HBM GEN3i, User Manual

Page: 641 / 1160

Bridge Mode
TEDS Class 3
TEDS
Class 2
optional
Bridge sensor
Shunt
-
+
R1
R2
R4
R3
Amplifier
-1
Excitation
Sense (-)
Excitation (-)
Sense (+)
Excitation (+)
120 Ω
- ¼ bridge
Signal (-)
Signal (+)
½ bridge
Signal ground
TEDS
Control
Teds (+)
Teds (-)
+
-
+V
-V
TEDS class 2/3
External shunt
CAL
Signal conditioner
+
-
+
-
U
excit
Int shunt
350
10 MΩ
10 MΩ
Ω
- ¼ bridge
Pos/neg Int/ext
Figure A.215: Bridge mode block diagram
Supported sensors Quarter/Half/Full bridge; strain gauge based sensors: load cells, force transducers, torque
transducers and pressure transducers
Quarter bridge connection
4 wire support; the 3
rd
wire keeps the measurement wire current free eliminating wire
resistance errors through the measurement wire, the 4
th
wire is used to sense the excitation
voltage
Built in quarter bridge completion resistor 120 Ω and 350 Ω, 0.1% 2 ppm/°C, wired to separate connector pin
Built in half bridge completion resistors 2 times 10 kΩ, 0.05% 2 ppm/°C tracking
Bridge excitation modes Constant voltage
Constant voltage excitation
Selectable excitation voltage
Bipolar
±
0.5 V DC to
±
5.0 V DC, maximum 30 mA
Excitation voltage in
-
accuracy
±
0.25%
Excitation voltage sense 2 separate connector pins available, wiring required (no internal bypass)
Bridge balance
Operation principal Bridge in
-
balance measured and software compensated by means of auto zero
Auto zero Parallel execution of auto zero on all channels on multiple cards reducing zero time
significantly
Bridge shunt
Bridge shunt resistor selection Software selectable 2 sources
1 built
-
in shunt resistors, or external shunt
Bridge shunt method Software selectable to positive or negative excitation voltage
External shunt 1 separate connector pin to wire shunt out to sensor connection points
Built
-
in shunt resistor
Type Metal foil
Shunt resistor 100 kΩ, 0.1% 5 ppm/°C
TEDS support Class 2 and 3 (no software support at release date)
GEN3i
I3763-3.1 en HBM: public 641