BEKA BA304G Manual Download Page 18

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To add a break-point using the

button

select

5Et

from the configuration menu and press

(

which will result in the

Add

sub-function prompt

being displayed. To enter the sub-function press

(

which will reveal the current break-point and

the total number of break-points which have
already been entered. When adding a break-point
the insertion position can be selected using the

and

push buttons followed by

(

push button

to insert the additional break-point. In previously
uncalibrated linearisers each new break-point
should be added in front of the highest existing
break-point, if this sequence is not followed a

FaiL

message will occur when the break-points are
calibrated. See example in section 7.2.1.

The delete a break-point, sub-function

dEL

operates in exactly the same way as the

Add

sub-

function described above. Once within the

dEL

function each time the

(

button is pressed a

break-point is removed. When deleting a break-
point from a calibrated indicator, the break-point to
be deleted can be selected using the

and

push buttons.

The minimum number of break-

points is 2, break-points

and

When the required number of linearising break-
points has been entered, return to the linearisation
sub-menu by pressing

)

The indicator will

display the

Add

dEL

prompt depending upon the

last sub-function used. The indicator input current
and corresponding indicator display at each break-
point, which is the segment finishing point as
shown in Fig 9, can now be entered using the

and

di5P

sub-functions.

Using the

button select

from the sub-

menu and press

(

which will reveal the starting

point for the first segment

0 : n

, where n is the total

number of break-points entered. Press

(

and use

the

and

buttons and the

(

button to move

between digits, to enter the input current in
milliamps at which the first break-point is required,
usually 4.000mA. When set as required, press

)

to return to the

0 : n

prompt from which the next

break-point can be selected using the

and

buttons. When the required break-point has been
selected press

(

and enter the indicator input

current at which this break-point is required using
the

and

buttons and the

(

button to move

between digits. Repeat this procedure until the
indicator input current at all the break-points has
been defined and then return to the

sub-

function by pressing the

)

button.

The corresponding indicator display at each of the
break-points can now be defined using the

di5P

sub-function. Using the

and

buttons select

the

di5P

sub-function and press

(

which will

reveal the starting point for the first break-point

where

is the total number of break-points

entered.

Press

(

and use the

and

buttons and the

(

button to move between digits, to enter the

required indicator display at the first break-point.
When set as required, press

)

to return to the

prompt from which the next break-point can be
selected using the

buttons. When the

required break-point has been selected press

(

and set the required indicator display at this

break-point.

Repeat this procedure until the indicator display at
all the break-points has been defined and then
return to the

5Et

function in the configuration menu

by pressing the

)

button twice.

Error message

If during calibration the indicator displays
a

FAiL

error message the current at which

the selected break-point is being set is not
above the proceding break-point or is not
below the following break-point.

7.2.1

Example
Adding break-points to a new indicator

When adding break-points to a new indicator, or to
a lineariser following resetting to the factory
defaults using the

LtAb

function described in

section 6.11, each additional break-point should be
added before the highest existing breakpoint.
The first additional break-point should be added
before the default break-point

which will result

in a display of

. If more new break-points are

required, using the

button select the new

highest break-point

and add the second

additional break-point by operating the

(

push

button which will result in a display of

. Repeat

the sequence until the required number of break-
points has been entered.

7.3

Under and over-range

The lineariser does not change the under and
over-range indication described in section 6.12. At
input currents below that specified for the first
break-point

, the indicator will continue to use

the specified slope of the first segment.

At input currents above that specified for the last
break-point

, the indicator will continue to use

the slope specified for the last lineariser segment.

7.4

Lineariser default configuration

When the lineariser is reset to the factory defaults
using the

LtAb

function described in section 6.11,

the defaults conditions are:

Indicator display