Super Systems DAQ - Manual (Page 25)

Super Systems Inc. Page 25 of 34 DAQ Operations Manual
Zero/Span Calibration
The first step in the calibration process is the zero and span calibration. To select a board to
calibrate, click on the Select button. This will display a drop-down list that the user can select
the board to calibrate. This list will only display the available boards to calibrate. Once a board
is selected, the current values will be displayed along the right of the tab box. Select the input
range from the drop-down list. To perform a zero calibration, select the “Zero” option. To
perform a span calibration, select the “Span” option. The target value for a zero calibration is 0
millivolts. The target value for a span calibration is roughly ninety percent of the range
millivolts. The target value is displayed in the box and can be modified, if desired. If the
millivolt range is not known, the user can click on the help button next to the range drop-down
list. This will display a list of inputs. Selecting the correct input will set the correct millivolt
range.
Checking the check box next to the corresponding input will determine if that input will be
included in the calibration.
NOTE: If the user is using a 10:1 jumper, the user will
need to multiply the source signal by 10 to get the
correct span value . For example, if the 10:1 jumper
is set on a 1.25V range, the suggested source signal
will read 1000 mV. The supplied signal will need to
be 10000 mV to account for the 10:1 jumper.
For a zero calibration, a value of 0 mV will need to be
sourced to the input or inputs.
For a span calibration, a value of 90 % of the full
range will need to be sourced to the input or inputs.
Press the Calibrate button to begin the calibration
process.
Press the Set Nominal button to apply nominal
values to the inputs.