Characterizing Power-up and Power-down Transients Using the Model DMM7510 7½-Digit Graphical Sampling Multimeter –– APPLICATION NOTE
Characterizing Power-up and Power-down Transients Using the Model DMM7510 7½-Digit Graphical Sampling Multimeter Introduction Switch-Mode Power Supply Most electronic systems contain analog circuits, microprocessors, DSPs, ASICs, and/or FPGAs, which require multiple supply voltages.
4. Set the Sample Rate to 1,000,000. 5. Press the MENU key. 6. Select Reading Buffers. 7. Set the Capacity to 10,000 for 10ms of readings. 8. Press the MENU key. 9. Select Graph. 10. Select the Scale tab. 11. Set the X-Axis Method to All. 12. Select the Trigger tab. 13. Set Source Event to Waveform. 14. Select Analog Edge. 15. Set Level to 3 V. 16. Set Position to 50% for the pre-trigger position. 17. Select the Graph tab to view the graph. 18.
in the design. You can easily zoom and pan to any area on the waveform to examine the details of these individual occurrences. You can also enable horizontal and vertical cursors for further analysis. See the Appendix for programming examples on analog edge trigger. Figure 4a. A complete capture of buck converter power-up with softstart sequence.
Figure 6a. Individual waveform display of simultaneous input current and output voltage measurement. Figure 6b. Combining input current and output voltage onto a single display. Figure 6c. Zooming. waveforms to examine the dynamic behaviors in detail. For more information and support on TSP programming and simultaneous measurement, refer to the Reference Manual for the Model DMM7510 or the Keithley website (www.keithley.com).
Figure 6d. Reading tables for input current and output voltage. Conclusion The Model DMM7510 7½-Digit Graphical Sampling Multimeter broadens the utility of a traditional DMM toapplications such as capturing a wide range of dynamic voltage and current signals on power supplies. You can view, analyze and interact directly with waveforms right on the front panel display. It is compact, simple to set up, and the perfect next-generation bench instrument for research and development.
Setting Up the Voltage Power-up Measurement Using TSP Commands The following TSP script is designed to be run from Keithley Instruments’ Test Script Builder (TSB) software, a free software tool that can be downloaded from the website (ww.keithley.com). By default, the Model DMM7510 is configured to use the SCPI command set, so before sending TSP commands to the instruments, the TSP command set must be selected instead. Perform these steps to change the command set: Press MENU -> Settings -> Command Set.
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