Keysight Technologies N5990A, User Manual

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Keysight N5990A MIPI M-PHY Receiver Test User Guide 5
Appendix A
Controlling Loop Parameters and Looping Over Selected Tests
Often, parameters such as temperatures or supply voltages need to be
varied systematically. A simple example would be repeating tests over a
temperature range from -10 to 30 °C to verify an operating temperature
range. In this case, after the tests have been run at -10 °C, the
temperature of the climate chamber is increased by the selected
temperature step width, for example, 1°C. The tests are then repeated at
-9 °C. After test execution, the temperature is incremented again and the
tests are re-run repeatedly until they are finally run at 30 °C. This repetitive
process is called looping. In this example, the temperature within a climate
chamber is the loop parameter. While the loop is executed, test results
have to be documented for each loop parameter value. In practice,
multiple loop levels might be required, as shown in Figure 1 .
Figure 1 Temperature and Voltage Sweeps using N5990A Sequencer
As the loop parameters are typically customer-specific, N5990A permits a
list of loop parameters to be specified. N5990A supports the following:
1 Looping over user-specified parameters or run tests with a single
parameter value.
2 Defining a set of loop parameters and for each parameter a range of
test points.