Calibration Functions; View/Enter Calibration Coefficients; Calibration History - RBR 1050 Series User Manual

Calibration functions

View/Enter Calibration Coefficients

The View/Enter Calibration
Coefficients option in the
'Calibration Functions' drop-down
menu allows one to modify the
calibration coefficients for each
sensor. The Set calibration button
writes these coefficients into the
logger memory.
Every time the logger is calibrated,
the calibration coefficients are written
to a portion of the logger memory
that cannot be erased. Thus, the logger can be re-calibrated a finite number of
times. However, the amount of memory reserved for this information is
sufficiently large that it is unlikely that it will be filled during the lifetime of the
instrument.
The maximum number of calibrations can be determined using the following
formula, where N is the number of sensors in the logger configuration:
Number of calibrations = 65435 / (6 + (33 x N))
Therefore, a single channel logger can be calibrated 1,677 times. A logger with 4
channels can be calibrated as many as 474 times. A thermistor string with 24
nodes can be calibrated up to 81 times.
In the unlikely event that the calibration limit is exceeded, the logger can be
returned to RBR for servicing.

Calibration History

Should the user wish to know what calibration coefficients have been used and
when they have been set, the Calibration History menu item displays a dialog
box with this information. A file with a filename consisting of the logger serial
number and a ".his" extension is automatically written to the program directory
(e.g. "C:\Program Files\RBR\08910.001.his").
Note: The conductivity, temperature and depth sensors have all been
calibrated to a very high degree of accuracy, traceable to NIST
standards. We strongly recommend that you consult RBR before
changing any of the calibration coefficients.
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