Agilent Technologies 1912A Guia do Utilizador Página 183
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Using E9300 E-Series Power Sensors 5
N1911A/1912A P-Series Power Meters User’s Guide 157
Measuring Spread Spectrum and Multitone Signals
To achieve high data transfer rates within a given bandwidth, many
transmission schemes are based around phase and amplitude (I and Q)
modulation. These include CDMA, W-CDMA and digital television. The
signals are characterized by their appearance on a spectrum analyzer
display — a high amplitude noise- like signal of bandwidths up to 20 MHz.
An 8 MHz bandwidth digital television signal is shown in Figure 5- 116.
Figure 5-116Spread spectrum signal
The diode pair/attenuator/diode pair architecture of the E9300 E- Series
power sensors is ideally suited to the average power measurement of these
signals. The sensors have wide dynamic range (80 dB max, sensor
dependent) and are bandwidth independent.
Some signal modulation formats such as orthogonal- frequency- division
multiplexing (OFDM) and CDMA have large crest factors. The
E- Series E9300/1/4A power sensors can measure +20 dBm average power
even in the presence of +13 dB peaks but the peak pulse duration must be
less than 10 microseconds. For high power applications, such as
base- station testing, the E9300/1B and E9300/1H are recommended.
- Agilent 1
- N1911A/1912A 1
- P-Series Power 1
- Certification 3
- General Warranty 3
- Warranty Service 3
- Limitation of Warranty 4
- Exclusive Remedies 4
- Restricted Rights Legend 5
- Technology Licenses 5
- Safety Summary 6
- Safety Notices 6
- Safety Symbols 7
- General Safety Information 10
- Environmental Conditions 11
- Regulatory Information 11
- Regulatory Markings 12
- In This Guide 14
- Contents 15
- 10 Maintenance 17
- List of Figures 19
- List of Tables 25
- Rack Mounting 28
- Specifications 29
- 1 Introduction 32
- Key Function 32
- Introduction 1 33
- Connector Function 35
- The Display Layout 36
- 1820 1921 39
- Select TgDel 42
- Window Symbols and Pop-ups 44
- Wait Symbol Pop-up 45
- Confirm Symbol Pop-up 45
- Numeric Entry Pop-up 45
- Text Entry Pop-up 46
- Trace Scaling Pop-up 46
- List Pop-up 47
- Select the instrument/ 48
- Remote Interfaces 49
- General Power Meter Functions 55
- Setting the Resolution 59
- Making Relative Measurements 60
- Meas Config 62
- Channel A B 62
- Setting Display Offsets 67
- Measurement 68
- Selected Window/ 68
- Offset Setting Field 68
- Offset Value Field 68
- Freq. Dep. Offset 69
- Offset Table A Selected 71
- up window 74
- Setting Measurement Averaging 75
- Step Detection 77
- Setting the Video Averaging 78
- Setting the Video Bandwidth 80
- Auto Gate 85
- Auto Gate Settings 86
- Gate 1 Ref 1 0.0% 86
- Gate 1 Ref 2 0.0% 86
- Perpetual Off On 87
- Setting up the Channel Trace 88
- Watt or dBm 90
- Auto Scale 91
- Setting the Trigger 92
- Rising Edge 96
- Power Sweep Mode 99
- Power Meter 100
- Power Source 100
- Power Sensor 100
- (optional connection) 100
- Cont Trig 101
- Sing Trig 101
- Example of SCPI commands set 104
- Normal mode 104
- Average mode 105
- Frequency Sweep Mode 106
- Setting Measurement Limits 112
- Setting Limits 113
- Checking for Limit Failures 115
- 16 measurements per channel 116
- Numeric Format 117
- Single Function Measurement 118
- Combined Measurement 121
- Scaling the Analog Display 123
- Increment Multiplier 124
- Decrement Multiplier 124
- Recorder Output 125
- N1911A/N1912A Option H02 128
- Save/Recall 130
- Editing a Register’s Name 131
- Recalling a Measurement Setup 132
- When to Zero? 133
- Automatic Zero 133
- Calibration 134
- Manual Calibration 135
- Zero/Cal Lockout 136
- Presetting the Power Meter 137
- Setting the Cable Short/Long 139
- Using P-Series Power Sensor 141
- Introduction 142
- Setting the Trace Display 144
- Step 3. Setting the Trigger 146
- Gate 1 Active 148
- Marker 1 Active 148
- Active Marker 148
- Falling Edge 152
- Channel Setup 153
- Setting Offsets 154
- Trigger Setup 154
- Measurement Setup 155
- 3 Using P-Series Power Sensor 156
- Agilent Technologies 157
- Frequency 159
- Amplitude 159
- E9323A and E9327A sensors 159
- Power Meter Configuration 160
- Measurement Accuracy 162
- Disp Type 166
- Default Channel Setup 180
- CDMA Signal Measurements 184
- Multitone Signal Measurements 185
- Measuring TDMA Signals 186
- Procedure 187
- Setting the Range 189
- Measurement Considerations 190
- Accuracy 191
- Speed and Averaging 191
- to complete the entry 208
- Sensor Calibration Tables 210
- Insert Char 215
- Delete Char 215
- Option CFT 223
- display mode is chosen, the 233
- Sensor Table 2 Selected 236
- Function (CCDF) 243
- Setting the CCDF Table 245
- Expanded CCDF Table 246
- Full Screen CCDF Table 247
- Setting the CCDF Trace 248
- Step 2: Setting the Marker 249
- Step 3: Setting the Scale/Div 250
- Store to Reference 251
- Reference 251
- Trace Display 251
- Maintenance 253
- Self Test 254
- Instrument Self Test 255
- Remote Testing 256
- Test Descriptions 256
- Error Indicator 258
- Error Message List 260
- Operator Maintenance 269
- 10 Maintenance 270
- Check the Basics 271
- Instrument serial numbers 272
- MADE IN MALAYSIA 273
- Erasing Memory Data 274
- Conditions 281
- Measurement uncertainties 281
- Power Meter Specifications 282
- Power Sensors Compatibility 283
- Meter Uncertainty 283
- Remote Programming 284
- Timebase 284
- Bandwidth 284
- Measurement Characteristics 285
- Measurement Speed 286
- Pulse Characteristic 286
- Line Power 288
- 1 mW Power Reference 289
- Physical Characteristics 291
- Settings 293
- Characteristic Peak Flatness 294
- Noise and Drift 295
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