Measurement Computing Data Acquisition Systems rev.10.4 - Manual (Page 171)

daqCvtTCConvert
and
daqCvTCConvertF
Also See: daqCvtTCSetup, daqCvtTCSetupConvert, daqCvtTCSetupConvertF
Format
daqCvtTCConvert(counts, scans, temp, ntemp)
Purpose
daqCvtTCConvert and daqCvtTCConvertF each convert raw data acquired from a thermocouple (T/C)
to a Celsius scale. See Note 1.
Parameter Summary
Parameter Type Description
counts PWORD Array of one or more scans of raw data
scans DWORD Number of scans of data in counts array (number of pre-trigger + post-
trigger scans)
temp PSHORT Variable array to hold converted temperature results (Note 1)
ntemp DWORD Number of entries in the temperature array
Parameter Values
counts: valid values range from 0 to 65,536 (each raw data item may be any 16-bit value)
scans: valid value range from 1 to 4,294,967,295; however, memory limitations may apply
temp: valid converted values stored in this array range from -2,000 (-200°C) to +13,720 (+1,372°C),
depending on the thermocouple type
ntemp: value of the ntemp parameter should be equal to number of T/Cs specified in setup times the
number of scans. If averaging is used, then ntemp should be equal to: [(number of T/Cs) *
(scans) * (the value of the avg parameter as set in the daqCvtTCSetup function)]
Returns
DerrTCE_NOSETUP Setup was not called
DerrTCE_PARAM Parameter out-of-range
DerrNoError No error
For more details on error messages refer to the Daq Error Table.
Function Usage
For all functions of the form daqCvt..., raw data to be converted must be unsigned
(i.e., the dafUnsigned value must be set using the daqAdcSetScan function).
For T/C and RTD conversion, users of Daq/2000 Series devices* and/or Daq PC Cards must
be sure that the main unit is using ten volt range gains settings, either unipolar (0 V to 10 V)
or bipolar (-5 V to +5 V).
See the “T/C Gains Settings” section in the daqCvtTCConvert function entry for the
appropriate settings.
* Daq/2000 Series devices include DaqBook/2000 Series, DaqScan/2000 Series, DaqLab/2000
Series, and DaqBoard/2000 Series devices.
Note 1: daqCvtTCConvert converts temperature readings to values in tenths of degrees Celsius (0.1°C).
daqCvtTCConvertF stores actual temperature values, i.e., actual instead of a value converted
to the nearest tenth of a degree °C.
Programmer’s Manual 908494 Daq API Command Reference 4.3-45