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94 16800 Series Portable Logic Analyzers Service Guide
5 Troubleshooting
RAM Persistence Test
The RAM persistence test verifies the module memory
refresh, addressing and data retention. A pattern sequence is
written to blocks in module memory. Because of this pattern
writing process, a long delay is introduced before the
patterns are read and verified. The patterns are then read
and verified, then compared with known values.
Passing the RAM persistence test implies that the module
memory retains the data at each memory location that is
programmed.
In case of error, the following diagnostic integer indicating
the status of the memory IC number will be displayed.
The one bit value has the following definition:
• 0 - passed
• 1 - failed
Marching Bits RAM Test
The marching bits RAM test is a very extensive test and may
take hours to complete. Therefore this test is not included in
“Test All.” If the simple RAM test and RAM persistence test
are run and you still suspect a memory problem, then run
the marching bits RAM test.
The marching bits RAM test attempts to uncover any
possible failure mode of module memory. Several walking “0”
and walking “1” patterns are written to memory, read, and
compared with known values. A total of five read/write
passes are done with each pattern.
Passing the marching bits RAM test implies there is very
high confidence that every module memory IC data and
address memory pipeline is operating properly.
Wait Test
The wait test verifies the correct operation of the WAIT
pattern registers in the module backplane interface IC. Test
events are loaded into the WAIT pattern registers, then
correct operation of the module is verified.
Bit#:15 - 7 6543210
not
used
#7&8654321
- 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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