Nonfiction 1

Column Handbook for Size Exclusion Chromatogrаphy by Wu PDF

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Modeled after a kitchen oven, I wanted the controller to have a knob for setting the desired temperature. A temperature probe would monitor the ceramic cooker’s actual temperature, and the controller would adjust the airflow to keep the desired and actual temperatures as close as possible. a) V+ D G Enable S MOSFET switch V+ V+ VOUT VOUT b) V+ D G V+ G V+ VOUT VOUT Figure 1a—With no thermocouple connected, a test voltage applied to the op-amp produces a maximum output voltage. b—The low impedance of a connected thermocouple drastically reduces the test voltage, producing a much lower output voltage.

The integral portion of the calculation is based on the sum of all the previous error values; it’s a measure of any longer-term error trend. The derivative part of the calculation is based on the change in the error, not the temperature, and it measures how quickly the error is changing. Each of the three components can be given a different weighting factor. If the weighting factors are chosen correctly—through a process called “tuning”— the PID algorithm will adjust the fan speed to bring the actual temperature to the desired temperature with no overshoot, and it will maintain that temperature with little or no oscillation even if conditions change.

Or you could choose to mount nothing on the cooker itself and pipe the air to the cooker through a metal pipe or flex tubing. CONTROLLER SOFTWARE The software was written with the ImageCraft ICCAVR C compiler. Approximately half of the 8 KB of flash memory has been used so far. The ATmega8’s flash memory is incircuit programmed through an Atmel standard ISP header. The ImageCraft IDE provides a programmer. In addition, stand-alone programming software is widely available on the Internet. ImageCraft also offers a free 30-day unrestricted trial period for its IDE and compiler.

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