19
6.2 Calibration example
Using the internal references
In this example the internal references within the
BA554D 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 6.1 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 BA554D 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 6.1
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 enter this calibration
figure. The instrument will display
‘Ent’ for a few seconds before
returning 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
Press
E
to enter this calibration
figure. The instrument will display
‘Ent’ for a few seconds before
returning to the 'SPAn' prompt.
Steps
Perform as described in previous
9 to 14
calibration example in section 6.1
