TDAS G5 DAS
User’s Manual
October 2019
5
11000-00010-MAN (Rev. 5)
Sensor Connections
Shunt Calibration Resistors
Conventional shunt calibration resistors are not supported in the TDAS G5 DAS. Shunt
emulation is used to perform shunt checks.
Shunt Emulation
The TDAS G5 DAS uses shunt emulation to perform shunt checks. Shunt emulation
eliminates the need for conventional shunt resistors and is enabled when “Emulation” is
chosen in the SIF as the shunt calibration method. This method applies a precise current
to a connected sensor and checks for expected deflection based on sensor impedance.
Shunt checks are performed under software control; settings are calculated by the
software and the applied shunt signal is automatically scaled to an appropriate
percentage of the requested range. (See the TDAS Control software manual for
additional information.)
It is always best to complete the bridge when using half-bridge sensors. We recommend
completing the bridge with fixed resistors on the +Sig side, then using the value of the
fixed resistors for shunt emulation.
guide pin
Shield
-Ex
ID/digital
+Ex
+Sig
-Sig
+Ex
+Sig
-Sig
R
R
R
R
-Ex
Dallas ID
Differential
Instrumentation
Amplifier
2.5 V
Ref
Excitation
5 V, 20 mA
Gain
Calibration
Excitation
Check ADC
Dallas ID
Interface
Digital Inputs
+5 V
-
+
TDAS G5 DAS
Sensor
Connector
Contact Closure
Shunt Check
Driver
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Diversified Technical Systems, Inc. - All Rights Reserved
