Tektronix 071-0590-00 user manual Confirmation of Generator Output Data Level Change

Performance Verification

Confirmation of Generator Output Data Level Change

In this part of the functional test procedure, you will verify that the Analyzer threshold responds correctly to the sample values of baseline offset and amplitude in the Generator output. The sample values and threshold limits are summarized in the following Data Levels table. Repeat steps 21 through 27 for each row of the Data Levels table.

Note

Values in the following table are repeated; the purpose of this test is to determine that the GB1400 responds correctly to changes in data level. You do not need to read the results except at Step 26.

Data Levels

Generator Baseline Offset	Generator Amplitude	Analyzer Threshold Limits
−1.00	1.00	−0.70 to −0.30
0.00	1.00	0.30 to 0.70
−1.00	2.00	−0.20 to 0.20

qStep 21: Connect the cable to DATA THRESHOLD on the rear panel of the Analyzer.

qStep 22: In the Generator OUTPUT section, the DATA LED should be on. If not, press the ‘DATA’ key. The INVERT DATA LED should be off. If it is not, press the key to turn it off.

qStep 23: Use the Generator BASELINE OFFSET up/down keys to set the baseline offset value shown in the Generator Baseline Offset column of the Data Levels table.

qStep 24: Use the AMPLITUDE up/down keys to set the amplitude to the value shown in the Generator Amplitude column of the Data Levels table.

qStep 25: At the Generator, select another PRBS pattern (using the PATTERN up/down keys) to initiate a resynchronization by the Analyzer.

qStep 26: Select the PRBS pattern PN7.

qStep 27: At the Analyzer, verify that once the green LOCK LED in the SYNC section lights, the displayed threshold is between the limits shown in the Analyzer Threshold Limits column of the Data Levels table. Cycle through all five PRBS patterns (PN7, PN15, PN17, PN20, and PN23) and verify that the Analyzer synchronizes on each pattern.

qStep 28: At the Analyzer, press the CLEAR button in the ERROR HISTORY section to ensure than the SYNC LOSS LED is off.

E-6 GB1400 Acceptance Test