Agilent Technologies 8133A Manual de servicio Pagina 174
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174 16800 Series Portable Logic Analyzers Service Guide
8 Theory of Operation
Fan Control The instrument uses a pair of 24 V fans driven
from a DC/DC boost converter circuit. This circuit creates a
linear voltage ramp from 12 V to 24 V across the operating
temperature range. The purpose of this circuit is to increase air
flow as needed while maintaining the lowest possible fan noise.
Front Panel Assembly
The identical front panel assembly with LCD is used on all
16800 Series logic analyzers. The front panel assembly is
composed of two PC boards comprising three independently
operating sub- systems. The two PC boards are the front panel
interface board and the keypad board. The three front panel
sub- systems are:
• Front panel keypad board.
• Front panel interface board.
• Front panel touch screen (Option 103).
Front Panel Keypad Board
The front panel switches consist of five buttons and one digital
encoder, the knob. When a button is pressed and released, or
the knob turned, a series of codes are sent back to the module
FPGA. When the module FPGA receives a front panel code, an
interrupt is sent to the system CPU. The resulting ISR will read
the code and act on it.
The module FPGA was used as a convenient place to put this
logic. This logic operates independently of the module
backplane logic also within the module FPGA.
Front Panel Interface Board
The front panel interface board plugs into the CPU
motherboard’s PCI Express x16 slot and provides a connection
point for flat- panel display communication.
The connectors J2 and J3 are connected to a Mitsubishi 15”
XGA
AA150XN01 TFT- LCD 1024x768 display:
• Connector J2 provides the data path back to an Adlink video
adapter.
• Connector J3 is used to provide the high- voltage needed to
light the display backlight. This high-voltage is generated
using a power inverter board, which is mounted on the front
panel interface board. This power inverter board is a TDK
CXA- 0384 DC-AC Inverter Unit.
- Agilent 16800 Series 1
- Portable Logic Analyzers 1
- Model Comparison 3
- Features, Logic Acquisition 3
- Features, Mainframe 4
- Features, Pattern Generator 4
- Supplied Accessories 4
- Optional Accessories: 4
- Service Strategy 4
- In this Service Guide 6
- 4 Calibrating and Adjusting 8
- 7 Replaceable Parts 10
- 8 Theory of Operation 10
- Contents 11
- General Information 13
- Accessories 14
- Specifications 15
- Characteristics 16
- Non-Operating Environment 17
- Dimensions 18
- Recommended Test Equipment 19
- 1 General Information 20
- Preparing for Use 21
- To inspect the logic analyzer 22
- To apply power 22
- To clean the instrument 23
- To start the user interface 23
- To test the logic analyzer 23
- 2 Preparing for Use 24
- Testing Performance 25
- To perform the power-up tests 26
- Logic Analyzer Test Strategy 27
- 3 Testing Performance 28
- Testing Performance 3 31
- Equipment Required 34
- Perform System Self-Tests 36
- Set Up the Test Equipment 37
- Connect the Test Equipment 39
- Deskew the oscilloscope 42
- Set the 8133A pulse width 43
- Configure the Logic Analyzer 45
- Run eye finder 49
- To re-align a stray channel 50
- Test Pod 1 in 250 Mb/s Mode 52
- Test Pod 2 in 250 Mb/s Mode 57
- Test the remaining pods 59
- Test Pod 1 in 500 Mb/s Mode 60
- Test Pod 2 in 500 Mb/s Mode 64
- Conclude the State Mode Tests 66
- Performance Test Record 68
- Calibrating and Adjusting 69
- Calibration Strategy 70
- Troubleshooting 71
- Try , and then 75
- Power Supplies 84
- To run the self-tests 88
- Bit#: 39 - 16 15 - 8 7 - 0 92
- Clock Test 93
- Simple RAM Test 93
- RAM Persistence Test 94
- Marching Bits RAM Test 94
- Wait Test 94
- Instruction Interrupt Test 95
- To exit the test system 96
- 5 Troubleshooting 100
- Set up the test equipment 101
- Connect the test equipment 101
- Threshold 102
- Troubleshooting 5 109
- Clock Frequency of 100 MHz 111
- Click Run Rep 111
- Replacing Assemblies 113
- Replacement Strategy 114
- Tools Required 114
- To save the license file 115
- To power off the system 116
- Replacing Assemblies 6 117
- 6 Replacing Assemblies 118
- 600 watt power supply 119
- Secondary power supply 120
- 60 mm fan 144
- 92 mm fans 145
- Returning Assemblies 148
- FRAGILE 149
- Replaceable Parts 151
- Ordering Replaceable Parts 152
- System Replaceable Parts List 155
- Replaceable Parts 7 159
- • A — Assembly 163
- • MP — Mechanical Part 163
- • W — Cable 163
- Theory of Operation 167
- System Block Level Theory 168
- Module Interface Board (MIB) 169
- CPU Subsystem 170
- PCI board 171
- MIB (Module Interface Board) 171
- Module Bus FPGA(s) 172
- I/O FPGA 172
- Theory of Operation 8 173
- Front Panel Assembly 174
- Power Up Routine 175
- Product install 178
- Software recovery methods 178
- Self Test 179
- Comparators 181
- Acquisition IC 181
- Master/Expander Connectors 182
- Instruction Memory 183
- Data Memory 183
- Output Driver 184
- Clock Circuit 184
- CPU Interface 184
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