BEKA BA527C, Manual

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5.1 Summary of programmable functions
This section summarises each of the main
programmable functions and includes cross
references to more detailed information. Fig 6
illustrates the location of each function within the
menu.
Display Description of function
'root' Square root extractor
Turns the square root extractor for
linearising the output from differential
flowmeters on or off. This function is
omitted when a lineariser is installed.
See section 5.2
'rESn' Display resolution
Selects the resolution of the least
significant display digit. May be set to
1, 2, 5 or 10 digits.
See section 5.3
'd.P.' Decimal point
Positions the dummy decimal point
between any of the digits or turns it
off.
See section 5.4
'CAL' Calibration of display using the
external current source.
Enables the zero and span of the
indicator to be adjusted using an
external current source such as a
calibrator. Also enables a complete
loop to be calibrated from primary
element to the indicator display.
When used with an accurate traceable
current source this is the preferred
method of calibration.
See section 5.5
'SEt' Calibration of display using internal
references.
Enables the zero and span of the
indicator to be adjusted without the
need for an accurate input current or
disconnection from the 4/20mA loop.
See section 5.6
Display Description of function
'Cond' Indicator conditioning
This function provides access to a
sub-menu enabling the internal
references to be calibrated, and the
mains (line) frequency rejection to be
selected. Because these parameters
will alter the indicator display, they are
contained in a sub-menu to prevent
inadvertent adjustment.
See section 5.7
'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 5.7.1
'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 5.7.2
'C - - P' Function of P push-button
The P push-button may be
programmed to display the input
current in milliamps or the input
current as a percentage of the
displayed span.
See section 5.8
'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 5.9