Measurement Specialties USB-1616HS-2 manual Using the hysteresis function

USB-1616HS-2 User's Guide Functional Details

Figure 27. Timer output update on True and False

Using the hysteresis function

Update mode: N/A, the hysteresis option has a forced update built into the function

Criteria used: Window criteria for above and below the set limits

Figure 28 shows analog input Channel 3 with a setpoint which defines two 16-bit limits, Limit A (High) and Limit B (Low). These are being applied in the hysteresis mode and DAC channel 0 is updated accordingly.

In this example, Channel 3's analog input voltage is being used to update DAC0 as follows:

ƒWhen outside the window, low (below limit B) DAC0 is updated with 3.0 V. This update remains in effect until the analog input voltage goes above Limit A.

ƒWhen outside the window, high (above limit A), DAC0 is updated with 7.0 V. This update remains in effect until the analog input signal falls below limit B. At that time we are again outside the limit "low" and the update process repeats itself.

Hysteresis mode can also be done with FIRSTPORTC digital output port, or a timer output, instead of a DAC.

Figure 28. Channel 3 in hysteresis mode

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