8
Display Description of function
'FrE'
Frequency rejection
Defines the mains (line) frequency at
which the indicator has maximum ac
rejection. 50 or 60Hz may be selected.
This function must be set before the
instrument is calibrated as it effects the
indicator display.
See section 5.10.1
'rEF'
Calibration of internal
references
The indicator contains two references
representing 4 and 20mA.
These
internal references are used when the
indicator display is calibrated without
an external current calibrator, and
when the input current is displayed in
milliamps. See the SEt and C--P
functions. If either of these functions is
to be used, the internal references
should be periodically calibrated.
See section 5.10.2
'C - - P' Function of
P
push-button
The BA526C digital indicator may be
programmed to display the input
current in milliamps or the input current
as a percentage of the displayed span
when the
P
push-button is operated.
See section 5.11
'null'
Null display function
When
activated
the
null
function
enables both displays to be zeroed at
any input current to produce a deviation
display.
See section 5.12
'COdE' Security code
Defines a four digit numeric code which
must be entered to gain access to
programmable functions. Default code
0000 disables the security function and
allows
unrestricted
access
to
all
programmable functions.
See
section 5.13
5.2
Root extractor: root
This function is primarily intended for use with
differential flowmeters which have a square law
output.
The root extractor linearises the input
current between 4.04mA and 20mA (5 to 100%
flow) so that the flow signal is displayed in linear
units.
For inputs below 4.04mA the BA526C
displays zero. To activate the square root extractor
select 'root' from the menu and press
P
which will
reveal if the function is 'On' or 'OFF'.
If the
function is set as required, press
E
to return to the
menu, or press the
Up
or
Down
button to change
the setting, followed by the
E
button to return to the
main menu.
For reference, the following table shows the output
current from a non-linearised differential flowmeter.
% of full flow Current output mA
5.0
4.04
10.0
4.16
25.0
5.00
50.0
8.00
75.0
13.00
100.0
20.00
5.3
Digital display: dSPL
When only an analogue display is required or
when the instrument is mounted horizontally the
digital display may be disabled. To change the
status of the digital display select 'dSPL' from the
main menu and press
P
which will show if the
digital display is 'On' or 'OFF'. If set as required,
press
E
to return to the menu, or press the
Up
or
Down
button to change the setting, followed by the
E
button to return to the main menu.
5.4
Display resolution: rESn
This function defines the resolution of the display
digit but does not effect the bargraph. Decreasing
the display resolution can improve the readability
of a noisy signal. Select 'rESn' from the menu and
press
P
which will reveal the current display
resolution. To change the resolution press the
Up
or
Down
button to select 1, 2, 5 or 10 digits. When
the required resolution is shown press
E
to return
to the main menu.
Summary of Contents for BA526C
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