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3.1.9 Board and Signal Source Have Isolated Grounds
Some signal sources will already be electrically isolated from the board. Figure 3-4 shows a typical isolated ground system. These
signal sources are often battery powered, or are fairly expensive pieces of equipment (since isolation can be expensive), isolated
ground systems provide excellent performance, but require some extra effort during connections to assure optimum performance
is obtained. Please refer to the following sections for further details.
3.2 WIRING CONFIGURATIONS
Combining all the grounding and input type possibilities provides us with the following potential connection configurations. The
combinations along with our recommendations on usage are shown in Table 3-1 below.
Table 3-1. Analog Input Configuration Recommendations
RecommendedDifferential Inputs
Already Isolated
Grounds
AcceptableSingle-ended InputsAlready Isolated Grounds
Unacceptable without
adding Isolation
Differential Inputs
Common Mode
Voltage > +/-10V
Unacceptable without
adding Isolation
Single-Ended Inputs
Common Mode
Voltage > +/- 10V
RecommendedDifferential Inputs
Common Mode
Voltage < +/-10V
Not RecommendedSingle-Ended Inputs
Common Mode
Voltage < +/-10V
AcceptableDifferential InputsCommon Ground
RecommendedSingle-Ended InputsCommon Ground
OUR VIEW
INPUT
CONFIGURATION
GROUND
CATEGORY
The following sections depicts recommended input wiring schemes for each of the seven possible input configuration/grounding
combinations.
3.2.1 Common Ground / Single-Ended Inputs
Single-ended is the recommended configuration for common ground connections. However, if some of your inputs are common
ground and some are not, we recommend you use the differential mode. There is no performance penalty (other than loss of
channels) for using a differential input to measure a common ground signal source. However the reverse is not true. Figure 3-4
below shows a recommended connection diagram for a common ground / single-ended input system.
Figure 3-4. Common Ground / Single-Ended Inputs
9
+
-
Input
Amp
To A /D
A/D Board
I/O
Connector
LL GND
CH IN
Signal
Source with
Common Gnd
Optional wire
since signal source
and A/D board share
common ground
Si
g
nal source and A/D board
sharin
g
common
g
round connected
to sin
g
le-ended input.
- Revision 9 1
- October, 2000 1
- HM CIO-DAS08PGx.lwp 2
- This page is blank 4
- 1: INTRODUCTION 5
- 1.2 HARDWARE INSTALLATION 6
- 2: SIGNAL CONNECTION 8
- 3: ANALOG CONNECTIONS 9
- 3.2 WIRING CONFIGURATIONS 13
- A/D Board 14
- 4: REGISTER ARCHITECTURE 17
- 4.2 A/D DATA REGISTER 18
- 4.6 COUNTER CONTROL REGISTER 21
- 4.7 COUNTER/TIMER 22
- 4.8 DIGITAL INPUT 23
- 4.9 DIGITAL OUTPUT 23
- 5: SPECIFICATIONS 25
- Counter section 26
- Environmental 26
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