GE IC697VRD008 RTD/Strain Bridge Module
Module Characteristics
Linearity, all ranges & outputs 1 LSB resolution value
Power supply range 20 to 29 volts, DC. 5% maximum ripple
24V Power input current
Standby (no output)
Operating
80 mA typical
180 mA (including loop current), maximum
Module power dissipation 1.5 Watts, minimum, 4.3 Watts maximum
Temperature coefficient +/–.002% of value per degree C, typical,
+/–.005% of value per degree C, maximum
Isolation to ground and logic 1500 VAC for 1 minute, 250 VAC continuous
Input or channel to channel common mode None; single ended grouped out
Current Drawn from BIU Power Supply 51 mA maximum
Output Characteristics
Digital Resolution 12 bits, typical
Current
Analog Resolution, LSB current
4 – 20 range
0 – 20 range
4.0 microAmps, typical
5.0 microAmps, typical
Output current range
JMP open
JMP to RET
4 mA, minimum, 20mA maximum
.05 mA minimum, 20mA maximum (note 1)
Current load impedance 0 Ohms minimum, 600 Ohms maximum (note 2)
Open wire (current only) 800 load Ohms minimum (note 3)
Over–range 20.000 mA minimum, 20.500 mA maximum
Output error, current (note 5) Ç 20µA Ç 0.1% of value, maximum
Voltage
Analog Resolution, LSB voltage
0–10
0–12.5
2.5 mV typical
3.125mV typical
Output voltage range
JMP open
JMP to RET
.02 Volts minimum, 10 Volts maximum (note 1)
.02 Volts minimum, 12.5 Volts maximum
Voltage load impedance 2K Ohms minimum for 10V output, 5 K for 12.5V output
Output error, voltage (note 5) Ç 10mVÇ 0.25% of value, maximum
note 1: May limit or become non–linear below minimum values given, due to saturation of output drivers.
note 2: Minimum load should be 250 ohms if ambient exceeds 50 C. Valid over rated 18– 30 supply voltage.
Maximum load can be increased to 800 ohms if min. supply voltage is greater than 23.0 volts, including ripple.
note 3: Open wire occurs when there is insufficient compliance voltage to drive output to commanded value.
Therefore occurrence of open wire depends on combination of output load and current. The open wire warning
may occur continuously on a disconnected output, such as not used, or voltage used instead.
note 4: In the presence of severe RF interference (IEC 801–3, 10V/m), accuracy may be degraded to 1mA or
0.5V

Instrumentation grade shielded twisted pair or 3 wire twisted (triad) wire should be used for
best noise immunity. The shield should be terminated at a local panel ground near the module.
The module local loop supply may be either floating or grounded, and may be shared with
other similar functions. All loads have a common return bus (RET) available at the module
for the negative side of the loads. This is internally connected through a 10-Ohm buffer
resistor to the supply negative side B terminal. Normally, only ungrounded loads are
recommended.
If a grounded load must be driven, a circulating ground loop current may be set up between
the load and ungrounded module supply. (This may reduce accuracy). The internal
resistance lessens the effect for small ground voltage differences.
CAUTION
The module may be damaged if high ground voltage differences occur due to
miswiring or high power surges.
Ordinarily no additional wiring to the RET bus is needed. However, if a low-impedance
ground is required to all devices, the proper way is to jumper any RET terminal to the power
B terminal at the module and ground the Loop supply externally