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Chapter 4 The Readings Process
This chapter gives an account of the reading process except for the linearity-and temperature-compensation
processes (which have their own chapters later on).
Flow diagram
Electrical
MMV
MMV/NMVV x 100%
ELEC
*OPTIONAL MODULE
* TEMP
The underlying analogue to digital conversion rate is 3.255Khz. These results are block averaged to produce the
required output rate set by the RATE control This block averaged result is then passed through the dynamic filter at
the same rate and then into the 'chain' of above calculations.
The named values shown in the boxes are all output parameters, which can be read back over the comms link.
The diagram shows three separate calibration stages, called the 'Electrical', 'Cell' and 'System'.
This allows independent calibrations to be stored for the device itself, the load cell and the installed system
characteristics –
Electrical
The 'Electrical' calibration produces corrected electrical readings from the internal measurements.
This is factory-set by Mantracourt during the production process.
The main outputs from this are –
• MVV is the factory calibrated output, in mV/V units.
• ELEC is the mV/V in % terms. Where the 100% value is set using NMMV. This is for backwards compatibility only.
• TEMP is a device temperature measurement, in °C and requires an optional module.
There are also two flags, ECOMUR and ECOMOR (not shown on the diagram), which indicate an input electrical
under- or over-range.
Mantracourt Electronics Limited DCell & DSC MantraCAN User Manual
Cell
x
*CTGx (Ctx)
*CTOx (Ctx)
CMVV
X
CGAI
COFS
<
CRAWUR
CMIN
>
CRAWOR
CMAX
CRAW
CLKx (CLXx)
+
CELL
System
x
SGAI
SOFS
<
SRAWUR
SMIN
>
SRAWOR
SMAX
SRAW
SZ
SYS
SOUT
38
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