3. OPERATION
Page
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©2001~2007
DH Instruments, a Fluke Company
3.2.5
[DEV1/2]
PURPOSE
To toggle the active device channel between DEV1 and DEV2.
PRINCIPLE
MFC-CB has two analog device channels designated DEVICE 1 and DEVICE 2 (DEV1
and DEV2) (see Section 3.1.2.4). Both channels are always active in the sense that their
set points are maintained and they continuously measure.
However, one device channel is considered active from the standpoint of various displays
and as the device channel to which a variety of channel specific settings, adjustments
and functions apply. The active device channel is always indicated by the active device
channel indicator at the bottom right hand corner of the display (D1 or D2). An exception
is the DEV1&2 DISPLAY (see Section 3.2.4.1) in which the two channels are displayed
simultaneously, one on each display line, and the active channel is indicated by an arrow
in the far left character of the line.
[DEV1/2]
is used to switch active device channels.
Do not confuse the MFC-CB DEVICE 1 and DEVICE 2 channels with the five (5) channels
available on the optional MFC Switchbox. The MFC Switchbox allows MFC-CB DEVICE 1 or
DEVICE 2 to be directed to one of five continuously powered Switchbox channels (see
Section 3.4.6).
OPERATION
To switch the MFC-CB active channel press
[DEV1/2]
from any run screen.
If an MFC Switchbox is connected and active on MFC-CB DEV1 or DEV2, use [MFC] to
switch channels on the Switchbox (see Sections 3.2.6 and 3.4.6).
3.2.6
[MFC]
PURPOSE
To select the MFC profile for the active MFC-CB device channel. Also specifies the MFC
Switchbox channel to use if an optional MFC Switchbox is connected to the active
MFC-CB device channel (see Section 3.4.6).
PRINCIPLE
MFC-CB is a two channel analog input/output device designed to apply electrical set
points and read back sensor output from mass flow controllers (MFC) and mass flow
meters (MFM). MFC-CB can set and read voltage or current. When it has the necessary
information, it can also convert voltage or current linearly to a flow unit.
Whether MFC-CB operates in voltage or current and how electrical values are converted
to flow values is determined by information contained in an
MFC Profile
. There are two
default MFC profiles, one for voltage (#1) and one for current (#2) that do not specify a
unit of flow. Customized MFC profiles (up to 97 additional) may be created by the user
that specify electrical signal, electrical range, flow unit and flow range (see Section 3.3.1).
