## DAPL Operating System | Processing Command
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Module SENSORM :: DIVIDER Convert measurements from a voltage divider network to determine resistance. Syntax DIVIDER( VIN, VS, RLOAD, [RCOEFF, LTMP,] [GAIN,] ROUT ) Parameters - VIN
- Input measurements of divider voltage
- FLOAT PIPE
- VS
- Nominal or measured excitation voltage driving divider network
- FLOAT CONSTANT | FLOAT PIPE
- RLOAD
- Nominal or calibrated load resistance, ohms at 0 degrees C
- FLOAT CONSTANT
- RCOEFF
- Temperature coefficient of resistance for load resistor
- FLOAT CONSTANT
- LTMP
- Input pipe with load temperature measurements, degrees C
- FLOAT PIPE
- GAIN
- Gain used to measure input signal
`VIN` - FLOAT CONSTANT
- ROUT
- Output resistance measurements, in ohms
- FLOAT PIPE
Description The The input divider voltage measurements are received through
the If the supply voltage is very well regulated, you can
measure it once and specify the value as a constant Specify the loading resistor value Most of the time, variations in operating temperature are
insignificant, and the load resistance can be presumed constant.
For these cases, omit the For processing each input value, the difference between
the known excitation voltage source and the measured divider
junction appears across the known loading resistor, hence the
divider current can be computed. This known divider current
passes through the unknown element to produce the measured
voltage, so its resistance can be computed, producing the
results placed into the Examples DIVIDER(IP2, 5.000, 10000.0, ROUT) Read the voltage at the junction between a load resistance
of exactly 10K ohms and an unknown resistive sensor when a 5.000
volt excitation voltage is applied across the divider network.
The voltages across the resistive sensor element are measured
with gain 1 and received from input sample channel pipe
DIVIDER(IP2, 4.968, 10008.0, 0.42, PAmb, 4.0, ROUT) This example is the same as the previous configuration,
except calibrated for maximum measurement accuracy. The
pre-measured supply voltage level is 4.958 ohms is specified
as a constant. The measured load resistor value is 10008
ohms. The nominal load resistance is observed to increase by 42
ohms over a 100 degree temperature swing, so a temperature
coefficient 0.42 ohms per degrees C is specified. The
measurements of divider voltage are captured using an amplifier
gain of 4.0. The operating temperature is separately measured
and provided in the See also: BRIDGE |