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Theory of Operation 8712ET/ES and 8714ET/ES
System Theory RF Network Analyzers
6-6 Service Guide
Power Supply (A6)
The power supply group consists of the power supply assembly. This switching power
supply provides regulated DC voltages to power all assemblies in the analyzer through a
connection to the backplane. The backplane serves as a motherboard to provide power,
data, and control signal connections to the various assemblies.
A voltage selector switch, accessible at the rear panel, adapts the analyzer to local line
voltages of approximately 115 V or 220 V nominal. Refer to your analyzer's User's Guide
for line voltage tolerances and other power considerations.
The power supply has a standby state (instead of an off state) when the AC power is
connected. In standby, the A6 assembly provides a standby supply, measuring between
+12 V and +13 V, to power the non-volatile SRAM on the CPU board. (A battery provides
power to the non-volatile SRAM when the instrument is disconnected from AC power.) The
power supply switches on when the on/standby switch is grounded. In the on state, the
power supply provides the following supplies to the instrument: +5 V, +15 V, −15 V, and
+12 V.
Two diagnostic LEDs are visible from the rear panel. The green LED is on in normal
operation. It is off when the line power is absent or set too low, or if the line fuse has blown.
The red LED is on in standby but off during normal operation. It will blink to indicate a
power supply shutdown. Refer to Chapter 4, “Troubleshooting and Block Diagrams,” for
more details.
Digital Control Group
This group includes the front panel (A1), CPU (A2), display (A7) and 3.5" internal disk
drive (A8) assemblies.
Front Panel Assembly (A1)
The A1 front panel assembly allows the user to control the analyzer. It includes a keyboard
and a front panel knob. A probe power jack that supplies +15 V and −12.6 V is available for
use with RF probes and other accessories. Fuses for these supplies are on the back of the
A1 front panel assembly PC board.
CPU Assembly (A2)
The A2 CPU assembly provides most of the control, interface, and data processing
functions in the analyzer. It contains several microprocessors and many different types of
memory, as shown on the analyzer's overall block diagram.
The main CPU is an MC 68030 microprocessor which is augmented by a floating point
coprocessor (68882). It is the master controller for the analyzer, including the other
dedicated processors on the CPU assembly. When the analyzer is the system controller in a
GPIB system, it also controls peripheral devices through the GPIB interface.
The TMS 320C32 digital signal processor (DSP) receives the digital data from the A5
receiver assembly and performs data processing functions such as digital filtering,
averaging, and applying error correction. It has some dedicated SRAM for running its
firmware, and it also uses some shared DRAM and SRAM which is used to transfer data
with the CPU.
- Service Guide 1
- Certification 2
- Documentation Map 3
- Contents 5
- 1 Performance Checks 9
- RF Network Analyzers 10
- 1-2 Service Guide 10
- Equipment List 11
- 6. Press 13
- 7. Press 13
- Service Guide 1-7 15
- Trigger Hold 17
- Performance Test Software 18
- Estimated Time 19
- Equipment 20
- File Structure 21
- Configuration File 22
- Getting Started 23
- Configuration Menu 24
- Service Guide 1-17 25
- 1-18 Service Guide 26
- CAL DATA ENTRY 26
- Using the Program 27
- Test Selection Menu 29
- Additional Information 30
- PRINT RESULTS 31
- PT01: Frequency Accuracy 32
- PT02: Gain Compression 33
- PT03: Noise Floor 34
- PT04: Dynamic Accuracy 35
- PT05: Power Flatness 36
- PT06: Absolute Power Accuracy 37
- 1-30 Service Guide 38
- PT08: Directivity 39
- 1-32 Service Guide 40
- PT09: Harmonics 41
- PT10: Trace Noise 42
- PT11: Crosstalk 43
- Specifications 44
- System Performance 45
- Service Guide 1-39 47
- Service Guide 1-41 49
- Service Guide 1-43 51
- Service Guide 1-45 53
- Service Guide 1-47 55
- Service Guide 1-49 57
- Service Guide 1-51 59
- Service Guide 1-53 61
- Service Guide 1-55 63
- Test Port Output 65
- Service Guide 1-59 67
- Test Port Input 71
- Service Guide 1-65 73
- Service Guide 1-67 75
- Service Guide 1-69 77
- 1. Narrowband detection mode 78
- Service Guide 1-71 79
- General Information 81
- Service Guide 1-75 83
- Service Guide 1-77 85
- 1-78 Service Guide 86
- Features 87
- Data Markers 88
- Marker Functions 88
- Internal Memory 88
- Disk Drive 88
- Network File System (NFS) 88
- Data Hardcopy 89
- Automation 89
- Measurement Calibration 90
- Calibration Interpolation 91
- Available Calibrations 91
- Calibration Kits 92
- Test Sets 93
- 2Adjustments 94
- 2-4 Service Guide 97
- Frequency Accuracy Adjustment 98
- Required Equipment 100
- Procedure 100
- In Case of Difficulty 101
- Service Guide 2-9 102
- SYSTEM OPTIONS 117
- 2-24 Service Guide 117
- 3Assembly Replacement 119
- Introduction 120
- Service Guide 3-3 121
- 3-4 Service Guide 122
- Service Guide 3-5 123
- 3-6 Service Guide 124
- Service Guide 3-7 125
- 3-8 Service Guide 126
- Service Guide 3-9 127
- 3-10 Service Guide 128
- Removing the Source Assembly 129
- 3-12 Service Guide 130
- Service Guide 3-13 131
- 3-14 Service Guide 132
- Removing the Coupler 133
- Installing the Coupler 134
- Installing the Switch 134
- Installing the Attenuator 135
- Installing the Limiter 136
- Service Guide 3-19 137
- Removing the Display Assembly 138
- Service Guide 3-21 139
- 3-22 Service Guide 140
- Service Guide 3-23 141
- How to Order Parts 142
- 8712ET/ES and 8714ET/ES 143
- Service Kit 145
- How to Use the Extender Board 146
- Initializing 147
- Operator's Check 148
- Check the Rear Panel LEDs 149
- 4-8 Service Guide 150
- Removing the Assemblies 151
- Error During Power-up 152
- Test Status LEDs 153
- 4-12 Service Guide 154
- Service Guide 4-13 155
- Service Guide 4-15 157
- Coefficients 158
- Front Panel Problems 159
- Other Power-Up Problems 159
- Other Error Messages 159
- 4-18 Service Guide 160
- Service Guide 4-19 161
- 4-20 Service Guide 162
- Service Guide 4-21 163
- 4-22 Service Guide 164
- Service Guide 4-23 165
- 4-24 Service Guide 166
- Service Guide 4-25 167
- 4-26 Service Guide 168
- Service Guide 4-27 169
- 4-28 Service Guide 170
- Service Guide 4-29 171
- Service Guide 4-31 173
- Mechanical Problems 175
- Receiver Detector Problems 175
- Service Guide 4-35 177
- 4-36 Service Guide 178
- RF Power Problems 179
- DIN Keyboard 180
- RS-232 Printers and Plotters 180
- Floppy Disk Drive Maintenance 180
- GPIB Systems 181
- LAN Troubleshooting 182
- Service Guide 4-41 183
- Testing between Two Analyzers 184
- 0.0.0.0 and 185
- LAN State ON off 185
- Service Guide 4-47 188
- 4-48 Service Guide 189
- 5Service Related Menus 190
- Figure 5-1 Service Key Menus 192
- Tests and Adjustments Menu 193
- Select Self-Test Menu 194
- Select Adjustment Menu 197
- Instrument Info 199
- Update Corr Const Menu 200
- Service Utilities Menu 1 201
- Meas Cal Options Menu 204
- Analog Bus Menu 205
- Service Guide 5-17 206
- Service Utilities Menu 2 208
- Service Utilities Menu 3 209
- Service Guide 5-21 210
- 5-22 Service Guide 211
- Syntax Summary 212
- Softkey SCPI Commands 212
- <num> 213
- Service Guide 5-25 214
- 6Theory of Operation 216
- System Theory 218
- 6-4 Service Guide 219
- Service Guide 6-5 220
- Power Supply (A6) 221
- Digital Control Group 221
- Display Assembly (A7) 222
- Source Group 223
- Service Guide 6-9 224
- Controlling Spurs 225
- Service Guide 6-11 226
- Receiver Assembly (A5) 227
- RF Path of the ET Analyzer 228
- Limiters 229
- Service Guide 6-15 230
- RF Path of the ES Analyzer 231
- 7Parts List 232
- Analyzer Hardware 233
- Parts” on page 3-24 234
- Service Guide 7-5 236
- Description 237
- HP/Agilent 237
- Part Number 237
- Service Guide 7-7 238
- Service Guide 7-9 240
- 7-10 Service Guide 241
- Service Guide 7-11 242
- 7-12 Service Guide 243
- 7-14 Service Guide 245
- Service Guide 7-17 248
- Service Guide 7-19 250
- Service Guide 7-21 252
- 8-2 Service Guide 254
- Service Guide 8-3 255
- In Case of Difficulties 256
- Obtaining Firmware 258
- Safety Symbols 260
- General Safety Considerations 261
- Lithium Battery Disposal 262
- Warranty 263
- Assistance 264
- Shipment for Service 264
- Service Guide 9-7 265
- Index Index-1 266
- 2-Index Index 267
- Index Index-3 268
- 4-Index Index 269
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