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Beam Current Integrator
a. The digital display reads out the total integrated charge in Coulombs * Multiplier (including the decimal point). The pre-scaler value (h) is automatically included in the display by moving the decimal point in the display readout. For example, if the digital display reads 1234.56 and the range is 10^-6 the charge is 1234.56 uC.
d. This switch is used to expand the full scale indication of the beam current on the meter only. It has no effect on the total integrated charge value.
e. This switch selects the polarity of the input current.
f. The integrate light is on when the Beam Current Integrator is enabled. It is controlled by the Integrate switch (g.) and also by the Integrate Control input found on the panel above the Beam Current Integrator. The external input is +5 = integrate enable, 0 = integrate disable. External control is on if no cable is connected. The front panel switch dominates and must be “on” to allow external control.
i. The Preset Charge switches set the total charge amount that will stop the integration and turn off the integrate control light when the digits match the digits in the display AND the Preset Charge (w.) switch is in the Enable position. If the Preset Charge switch is in Disable position, the integration will not stop and when the 6 digits reach 999999 it will wrap around to 0 and continue. There are 2 BNC connectors that reflect the state of the Integrate Control light located above the Beam Current Integrator. These are labeled Integrate Control Output and are +5 volts when integrating and 0 volts when not integrating (f. is not illuminated).
w. Preset Charge (Enable Disable). This switch will allow stopping the integration and providing a control output level (Integrate Control Output) when the integrated charge display matches the digits in the 6 thumbwheel Preset (i.) switches when in the Enable position. When in the Disable position, integration will not stop if the switches match and the digital diaplay will wrap around from 999999 to 000000.
— Don Carter 2012/03/21 10:56