Measurement-computing TempBook rev.3.0 Instrukcja Użytkownika Pobierz pdf (Strona 148)

11-24 daqCommand Reference (

Enhanced

API) TempBook User’s Manual

daqCvtTCSetup

DLL Function

daqCvtTCSetup(DWORD nscan, DWORD cjcPosition, DWORD ntc, TCType tcType, BOOL

bipolar, DWORD avg);

daqCvtTCSetup(DWORD nscan, DWORD cjcPosition, DWORD ntc, TCType tcType, BOOL

bipolar, DWORD avg);

Visual BASIC

VBdaqCvtTCSetup&(ByVal nscan&, ByVal cjcPosition&, ByVal ntc&, ByVal tcType&,

ByVal bipolar&, ByVal avg&)

Delphi

daqCvtTCSetup(nscan:DWORD; cjcPosition:DWORD; ntc:DWORD; tcType:TCType;

bipolar:longbool; avg:DWORD)

Parameters

nscan

The number of readings in a single scan of DaqBook/DaqBoard data. The daqCvtTC… functions can

convert several consecutive scans worth of data in a single invocation.

Valid range: 2 to 512.

cjcPosition

The position of the actual cold-junction compensation circuit (CJC) reading within each scan (not the CJC

zero reading, if any). The first reading of the scan is position 0, and the last reading is nscan -1. Each

scan of temperature data must include a reading of the CJC signal on the expansion board to which the

thermocouples are attached. The CJC readings must be taken with the gain in the section

Scan Setup

Valid range: 0 to nscan-2 with no zero compensation; 2 to nscan-2 with zero compensation.

ntc

The number of thermocouple signals that are to be converted to temperature values. The thermocouple

signal readings must immediately follow the CJC reading in the scan data. The first thermocouple signal

is at scan position cjcPosition+1,; the next is at cjcPosition+2,; and so on. Valid range: 1 to nscan-1-

cjcPosition.

tcType

The type of thermocouples that generated the measurements. Valid range: One of the pre-defined values,

TbkTCTypeJ, TbkTCTypeK, TbkTCTypeT, TbkTCTypeE, TbkTCTypeN28, TbkTCTypeN14,

TbkTCTypeS, TbkTCTypeR

TbkTCTypeB.

bipolar

Must be set true (non-zero) if the readings were acquired with the Daq* set for bipolar operation. Must be

set false (zero) for unipolar operation. The required gain settings for the CJC and thermocouple channels

change depending on the unipolar/bipolar mode. Valid range: 0 for unipolar or any non-zero value for

bipolar.

avg

The type of averaging to be performed. Valid range: any unsigned integer. Since the thermocouple voltage

may be small compared to the ambient electrical noise, averaging may be necessary to yield a steady

temperature output.

0 specifies block averaging in which all of the scans are averaged together to compute a single temperature

measurement for each of the ntemp thermocouples.

1 specifies no averaging. Each scan’s readings are converted into ntemp measured temperatures for a

total of scans*ntemp results.

2 or more specifies moving average of the specified number of scans. Scan readings are averaged with the

avg-1 preceding scans’ readings before conversion. The first avg-1 scans are averaged with all of the

preceding scans because they do not have enough preceding scans. For example, if avg is 3, then the

results from the first scan are not averaged at all, the results from the second scan are averaged with the

first scan, the results from the third and subsequent scans are averaged with the preceding two scans as

shown in the table.

Returns

DerrTCE_PARAM

- Parameter out of range

DerrTCE_TYPE

- Invalid thermocouple type

DerrNoError

- No Error (also, refer to

API Error Codes

on page 11-39)

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