Anritsu Spectrum Master MS2721A User manual

Spectrum Master
Model MS2721A
Spectrum Analyzer
MAINTENANCE MANUAL
490 JARVIS DRIVE ·MORGAN HILL, CA 95037-2809 P/N: 10580-00105
REVISION D
PRINTED: JUNE 2006
COPYRIGHT ã2005-2006 ANRITSU CO.

Table of Contents
1. General ............................................1
1.1. Introduction .......................................1
1.2. Description .......................................1
1.3. Recommended Test Equipment .............................1
2. Performance Verification ...................................2
2.1. Spectrum Analyzer Frequency Accuracy ........................2
2.2. Spectrum Analyzer Internal Reference Frequency Adjustment .............3
2.3. Spectrum Analyzer Phase Noise Verification ......................5
2.4. Spectrum Analyzer Second Harmonic Distortion Test..................6
2.5. Spectrum Analyzer Residual Spurious Response Test ................8
2.6. Display Average Noise Level (DANL) .........................11
2.7. Input Related Spurious Signals ............................12
2.8. Spectrum Analyzer Resolution Bandwidth Accuracy Test ...............15
2.9. Spectrum Analyzer Measurement Accuracy Verification................17
3. Battery Pack Removal and Replacement ..........................24
4. Battery Information .....................................26
5. Real Time Clock Battery Replacement ...........................26
6. Opening the Spectrum Master Case ............................27
7. Main PCB Assembly Replacement .............................29
8. Spectrum Analyzer Module Assembly Replacement ....................30
9. LCD Assembly Replacement ................................31
10. LCD Backlight PCB Removal and Replacement ......................32
11. Keypad Membrane and PCB Replacement .........................33
12. Function Key Membrane and Switchpad Replacement ...................35
13. Accessories and Replaceable Parts ............................36
14. Appendix A: MS2721A Test Records ............................38
14.1. Spectrum Analyzer Frequency Accuracy Test .....................38
14.2. Spectrum Analyzer Phase Noise Verification .....................38
14.3. Spectrum Analyzer Second Harmonic Distortion Test .................38
14.4. Spectrum Analyzer Residual Spurious Response Test with Pre-Amp Off .......38
14.5. Spectrum Analyzer Residual Spurious Response Test with Pre-Amp On .......39
14.6. Spectrum Analyzer Display Average Noise Level (DANL) ...............39
14.7. Spectrum Analyzer Input Related Spurious (IRS) ...................39
14.8. Spectrum Analyzer Resolution Bandwidth Accuracy Test ...............40
14.9. (b) Spectrum Analyzer Level Accuracy Across Frequency Test Setting ........41
14.10. (c) Spectrum Analyzer Level Accuracy Across Frequency Test Setting .......41
14.11. (e)Spectrum Analyzer Level Accuracy Through Power Test Setting .........42
14.12. (f) Spectrum Analyzer Level Accuracy Through Power Test Setting .........42
15. Appendix B: MS2721A Case Replacement Instructions (Kit # ND64730) .........43
Spectrum Master MM i

1. General
1.1. Introduction
This manual provides maintenance instructions for the Spectrum Master Model MS2721A Spectrum Analyzer. It de-
scribes the product and provides performance verification procedures, parts replacement procedures, and a replaceable
parts list.
1.2. Description
The Spectrum Master MS2721A is a synthesizer-based handheld spectrum analyzer.
1.3. Recommended Test Equipment
The following test equipment is recommended for use in testing and maintaining the Spectrum Master.
Instrument Critical Specification Recommended Manufacturer/Model
Synthesizer Frequency: 2 to 20 GHz
with options 2A, 3, 4, 15A, and 22
Anritsu Model MG3692A
Power Meter Power Range: –70 to + 20 dBm Anritsu Dual Channel Model ML2438A
Power Sensor Frequency: 10 MHz to 18 GHz,
–67 to +20 dB
Anritsu Model MA2442A
Frequency Reference Frequency: 10 MHz Absolute Time Corp., Model 300
Low Pass Filter Frequency: 50 MHz Anritsu Model 1030-96
Fixed Attenuator 10 dB Attenuation Weinschel Model 1-10
Power Splitter Frequency: DC to 18 GHz Weinschel Model 1870A
Adapter Frequency: DC to 20 GHz WSMA(m)-N(f),
50 Ohm
Anritsu Model 34RSN50
50 Ohm Adapter Frequency: DC to 20 GHz K(m)-N(f),
50 Ohm
Anritsu Model 34RKNF50
50 Ohm Termination Frequency: DC to 18 GHz Anritsu Model 28N50-2
RF Coaxial Cable Frequency: DC to 6.0 GHz N(m)-N(f),
50 Ohm
Anritsu Model 15NNF50-1.5C
Coaxial Cable BNC Male to Male 60 Inch, 50 Ohm Pasternack Enterprises Model PE3067-60
Table 1. Recommended Test Equipment
Spectrum Master MM 1

2. Performance Verification
The following sections contain tests that can be used to verify the performance of the Spectrum Master Model
MS2721A.
2.1. Spectrum Analyzer Frequency Accuracy
The following test can be used to verify the CW frequency accuracy of the Spectrum Master.
a. Equipment Required:
·Anritsu MG3692A Synthesized Signal Source with options 2A, 3, 4, 15A, and 22, or equivalent
·10 MHz Reference Standard
·Anritsu 34RSN50 50 ohm adapter or equivalent
·Anritsu Spectrum Master External Power Supply (part number 40-168)
·Anritsu 15NNF50-1.5C RF Coaxial Cable or equivalent
·BNC male to BNC male coaxial cable
b. Procedure:
1. Connect the 10 MHz Reference Standard to the Anritsu MG3692A Synthesized Signal Source and to the Spec-
trum Master.
2. Connect the output of the MG3692A Synthesized Signal Source to the RF In connector of the Spectrum Master.
3. Connect the external power supply (Anritsu part number 40-168) to the Spectrum Master.
4. Press the ON/OFF key to turn on the Spectrum Master.
5. Press the Shift key, the Preset key (1), and then the Preset soft key to reset the instrument to the default starting
conditions.
6. Turn on the 10 MHz Reference Standard and the Anritsu MG3692A Synthesized Signal Source.
NOTE: Before continuing, allow a 30-minute warm up for the internal circuitry to stabilize.
7. Set the MG3692A output to 1 GHz CW, with an RF output level of –30 dBm.
8. Press the Amplitude key and select the Reference Level soft key.
9. Use the keypad to enter –10 and select the dBm soft key.
10. Press the Freq key and select the Center Freq soft key.
11. Use the keypad to enter 1 and select the GHz soft key.
12. Press the Span key, use the keypad to enter 10, and select the kHz soft key.
13. Press the BW key and select the RBW soft key.
14. Use the keypad to enter 100 and select the Hz soft key.
15. Press the VBW soft key and use the keypad to enter 30, then select the Hz soft key.
16. Press the Marker key, and select the Peak Search soft key.
17. Verify that the marker frequency is 1 GHz, ±1 kHz.
18. Repeat steps 7 through 15 for 7 GHz.
19. Verify that the marker frequency is 7 GHz, ±7 kHz.
NOTE: If the unit fails the Spectrum Analyzer Frequency Accuracy test, perform the Internal Reference
Frequency Adjustment procedure in Section 2.2 If the units still fails the Frequency Accuracy test after
the Internal Reference Frequency adjustment has been completed, replace the PCB assembly.
2 Spectrum Master MM

2.2. Spectrum Analyzer Internal Reference Frequency Adjustment
Use this procedure to adjust the frequency if the unit fails the Spectrum Analyzer Frequency Accuracy verification test
in Section 2.1.
a. Equipment Required:
·Anritsu MG3692A Synthesized Signal Source, with options 2A, 3, 4, 15A, and 22, or equivalent
·10 MHz Reference Standard
·Anritsu Spectrum Master External Power Supply (part number 40-168)
·Anritsu 34RSN50 50 Ohm adapter or equivalent
·Anritsu 15NNF50-1.5C RF Coaxial Cable or equivalent
·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 MG3692A Synthesized Signal Source to the RF In connector of the Spectrum Master.
3. Connect the external power supply (Anritsu part number 40-168) to the Spectrum Master.
4. Press the ON/OFF key to turn on the Spectrum Master.
5. Press the Shift key, the Preset key (1), and then the Preset soft key to reset the instrument to the default starting
conditions.
6. Turn on the 10 MHz reference source and the Anritsu MG3692A Synthesized Signal Source.
7. Set the MG3692A output to 7 GHz with an RF output level of –30 dBm.
NOTE: Before continuing, allow a 30-minute warm up for the internal circuitry to stabilize.
8. Press the Amplitude key and select the Reference Level soft key.
9. Use the keypad to enter –10 and select the dBm soft key.
10. Press the Atten Lvl soft key, use the keypad to enter 0 and press the dB soft key.
11. Press the Freq key and select the Center Freq soft key.
12. Use the keypad to enter 7 and select the GHz soft key.
13. Press the Span key, use the keypad to enter 10, and select the kHz soft key.
14. Press the BW key and select the RBW soft key.
15. Use the keypad to enter 100 and select the Hz soft key.
16. Press the VBW soft key and use the keypad to enter 30, then select the Hz soft key.
Spectrum Master MM 3

Press and hold the Shift key and press the 4,6, and 8(from top) soft keys together to enter into the Spectrum Master
Service Mode.
17. Press the Service Menu soft key, then the APP Service soft key.
18. Press the Calibration soft key, the 10 MHz TXCO soft key.
19. Use the Up/Down arrow key or the rotary knob to slowly adjust the displayed signal to the center of the display.
Allow the signal to stabilize between adjustments, and repeat as necessary.
20. Turn the Spectrum Master off, and then back on to exit Service Mode.
4 Spectrum Master MM
Soft Keys
4, 6, and 8
Shift Key
Figure 1. MS2721A Spectrum Master Service Mode Key Sequence

2.3. Spectrum Analyzer Phase Noise Verification
This test can be used to verify the phase noise of the Spectrum Master.
a. Equipment Required:
·Anritsu MG3692A Synthesized Signal Source, with options 2A, 3, 4, 15A, and 22, or equivalent
·Anritsu Spectrum Master External Power Supply (part number 40-168)
·10 MHz Reference Standard
·Anritsu 34RSN50 50 Ohm adapter or equivalent
·Anritsu 15NNF50-1.5C RF Coaxial Cable or equivalent
b. Procedure:
1. Connect the 10 MHz reference source to the Anritsu MG3692A Synthesized Signal Source.
2. Connect the output of the MG3692A Synthesized Signal Source to the RF In connector of the Spectrum Master.
3. Connect the external power supply (Anritsu part number 40-168) to the Spectrum Master.
4. Press the ON/OFF key to turn on the Spectrum Master.
5. Press the Shift key, the Preset key (1), and then the Preset soft key to reset to the default starting conditions.
6. Turn on the 10 MHz reference source and the Anritsu MG3692A Synthesized Signal Source.
7. Set the MG3692A output to 7.09 GHz CW, with an RF output level of +13 dBm.
NOTE: Before continuing, allow a 30-minute warm up for the internal circuitry to stabilize.
8. Press the Amplitude key and select the Reference Level soft key.
9. Use the keypad to enter 0 and select the dBm soft key.
10. Press the Atten Lvl soft key, use the keypad to enter 15 and press the dB soft key.
11. Press the Freq key and select the Center Freq soft key.
12. Use the keypad to enter 7.090050 and press the GHz soft key.
13. Press the Span key, use the keypad to enter 110, and select the kHz soft key.
14. Press the BW key and select the RBW soft key.
15. Use the keypad to enter 1 and select the kHz soft key.
16. Press the VBW soft key and use the keypad to enter 3, then select the Hz soft key.
17. Press the Shift key and then press the Trace (5) key.
18. Select the Trace A Operations soft key.
19. Press the # of Average soft key, use the keypad to enter 7, then press the Enter soft key.
20. Wait until the Trace Count displays 7/7.
21. Press the Marker key and select the Peak Search soft key
22. Press the Delta On/Off soft key to turn Delta on .
23. Use the keypad to enter 10 and press the kHz soft key, and record D1.
24. Subtract 30 dB from the average value and verify that the result is £–100 dBc/Hz.
(For example: –70 dBc measured – 30 dB = –100 dBc/Hz.)
Spectrum Master MM 5

NOTE: The measured value is converted to dBc/Hz using the following formula:
()
[]
dBc Hz measured dBc RBW
Hz
/log =- - 10 1
At 1 kHz RBW, ()
10 30
1
log
RBW
Hz =,sodBc Hz measured dBc/=- - 30.
25. Repeat steps 15 through 22 for 20 kHz, 30 kHz, and 100 kHz.
2.4. Spectrum Analyzer Second Harmonic Distortion Test
The following test can be used to verify the input related spurious response of the Spectrum Master.
a. Equipment Required:
·Anritsu MG3692A Synthesized Signal Source with options 2A, 3, 4, 15A, and 22, or equivalent
·10 MHz Reference Standard
·Anritsu Spectrum Master External Power Supply (Anritsu part number 40-168)
·Anritsu 34RSN50 50 Ohm adapter or equivalent
·Anritsu 15NNF50-1.5C RF Coaxial Cable or equivalent
·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
Master RF In with the coaxial cable.
3. Connect the external power supply (Anritsu part number 40-168) to the Spectrum Master.
4. Press the ON/OFF key to turn on the Spectrum Master.
5. Press the Shift key, the Preset key (1), and then the Preset soft key to reset the instrument to the default starting
conditions.
6. Turn on the 10 MHz reference source and the Anritsu MG3692A Synthesized Signal Source.
7. Set the MG3692A output to 50.1 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.
8. Press the Amplitude key and select the Reference Level soft key.
9. Use the keypad to enter –27 and press the dBm soft key.
10. Press the Atten Lvl soft key and enter 0, then press the dB soft key.
11. Press the Span key, use the keypad to enter 100, and select the kHz soft key.
12. Press the Shift key and then press the Sweep (3) key.
13. Press the Detection soft key, and then the Peak soft key.
14. Press the BW key and select the RBW soft key.
15. Use the keypad to enter 1 and select the kHz soft key.
16. Press the VBW soft key and use the keypad to enter 10, then select the Hz soft key.
17. Press the Freq key and select the Center Freq soft key.
18. Use the keypad to enter 50.0 and press the MHz soft key.
19. Press the Shift key and then press the Trace (5) key.
20. Select the Trace A Operations soft key.
6 Spectrum Master MM