22
Step 13 Set the security code
Defining a security code prevents
unauthorised access to the programme
functions. Select 'COdE' from the
main menu and press
P
which will
reveal the existing security code. Using
the
Up
and
Down
buttons enter the new
code 1209 digit by digit. The
P
button
will transfer control between digits.
When the new code has been entered,
press
E
to return to the main
programme menu.
Step 14 Return to the operating mode
Following completion of programming
and calibration, return the instrument to
the operating mode by pressing
E
. All
the BA354D programming functions will
now be stored in permanent memory
and protected from accidental
adjustment by the security code.
7.2
Calibration example
Using the internal references
In this example the internal references within the
BA354D are used to calibrate the rate display.
Except for steps 1, 2 and 8 the procedure is
identical to that in the previous example in section
7.1 The advantages of using the internal
references are that the instrument does not have
to be disconnected from the measurement loop
and no calibration equipment is required.
Steps 1&2 Enter the programming mode
The BA354D may be recalibrated
without disconnection from the
4/20mA measurement loop. With any
input current between 4 and 20mA
put the instrument in the
programming mode by
simultaneously pressing
P
and
E.
Assuming a security code has not
already been entered the instrument
will respond by displaying 'root' which
is the first function in the main menu.
Steps
Perform as described in previous
3 to 7
calibration example in section 7.1
Step 8
Calibrate the rate display
Scroll through the main menu until
'SEt' is displayed. Press
P
and the
instrument will display 'ZErO',
pressing
P
will reveal the existing rate
display at 4mA. Using the
Up
,
Down
and
P
push-buttons enter the
required zero display of 0.0 Press
E,
to return to the 'ZErO' prompt.
Press
the Up
push-button
and the
instrument will display 'SPAn'.
Pressing
P
again will reveal the
existing display at 20mA. Using the
Up
,
Down
and
P
push-buttons enter
the required display of 1100
Steps
As previous calibration example
9 to 14
in section 7.1
