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Control
Function
Temperature tickbox and radio
buttons
Select at which temperature point the unit is currently been calibrated
Applied Pressure
The engineering units pressure setpoints - user entered, or set to standard values (+/-
FS, +/-0.5FS, 0) by clicking 'Defaults'
Pressure (16 bit FS)
The 16 bit unsigned representation of the pressure setpoints, calculated by the
software
Read value (16 bit FS)
The raw value read by microDAQ from the pressure scanner for the pressure setpoint
Temperature (16 bit FS)
The temperature value read by microDAQ from the pressure scanner at that pressure
setpoint
‘Accept’ button
Clicking 'Accept' stores the current read value as the calibration point, and moves on
to the following setpoint
‘Defaults’ button
Sets the default calibration points as +/- full scale, +/- 0.5 full scale and zero
Calculate
Takes the acquired data and calculates the derived calibration coefficients - will not
proceed unless there is no more than one zero in the applied pressure text boxes
Clear
Clear the current calibration test data to zeroes, also clears the calibration controls
Temperature Cal.
When checked enables temperature options 2 and 3 for a 3 temperature calibration.
Unchecked only temperature point 1 is available to the user and the system will
calculate coefficients for a non temperature calibration
Live Values
The live values of the current channel are displayed here
Live update on/off
Selects whether the live values will update at a 1 second interval or not.
View channel
Select the channel that supplies the values displayed in the calibration controls
C0 – C8
Calibration coefficients read/calculated for the selected channel
Burn Coeffs
Tell the microDAQ to store the current coefficients to non-volatile storage (EEPROM)
Linear Cal Functions
‘Set Span’
Set the span of a linear calibration – confirms the value of pressure that has been set
up as the span value is being applied to the sensor.
‘Reset Linear Cal.’
Resets the linear calibration to (+ 0) x1 i.e. no offset, unity gain. Applies ONLY to the
current linear calibration, ie the DTC calibration if using a DTC scanner.
Calibration Load/Save
Browse
Allows the user to search through the file directory system and select a calibration file
Save File
Save the current local calibration coefficients to a file - defaults to the calibration file
directory
Read File
Reads the calibration file selected by the browse function into the microDAQ (note:
Reading a non calibration file will cause the system to crash)
Table 5.6, Calibration Page controls
