BEKA BA678C, Руководство пользователя, Страница: 19 / 27

Step 6 Configuration of 4/20mA output
See: Fig 6 and section 6.2.7
The BA678C transmitter digital display
at which the transmitter output current is
4mA and 20mA is defined by the ‘CAL’
function
which contains two sub-
functions.
Using the
▼ or ▲ button select ‘CAL’
from the configuration menu and press
P which will show the ‘ZEro’ sub-function
prompt. Press P again to enter this sub-
function, which will reveal the existing
digital display at which the transmitter
output current is 4mA.
Adjust the
display to the required –0010.0 using
the
▼ or ▲ button to adjust the flashing
digit and the P button to move control to
the next digit. A negative display is
achieved by scrolling the most
significant digit below zero using the ▼
button. When set press E to enter the
new value and return to the ‘ZEro’ sub-
function prompt from which the ‘SPAn’
sub-function, which defines the display
at which the output is 20mA, may be
selected using the
▼ or ▲ button.
Press P to enter this sub-function, which
will reveal the existing digital display at
which the transmitter output current is
20mA.
Adjust the display to 0250.0
using the ▼ or ▲ button to adjust the
flashing digit and the P button to move
control to the next digit.
Finally press
E twice, first to enter the
selection and return to the ‘SPAn’ sub-
function prompt, and again to return to
the ‘CAL’ function prompt in the
configuration menu.
Step 7 Configuration of bargraph display
See: Fig 6 and section 6.2.8
This
function contains three sub-
functions that justify the bargraph
display and define the transmitter digital
display at which the bargraph starts and
finishes.
Using the ▼ or ▲ button select ‘bAr’
from the configuration menu and press
P which will show the ‘b.tYPE’ sub-
function prompt. Press P again to enter
this sub-function, which will reveal the
existing bargraph justification. Using the
▼ or ▲ button scroll through the options
and select ‘LEFt’ which will start the
bargraph on the left hand side of the
display. Press
E to enter the selection
and return to the ‘b.tYPE’ sub-function
prompt from which, using the
▼ or ▲
button, the ‘bArLo’ sub-function may be
selected. Press
P to enter the ‘bArLo’
sub-function which will reveal the
existing digital display at which the
bargraph starts.
Set the display to
0100.0 using the ▼ or ▲ button to
adjust the flashing digit and the P button
to move control to the next digit. When
set, press
E to enter the new value and
return to the ‘bArLo’ sub-function prompt
from which the ‘bArHi’ sub-function may
be selected.
Press P to enter the
‘bArHi’ sub-function which will reveal the
existing digital display at which the
bargraph finishes.
Set the display to
0200.0 using the ▼ or ▲ button to
adjust the flashing digit and the P button
to move control to the next digit.
Finally press
E twice, first to enter the
selection and return to the ‘bArHi’ sub-
function prompt, and again to return to
the
‘bAr’ function prompt in the
configuration menu.
Step 8 Enter the configuration
menu access code.
See Fig 6 and section 6.2.9
This function defines the four digit code
that must be entered to obtain access to
the BA678C transmitter’s configuration
menu.
Using the
▼ or ▲ button select the
‘CodE’ prompt from the configuration
menu and press
P which, for a new
instrument, will show the default code
‘0000’ with the first digit flashing. Using
the
▼ or ▲ button to adjust the flashing
digit and the P button to transfer control
to the next digit, set the display to 1209.
Press
E twice to enter the new access
code and return the BA678C to the
display mode via the ‘CodE prompt.
This completes the instrument
configuration. The BA678C transmitter
will now function as specified at the
beginning of this example. Access to
the configuration is protected by code
1209 which must be entered each time a
change is made.
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