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Using the MA24104A 5-4 Uncertainty of a Measurement
PowerXpert UG PN: 10585-00020 Rev. C 5-9
Uncertainty Examples
Two measurement uncertainty calculations for Low Aperture Time mode are shown for the MA24104A in
Table 5-3. The MA24104A is used to measure the power of a 1 GHz, +50.0 dBm and +10 dBm CW signal from a
signal source with a 1.5:1 VSWR and a load having a 1.2:1 VSWR. The example is based on 128 measurement
averages.
Table 5-3. Measurement Uncertainty Examples
Uncertainty Term
Uncertainty
at +50 dBm
(%)
Uncertainty
at +10 dBm
(%)
Probability
Distribution Divisor
Adjusted
Uncertainty
at +50 dBm
(%)
Adjusted
Uncertainty
at +10 dBm
(%)
Measurement
Uncertainty
3.8 3.8
Normal at 2
21.91.9
Noise
0.0 1.0
Normal at 2
20.00.5
Zero Set 0.1 4.0 Rectangular 0.0 2.3
Zero Drift
0.0 1.2
Normal at 2
20.00.7
Directivity Induced
Uncertainty
0.6 0.6 Rectangular 0.3 0.3
Source Mismatch
Uncertainty
1.4 1.4 Rectangular 0.8 0.8
Load Mismatch
Uncertainty
3.7 3.7 Rectangular 2.1 2.1
Effect of Digital
Modulation
0 0 Rectangular 00
Combined Uncertainty
(RSS)
Room Temperature
3.0 3.9
Expanded Uncertainty
with K=2
Room Temperature
6.0 7.7
Temperature
Compensation
1.4 1.4 Rectangular 0.8 0.8
Combined Uncertainty
(RSS, 0 to 50 °C)
3.1 3.9
Expanded Uncertainty
with K=2
(RSS, 0 to 50 °C)
6.2 7.9
Table 5-4. Noise Measurement Uncertainty Calculations
Noise Calculations at 50 dBm (100 W):
Noise 24 mW/100 W = 0.0 %
Zero Set 68 mW/100 W = 0.1 %
Zero Drift 20 mW/100 W = 0.0 %
Noise Calculations at +10 dBm (10 mW):
Noise 100 W/10 mW = 1.0 %
Zero Set 398 W/10 mW = 4.0 %
Zero Drift 119 W/10 mW = 1.2 %
- Anritsu PowerXpert 1
- USB Power Sensors 1
- SOFTWARE PRODUCT LICENSE 4
- MA24104A: 5
- Notes On Export Management 12
- CE Conformity Marking 12
- C-tick Conformity Marking 12
- Safety Symbols 13
- Symbols Used in Manuals 13
- For Safety 14
- Table of Contents 15
- Table of Contents (Continued) 16
- 1-1 Scope of Manual 21
- 1-2 Introduction 21
- 1-3 Description 21
- 1-4 CD-ROM Contents 21
- 1-5 Initial Inspection 22
- 1-6 Sensor Identification 23
- 1-8 Contacting Anritsu 24
- 2-1 Introduction 25
- Installing PowerXpert 26
- Chapter 3 — Using PowerXpert 33
- 3-2 PowerXpert Settings 34
- 3-3 PowerXpert 36
- Overview 36
- MA24105A GUI 37
- Numerical Display Area 38
- Sensor Information Area 38
- 3-4 Continuous Mode 42
- Forward Measurement 43
- Reverse Measurement 43
- Video Bandwidth 43
- Aperture Time 43
- 3-5 Time Slot Mode 44
- 3-6 Scope Mode 45
- Data Points 46
- Data Points > 100 47
- Data Points ≤ 100 47
- Gate and Fence 48
- 3-7 General Settings 49
- Auto Average 50
- Auto Averaging Source 50
- Averaging Method 50
- Averages 51
- Apply Above Settings Button 51
- 3-8 Trigger Settings 52
- Trigger Level 53
- Trigger Edge 53
- Noise Immunity 54
- Arm Trigger Button 54
- 3-9 Tools 55
- Log Data 56
- Multiple Sensor Display 57
- View Summary 58
- Offset Table 59
- Updating the Firmware 59
- 3-10 Settings 60
- Secure Mode 62
- 3-11 Help 63
- 3-11 Help Using PowerXpert 64
- Chapter 4 — Power Sensor Care 65
- 4-3 RF Connector Precautions 66
- 4-4 Connection Techniques 67
- Visual Inspection 68
- Pin Depth Measurement 68
- Pin Depth Dimensions 69
- Pin Depth Gauge 70
- Pin Depth Tolerances 70
- 4-6 Connector Cleaning 71
- ISOPROPYL 72
- INDUSTRIAL 72
- SOLVENTS 72
- 5-1 Sensor Overview 73
- 5-2 Making Measurements 73
- Basic Power Measurement 74
- Connecting the Sensor 75
- MA24104A Maximum Power 79
- 5-5 Error States 82
- MA24104A 83
- 6-4 VSWR Pretest 85
- 6-5 Directivity Test 86
- 6-6 Frequency Response Test 88
- 6-7 Linearity Test 90
- 7-1 Sensor Overview 95
- 7-2 Making Measurements 96
- Multitone Signals 100
- Noise and Averaging 100
- Settling Time 100
- Maximum Power 100
- Frequency [MHz] 101
- RF power [W] 101
- MA24105A Maximum Power 101
- Uncertainty Examples 103
- 7-5 Error States 104
- MA24105A 105
- 8-4 VSWR Pretest 107
- Test Procedure 107
- 8-5 Directivity Test 108
- “Power Forward” 109
- “Power Reverse” 109
- 8-6 Frequency Response Test 111
- 8-7 Linearity Test 113
- 9-1 Sensor Overview 119
- 9-2 Making Measurements 119
- Connecting the DUT 120
- Zeroing the Sensor 121
- Calibrating the Sensor 121
- Optimizing the Readings 121
- Time Varying Signals 123
- Uncertainty Example 126
- 20.00.4 126
- 20.00.6 126
- 20.70.7 126
- 9-5 Error States 127
- MA24106A 129
- 10-4 VSWR Pretest 131
- 10-5 Frequency Response Test 132
- 10-6 Linearity Test 134
- MA24118A, and MA24126A 141
- 0.20 dB 144
- 0.15 dB 144
- 0.10 dB 144
- 0.05 dB 144
- 0.01 dB 144
- Noise Floor in Scope Mode 147
- Uncertainty Components 148
- 20.00.8 149
- 20.80.8 149
- 2 1.25 1.25 150
- 11-5 Error States 151
- 12-1 Introduction 153
- 12-2 Precautions 153
- 12-4 VSWR Pretest 155
- 12-5 Frequency Response Test 156
- 12-6 Linearity Test 159
- MA24108A 160
- MA24118A 160
- MA24126A 160
- Chapter 13 — Remote Operation 171
- Time Resolution 172
- Sampling Rate 172
- Error Responses 172
- Default Sensor Settings 172
- 13-3 General Purpose Commands 174
- AUTOAVG? 183
- AUTOAVGSRC 183
- AUTOAVGSRC? 184
- AUTOAVGRES 184
- AUTOAVGRES? 184
- FORWARD? 185
- REVERSE? 185
- VIDEOBW? 186
- MODTYPE? 186
- CCDFTHRESH 186
- CCDFTHRESH? 187
- 13-4 Mode Commands 188
- CHAPERT? 189
- Slot Mode 189
- TSLTPARAMS 190
- TSLTPARAMS? 190
- Scope Mode 191
- SCOPEPARAMS 192
- SCOPEPARAMS? 192
- GATEPARAMS 192
- GATEPARAMS? 193
- GENABLE? 193
- GATEVALUES? 193
- 13-5 Trigger Commands 194
- Trigger Delay 197
- Trigger Noise Immunity 198
- TRGNOISE 198
- TRGNOISE? 198
- Trigger Arming 199
- TRGARMTYP 199
- TRGARMTYP? 200
- A-1 Demo Application 201
- B-1 Introduction 205
- Removing Old Upgrade Driver 211
- C-1 Introduction 213
- Alphabetical Index of 221
- Programming Commands 221
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