Omega Engineering OM-DAQ-USB-2401 Manual de usuario Pagina 35
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Resolution (Effective Number of Bits - ENOB, RMS) – The number of reliable
data bits that exist for a signal’s measurement. The greater the resolution, the
more detailed the reading. For example, with an increased resolution, a reading
of 5.12 V could become 5.11896 V. The DAQ actually provides for 24 bits of data
information; however, the accuracy of the least significant bits decreases as the
measurement duration speeds up.
When measuring variable input signals (as opposed to
relatively steady input signals), the variable signals will
require more samples/sec to obtain a realistic signal
representation.
At a scan time greater than 6.5 seconds, the last 1.5 bits are considered unreliable,
resulting in a resolution of 22.5 bits. At a very fast scan time (1 millisecond), the
seven least significant bits are unreliable, resulting in 17 bit accuracy. When you
select the Scan Time you also determine the scan (sample) rate and resolution for
the applicable channel. For the DAQ’s analog input applications, scan (sample)
rates range from 0.0002778 samples/sec (1 hr/scan) up to 1000 samples/sec
(m/scan), and corresponding resolution ranges from 22.5 to 17 bits.
4.10 Automatic Calibration
The DAQ unit contains a built-in source for performing automatic self-
calibrations. These calibrations can be performed between scans periodically
throughout the measurement process, as indicated in the following figure. Such
calibration ensures accurate measurements, even in environments that
experience significant temperature fluctuations. The figure below shows an
initial calibration followed by the scan/calibrate, scan/calibrate pattern.
The continuous calibration feature is built into the DAQ
system. With Auto-Calibration enabled, you may experience
slower sample rates especially with multiple chanels turned on.
Figure 4-27. Calibration/Scan Arrangement
Software
4
4-17
NOTE:
NOTE:
0
SCAN PERIOD
TIME
INITIAL CALIBRATION CALIBRATIONSCAN CALIBRATIONSCAN CALIBRATIONSCAN
- User’s Guide 1
- TABLE OF 3
- CONTENTS 3
- Section 1 - Introduction 7
- 1.3 Statement on CE Marking 8
- Introduction 9
- Section 2 - Hardware 10
- Section 3 - Hardware Setup 11
- Hardware Setup 12
- (OPTIONAL) 13
- 3.5 OM-DAQ-USB-2401 Mounting 16
- Section 4 - Software 19
- Figure 4-1. Welcome Screen 20
- Software 21
- Figure 4-5. File Menu 24
- Figure 4-6. Device Menu 24
- Figure 4-7. Tools Menu 25
- Fgure 4-8. Help Menu 25
- Figure 4-10. Scan Options 27
- Figure 4-11. Units Options 27
- Figure 4-13. Trigger Options 28
- Figure 4-16. Data Tab 29
- Figure 4-23. Waveform Screen 31
- 4.4 Power Line Rejection 32
- 4.5 Optical Isolation 32
- 4.6 A/D Conversion 32
- 4.7 Input Ranges 33
- Analog Input Channels Diagram 34
- SCAN PERIOD 35
- Signal Management 37
- 5.4 Triggering 40
- 5.5 Signal Modes 40
- 5.6 System Noise 42
- 5.7 Averaging 42
- 5.8 Analog Filtering 42
- 5.10 Crosstalk 43
- (MIDPOINT OF CABLES) 44
- Figure 6-2 Ferrite Core 45
- Section 7 – Troubleshooting 46
- Service and Calibration 47
- Section 9 – Specifications 48
- Specifications 49
- WARRANTY/DISCLAIMER 55
- RETURN REQUESTS/INQUIRIES 55
- Shop online at omega.com 56
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