IPM25 User Manual
19
tedS Parameter
This parameter automatically calibrates the IPM25 with the data from the TEDS chip. The two LEDs appear when
active connection with a TEDS peripheral has been made. When there is a loss of connection these LEDs flash. When
changing a sensor the IPM25 should be power cycled as this is when the TEDS data is read. Calibration Procedures
are not available when TEDS is enabled.
TEDS limitations / specifications
ERROR 1 Must be DS2431 or DS2433 Device
ERROR 2 & 3 Must use template 33
Template 33 restrictions
ERROR 6 min physical value = >-9999999.0
max physical value = >9999999.0
ERROR 4 value precision case = 1 or 2
ERROR 7 min electrical value > -5.0mV/V
max electrical value < 5.0 mV/V
ERROR 5 bridge type = FULL (2)
ERROR 8 excitation min = > 5.0
excitation max = < 5.0
Calibration Procedures
The best method of calibration, if it is possible to do so, is the LiVE calibration, as this reads in the sensor signal at
two calibration points and scales the IPM25 automatically. If this is not possible, then the sensitivity figure (in mV/V)
from the sensor calibration certificate can be used to scale the IPM25, by using the tAbLE calibration. This may be the
only option available if you are unable to apply a known stimulus to the sensor, which quite often is the case.
LiVE Calibration Procedure (you must apply the load on the system)
When CALibrAt is displayed press
LiVE ? will now be displayed, press
You will be prompted uSE SC ?, this can be selected if you wish to use the shunt calibration figure from a sensor
calibration certificate (care should be taken that the shunt calibration resistor used originally with the sensor is the
same as is fitted in the IPM25). If you wish to use this press
otherwise press
You will then be prompted APPLY LO. At this point ensure that the low calibration stimulus is applied to the sensor
and allow to settle of approx. 3 seconds, then press
You then be prompted with dISP LO. Press to enter the display value required with the low stimulus applied to the
sensor. The value can be entered by using the
and button to select a digit and the and buttons to
change the digit. When the value has been set press
You will then be prompted with APPLY HI (unless you chose to uSE SC ?, in which case jump to the next stage) At
this point ensure that the high calibration stimulus is applied to the sensor and allow to settle of approx. 3 seconds,
then press
You then be prompted with dISP HI. Press to enter the display value required with the high stimulus applied to the
sensor. The value can be entered by using the
and button to select a digit and the and buttons to
change the digit. When the value has been set press
You should now see donE displayed. This means the calibration was successful, press to the IPM25 to normal
operation mode, with the new calibration data stored. If you see FaiLEd, then you will need to repeat the calibration,
checking that you have completed the procedure in the correct order, and that the sensor is connected correctly.
tAbLE Theorical Calibration Procedure (sensor parameters)
When CALibrAt is displayed press
LiVE ? will now be displayed, press
tAbLE ? will now be displayed, press
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