Agilent-technologies N9340A Bedienungsanleitung Seite 60
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4 Making Measurements
58 N9340A User’s Guide
Third-Order Intermodulation Distortion
Two-tone, third- order intermodulation distortion is
a common test in communication systems. When
two signals are present in a non- linear system,
they may interact and create third- order
intermodulation distortion (TOI) products that are
located close to the original signals. These
distortion products are generated by system
components such as amplifiers and mixers.
This example tests a device for third- order
intermodulation using markers. Two sources are
used, one set to 300 MHz and the other to 301
MHz.
1 Connect the equipment as shown in figure below.
This combination of signal generators, low pass
filters, and directional coupler (used as a
combiner) results in a two- tone source with very
low intermodulation distortion.
Although the distortion from this setup may be
better than the specified performance of the
analyzer, it is useful for determining the TOI
performance of the source/analyzer combination.
After the performance of the source/analyzer
combination has been verified, the DUT (Device
Under Test, for example, an amplifier) would be
inserted between the directional coupler output
Freque nc y
Enter
7
MOD
On/Off
RF
4
1
0
2
9
6
3
On/Off
Am p l itude FM
Utility
LF Ou t
Pre set
Local
AM I/Q
File
Trigger
PulseM
·
Sweep
8
5
Remote
Standby
On
N9310 A RF Signal Generator 9 kH z - 3.0 G Hz
REVERSE PWR
4W MAX 30VDC
LF OUT RF OUT 50
FUN CTIONS
Fre qu enc y
Enter
7
MOD
On/Off
RF
4
1
0
2
9
6
3
On/Off
Am p litud e FM
Utility
LF Ou t
Pre set
Lo ca l
AM I/Q
File
TriggerPu l seM
·
Sweep
8
5
Rem o te
Standby
On
N9310 A RF Signal G ener a to r 9 k Hz - 3 .0 G H z
REVERSE PWR
4W MAX 30VDC
LF OUT RF OUT 50
FUN CTIONS
Signal generator
Signal generator
Directional
coupler
- User’s Guide 1
- 2
- 1 N9340A Overview 3
- 2Getting Started 3
- 3 System Setting 3
- 4Making Measurements 4
- 5Key Reference 5
- 7 Error Messages 8
- 8Menu Map 8
- N9340A Overview 9
- Introduction 10
- Enhanced Usability 11
- Front Panel Overview 12
- Top Panel Overview 13
- Display Annotations 14
- Step Notes 15
- Internal Charging 16
- Getting Started 17
- Power Requirements 19
- AC Power Cords 20
- Safety Considerations 21
- CAU-CAUTION 22
- Environmental Requirements 23
- Electrical Requirements 23
- Instrument Markings 24
- Power on your N9340A 25
- Preparation for Use 26
- Entering Data 28
- Viewing a Signal 29
- Some helpful tips 30
- Upgrading Firmware 31
- Adding an option 31
- Contact Agilent Technologies 32
- System Setting 33
- Visual and Audio Adjustment 34
- Ext Input 36
- Quick Saving State 37
- Recalling State 37
- Saving a file 38
- Deleting a file 39
- Loading a file 39
- Show System 40
- Show Error 41
- Factory Default Settings 44
- Making Measurements 45
- Measuring Multiple Signals 46
- Accuracy" on page 54 47
- Directional 48
- Signal generator 48
- Resolving Small Signals 50
- Hidden by Large Signals 50
- Measuring a Low-Level Signal 51
- Increased Sweep Time 54
- Trace Averaging 55
- Measuring Phase Noise 63
- Phrasenoise a RBWlog–= 63
- One Button Measurement 65
- Measuring ACPR 66
- Measuring Channel Power 67
- Channel Bandwidth 68
- Key Reference 69
- Amplitude 70
- Scale/DIV 71
- Scale Type 71
- Ref Offset 72
- Y Axis Units 72
- Avg Type 74
- In non-zero spans: 76
- In zero span: 76
- In FFT Mode 77
- Sweep Mode 77
- Single Sweep 78
- Frequency 81
- •Next LF Peak 85
- •Next RT Peak 85
- •Auto Search 85
- •To Center 86
- •Freq Count 86
- Marker Trace 87
- Last Span 89
- Clear Write 90
- Max Hold 90
- Minimum Hold 91
- Detector 91
- •Average 92
- •Pos Peak 92
- •Neg Peak 93
- Save Trace 94
- Recall Trace 94
- Limit Line 95
- Limit Pattern 95
- Set Pattern 95
- Limit Type 95
- Save Pattern 96
- Recall Pattern 96
- SCPI Command Reference 97
- SCPI Language Basics 98
- Basic Knowledge Requirement 99
- Command Categories 99
- Command Syntax 99
- Standard Notations 100
- Separator 101
- Common Commands 102
- CALCulate Subsystem 103
- Control Limit line Buzzer 104
- Control Limit Line Testing 104
- Set Limit Line Y-axis value 104
- Control Limit Pattern Testing 105
- Define Limit Pattern Values 106
- CALCulate:MARKer Subsection 107
- Marker Function 108
- Marker Mode 109
- Marker On/Off 110
- Marker to Trace 111
- Marker X Value 111
- Marker Read Y Value 112
- DEMOdulation Subsystem 113
- DISPlay Subsystem 114
- Trace Y-Axis Reference Level 115
- Vertical Axis Scaling 116
- Screen Color Style 116
- Display Mode 116
- Contrast 117
- Brightness 117
- INITiate Subsystem 118
- Take New Data Acquisitions 119
- Select One button measurement 120
- MEASure Subsystem 121
- Main channel 122
- Adjacent channel 122
- Channel space 122
- Main Channel Power 123
- Low Adjacent Channel Power 123
- Upper Adjacent Channel Power 123
- Channel Power Subsection 124
- Channel Power 125
- Power Density 125
- SENSe Subsystem 126
- Tur n Aver agin g On /Off 127
- Set the Average Count 127
- [:SENSe]:BANDwidth Subsection 128
- Video Bandwidth Automatic 129
- [:SENSe]:DETector Subsection 130
- [:SENSe]:FREQuency Subsection 131
- Center Frequency Step Size 132
- Frequency Span 132
- Full Frequency Span 133
- Zero Frequency Span 133
- Last Frequency Span 133
- Start Frequency 133
- Stop Frequency 134
- [:SENSe]:POWer Subsection 135
- [:SENSe]:SWEep Subsection 136
- SYSTem Subsystem 137
- TRACe Subsystem 138
- TRIGer Subsystem 139
- Video Trigger Level Amplitude 140
- UNIT Subsystem 141
- 6 SCPI Command Reference 142
- 140 N9340A User’s Guide 142
- Error Messages 143
- Error Message List 144
- Menu Map 149
- 8 Menu Map 150
- 148 N9340A User’s Guide 150
- Menu Map 8 151
- N9340A User’s Guide 149 151
- 150 N9340A User’s Guide 152
- N9340A User’s Guide 151 153
- 152 N9340A User’s Guide 154
- N9340A User’s Guide 153 155
- 154 N9340A User’s Guide 156
- N9340A User’s Guide 155 157
- 156 N9340A User’s Guide 158
- Agilent Technologies 161
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