Anritsu MS2711B Manual de usuario

MS2711B

Hand Held

Spectrum Analyzer

MAINTENANCE MANUAL

Hand-Held Spectrum Analyzer

for Measuring, Monitoring and Analyzing

Signal Environments

P/N: 10580-00072

REVISION A

PRINTED: MAY 2002

490 JARVIS DRIVE ·MORGAN HILL, CA 95037-2809

Table of Contents

1. INTRODUCTION .......................................1

2. IDENTIFICATION NUMBER ................................1

3. DESCRIPTION ........................................1

4. OPTIONS ...........................................1

5. PERFORMANCE VERIFICATION PROCEDURES ....................2

5.1. Frequency Accuracy ..................................2

5.2. Internal Reference Frequency Adjustment ......................2

5.3. Phase Noise Verification ................................3

5.4. Second Harmonic Distortion Test ...........................4

5.5. Residual Spurious Response Test ...........................5

5.6. Resolution Bandwidth Accuracy Test .........................6

5.7. Level Accuracy Test ..................................8

5.8. Displayed Average Noise Level ............................9

5.9. Dynamic Range Test .................................10

5.10. Power Monitor (Option 5) Verification ........................11

5.11. Preamplifier (Option 8) Verification .........................12

5.11.1. Displayed Average Noise Level .......................12

5.11.2. Level Accuracy Test .............................13

5.12. Tracking Generator (Option 20) Verification.....................16

5.12.1. Output Level Accuracy Test .........................16

5.12.2. Tracking Generator Harmonics And Spurious Test.............17

5.12.3. Frequency Offset Tracking Test .......................19

6. STATIC SENSITIVE ASSEMBLY HANDLING ......................20

7. BATTERY PACK REMOVAL AND REPLACEMENT ...................21

8. BATTERY INFORMATION .................................22

8.1. Battery Testing Procedure ..............................22

9. FRONT PANEL ASSEMBLY REMOVAL AND REPLACEMENT.............23

10. LCD ASSEMBLY REPLACEMENT ............................24

11. KEY PAD PCB REPLACEMENT ..............................24

12. KEY PAD MEMBRANE REPLACEMENT .........................25

13. PCB ASSEMBLY REPLACEMENT.............................25

14. REPLACEABLE PARTS...................................27

MS2711B HHSA MM i/ii

1. INTRODUCTION

This manual provides maintenance instructions for

the MS2711B Spectrum Analyzer. It describes the

product and provides performance verification proce-

dures, parts replacement procedures, and a replace-

able parts list.

2. IDENTIFICATION NUMBER

All Anritsu instruments are assigned a six-digit se-

rial number, such as "101001." This number appears

on a decal affixed to the back panel of the instru-

ment. Please use this identification number during

any correspondence with Anritsu Service Centers

about this instrument.

3. DESCRIPTION

The MS2711B Spectrum Analyzer is a synthe-

sizer-based hand held spectrum analyzer that pro-

vides 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 1.

4. OPTIONS

The following options are available for the MS2711B:

·Option5—RFWattmeter Power Monitor (RF

detector not included)

·Option 8 ¾Built-in 20 dB Preamplifier, 1 MHz

to 3 GHz

·Option 20 ¾Built-in Tracking Generator, 10

MHz to 3 GHz

NOTE

Options 5 and 8 are mutually exclusive; that

is, they cannot both be installed in the same

instrument at the same time.

MS2711B HHSA MM 1

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 1. MS2711B Spectrum Analyzer Block Diagram

5. PERFORMANCE VERIFICATION

PROCEDURES

The following procedures can be used to verify the

performance of the MS2711B Spectrum Analyzer

having firmware version 2.09 or later.

5.1. Frequency Accuracy

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

quency accuracy of the Spectrum Analyzer.

a. Equipment Required:

·Anritsu MG3692A Synthesized Signal

Source with option 15A, or equivalent

·Anritsu 34RSN50 50 ohm adapter or

equivalent

·Anritsu 15NNF50-1.5C RF Coaxial Cable

or equivalent

·10 MHz Reference Standard

·BNC male to BNC male coaxial cable

b. Procedure:

1. Connect the 10 MHz reference source to

the Anritsu MG3692A Synthesized Signal

Source.

2. Connect the output of the source to the

MS2711B RF Input.

3. Connect the external power supply

(Anritsu part number 40-115) to the

MS2711B.

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 MG3692A Synthesized Signal

Source.

6. Set the MG3692A output to 2000 MHz,

CW with an RF output level of 0 dBm.

NOTE

Before continuing, allow a 30-minute warm up

for the internal circuitry to stabilize.

7. On the MS2711B, 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 2000 and press the ENTER key to

set the center frequency to 2000 MHz.

11. Press the SPAN soft key and enter 50.

Press the kHz soft key to set the span to

50 kHz.

12. Press the BW/SWEEP key.

13. Press the RBW soft key and then the MAN-

UAL soft key. Use the Up/down arrow key

to select 10 kHz. Press ENTER to set the

resolution bandwidth to 10 kHz and select

BACK.

14. Press the VBW soft key and then the MAN-

UAL soft key. 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 2000 MHz, ±4 kHz.

NOTE

If the unit fails the Frequency Accuracy test,

perform the Internal Reference Frequency Ad-

justment procedure in Section 5.2. If the units

still fails the Frequency Accuracy test after

the Internal Reference Frequency Adjustment

has been completed, replace the PCB assem-

bly.

5.2. Internal Reference Frequency Adjust-

ment

Use this procedure to adjust the frequency if the unit

fails the Spectrum Analyzer Frequency Accuracy

verification test in Section

a. Equipment Required:

·Anritsu MG3692A Synthesized Signal

Source, with options 2A, 4 and 15A, or

equivalent

·Anritsu 34RSN50 50 ohm adapter or

equivalent

·Anritsu 15NNF50-1.5C RF Coaxial Cable

or equivalent

·10 MHz Reference Standard

·BNC male to BNC male coaxial cable

2 MS2711B HHSA MM

b. Procedure:

1. Connect the 10 MHz reference source to

the Anritsu MG3692A Synthesized Signal

Source.

2. Connect the output of the source to the RF

Input of the Spectrum Analyzer.

3. Connect the external power supply

(Anritsu part number 40-115) to the Spec-

trum Analyzer.

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 MG3692A Synthesized Signal

Source.

6. Set the MG3692A output to 2000 MHz

with an RF output level of –30 dBm.

NOTE

Before continuing, allow a 30-minute warm up

for the internal circuitry to stabilize.

7. On the Spectrum Analyzer, press the

FREQ/SPAN key, then the CENTER soft key.

8. Enter 2000 and press the ENTER key to

set the center frequency to 2000 MHz.

9. Press the SPAN soft key, then enter 50

and press the kHz soft key to set the span

to 50 kHz.

10. Press the BW/SWEEP key, then press the

RBW soft key. Use the Up/Down Arrow

key to select 10 KHz, then press ENTER.

11. Turn off the Spectrum Analyzer, then

press and hold the 1, 5, and 9 keys and

press the ON/OFF key to enter Service

Mode.

12. Press the SYS key. Then, press the SER-

VICE soft key.

13. Press the SET TCXO soft key. Use the

Up/Down Arrow key to increase the

TCXO number, then press the ENTER key.

Observe if the response is closer to the

center of the display on spectrum ana-

lyzer.

14. Repeat the above step until the response

is centered on the display.

15. Turn the unit off, then back on to exit Ser-

vice Mode.

NOTE:

If increasing the TCXO number moves the re-

sponse further away from the center, decreas-

ing the TCXO number will move the response

in the opposite direction.

5.3. Phase Noise Verification

a. Equipment Required:

·Anritsu MG3692A Synthesized Signal

Source with options 2A, 4 and 15A, or

equivalent

·Anritsu 34RSN50 50 ohm adapter or

equivalent

·Anritsu 15NNF50-1.5C RF Coaxial Cable

or equivalent

b. Procedure:

1. Connect the output of the source to the

MS2711B RF Input.

2. Connect the external power supply

(Anritsu part number 40-115) to the

MS2711B.

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-minute warm up

for the internal circuitry to stabilize.

4. Set the MG3692A output to 1000 MHz,

CW with an RF output level of –30 dBm.

5. On the MS2711B, press the BW/SWEEP

key.

6. Press the RBW soft key and then the MAN-

UAL soft key. Use the Up/down arrow key

to select 10 kHz. Press ENTER to set the

resolution bandwidth to 10 kHz and se-

lect BACK.

7. Press the VBW soft key and then the MAN-

UAL soft key. Use the Up/down arrow key

to select 3 kHz. Press ENTER to set the

video bandwidth to 3 kHz.

8. On the MS2711B, press the FREQ/SPAN

key and the CENTER soft key.

9. Enter 1000 and press the MHz soft key to

set the center frequency to 1000 MHz.

MS2711B HHSA MM 3

10. Press the SPAN soft key and enter 0.1.

Press the MHz soft 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 the ENTER key to set the refer-

ence level to –27 dBm.

13. Press the MARKER key, then the M1 soft

key.

14. Press EDIT and enter 1000. Press the MHz

soft key 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 1000.03. Press MHz

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 SINGLE/CONT key and read and

record the D2 reading.

19. Press the SINGLE/CONT key to read and

record five values, then calculate the av-

erage of the five recorded values.

20. Subtract 40 dB from the average value

and verify that the result is £–75 dBc/Hz.

(For example: –35 dBc measured –

40 dB = –75 dBc/Hz.)

NOTE

The measured value is converted to dBc/Hz us-

ing the following formula: ()

[]

dBc Hz measureddBc RBW

/log

=- - 10 1

At 10 kHz RBW, ()

10 40

log RBW

Hz =,so

dBc Hz measureddBc/=- - 40.

21. Press the BACK soft key and the M3 soft

key.

22. Press the EDIT key and enter 999.970.

Press MHz to set the M3 marker frequency

to 999.970 MHz (30 kHz lower than the

center frequency).

23. Press the DELTA (M3-M1) soft key.

24. Press the SINGLE/CONT key. Read and re-

cord the D3 reading.

25. Press the SINGLE/CONT key to read and

record five values, then calculate the av-

erage of the five recorded values.

Subtract 40 dB from the average value and

verify that the result is £–75 dBc/Hz. (For ex-

ample: –35 dBc measured – 40 dB = –75

dBc/Hz.)

5.4. Second Harmonic Distortion Test

The following test can be used to verify the input re-

lated spurious response of the Spectrum Analyzer.

a. Equipment Required:

·Anritsu MG3692A Synthesized Signal

Source with options 2A, 4 and 15A, or

equivalent

·Anritsu 34RSN50 50 ohm adapter or

equivalent

·Anritsu 15NNF50-1.5C RF Coaxial Cable

or equivalent

·10 MHz Reference Standard

·50 MHz Low Pass Filter (Anritsu part

number 1030-96)

·BNC male to BNC male coaxial cable

b. Procedure:

1. Connect the 10 MHz reference source to

the Anritsu MG3692A Synthesized Signal

Source.

2. Connect one end of the 50 MHz Low Pass

Filter to the output of the source and the

other end to the Spectrum Analyzer RF

Input with the RF coaxial cable.

3. Connect the external power supply

(Anritsu part number 40-115) to the Site

Master.

4. On the MS2711B, press and hold the ES-

CAPE/CLEAR key, then press the ON/OFF

key to turn on the Spectrum Analyzer.

(This sets the instrument to the factory

preset state.)

5. Turn on the 10 MHz reference source and

the Anritsu MG3692A Synthesized Signal

Source.

6. Set the MG3692A output to 40 MHz CW,

with an RF output level of –30 dBm.

NOTE

Before continuing, allow a 30-minute warm up

for the internal circuitry to stabilize.

7. On the Spectrum Analyzer, press the AM-

PLITUDE key and the REF LEVEL soft key.

4 MS2711B HHSA MM

8. Enter –27 and press the ENTER key to set

the Reference Level to –27 dBm.

9. Press the SCALE soft key and enter 7then

press ENTER.

10. Press the FREQ/SPAN key and then the

CENTER soft key.

11. Enter 40 and press the MHz soft key to set

the center frequency to 40 MHz.

12. Press the SPAN soft key and enter 0.2.

Press the MHz soft key to set the span to

0.200 MHz.

13. Press the BW/SWEEP key.

14. Press the RBW soft key and then the MAN-

UAL soft key. Use the Up/down arrow key

to select 10 kHz. Press ENTER to set the

resolution bandwidth to 10 kHz and select

BACK.

15. Press the VBW soft key and then the MAN-

UAL soft key. Use the Up/down arrow key

to select 3 kHz. Press ENTER to set the

video bandwidth to 3 kHz.

16. Press the MARKER key, then the M1 soft

key.

17. Select the EDIT soft key, then enter 40.

Press the MHz soft key to set M1 to 40

MHz .

18. On the MG3692A Synthesized Signal

Source, adjust the output level so that the

M1 reading of Spectrum Analyzer is –30

dBm at 40 MHz.

19. On the Spectrum Analyzer, press the

FREQ/SPAN key and then the CENTER soft

key.

20. Enter 80 and press the MHz soft key to set

the center frequency to 80 MHz.

21. Press the MARKER key and the M1 soft

key.

22. Select the EDIT soft key, then enter 80.

Press the MHz soft key to set M1 to 80

MHz .

23. Record the amplitude of the signal at M1

80 MHz:

Second Harmonic Level @ 80 MHz =____dBm

24. Convert this measured value to dBc using

the following formula:

Input Related Spurious Response (dBc) =

[Second Harmonic Level @ 80 MHz] +

30 dBm = ___ dBc

Specifications for this measurement are –45

dBc with –30 dBm into the first mixer.

5.5. Residual Spurious Response Test

The following test can be used to verify the residual

spurious response of the Spectrum Analyzer.

a. Equipment Required:

·Anritsu 28N50-2 or SM/PL 50 ohm Ter-

mination or equivalent

b. Procedure:

1. Connect the 50 ohm termination to the

Spectrum Analyzer RF Input.

2. On the Spectrum Analyzer, press and

hold the ESCAPE/CLEAR key, then press

the ON/OFF key to turn on the Spectrum

Analyzer. (This sets the instrument to the

factory preset state.)

NOTE

Before continuing, allow a 30-minute warm up

for the internal circuitry to stabilize.

3. On the Spectrum Analyzer, press the AM-

PLITUDE key and the REF LEVEL soft key.

4. Enter –75 and press the ENTER key to set

the Reference Level to –75 dBm.

5. Press the SCALE soft key and enter 5,

then press ENTER.

6. Press the BW/SWEEP key.

7. Press the RBW soft key and then the MAN-

UAL soft key. Use the Up/down arrow key

to select 10 kHz. Press ENTER to set the

resolution bandwidth to 10 kHz and se-

lect BACK.

8. Press the VBW soft key and then the MAN-

UAL soft key. Use the Up/down arrow key

to select 100 Hz and press ENTER to set

the video bandwidth to 100 Hz.

9. Press the FREQ/SPAN key and the START

soft key.

10. Enter 500 and press the kHz soft key to set

the start frequency to 500 kHz.

11. Press the STOP soft key and enter 4, then

press the MHz soft key to set the stop fre-

quency to 4 MHz.

12. Wait until one full sweep is complete.

13. Press the MARKER key and then the M1

soft key.

MS2711B HHSA MM 5

14. Press the ON/OFF soft key and then the

MARKER TO PEAK soft key.

15. Record the M1 amplitude reading and

verify whether it is less than or equal to

–90 dBm.

NOTE

If a spur with an amplitude larger than –90

dBm occurs, wait another full sweep and ob-

serve whether the spur occurs at the same

point on the second sweep. If the spur does not

occur at the same point on the second sweep,

then the spur on the first sweep was not real.

16. Press the BW/SWEEP key.

17. Press the VBW soft key and then the MAN-

UAL soft key. Use the Up/down arrow key

to select 3 kHz and press ENTER to set the

video bandwidth to 3 kHz.

18. Press the FREQ/SPAN key and the START

soft key.

19. Enter 4and press the MHz soft key to set

the start frequency to 4 MHz.

20. Press the STOP soft key and enter 1000,

then press the MHz soft key to set the stop

frequency to 1000 MHz.

21. Wait until one full sweep is complete.

22. Press the MARKER key and then the M1

soft key.

23. Press the ON/OFF soft key and then the

MARKER TO PEAK soft key.

24. Record the M1 amplitude reading and

verify it is £–90 dBm.

25. Press the FREQ/SPAN key and the START

soft key.

26. Enter 1000 and press the MHz soft key to

set the start frequency to 1000 MHz.

27. Press the STOP soft key and enter 2000,

then press MHz soft key to set the stop fre-

quency to 2000 MHz..

28. Wait until one full sweep is complete.

29. Press the MARKER key and then the M1

soft key.

30. Press the ON/OFF soft key and then the

MARKER TO PEAK soft key.

31. Record the M1 amplitude reading and

verify it is £–90 dBm.

32. Press the FREQ/SPAN key and the START

soft key.

33. Enter 2000 and press the MHz soft key to

set the start frequency to 2000 MHz.

34. Press the STOP soft key and enter 3000,

then press the MHz soft key to set the stop

frequency to 3000 MHz.

35. Wait until one full sweep is complete.

36. Press the MARKER key and then the M1

soft key.

37. Press the ON/OFF soft key and then the

MARKER TO PEAK soft key.

38. Record the M1 amplitude reading and

verify it is £–90 dBm.

5.6. Resolution Bandwidth Accuracy Test

The following test can be used to verify the resolu-

tion bandwidth accuracy of the Site Master Spec-

trum Analyzer at four frequencies.

a. Equipment Required:

·Anritsu MG3692A Synthesized Signal

Source with options 2A, 4 and 15, or

equivalent

·Anritsu 34RSN50 50 ohm adapter or

equivalent

·Anritsu 15NNF50-1.5C RF Coaxial Cable

or equivalent

·10 MHz Reference Standard

·BNC male to BNC male coaxial cable

b. Procedure:

1. Connect the 10 MHz reference source to

the Anritsu MG3692A Synthesized Signal

Source.

2. Connect the output of the Anritsu

MG3692A Synthesized Signal Source to

the Spectrum Analyzer RF Input.

3. On the Spectrum Analyzer, press and

hold the ESCAPE/CLEAR key, then press

the ON/OFF key to turn on the Spectrum

Analyzer. (This sets the instrument to the

factory preset state.)

NOTE

Before continuing, allow a 30-minute warm up

for the internal circuitry to stabilize.

4. Set the MG3692A output to 1 GHz, with

an RF output level of –30 dBm.

5. On the Spectrum Analyzer, press the AM-

PLITUDE key and the REF LEVEL soft key.

6 MS2711B HHSA MM

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