9
Summary of Programmable Functions
Display
Description of function
'root'
Square root extractor
Turns the square root extractor for
linearising
the
output
from
differential flowmeters 'On' or 'OFF'.
See section 6.2
'dSPL'
Digital display
Turns the 4½ digit display 'On' or
'OFF'.
See section 6.3
'rESn'
Display resolution & dummy zero
Selects the resolution of the least
significant display digit. May be set
to 1, 2, 5 or 10 digits.
See section 6.4
'dZErO' Dummy trailing zero
Activates a dummy zero after the
4½ digit display so that larger
number may be displayed.
See section 6.5
'd.P.'
Decimal point
Positions a dummy decimal point
between any of the digits or turns it
off.
See section 6.6
'bAr'
Bargraph display
Selects a column or single segment
display, and defines whether the
input current is displayed on the left
hand or on both 100 segment
bargraphs. See section 6.7
'CAL'
Calibration of displays using
external current source.
Enables the zero and span of the
digital indicator to be adjusted
using an external current source
such as a calibrator. The analogue
bargraph is linked to the digital
display
and
is
automatically
calibrated at the same time.
When performed with an accurate
traceable current source, this is the
preferred method of calibration.
See section 6.8
Display Description of function
'SEt'
Calibration
of
display
using
internal references.
Enables the zero and span of the
digital indicator to be adjusted
without the need for an accurate
input current or disconnection from
the 4/20mA loop.
The analogue
bargraph is linked to the digital
display
and
is
automatically
calibrated at the same time.
See section 6.9
'Cond'
Indicator conditioning
This function provides access to a
password
protected
sub-menu
enabling the internal references to
be calibrated, and the mains (line)
frequency rejection to be selected.
See section 6.10
CAUTION
Do not attempt to change
the frequency of the mains
(line) filter frequency or
recalibrate
the
internal
references without reading
section 6.10 of this manual
'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 affects the
indicator display.
See section 6.10.1
'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 6.10.2
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