Omega Engineering OMB-1108-0901 用户手册
DaqTemp User’s Manual
09-06-02
Overview & Theory of Operation 1-3
Differential Input Channels (
1H / 1L - 7H / 7L
)
Each DaqTemp model has seven differential input channels for measuring voltage. The voltage channels
are labeled from 1H / 1L to 7H / 7L, with the “H” and “L” representing channel high and channel low.
The seven channels are located on the Analog I/O portion of the card.
are labeled from 1H / 1L to 7H / 7L, with the “H” and “L” representing channel high and channel low.
The seven channels are located on the Analog I/O portion of the card.
Each differential input channel also has a current shunt resistor that can be user-installed. The resistor will
convert a current to a voltage, the voltage will then be measured by the DaqTemp PCI board. This is a
handy way to measure 4-20mA current loops or make current-based measurements in general. The right-
hand figure shows how the resistors are connected to both the low-side and high-side of each differential
input. Note that R1 is matched to analog input 1, R2 to analog input 2, etc.
convert a current to a voltage, the voltage will then be measured by the DaqTemp PCI board. This is a
handy way to measure 4-20mA current loops or make current-based measurements in general. The right-
hand figure shows how the resistors are connected to both the low-side and high-side of each differential
input. Note that R1 is matched to analog input 1, R2 to analog input 2, etc.
Analog I/O Section of DaqTemp
Digital and Analog I/O Card
Differential Input Channels 1 and 2
with User-Installed Resistors
Analog Outputs (
DAC0, DAC1, DAC2, and DAC3
)
The “A” model DaqTemps have Analog Output capability. DaqTemp7A has two digital-to-analog
converters. These are designated as DAC0 and DAC1. DaqTemp14A has four DACs designated as DAC0,
DAC1, DAC2, and DAC3. The DAC channel connections are represented in the above, left-hand figure.
converters. These are designated as DAC0 and DAC1. DaqTemp14A has four DACs designated as DAC0,
DAC1, DAC2, and DAC3. The DAC channel connections are represented in the above, left-hand figure.
Note that the same Digital and Analog I/O Terminal Block Card is used in all DaqTemp models, regardless
of the unit’s features. Because of this, the following should be realized:
of the unit’s features. Because of this, the following should be realized:
•
DAC2 and DAC3 do not apply to DaqTemp7A. However, the Digital and Analog I/O Terminal
Block Card includes connection labels for DAC2 and DAC3.
Block Card includes connection labels for DAC2 and DAC3.
•
Analog Outputs do not apply to DaqTemp7 or to DaqTemp14. However, the Digital and
Analog I/O Terminal Block Card includes connection labels for DAC0, DAC1, DAC2, and DAC3.
Analog I/O Terminal Block Card includes connection labels for DAC0, DAC1, DAC2, and DAC3.