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Making Measurements 4
N9340A User’s Guide 49
Decreasing the Resolution Bandwidth
Resolution bandwidth settings affect the level of
internal noise without affecting the amplitude level
of continuous wave (CW) signals. Decreasing the
RBW by a decade reduces the noise floor by 10 dB.
1 Refer to “Reducing Input Attenuation" on
page 47, and follow steps 1, 2 and 3.
2 Decrease the resolution bandwidth:
• Press [BW/SWP] > {RBW}, and toggle the RBW
setting to Man (manual), then decrease the
resolution bandwidth using the knob, the
arrow keys or the numeric keypad.
The low level signal appears more clearly because
the noise level is reduced.
Figure 9 Decreasing resolution bandwidth
- User’s Guide 1
- 2
- Contents 3
- 5 Key Reference 4
- 6 SCPI Command Reference 4
- 7Error Messages 5
- 8 Menu Map 5
- Documentation Conventions: 5
- Overview 7
- Introduction 8
- Optimized Usability 9
- Front Panel Overview 10
- Top Panel Overview 11
- 15:44:03 03,10,08 12
- Instrument Markings 13
- 1Overview 14
- 8 N9340A User’s Guide 14
- Getting Started 15
- Safety Considerations 17
- 1 Getting Started 18
- 12 N9340A User’s Guide 18
- Power Requirements 19
- AC Power Cords 20
- Environmental Requirements 21
- Electrical Requirements 21
- Working with Batteries 22
- Charging a Battery 23
- Power on your N9340A 24
- • turn off backlight 25
- • turn off screen display 25
- Entering Data 27
- Some Helpful Tips 29
- Saving Multiple Test Setups 30
- Upgrading Firmware 31
- Adding an option 31
- System Setting 33
- Visual and Audio Adjustment 34
- Ext Input 36
- Quick saving a setup 37
- Quick recalling a setup 37
- Parameters) 37
- File Types 38
- Saving a file 39
- Viewing file list 40
- Deleting a file 41
- Loading a file 41
- Show System 42
- Show Error 43
- Factory Default Settings 45
- 4System Setting 46
- 40 N9340A User’s Guide 46
- Making Measurements 47
- Measuring Multiple Signals 48
- Directional 50
- Signal generator 50
- Resolving Small Signals 52
- Hidden by Large Signals 52
- Measuring a Low-Level Signal 53
- Increased Sweep Time 56
- Trace Av eragi ng 57
- One-button Power Measurement 65
- Measuring ACPR 66
- Measuring Channel Power 67
- Channel Bandwidth 68
- Low-pass Filter 71
- N9340A 73
- Making Measurements 4 75
- N9340A User’s Guide 69 75
- Calibration Routine 76
- 4 Making Measurements 82
- 76 N9340A User’s Guide 82
- Key Reference 83
- Amplitude 84
- Scale/DIV 85
- Scale Type 85
- Ref Offset 86
- Y Axis Units 86
- Spectrum Analyzer 87
- Track ing G ener ator 87
- Amptd Step 88
- Amptd Offset 88
- Normalize 88
- Power Meter 90
- Meas Disp 91
- Meas Setup 92
- Avg Type 96
- In non-zero spans: 98
- In zero span: 98
- In FFT Mode 99
- Sweep Mode 99
- Single Sweep 100
- CAU-CAUTION 102
- Frequency 103
- Peak Search 107
- • Freq Count 108
- Marker Trace 109
- Last Span 111
- Clear Write 112
- Max Hold 112
- Minimum Hold 113
- Detector 113
- Save Trace 116
- Recall Trace 116
- Limit Line 117
- Limit Pattern 117
- Set Pattern 117
- Limit Type 117
- Save Pattern 118
- Recall Pattern 118
- SCPI Command Reference 119
- SCPI Language Basics 120
- Basic Knowledge Requirement 121
- Command Categories 121
- Command Syntax 121
- Standard Notations 122
- Default unit of parameters 123
- Common Commands 124
- CALCulate Subsystem 125
- Control Limit line Buzzer 126
- Control Limit Line Testing 126
- Set Limit Line Y-axis value 126
- Control Limit Pattern Testing 127
- Define Limit Pattern Values 128
- CALCulate:MARKer Subsection 129
- Marker Function 130
- Marker Mode 131
- Marker On/Off 132
- Marker to Trace 132
- Marker readout: X Value 133
- Marker readout: Y Value 133
- DEMOdulation Subsystem 134
- DISPlay Subsystem 135
- Vertical Axis Scaling 137
- Display Mode 137
- Contrast 138
- Brightness 138
- INITiate Subsystem 139
- Select One button measurement 140
- MEASure Subsystem 141
- ACPR Subsection 142
- Low Adjacent Channel Power 143
- Upper Adjacent Channel Power 143
- Channel Power Subsection 144
- SENSe Subsystem 145
- Turn Averaging On/Off 146
- Set the Average Count 146
- [:SENSe]:BANDwidth Subsection 147
- Video Bandwidth Automatic 148
- [:SENSe]:DETector Subsection 149
- FREQuency Subsection 150
- Center Frequency Step Size 151
- Frequency Span 151
- Full Frequency Span 151
- Zero Frequency Span 151
- Last Frequency Span 152
- Start Frequency 152
- Stop Frequency 152
- [:SENSe]:POWer Subsection 153
- SWEep Subsection 154
- SYSTem Subsystem 155
- TRACe Subsystem 156
- Tracking Generator Subsystem 157
- Amplitude Step 158
- Amplitude Offset 158
- Storing as reference 158
- Normalization 159
- Normalization Reference Level 159
- Reference Trace 160
- TRIGer Subsystem 161
- UNIT Subsystem 162
- Error Messages 163
- Error Message List 164
- Menu Map 167
- 8Menu Map 168
- 162 N9340A User’s Guide 168
- Menu Map 8 169
- N9340A User’s Guide 163 169
- 164 N9340A User’s Guide 170
- N9340A User’s Guide 165 171
- 166 N9340A User’s Guide 172
- N9340A User’s Guide 167 173
- 168 N9340A User’s Guide 174
- N9340A User’s Guide 169 175
- 170 N9340A User’s Guide 176
- *N9340-90001* 179
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