Anritsu MS2711 User manual

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
PRINT
MODE
FREQ/SPAN
AMPLITUDE BW/SWEEP
SYS
ENTER
CLEAR
ESCAPE
ON
OFF
/
12
4
56
78
90
3
+-
.
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
COPYRIGHT 1999 ANRITSU CO.
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
N
N
HI-BAND
LO-BAND
IF AMP LOG
CPU
RF
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
PRINT
MODE
FREQ/SPAN
AMPLITUDE BW/SWEEP
SYS
ENTER
CLEAR
ESCAPE
ON
OFF
/
12
4
56
78
90
3
+-
.
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