Measurement-computing CIO-DAS16/M1 Uživatelský manuál Strana 31
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- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
27
6. ELECTRONICS AND INTERFACING
This short, simple introduction to the electronics most often needed by I/O board users covers a few key
concepts.
6.1
COMMON MODE
Differential inputs have a common mode range (CMR or Vcm). Common mode range is the voltage range
over which differences in the low side of the signal and A/D input ground have no impact on the A/D's
measurement of the signal voltage. A differential input can reject differences between signal ground and
PC ground (Figure 6-1).
Figure 6-1. Differential Input Theory
The maximum difference which can be rejected is the CMR (Figure 6-2).
Figure 6-2. CMR Defined
HI
LO
Vs
Vs+Vc
Vc
Vcm = Vg1 -
G
S
I
G
N
A
L
g1
g2
+
-
DIFFERENTIAL INPUT
LL GND
CH 0 HI
CH 0 LO
+
-
DIFFERENTIAL
AMP
TO A/D
GND
V+
V-
19
18
17
16
15
37
36
35
34
PC GROUND
MAX CMR
MAX CMR + SIGNAL
CUMULATIVE SIGNAL RANGE
10V
11.5V
EXAMPLE 1
EXAMPLE 2
PC GROUND
MAX CMR + SIGNAL
CSR 11.5V
COMMON MODE 4V
MAX SIGNAL 5V
UNUSED CMR 3.5V
- CIO-DAS16/M1 1
- User’s Manual 1
- © Copyright 2000 2
- Table of Contents 3
- This page is blank 4
- 1. SOFTWARE INSTALLATION 5
- 2. HARDWARE INSTALLATION 5
- 3. SIGNAL CONNECTIONS 8
- 3.2.1 Analog Inputs 9
- 3.2.3 Shielding 9
- 3.2.4 Grounded Signal Source 9
- 3.2.5 Floating Signal Source 10
- 3.2.6 Avoiding Ground Loops 10
- 3.3.2 Counter Clock Jumper 11
- 4. REGISTER ARCHITECTURE 14
- 4.5 DT-CONNECT 16
- 4.6.11 COUNTER CHIP (82C54) 27
- 5. SPECIFICATIONS 28
- COMMON MODE 31
- DIFFERENTIAL INPUT 31
- 6.2 COMMON MISUNDERSTANDINGS 32
- 6.3 GROUND LOOPS 32
- 6.6 VOLTAGE DIVIDERS 34
- 6.7 LOW PASS FILTERS 36
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