 9. Spectrum Analyzer Battery

10. FRONT PANEL ASSEMBLY REMOVAL

AND REPLACEMENT

This procedure provides instructions for removing

and replacing the Spectrum Analyzer front panel as-

sembly. With the front panel assembly removed, the

LCD display, keypad PCB, keypad membrane, and

main PCB assemblies can be removed and replaced.

1. Place the Spectrum Analyzer face up on a

work surface.

2. Remove the four rubber corner bumpers by

carefully sliding the bumpers off of the case

corners (Figure 12).

3. With the bumpers removed, the access holes

for the case screws are revealed. Use a Phil-

lips screwdriver to remove the four screws

securing the two halves of the Spectrum An-

alyzer case together.

4. Carefully lift up on the right side (as viewed

from the front) of the front half of the case

and begin to separate the two halves.

CAUTION

Do not force or pull the two halves of the

case apart as there are delicate cables at-

tached between the two halves that must

be disconnected first.

5. Carefully depress the latch tab and discon-

nect the LCD display cable from J12 on the

main PCB.

6. Carefully disconnect the keypad interface ca-

ble from J1 on the main PCB.

7. Carefully disconnect the LCD display

backlight cable from J15 on the main PCB.

8. Remove the front panel assembly.

9. Reverse the above steps to replace the front

panel assembly.

NOTE

The corner bumpers only mount one way.

That is, the raised area inside one end of

the bumper (Figure 11) is made to conform

to the contour of the front cover only.

8 MS2711 HHSA MM

Figure 10. Removing the Corner Bumpers

J1 J15

J12

Figure 11. Spectrum Analyzer Front Panel Cable Con-

nections

RAISED AREA

Figure 12. Corner Bumper Detail

11. LCD ASSEMBLY REPLACEMENT

This procedure provides instructions for removing

and replacing the Liquid Crystal Display (LCD) once

the front panel assembly has been separated from

the Spectrum Analyzer.

1. Remove the front panel assembly as directed

in section 10.

2. Place the front panel assembly face down on

a protected work surface.

3. Remove the 14 Phillips screws that attach

the backing plate to the front panel assem-

bly.

4. Release the LCD display cable from the re-

taining clip on the front panel backing plate.

5. Remove the front panel backing plate, care-

fully feeding the LCD cable through the ac-

cess hole to avoid damage to the cable or

connector.

6. Remove the rubber cushion pad from the

LCD assembly and remove the assembly.

7. Reverse the above steps to install the re-

placement assembly.

12. KEY PAD PCB REPLACEMENT

This procedure provides instructions for removing

and replacing the key pad PCB.

1. Remove the front panel assembly as directed

in section 10.

2. Place the front panel assembly face down on

a protected work surface.

3. Remove the 14 Phillips screws that attach

the backing plate to the front panel assem-

bly.

4. Release the LCD display cable from the re-

taining clip on the front panel backing plate

(Figure 13).

5. Remove the front panel backing plate, care-

fully feeding the LCD cable through the ac-

cess hole to avoid damage to the cable or con-

nector.

6. Remove the rubber cushion pad from the key

pad PCB and remove the PCB.

7. Reverse the above steps to install the re-

placement assembly.

MS2711 HHSA MM 9

FRONT PANEL

BACKING PLATE LCD CABLE

RETAINING CLIP

Figure 13. Front Panel Backing Plate

KEYPAD PCB

Figure 14. Front Panel Keypad PCB Location

13. KEY PAD MEMBRANE REPLACEMENT

This procedure provides instructions for replacing

the key pad membrane.

1. Remove the front panel assembly as directed

in section 10.

2. Remove the key pad PCB as directed in sec-

tion 12.

3. Remove the keypad membrane by gently

pulling the membrane up and out of the

holes in the front panel.

4. Reverse the above steps to install the re-

placement membrane.

14. MAIN PCB ASSEMBLY REPLACEMENT

This procedure provides instructions for replacing

the main PCB assembly with the connector panel at-

tached. The assembly consist of two PCBs (Control

and RF) which must be replaced together.

1. Remove the front panel assembly as directed

in section 10.

2. Disconnect the battery connector from J13 on

the main PCB.

3. Disconnect the semi-rigid coaxial cable from

the RF connector on the connector panel.

4. Remove the three PCB mounting screws and

remove the Control PCB assembly with the

connector panel attached.

5. Remove the three .25” standoffs and four

Phillips screws and remove the RF PCB.

6. Reverse the above steps to install the new

main PCB.

NOTE

The main PCB connector panel fits into

grooves in the two halves of the Spectrum

Analyzer case. Make sure the panel is cor-

rectly aligned with the grooves before reas-

sembling the two halves together.

10 MS2711 HHSA MM

KEYPAD MEMBRANE

Figure 15. Front Panel Keypad Membrane

PCB MOUNTING

SCREWS (3)

BATTERY

CONNECTOR

Figure 16. Control PCB

CONNECTOR P2 TO RF IN CONNECTOR

Figure 17. RF PCB

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