YSI 6500 Environmental Process Monitor - Manual (Page 107)

Advanced Calibration Setup Appendix F
Can override: Yes. This determines whether or not an error message can be overridden if it
occurs during the calibration procedure. Highlight the “Can override: Yes” selection. Press Enter
to toggle back and forth between “Can override: Yes” and “Can override: No”. Select the desired
option. Remember that a calibration error message may indicate a significant malfunction of the
600 Sonde sensor which in turn indicates that service to that sensor is required if accurate
readings are to be obtained. Therefore, it is usually proper to select the “No” option with regard
to this selection. There are occasions when the user is aware that the error message is due to
special circumstances and thus the “Yes” option is appropriate, but these are rare. Generally,
calibration errors should only be overridden after consulting with YSI authorized service
personnel.
Vari from Probe, Vari from Default or Fixed from Default. The software allows you to choose
only one of these three choices. This choice defines the default parameter value which appears on
the 6500 display when the calibration procedure is initiated. During setup choose “Vari from
Probe”. With this selection, the current reading of the parameter will be displayed on calibration
startup and this value can be varied from the 6500 keyboard to reflect the true value. The other
two selections offer the user flexibility for special circumstances.
If “Vari from Default” is selected, then the default value (which can be entered on the final line
of this submenu display) will appear on calibration initiation for this parameter. You might select
this option if you always calibrate specific conductance at approximately 10 mS/cm, and then
“10.0” mS/cm (10,000 uS/cm) will appear on the screen when calibration of this parameter
begins. As with the “Vari from Probe” option, you can modify the value on the screen using the
6500 arrow keys to reflect the true specific conductance. Note, however, that the benefit is
usually slight compared to using the actual sensor reading under “Vari from Probe”.
You would consider choosing “Fixed form Default” if you always calibrate specific conductance
at 10 uS/cm and are certain that this is the true value. In this case 10 mS/cm (10,000 uS/cm) will
appear on the screen for the calibration protocol and you will not be able to change this value
from the 6500 arrow keys.
Default = 1000. The value of the default calibration value for this parameter is only needed if
you choose either the “Vari from Default” or “Fixed from Default” options above. In the
example shown 1000 shows up as the default value. Depending on units, this could represent
1000 uS/cm, for example. If you choose “Vari from Probe”, you need not set a value here.
To view other parameters and set up their associated calibration choices, use the right and left
arrow keys to scroll horizontally between parameters using the scroll bar at the bottom of the
screen (see screen above). Use the descriptions above to set each of the 4 options for these other
parameters.
After configuring your sensor calibrations as described above, press Esc to return to the Main
menu of the 6500 Monitor.
YSI Incorporated 6500 Environmental Process Monitor 104