Measurement-computing Data Acquisition Systems rev.10.4 Manuel d'utilisateur Page 173
- Page / 366
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Reading Scan
Shorted Channels 0 1 2 3
1
V (ignored) V (ignored) CJC J1a J1b J1c
2
V (ignored) V (ignored) CJC J2a J2b J2c
3
V (ignored) V (ignored) CJC J3a J3b J3c
4
V (ignored) V (ignored) CJC J4a J4b J4c
In either case, the CJC and T/C readings are used to produce one temperature result for each T/C reading.
Thus, the 24 original readings are reduced to 12 temperatures.
To measure temperatures, the scan must be set up so the T/C measurements consecutively follow their
corresponding CJC measurement (the CJC measurement need not be the first element in the scan). If auto-
zeroing is enabled, the CJC measurement must be preceded by both a CJC zero measurement and a T/C zero
measurement.
All of the thermocouples converted with a single invocation of the conversion functions must be of the same
type: J, K, T, E, N28, N14, S, R, or B. To measure with more than one type of thermocouple, they must be
sorted by type within the scan, and each type must be preceded by the related CJC.
The scan is not restricted to thermocouple measurements. The scan may include other types of signals such as
voltage, current, or digital input; but conversion of these readings cannot be performed by the temperature
conversion functions cannot handle them.
T/C Gains Settings
The temperature measurements must be made with the correct gain settings. The gain settings for the different
thermocouple types depend on the bipolar/unipolar setting of the device, and the type of card being used. PC
cards can only be set for bipolar acquisitions, and have their own set of gain codes. The gains settings should
be established with the daqAdcSetScan function, as specified in the following tables.
Unipolar operations are not recommended for thermocouple measurement unless the
measured temperatures will be greater than the device temperature.
DBK19 and DBK52 Gain Codes
T/C
Type
Unipolar Gain Code Bipolar Gain Code
Bipolar Gain Codes for
Daq/2000 Series devices*
and PC Cards
CJC
Dbk19UniCJC Dbk19BiCJC Dbk19PCCBiCJC
J
Dbk19UniTypeJ Dbk19BiTypeJ Dbk19PCCBiTypeJ
K
Dbk19UniTypeK Dbk19BiTypeK Dbk19PCCBiTypeK
T
Dbk19UniTypeT Dbk19BiTypeT Dbk19PCCBiTypeT
E
Dbk19UniTypeE Dbk19BiTypeE Dbk19PCCBiTypeE
N28
Dbk19UniTypeN28 Dbk19BiTypeN28 Dbk19PCCBiTypeN28
N14
Dbk19UniTypeN14 Dbk19BiTypeN14 Dbk19PCCBiTypeN14
S
Dbk19UniTypeS Dbk19BiTypeS Dbk19PCCBiTypeS
R
Dbk19UniTypeR Dbk19BiTypeR Dbk19PCCBiTypeR
B
Dbk19UniTypeB Dbk19BiTypeB Dbk19PCCBiTypeB
* Daq/2000 Series devices include DaqBook/2000 Series, DaqScan/2000 Series, DaqLab/2000 Series, and
DaqBoard/2000 Series devices.
Programmer’s Manual 908494 Daq API Command Reference 4.3-47
- *372195A-01* 1
- How to use this Manual 3
- 908494 Programmer’s Manual 4
- Table of Contents 5
- Introduction 1 7
- Language Support 8
- Driver Installation 9
- 908494 Programmer’s Manual 10
- Data Acquisition Environment 11
- Signal Environment 12
- 988594 Programmer’s Manual 14
- For x% = 0 To 3 30
- 0, 0, x%, bitVal&) 30
- Next x% 30
- Zero Compensation 33
- Linear Conversion 35
- End Sub 36
- Using Multiple Devices 3 37
- Internal Clock Method 40
- Master Clock Method 41
- External Clock Method 43
- Overview 45
- 938395 Programmer’s Manual 46
- Mask and Flag Definitions 50
- 961 962 963 ... 999 59
- 941 942 ... 958 959 960 59
- Raw Data Formats 81
- Setting the Scan Rate 89
- Scan Rate Mode 89
- Scan Rate State 90
- Actual Scan Rate 90
- 94
- DBK16-Read Offset Trimpot 95
- DBK43-Read Offset Trimpot 96
- Typical flags Settings 100
- Settings 101
- Prototypes 102
- Program References 102
- Function Usage 104
- Visual BASIC 105
- Returns 114
- Data Transfer Progress 115
- Example Acquisition States 116
- DazcNone 124
- DazcAutoZero 124
- Parameter Type Description 129
- Definition Description 129
- Purpose 131
- Offset value to apply 142
- Parameter Values 144
- parameters 148
- Parameter Summary 150
- Parameter Type Definitions 150
- Moving Averages 160
- Definition Description 165
- Using Thermocouples (T/Cs) 172
- T/C Gains Settings 173
- Daq/2000 Series devices* 174
- Setting the Output Mode 184
- Buffer Management 201
- DAC0 DAC1 DAC2 DAC3 P3 DO 202
- DAC0 DAC2 P3 DO 202
- Note 1: 206
- Offset for header in bytes 208
- Update Cycle Data Blocks 211
- Update/Sample Data Format 212
- Output From File Operation 212
- DaqBoard/2000c Series 219
- Setting the DAC Value 227
- 908794 Programmer’s Manual 232
- (continued) 249
- DdiProtocolInfo 251
- DdiExtFeatures 251
- Local I/O 262
- Expansion I/O 262
- Local I/O 266
- 957193 Programmer’s Manual 280
- (for 14 sample settings 282
- 2, 4, 8, 16, 32, 64 282
- 128, etc. up to 16384) 282
- Option Value (optionValue) 284
- Counter Mode 285
- 908594 Programmer’s Manual 286
- Set the Excitation Source 289
- DmotWbk14ExcSrcApply 289
- Sets the Dac Offset 290
- Use DC coupling when 290
- Example: 291
- DcovWbk17Mode_Period 295
- DcovWbk17Mode_Pulsewidth 296
- DcovWbk17Mode_Timing 296
- DcovWbk17Mode_Encoder 296
- Setting the Trigger Level 306
- API Error Codes - daqError 319
- A2 - 162 331
- Programmer’s Manual 332
- Appendix A A 333
- 988294 Programmer’s Manual 334
- 939198 Programmer’s Manual 336
- Custom OEM Installation C 337
- WIN 9x/Me WIN NT/2000/XP 338
- WIN 9x/Me and 338
- WIN NT/2000/XP 338
- Installation Locations: 339
- 958293 Programmer’s Manual 340
- 938295 Programmer’s Manual 342
- Format 347
- Time-of-Day Configuration 356
- Glossary 359
- 986896 Programmer’s Manual 360
- 986896 Glossary G-3 361
- 986896 Glossary G-5 363
- 986896 Glossary G-7 365
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