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53220A/53230A User’s Guide 133
53220A/53230A Input Signal Conditioning 4
For frequencies in this range, use the CONFigure command and turn off
auto-level by specifying an absolute threshold level. For example:
//measure a 10 Hz signal
CONF:FREQ 10, (@1) // measure 10 Hz signal
INP:IMP 50 // set impedance to 50 ohms
INP:RANG 5 // set range to 5V
INP:COUP AC // set AC coupling
INP:LEV 1 // 1V threshold, turns off auto-level
INIT // take reading
Input Coupling and Threshold Levels
Figure 4-5 shows a scale of how relative thresholds apply to the input signal.
When the signal includes a DC offset, the absolute value of a relative threshold
is a function of the input coupling (AC or DC).
Figure 4-5. Input Coupling and Relative Threshold Levels.
For example, a 3 Vpp input signal with a 2 VDC offset and DC coupling would
have a Vmax: value of 3.5V and a Vmin value of 0.5V (Vmax, Vmin, and Vpp are
viewable on the front panel). With AC coupling, Vmax and Vmin would be
+
1.5V respectively.
AC coupling
DC coupling
0%
100%
100%
0%
0V
(
Vmax:)
(Vmin:)
(Vmax:)
(Vmin:)
- Agilent 53220A/53230A 1
- 350 MHz Universal 1
- Frequency Counter/ 1
- 2 53220A/53230A User’s Guide 2
- Safety Information 3
- Safety Notices 4
- Safety Symbols 4
- Protection Limits 4
- Installing the Instrument 4
- 6 53220A/53230A User’s Guide 6
- 53220A/53230A User’s Guide 7 7
- 8 53220A/53230A User’s Guide 8
- 53220A/53230A User’s Guide 9 9
- 10 53220A/53230A User’s Guide 10
- Contents 10
- Preparation for Use 11
- 1 Preparation for Use 12
- Front and Rear Panel Overview 13
- Front Panel 13
- Rear Panel 14
- About the Instrument 15
- No Manuals? 16
- °C to +55 °C 17
- °C to +70 °C 17
- Electrical Requirements 18
- Applying Power 18
- Power-On LED Status 19
- Standby Power 19
- Battery Operation 20
- Battery Care 22
- °C, OCXO powered) 22
- °C to +60 °C (storage) 22
- Using Built-In Help 23
- Utility Functions 23
- Display Configuration 23
- Numeric Format 24
- Screen Control 25
- Screen Capture 26
- User Interaction 27
- Reference Settings 28
- Measurement Time Out 29
- Time Base 29
- Auto Level 30
- Securing the Instrument 32
- Agilent Technologies 35
- Software Requirements 36
- Obtaining the IP Address 37
- 169.254.2.30 38
- A-53230A-00050 38
- A-53230A-00050.local 38
- Web Interface Overview 39
- Loading the Software 42
- Installing Instrument Drivers 43
- Configuring the LAN Interface 44
- Locating the Instruments 45
- Socket connection 47
- Host Names 48
- Configuring the USB Interface 49
- The USB Address String 50
- Disabling the USB Interface 51
- 53220A/53230A User’s Guide 53 53
- The GPIB Address String 54
- Changing the GPIB Address 54
- Disabling the GPIB Interface 54
- Using Interactive IO 55
- Firmware and Driver Updates 56
- SCPI Language Emulation Mode 57
- 53220A/53230A Measurements 63
- Counter Measurement Summary 64
- 53220A/53230A User’s Guide 65 65
- 53220A/53230A Measurements 3 65
- Reference Oscillator Source 66
- External Reference Example 68
- Setting the Measurement Mode 71
- Reading #1 72
- Reading #2 72
- Reading n 72
- SCPI Syntax Conventions 75
- Low-Level Command/Subsystem 77
- 78 53220A/53230A User’s Guide 78
- 3 53220A/53230A Measurements 78
- Using MEASure 79
- Using CONFigure 79
- Using CONFigure? 80
- Frequency 81
- Frequency Ratio 83
- Frequency Ratio Examples 84
- Period Measurement Examples 86
- Time Stamp 87
- Time Interval 90
- Rise Time and Fall Time 94
- Pulse Width 97
- Duty Cycle 100
- ° and 360° 104
- Single-Period 105
- Totalizing Measurements 107
- Continuous 110
- Burst Pulse Measurements 112
- Carrier Frequency 113
- Pulse PRI and PRF 114
- PRI and PRF Examples 116
- Positive and Negative Widths 117
- 53220A/53230A Input Signal 119
- Conditioning 119
- Channel Characteristics 120
- Signal Conditioning Path 120
- Parameter 121
- Input Impedance 122
- Impedance Example 122
- Input Protection 123
- Input Range 124
- Range Example 124
- Setting the Probe Factor 125
- Input Coupling 126
- Coupling Example 127
- Using Auto-Level 131
- Relative Threshold Example 132
- AC coupling 133
- DC coupling 133
- System Auto-Level Range 134
- Detector Threshold Example 137
- Noise Rejection (Hysteresis) 137
- Noise Rejection Example 138
- Threshold Slope 139
- Input Slope Example 140
- Color Strength 141
- Description 141
- Triggering and Gating 143
- Settings Summary 144
- Trigger and Gate Time Line 145
- Trigger and Gate Cycle 145
- 5 Triggering and Gating 146
- Triggering and Gating 5 147
- System Trigger 148
- System Trigger Source 149
- Trigger Source Example 150
- Trigger Slope Example 151
- Trigger Delay Example 152
- Trigger Count Example 152
- Sample Count Example 153
- Triggered state 154
- Wait-for-trigger state 154
- Initiating Example 155
- READ? Example 155
- Measurement Gate 156
- Gate Set Up 156
- Frequency Measurements 158
- Setting the Gate Time 160
- External Gate Sources 162
- External Gate Signal Polarity 162
- Gate Source ADVanced 164
- Totalizing 165
- Continuous Totalizing 169
- Time Interval Measurements 170
- Setting Narrow Pulse Mode 174
- Setting a Gate Start Delay 181
- Gate Stop Source 183
- Gate Slope 183
- Gate Stop (closed) 183
- External Gate Source 183
- Gate Stop Hold Off 183
- Gate Stop Hold Off Source 184
- Automatic Gate Extension 189
- Data Logging 191
- Math Functions 192
- Smoothing Data 194
- Smoothing Example 195
- Scaling Functions 195
- Enabling the Scale Functions 196
- Using the Scale Functions 197
- Scale Reference Value 198
- Reference Example 199
- (query form) 200
- Assigning Reading Units 201
- Scaling Example 202
- Statistics 203
- Reading Count 204
- Allan Deviation 206
- Standard Deviation 207
- Clearing/Resetting Statistics 207
- Limit Checking 208
- Enabling Limit Checking 209
- Example: Limit Checking 210
- Histograms 211
- Viewing Histograms 212
- Histogram Configuration 213
- Number of Bins 215
- Lower and Upper Ranges 216
- Automatic Range Setting 218
- Resetting the Histogram 220
- Zoom & Markers View 221
- Trend Charts 224
- Viewing Trend Charts 225
- Trend Chart Boundaries 226
- Clearing the Trend Chart 227
- Saving Readings 227
- Zoom & Markers Window 228
- Reading Decimation 229
- Configuring the Data Logger 232
- Specifying a Data Log File 232
- Setting the Duration 233
- Setting a Start Delay 233
- Starting the Data Logger 234
- Viewing Readings 234
- Stopping the Application 235
- Formats and Data Flow 237
- Reading Formats and Data Flow 238
- Specifying a Format 239
- Data Flow 240
- Front Panel Display 241
- Reading Memory 241
- FETCh? Example 243
- R? Example 243
- DATA:REMove? Example 245
- DATA:LAST? Example 245
- Memory Threshold Example 246
- Counter File System 247
- 7 Formats and Data Flow 248
- Creating Folders 249
- Specifying a Default Folder 251
- Creating Data Files 251
- Creating a Data File Example 252
- Creating State Files 253
- State File Example 254
- Storing User Preferences 255
- Using *SAV and *RCL 256
- User-Defined Power-On States 258
- Managing Folders and Files 261
- Deleting a Folder Example 261
- Deleting State Files 263
- Copying and Moving Files 264
- Folder Catalogs 265
- MMEMory:CATalog[:ALL]? 266
- Instrument Status 267
- 8 Instrument Status 268
- Condition Register 269
- Event Register 269
- Enable Register 270
- Standard Event Register 272
- Status Byte Register 273
- Appendix A 275
- 53220A/53230A Error Messages 275
- Command Errors 276
- Execution Errors 278
- Device Specific Errors 280
- Query Errors 281
- Instrument Errors 281
- Calibration Errors 285
- Self-Test Errors 286
- Numerics 289
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