Technical data

28 4000 X-Series Oscilloscopes Service Guide
2 Testing Performance
To verify digital channel threshold accuracy (MSO models only)
This test verifies the digital channel threshold accuracy
specification of the Agilent 4000 X- Series oscilloscopes.
Threshold accuracy test limits: ±(100 mV + 3% of threshold
setting)
When to Test
You should perform this test every two years or after 4000
hours of operation, whichever comes first.
What to Test
Use these instructions to test the threshold settings of digital
channels D7- D0. Then, use the same instructions to test
digital channels D15- D8.
Verifying Test Results
After each threshold test, record the voltage reading in the
Performance Test Record on page 61. To verify whether a
test passes, verify that the voltage reading is within the
limits in the Performance Test Record.