ADLINK ND-6067 - Manual (Page 269)

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6. Select the correct input range. Different input range has to
apply different calibration voltage.
7. Apply the correct offset voltage to channel 0, detail voltage
value, see table 9-1.
8. Send “Offset Calibration $(Addr)1” to analog input module
five times.(Actually, the address now is “00”, so the
command is “$001”).
9. Apply the correct span voltage to channel 0, detail voltage
value, see table 9-1.
10. Send “Span Calibration $(Addr)0” to analog input module
five times. (Actually, the address now is “00”, so the
command is “$001”).
*The apply source must be a precision source. The
error range in ±50uV is best.
CJC Calibration Procedure
1. Power off the module.
2. Connect the default pin to GND.(Because the calibration
procedures must be run under default mode).
3. Power on the module and find the module.
4. Ensure that the NuDAM units has been powered up for at
least 30 minutes and is located away from sources of heat,
in still air at constant temperature.
5. Place a calibrated temperature meter, with a resolution of
0.1
°C, in close proximity to the CJC sensor of the NuDAM
module.
6. Send command “Read CJC Status $(Addr)3” to read
temperature of CJC, then compare the temperature
returned from the CJC sensor with the calibrated
temperature. (Actually, the address now is “00”, so the
command is “$003”).
7. If the difference is less than
±0.1°C, the CJC offset is
correctly calibrated, if it is greater or less, proceed to step 8.
8. Send “CJC Offset Calibration $(Addr)9(+0000)” to set
initial CJC offset value to zero.
9. Repeat step 6, then proceed to step 10.
10. Send “CJC Offset Calibration $(Addr)9(Counts)” to
correct the CJC offset error.(counts is a 4-characters with a
sign + or -,range is 0000 to FFFF, each count equals