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Instruction Manual A70 Version 6 19th April 2004
BEKA associates Ltd, Old Charlton Road, Hitchin, Hertfordshire. SG5 2DA. UK. Tel: +44 (0) 1462 438301
8.5) Sub Menu Programming
The “Sub-Menu” Programming allows the operator to enter
the variables and functions required.
8.5.1) “root” – Square Root Extractor
. This
function allows the square root linearising function
to be enabled or disabled. This in turn allows the
output from a sensor with an exponential output
signal (e.g. a differential flowmeter) to be displayed
in linear form.
8.5.2) “rESn” - Display Resolution
. This function
selects the resolution of the least significant display
digit. It may be set to 1,2,5 or 10. This function can
be useful if the source signal is noisy. E.g. setting a
display resolution to 5 would mean the display only
increases or decreases in steps of 5 digits, thus
“smoothing” the display.
8.5.3) “dP” - Decimal Point
. This function allows the
decimal point position to be selected.
8.5.4) “hLd”- Max and Min Hold.
Whether this
parameter is set to “On” or “OFF”, the maximum
and minimum display is always being monitored
and stored in the max/min register. In Normal
Display Mode with the parameter set to “On”, the
maximum and minimum can be displayed (by
pressing the up and down buttons) and reset (by
pressing the up and down buttons together). The
maximum and minimum values are lost if there is a
power failure.
8.5.5) “U--P” - Display Units or Percentage
. In
Normal Display Mode, the scroll button can be
programmed to give one of two readings, either the
actual signal input in its own units or the percentage
of span reading. The “units” function will be
incorrect if the internal references have not been
set. See section 8.5.7)
8.5.6) “CAL” - Calibration - internal or external
source
. For a quick calibration, use the “int”
(internal) calibration function. The Advisor allows
the “zero” and “span” readings (display range) to be
entered. The accuracy of this method is dependent
on the accuracy of the internal references set under
the “rEF” menu. (See section 8.5.7). The preferred
calibration method is to use an accurate, traceable
external source. To calibrate using this method,
select “uSEr” followed by “Zero” and apply a “zero”
signal to the input using an external source. Set the
reading desired for this input and press the return
button. The signal input will then be sampled.
Select “SPAn”, set the appropriate input signal and
corresponding reading and sample the input again
by pressing the return button.