Measurement Computing Data Acquisition Systems rev.10.4 - Manual (Page 176)

daqCvtTCSetup
Also See: daqCvtTCConvert, daqCvtTCConvertF, daqCvtTCSetupConvert, daqCvtTCSetupConvertF
Format
daqCvtTCSetup(nscan, cjcPosition, ntc, tcType, bipolar, avg)
Purpose
daqCvtTCSetup sets up the conversion of data acquired from a thermocouple (T/C).
Parameter Summary
Parameter Type Description
nscan DWORD Number of channel readings in a single scan
cjcPosition DWORD Position of the cold-junction compensation circuit (CJC) reading within
each scan--not the CJC zero reading, if any
ntc DWORD Number of thermocouple signals that are to be converted to temperature
values
tcType TCType Type of thermocouples that generated the measurements
bipolar BOOL Must be set true if the readings were acquired with the device set for
bipolar operation; must be set false (zero) for unipolar operation
avg DWORD Type of averaging to be performed
Parameter Values
nscan: valid values range from 2 to 512; this number should be equal to
(the number of T/Cs + the number of CJCs + any zero readings + any additional voltage readings)
cjcPosition:
valid values depend on whether or not zero compensation is
being used: values range from 0 to
(nscan-2) with no zero compensation, and from 2 to (nscan-2) with zero compensation
ntc: valid values range from 1 to [(nscan-1)-cjcPosition]
tcType: see table below
bipolar: valid values are either true (
≠ 0) or false ( = 0)
avg: see table below
Parameter Type Definitions
tcType–( TCType)
Definition Description
Dbk19TCTypeJ Specifies a Type J thermocouple
Dbk19TCTypeK Specifies a Type K thermocouple
Dbk19TCTypeT Specifies a Type T thermocouple
Dbk19TCTypeE Specifies a Type E thermocouple
Dbk19TCTypeN28 Specifies a Type N28 thermocouple
Dbk19TCTypeN14 Specifies a Type N14 thermocouple
Dbk19TCTypeS Specifies a Type S thermocouple
Dbk19TCTypeR Specifies a Type R thermocouple
Dbk19TCTypeB Specifies a Type B thermocouple
avg
Definition Description
avg = 0 Specifies block averaging--all scans are averaged together to compute a single value for each channel
avg = 1 Specifies no averaging--each scan’s readings are converted into measured signals
avg
≥ 2 Specifies moving average--each scan’s readings are averaged with the avg-1 preceding scans’
readings before conversion
4.3-50 Daq API Command Reference 908494 Programmer’s Manual