參數(shù)資料
型號(hào): PCL-818L
廠商: Electronic Theatre Controls, Inc.
英文描述: High-performance DAS card with programmable gain
中文描述: 高性能DAS的可編程增益卡
文件頁(yè)數(shù): 27/74頁(yè)
文件大?。?/td> 546K
代理商: PCL-818L
Chapter 3 Signal connections
23
must exist between LOW and ground to define a common reference
point for floating signal sources. To measure a floating source
connect the input channel as shown below:
If the signal source has one side connected to a local ground, the
signal source ground and the PCL-818L ground will not be at
exactly the same voltage, as they are connected through the ground
return of the equipment and building wiring. The difference between
the ground voltages forms a common-mode voltage.
To avoid the ground loop noise effect caused by common-mode
voltages, connect the signal ground to the LOW input. Do not
connect the LOW input to the PCL-818L ground directly. In some
cases you may also need a wire connection between the PCL-818L
ground and the signal source ground for better grounding. The
following two diagrams show correct and incorrect connections for a
differential input with local ground:
Correct connection
A.GND
+
Vs
-
+
Vin
-
+
-
HIGH
LOW
GND
+
Vs
-
+
Vin
-
+
-
HIGH
LOW
Vin=Vs
Vcm
+
_
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