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ML248 A Series
Anritsu ML248 A Series Maintenance Manual
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Maintenance Manual
ML2480B Series, ML2490A Series
Wideband/Pulse Power Meter
ML2487A/B
Wideband Power Meter - Single Channel
ML2488A/B
Wideband Power Meter
- Dual Channel
ML2495A
Pulse Power Meter
- Single Channel
ML2496A
Pulse Power Meter - Dual Channel
Anritsu Comp
any
490 Jarvis Drive
Morgan Hill, CA 95037-2809
USA
Part Number: 13000
-00164
Revision: K
Published: February 2015
Copyright 201
1 Anritsu Comp
any
2
Table of Contents
Default Chapter
5
Table of Contents
5
Chapter 1-General Information
11
Introduction
11
Description
11
Documentation Conventions
11
Instrument Identification
11
Hard Keys or Front Panel Keys
11
User Interface, Menus, and Soft Buttons
12
User Interface Navigation Conventions
12
Identification Number
12
Online Manual
12
Related Manuals
12
Model Options and Accessories
13
Ml248Xa
13
Ml248Xb
13
Ml249Xa
14
Service Policy
14
Replaceable Parts
15
1-10 Test Equipment List
16
ESD Requirements
17
Chapter 2-Functional Description
19
Product Overview
19
Sensor Inputs and Amplifiers
19
Sensors
19
Internal Standard 50 Mhz Reference (Ml248Xx Only)
19
Option 15 Internal 50 Mhz and 1 Ghz Reference
19
Measurement Modes
19
General Operation
20
Input Amplifier
20
Signal Processing
20
Fpga
20
Digital Signal Processor (DSP)
20
Interface
20
GPIB Operation
20
Case Construction
20
Front Panel
21
Rear Panel
21
Handle and Rack Mount
21
Internal Construction
21
Measurement PCB
21
Control PCB
21
Power Supply
21
LCD Display
21
System Keys
21
Soft Keys
21
Data Entry Keypad
22
On/Standby Key
22
Front Panel Connectors
22
Sensor Inputs
22
RF Reference Calibrator
22
Rear Panel Connectors
22
Line Power Input
22
Ground Stud
22
RS-232 Port
22
Gpib
23
BNC I/O Ports
23
VGA out
23
Ethernet - 10/100 Base T LAN Interface
23
2-10 Power Supply Operation
23
Chapter 3-Performance Verification
25
Introduction
25
Test Conditions
25
Measurement Uncertainty
25
Input Range Verification
25
Required Equipment
25
Measurement Procedure
25
Range Data Interpretation
27
Pass/Fail Criteria
28
Absolute Error
28
Linearity
28
Range Change
28
50 Mhz Calibrator Frequency (All Models)
29
Required Equipment
29
Procedure
29
Calibrator Frequency Uncertainty
29
Ghz Calibrator Frequency (Ml248Xx-Option 15, Ml249Xa)
31
Required Equipment
31
Procedure for 1 Ghz Verification
31
Calibrator Frequency Uncertainty
31
50 Mhz Calibrator Power Level (All Models)
32
Required Equipment
32
Recording Results
32
Procedure
32
P Meas Calculation
35
Calibrator Power Level Uncertainty
36
Ghz Calibrator Power Level (Ml248Xx-Option 15, Ml249Xa)
38
50 Mhz Calibrator VSWR Verification (All Models)
38
Required Equipment
38
Recording Results
38
Procedure
38
3-10 1 Ghz Calibrator VSWR Verification
43
(Ml248Xx-Option 15, Ml249Xa)
43
Recording Results
43
Procedure
43
Chapter 4-Adjustment
49
Introduction
49
Required Test Equipment
49
Test Conditions
49
Pre-Test Setup
49
DC Reference Calibration
50
RF Calibrator 50 Mhz Frequency (Ml248Xx Without Option 15)
52
RF Calibrator Output Power (Ml248Xx Without Option 15)
52
RF Calibrator 50 Mhz Frequency and 50 Mhz/1 Ghz Output Power
52
Required Equipment
52
Preliminary Steps
52
Setting up the 50 Mhz Frequency
54
Setting up the 50 Mhz and 1 Ghz Levels
54
Verifying Cal Data was Saved
55
Chapter 5-Troubleshooting
57
Introduction
57
Front Panel and Display
57
Fault: no Display
57
Fault: Keys Inoperable: Display on
57
Fault: One or more Keys Inoperable: Display on and Operating
57
Fault: Measurement Problems with Input a or Input B
58
Fault: RF Calibrator
58
Rear Panel
58
Fault: Power Meter will Not Load Firmware
58
Fault: no GPIB Communication
59
Fault: Incorrect Operation of BNC Inputs or Outputs
59
General Faults
59
Fault: Power Meter Loses Non-Volatile Memory
59
Fault: Alarm Buzzer Does Not Sound
59
Chapter 6-Removal And Replacement Procedures
61
Introduction
61
Power Meter Disassembly
61
Tools Required
61
Measurement PCB Removal (ML2487/8A)
61
1Ghz Calibrator PCB Removal
63
Measurement PCB Removal (Ml248Xb and Ml249Xa)
64
Main Control PCB Removal
65
Front Panel Removal
67
Rear Panel Removal
68
PSU Assembly Removal
69
Power Meter Reassembly
70
Chapter 7-Firmware Updates
71
Introduction
71
Code Loader Program
71
Program Installation
71
Running the Program
71
Bootload Mode
72
Serial Interface Cable
73
Appendix A-Test Records
75
Introduction
75
Measurement Uncertainty
75
Test Records
75
Section 3-4: Input Range Verification
76
Measurements and Calculated Error Figure
76
Error, Linearity and Range Change Calculations
77
Section 3-5: 50 Mhz Calibrator Frequency Verification (All Models
78
Calibrator Frequency Uncertainty
78
Section 3-6: 1 Ghz Calibrator Frequency Verification (Ml248Xx-Option 15, Ml249Xa
79
Calibrator Frequency Uncertainty
79
Section 3-7: 50 Mhz Calibrator Power Level Verification (All Models
80
Pmeas Calculation
80
Calibrator Power Level Uncertainty
81
Uncertainty Results: Ml24Xxx Reference Calibrator Output Power Level
82
Expanded Uncertainty, P Actual Lower, P Actual Upper
82
Section 3-8: 1 Ghz Calibrator Power Level Verification (Ml248Xx-Option 15, Ml249Xa
83
Pmeas Calculation
83
Calibrator Power Level Uncertainty
84
Uncertainty Results: Ml24Xxx Reference Calibrator Output Power Level
85
Expanded Uncertainty, P Actual Lower, P Actual Upper
85
Section 3-9:50 Mhz Calibrator VSWR Verification (All Models
85
Section 3-10:1 Ghz Calibrator VSWR Verification (Ml248Xx with Opt. 15 and Ml249Xa
85
Section 4-5: DC Reference Calibration
86
Section 4-6: RF Calibrator 50 Mhz Frequency Adjustment
86
(Ml248Xx Without Option 15
86
Section 4-7: RF Calibrator Output Power Adjustment
86
Appendix B-Specifications
87
ML2487/8A, ML2487/8B and ML2495/6A Technical Data Sheet
87
Appendix C-Connector Care
89
Introduction
89
Connector Do's and Don'ts
89
Coaxial Connector Care
89
Visual Inspection
90
Connector Pin Depth Precautions
90
Pin Depth Dimensions
91
Pin Depth Gauge
91
Pin Depth Tolerances
92
Over Torquing Connectors
92
Teflon Tuning Washers
93
Mechanical Shock
93
Connector Cleaning Instructions
93
Cleaning Items Required
93
Important Cleaning Tips
93
Cleaning Procedure
94
Connection and Disconnection Techniques
95
Connection Procedure
95
Disconnection Procedure
95
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Anritsu ML248 A Series Specifications
General
Brand
Anritsu
Model
ML248 A Series
Category
Measuring Instruments
Language
English
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