Agilent Technologies 8133A Manual de Serviço Página 181
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Theory of Operation 8
16800 Series Portable Logic Analyzers Service Guide 181
Probes
Two types of logic acquisition cards can be used: one that
contains 6 probe pods, and one that contains 4 probe pods. One
pod pair is ignored in the 34- channel 16801A and 16821A logic
analyzer models.
Each pod is comprised of one cable and contains 16
single- ended data channels, a clock channel, two serial IIC
(Inter- IC, also known as I2C) programming lines for configuring
analysis probes, +5 V for powering analysis probes, and 22
ground signals. Each cable has a 40- pin probe cable connector.
The pods provide +5 Vdc ±5% auxiliary power to each 40- pin
probe cable connector. Each connector can deliver up to
300 mA with a maximum of 1.0 A total from the analyzer card.
A current limiting circuit protects the +5 V cable power from
current overload. The VCC_Enable signal is used to control
power to an analysis probe. Currently, the +5 Vdc is only
disabled during the IIC self- test.
A variety of single- ended probes can be connected to the logic
analyzer cables.
Comparators
The comparators are single- ended devices that interpret
incoming data and clock signals as either high or low. A
threshold voltage provided by a digital- to- analog-converter
(DAC) is coupled to the reference input of the comparator
through a precision resistor. Pod thresholds are individually
adjustable; clock and data share the same threshold. The
comparator outputs drive the acquisition ICs and clock divider
circuitry.
Acquisition IC
Each Acquisition IC processes 32 channels of data and 2
channels of clock information. The Acquisition ICs perform data
sampling, sequencing, store qualification, pattern recognition,
and counting functions. State or Timing sample clocks are sent
from the Master card to the Acquisition ICs in each of the
Expander cards in a multi- card module. Sampled data is
decelerated and passed to the Memory Controller for storage in
the Acquisition Memory RAM array.
The Acquisition ICs also contain the 4 GHz sample Timing Zoom
circuitry and memory.
- 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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