11
5.4 Position of the decimal point: ‘dP’
A dummy decimal point can be positioned between
any of the digits or it may be absent. To position
the decimal point select 'dP' from the menu and
press
P
. The decimal point can be moved by
pressing the
▲
or
▼
push-button. If a decimal
point is not required it should be positioned beyond
the most or least significant digit. When
positioned as required press the
E
button to enter
the selection and return to the configuration menu.
5.5 Calibration using an external
current source: ‘CAL’
This function enables the zero and span of the
indicator to be adjusted using an external
calibrated current source. When used with an
accurate traceable current source this is the
preferred method of calibration.
Zero is the indicator display with 4mA input
Span is the indicator display with 20mA input
To calibrate the indicator select 'CAL' from the
configuration menu and press
P
.
The indicator will
display 'ZEro' which is a request for a 4mA input
current. Adjust the external current calibrator to
4.000mA and again press
P
which will reveal the
current zero display. The flashing digit of the
indicator display can be changed by pressing the
▲
or
▼
buttons, when set as required pressing
P
will transfer control to the next digit. When all the
digits have been adjusted, press
E
to enter the
new zero and return to the 'ZEro' prompt .
Pressing the
▲
button will cause the indicator to
display 'SPAn' which is a request for a 20mA input
current. Adjust the external current calibrator to
20.000mA and again press
P
which will reveal the
existing span display. The flashing digit of the
indicator display can be changed by pressing the
▲
or
▼
buttons, when set s required pressing
P
will transfer control to the next digit. When all the
digits have been adjusted press
E
t
o enter the new
span and return to the 'SPAn' prompt. Finally
press
E
again to return to the configuration menu.
Notes:
a. The indicator input current must be adjusted to
the required value before the zero and span
functions are entered by pressing the
P
button.
b. Indicators may be calibrated at currents other
than 4 and 20mA, withiin the range 3.8 to
21.0mA providing the difference between the
two currents is greater than 4mA. If these
conditions are not complied with, the indicator
displays ‘FaiL’ and aborts the calibration.
c. If the zero current is greater than the span
current the instrument will be reverse acting i.e.
an increasing input current will cause the
display to decrease.
5.6 Calibration using internal reference: ‘SEt’
Using the ‘SEt’ function the indicator can be
calibrated without the need for an accurate
external current source and without the need to
disconnect the indicator from the 4/20mA
measuring loop.
The indicator’s internal reference is used to
simulate a 4mA and 20mA input current, so the
actual indicator input input current does not have
to be known during calibration.
Zero is the display with a simulated 4mA input
Span is the idisplay with a simulated 20mA input
To calibrate the indicator display select 'SEt' from
the configuration menu and press
P
.
The indicator
will display 'ZEro', pressing
P
again will reveal the
current display at 4mA. The flashing digit can be
adjusted by pressing the
▲
or
▼
buttons, when
the flashing digit is correct pressing
P
will transfer
control to the next digit. When all the digits have
been adjusted, press
E
to return to the 'ZEro'
prompt.
To adjust the display at 20mA, press the
▲
button
which will cause the indicator to display 'SPAn',
pressing
P
will then reveal the indicator’s exisitng
display at 20mA. The flashing digit can be
adjusted by pressing the
▲
or
▼
buttons, when
the flashing digit is correct pressing
P
will transfer
control to the next digit. When all the digits have
been adjusted press
E
t
o return to the 'SPAn'
prompt followed by
E
to return to the ‘SEt’ prompt
in the configuration menu.
5.7 Bargraph format and calibration: ‘bAr’
Only BA527E & BA528E have a bargraph
In addition to a five digit numerical display the
BA527E and BA528E indicators have a 31
segment analogue bargraph which may be
configured to start and finish anywhere within the
indicators numerical display range.
To configure the bargraph select 'bAr' from the
configuration menu and press
P
.
The indicator will
display 'tYPE', pressing
P
again will reveal the
existing bargraph justification which can be
changed to one of the following four or five options
using the
▲
or
▼
button:
Bargraph starts from
‘LEFt’
Left end of display
‘CEntr’
Centre of display
‘riGHT’
Right end of display
‘AlrSP’
Only with alarms – see section 8.3.14
‘oFF’
Bargraph disabled
When set as required press
E
to return to the
‘tYPE’ sub-function prompt.
