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EX1629 Basic Operation
61
TEDS
COMM
External customer
shunt cal
resistor terminals
Internal
Rcal
55K
-R Cal
+R Cal
Pin 5
Pin 4
TEDS
Device
(i.e. DS2430
or DS2431)
Strain
Bridge
8-pin telcom
connector (RJ-45)
350
120
User
10K
10K
+ Excitation
- Excitation
Quarter-Bridge
(1 of 48 channels)
+Excitation
+Sense
-Sense
+Excitation Sense
-Excitation Sense
-Excitation
+Excitation Sense
-Excitation Sense
RJ-45 Pin#
12345678
Pin 2
Pin 7
Pin 6
Pin 3
Pin 8
Pin 1
IO
GND
10K
10K
Instrumentation
Amplifier
+
-
x1
x10
x100
Hi
Lo
Shield
150
150
-Sense
-Cal
AGND
+Sense
Wagner
+Cal
AGND
430 kHz
LOW-PASS
FILTER
60.3 kHz
LOW-PASS
FILTER
ADC
TRIFILAR
FILTER
F
IGURE
3-12:
TEDS
W
IRING
S
CHEMATIC
NOTE
Wiring the TEDS device to the EX1629 may not be as expected given the signal names used. The
correct wiring is provided above in Figure 3-12 as well as below:
RJ-45 Pin 4 (RCAL + / TEDS +) to DS2430/1 GND
RJ-45 Pin 5 (RCAL - / TEDS -) to DS2430/1 IO
The “+” and “-” indicators for the signal names indicate that, since negative voltages are used to
communicate with the TEDS device, the GND signal is actually more positive than the IO signal.
Содержание EX1629
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