21
7.2 Calibration example
Using the internal references
In this example the internal references within the
BA354ND 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 BA354ND may be recalibrated
without disconnection from the
4/20mA measurement loop. With an
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
Perform as described in previous
9 to 14
calibration example in section 7.1
