RMT DX6100 -- ISFF Usage

Settings

For HVAMS03 and Tram, we operated the DX6100 with the command settings:

jb 1000 2000 100 0 1 2000 [continuous measurement at 1 samp/s]
df 217f [display the variables below; correct CO2mr for temperature]
go [needed to start sensor after power-up]

Variables

Currently, ISFF ingests data from this sensor in nearly the same format that is reported by the sensor:


RMT name	ISFF name	ISFF scaling	Description	Units
Usign	Nmeas	1	Measurement channel	ADC counts
Uref	Nref	1	Reference channel	ADC counts
Tc	Topto	1	Optopair temperature	ADC counts
Vc	Vcool	1	Cooler voltage	DAC counts
Tamb	Tamb	1/10	"Ambient" temperature	K
D	Ratio	1*	Non-normalized ratio	non-dimensional
X,R	CO2mr	1*	Measured CO2 concentration	ppm

* - During HVAMS03, EVE multiplied these values by scaling factors of 10000 and 10, respectively, to convert from floating point to integer, which is reversed in later ISFF processing.

The CO2mr value has the internal factory default calibration applied, so the other values are not needed, in theory. We record them in case the user wants to apply a different calibration. Tamb probably is the temperature inside the measurement cell and should not be taken as the actual air temperature. (It appears to be ~7C higher in the HVAMS03 data.)