Flyers
DC evaluation of MEMS accelerometers
Measurement examples
A Source/Measure Unit (SMU) is a convenient way to measure supply current characteristics by sweeping the supply voltage across its specifications. In this example the supply current increases as the supply voltage varies from 1.8 V to 3.6 V. If needed, each measured result can be displayed in a sub-window popped up in the graphical display.
Using the B2900A series’ time sampling capability and superior graphical user interface, time domain DC measurements (such as V-t or I-t) can be made with the same precision as regular I-V measurements. In this example the DUT was slowly and manually rotated by 360° under the force of gravity so that XOUT varied from 1.23 V to 1.84 V in response to the direction of gravity to the 3-axis sensor. The B2912A’s aperture time was set to 10 PLC (200 ms) to take in to account the DUT’s fixed filter response and its speed of manual rotation. While this measurement could also be done using an oscilloscope, the B 2900A offers convenience, low-cost and a small footprint. In addition, unlike a scope the B2900A can also perform precision I-V measurements and precision time domain DC measurements.
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