MercuryiTC
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12.2.2
Basic check of board operation........................................................................................... 137
12.2.3
Connecting to the pressure board ...................................................................................... 137
12.2.4
Configuring the pressure board .......................................................................................... 139
12.2.5
Configuring the pressure sensor details ............................................................................. 139
12.3 Using the pressure board to control a pressure .......................................................141
13 GPIB DAUGHTER BOARD ........................................................................................142
13.1 Description of the GPIB daughter board ..................................................................142
13.2 Installing a GPIB board ............................................................................................142
13.2.1
Fitting the board .................................................................................................................. 142
13.2.2
Basic check of board operation........................................................................................... 142
13.3 Connecting to the GPIB board .................................................................................143
14 THEORY OF CONTROL LOOPS ................................................................................144
14.1 General information on control loops .......................................................................144
14.2 General information on temperature control loops ...................................................144
14.2.1
Open loop operation ........................................................................................................... 145
14.2.2
On-Off control...................................................................................................................... 145
14.2.3
Proportional control ............................................................................................................. 146
14.2.4
Proportional control with integral action .............................................................................. 147
14.2.5
Proportional control with integral and derivative action ...................................................... 148
14.2.6
North American terminology ............................................................................................... 149
14.2.7
PID tables ............................................................................................................................ 149
14.3 Theory of gas-flow control .......................................................................................150
14.3.1
Overview of gas control ...................................................................................................... 150
14.3.2
Manual control of the gas flow ............................................................................................ 151
14.3.3
Automatic control of the gas flow ........................................................................................ 151
14.3.4
Heater target tables ............................................................................................................ 152
14.3.5
Siphon algorithm ................................................................................................................. 152
15 PREVENTIVE MAINTENANCE ..................................................................................153
15.1 Cleaning the touch-screen .......................................................................................153
15.2 Calibrating the temperature sensor circuits ..............................................................153
15.3 Lubricating the fan ...................................................................................................153
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