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4.8
CALIBRATION EXAMPLE
A BA368C is required to display the speed of a
rotating shaft in revolutions per minute with a
resolution of 1rpm. The speed sensor is a
magnetic pick-off that produces four voltage pulses
per revolution. A run-time display is required,
which is to operate when the speed exceeds 5rpm
and is to be resettable from the BA368C front
panel. To prevent tampering the instrument
programme menu is to be protected by security
code 1209
The BA368C may be calibrated on-site without
disconnection from the power supply or from the
magnetic pick-off.
Step 1
Enter the programming mode
Put the BA368C 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
‘FunctIon’ which is the first parameter in
the main menu. See Fig 4.3
Step 2
Select the instrument function
With ‘FunctIon’ displayed, press
P
to
reveal the existing instrument function.
If this is not ‘tACHO’, select ‘tACHO’
using the
Up
or
Down
button. To
prevent accidental changes the new
setting will only be executed after the
pass word ‘SurE’ has been entered.
Press
P
which will produce a display of
‘Set nO’ with the ‘nO’ flashing. Using
the
uP
or
Down
button change ‘nO’ to
‘YES’ and press
P
again which will
result in a display of ‘0000’. Using the
Up
or
Down
button to adjust each digit
and the
P
push-button to transfer
control to the next digit, enter the pass
word SurE.
Note:
S is entered as 5.
Finally, press
E
which will execute the
function change and return the
instrument to the ‘FunctIon’ prompt in
the main menu.
Step 3
Select the type of input
Using the
Up
or
Down
button scroll
through the main menu until ‘InPut’ is
displayed; press
P
to reveal the existing
setting. Using the
Up
or
Down
buttons
select ‘COIL’, the input for a magnetic
pick-off, and then return to the 'InPut'
prompt in the main menu by pressing
E
.
Step 4
Position of decimal point
In this example the BA368C is
displaying rotary speed and no display
decimal point is required. Select ‘d.P.’
from the main menu and press
P
. The
display will be activated with one digit
plus the following decimal point
flashing. Press the
Up
or
Down
button
until the least significant digit (right
hand digit) is flashing which will result
in no decimal point being displayed.
Finally press
E
to return to the 'd.P’.
prompt in the main menu.
Step 5
Enter the rotational scaling factor
In this example the magnetic pick-off
produces four voltage pulses per
revolution, the instrument rotational
scaling factor must therefore be set to
4.0
Select ‘r SCALE’ from the main menu
and press
P
which will show the current
figure with one digit flashing. To
position the decimal point, operate the
P
push-button to move the flashing digit
to the second least significant digit.
Pressing the
Up
and
Down
buttons
simultaneously will then fix the decimal
point in front of the least significant
digit.
Using the
Up
and
Down
buttons to
adjust each digit in turn and the
P
button to transfer control between
digits, enter 4.0 Finally return to the 'r
SCALE' prompt in the main menu by
pressing
E
.
Step 6
Set the display timebase
Select ‘t-bASE’ from the main menu
and press
P
to show the current setting.
In this example rotary speed is required
in revolutions per minute. Using the
Up
or
Down
button scroll through the three
options and select ‘tb-60’ which will
multiply the rate display by 60 to
provide a display in revolutions per
minute (rpm). Return to the ‘t-bASE’
prompt in the main menu by pressing
E
.
Содержание BA368C
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