When this digit has been adjusted as required,
pressing
(
will transfer control to the next digit.
When all the digits have been adjusted pressing
(
will transfer control to the decimal point that may
be positioned between any of the digits, or may be
omitted by moving it to the right of the least significant
digit. When the required rate scale factor has been
entered, press
)
to return to the
5CALE
.
r
prompt in
the configuration menu.
Note:
Adjustment of
5cale
.
r
will disable the
following ouputs which must be re-enabled
after the adjustment is complete:
Pulse output
Optional Alarm outputs
Optional 4/20mA output
6.19 Timebase:
t-bA5E
The timebase multiplies the rate display by 1, 60 or
3,600 depending upon whether the BA364NG
Counter is required to display rate per second, per
minute or per hour. See Fig 8.
To check or change the timebase, select
t-bA5E
from
the configuration menu and press
(
which will
reveal the current setting. Pressing the
&
or
*
button will scroll through the three options:
tb-1
for pulses / second
tb-60
for pulses / minute
tb-3600
for pulses / hour
When the required multiplier is displayed press
)
to
return to the
t-bA5E
prompt in the configuration
menu.
6.20 Display filter:
FiLtEr
The digital display filter has two independent
adjustable parameters enabling the rate display
response to be tailored for optimum performance.
The filter parameters are controlled by a two digit
number. The first digit defines the amount of filtering
applied to the display as shown below.
First digit
Filter time constant
Seconds
0X
0
1X
1.3
2X
4.3
3X
6.5
4X
8.7
5X
11.3
6X
15.7
7X
20.9
8X
25.2
9X
31.5
The second digit defines the deviation from the
displayed rate at which the filter will be overridden
and the rate display will move rapidly to the new
value.
Second
digit
Magnitude of step
change which will
produce a rapid
response
X0
Off
X1
1%
X2
2%
X3
4%
X4
8%
X5
12%
X6
16%
X7
24%
X8
32%
X9
64%
By careful adjustment of the two parameters a
stable display with an acceptable input step
response can be obtained for most applications.
During commissioning it is recommend that initially
the second digit is set to
0
(off) and the first digit is
adjusted to provide acceptable rate display
stability. The second digit should then be increased
until the selected step size is greater than the
noise on the display signal, at which setting the
rate display will become stable. These will be the
optimum filter parameters for acceptable rate
display stability and a fast response to a large rate
signal change.
To check or change the filter select
FiLtEr
in the
configuration menu and press
(
which will reveal
the current settings with the first digit flashing.
Pressing the
&
or
*
button will adjust the
flashing digit and
(
will transfer control to the
second digit. While making adjustments the
filtered rate display is shown on the lower display
so that stability can be assessed while adjustments
are being made. When set as required, press the
)
button to enter the revised parameters and
return to the
FiLtEr
prompt in the configuration
menu.
24
Summary of Contents for BA364NG
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