Measurement Computing Data Acquisition Systems rev.10.4 - Manual (Page 179)

daqCvtTCSetupConvert
and
daqCvtTCSetupConvertF
Also See: daqCvtTCConvert, daqCvtTCConvertF, daqCvtTCSetup
Format
daqCvtCSetupConvert(nscan, cjcPosition, ntc, tcType, bipolar, avg, counts,
scans, temp, ntemp)
Purpose
daqCvtTCSetupConvert and daqCvtTCSetupConvertF are each used to set up and convert raw
thermocouple (T/C) data to data on a Celsius scale. See Note 1.
Parameter Summary
Parameter Type Description
nscan DWORD Number of channel readings in a single scan
cjcPosition DWORD Position of the CJC reading within the scan
ntc DWORD Number of thermocouple readings that immediately follow the CJC reading
within the scan
tcType TCType Type of thermocouples being measured
bipolar BOOL Must be set true if the readings were acquired with the device set for
bipolar operation; must be set false for unipolar operation
avg DWORD Type of averaging to use
counts PWORD Array of raw data from one or more scans
scans DWORD Number of scans of raw data in counts array (number of pre-trigger + post-
trigger scans)
temp PSHORT Variable array to hold converted temperature results (see Note 1)
ntemp DWORD Number of entries in the temperature array
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
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. (See Note 1)
ntemp:
the 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)]
Note 1: daqCvtTCSetupConvert converts temperature readings to values in tenths of degrees Celsius (0.1°C).
daqCvtTCSetupConvertF 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 4.3-53