DH Instruments COMPASS FOR MOLBOX, User Manual

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COMPASS

for molbox™ User’s Manual
© 1998-2003 DH Instruments, Inc .
Page 38
6.6.8 FLOW CONTROL
The flow control function is represented by the toolbar icon:
If a non-manual flow control option is specified in [Run DUT] mode or the reference molbox
has the MFC control option in [Run molbox] mode, this function is enabled to control the
flow or molbox output. In [Run DUT] mode, the flow can be changed by directly entering the
target flow, scrolling to the desired target flow, using the jog function or activating one of the
flow regulation modes. When the target flow is changed, an
<Activate Change> button
appears for final confirmation prior to taking action. The <DUT> run screen will display the
resulting new set point when the target is accepted (see Section 6.7.3). Realize that the
target flow value is set in the target flow unit of measure. If these units are changed,
COMPASS converts the current target flow value to the new unit.
The [Tools], [Options], [Run Test] tab contains the overshoot tolerance that limits the
actual minimum and maximum set points based on the DUT’s range (see Section 11.6). To set
flows significantly above the DUT’s defined range, this value must be increased while
COMPASS is idle.
In [Run molbox] mode, there is no DUT information available to define the relationship
between analog output and flow. As a result, flow regulation and jog functions are not available.
The target flow field allows set points in volts and/or mA only based on the reference molbox.
Table 7 provides information on each of the flow control panel fields.
Press the <Activate Change> button to accept a new target flow value.
Figure 18. <Flow Control> Panel