Each vessel needs to be calibrated. Although the vessels are CNC machined and very similar they are not exactly the same in electrical and thermal behaviour.
Therefore each vessel must be calibrated in the CAL3K it is used in. The Vessel stores the calibration details; it has seven places to do it in.
The storage in the vessel is organized in:
- Chassis/Card number
- Operating mode
This means that you can have an unlimited amount of vessels, but only 7 CAL3K operating in one mode in one room. If you have multiple CAL3K’s in a room and don’t want to share the vessels between them then there is no need to calibrate each vessel in each calorimeter.
See: LINKING VESSELS TO A CHASSIS for details.
For further details see:
The CAL3K has the following calibration procedures:
CALIBRATION: Affects the bomb factor with the average and saves the data
INTELCAL: Uses the saved calibration data and computes a SYSTEM calibration
How to start a calibration
|Start of command|
After a calibration the following items are stored in the vessel in the specified field:
- Calibration chassis number
- Date and time
- Initial drift
- Firing temperature behaviour
- Bomb Factor
The vessels are calibrated in the factory before shipment. However, a change in operating conditions and for quality assurance of the results, the calibration should be repeated regular. For details see:
The Keyboard calibration affects the already loaded ‘Bomb factor’ only. A AVERAGE bomb factor is calculated (Average Calibration > 0) with the available older calibrations and saved to the bomb for future determinations.
The ‘IntelCal’ calibration requires a PC, which will upload all old calibrations, and calculate from it the best way to compensate bomb behaviour for your installation. In the absence of a ‘IntelCal’ compensation data set the CAL3K uses a DEFAULT IntelCal, which was computed from multiple vessels under normal operating conditions.
The DEFAULT INTELCAL is normally sufficient for standard operations.
A check sample or keyboard calibration should be done every day, depending on the use and repeatability required.