Performance Tests 2
Keysight N8262A Service Guide 57
Rise/Fall Time (Peak Path)
Description
Linearity over the full input voltage range of the measurement path is warranted
to provide assurance of instrument accuracy. This test measures linearity by using
a calibration DAC and a calibration ADC (built into the DUT) to stimulate and
compare performance of the peak path against the measurement ADC, returning
the worst case percentage error.
Equipment
– 1 unit of 81130A pulse/data generator mainframe
– 2 units of 81131A output modules (installed in 81130A)
– 2 units of N1912-61017 calibration test cable
Test method
1 Capture a train of 10 pulses with very fast rise/fall times.
2 Combine the sample data to create an equivalent pulse with 10 units of the
sample resolution of the DUT.
3 Analyze the equivalent pulse to determine the 10% and 90% voltage levels of
the rising/falling edges.
4 Analyze the equivalent pulse to determine when the 10% and 90% crossover
points occur for both edges.
5 Using the times obtained for the 10% and 90% crossovers, the N7832A
software will calculate the rise/fall time performance of the DUT.
– This test cannot be performed manually, due to the complexity of the pulse
analysis algorithm.
– No adjustment is available for this test if it fails (see Chapter 5,
"Troubleshooting Guide").
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