Omega Engineering OM-DAQ-USB-2401 Manual de usuario Pagina 41
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Differential mode refers to a mode, or circuit set-up, in which a voltage is
measured between two signal lines. The measured differential voltage is used for
a single channel. An advantage of using differential inputs is that they reduce
signal errors and the induction of noise resulting from ground current. The
following illustration is an example of how noise is reduced, or canceled-out,
when using the differential
Figure 5-3. Noise Reduction in Differential Mode
In the schematic, voltage signal S2 is subtracted from signal S1, resulting in the
output signal shown. The noise spikes (having the same polarity, phase, and
magnitude in each input signal) cancel each other out. This results in a clean
differential signal (S1 - S2).
Floating-differential measurements are made when low-level signals must be
measured in the presence of high levels of common-mode noise (e.g., a non-
grounded thermocouple). When the signal source has no direct connection to the
system analog common, one must be provided. In Omega Daq the connection to
analog common is provided in the circuitry with both the channel high and
channel low connected to analog common. Both of these connections to common
are made through 1 MΩ resistors. No additional connections of channel high and
low to common should be made.
Figure 5-4. Example of Floating Differential Circuit
Differential signal hookups do not provide isolation or any
kind of circuit protection.
Signal Management
5
5-5
NOTE:
- 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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