GE IC697VAL132 0 to 20ma, 12-bit, 32 Channel Single Ended
The “Int” units on the HHM configuration screen correspond to actual desired outputcurrent values, in microamps, provided the base terminal jumper corresponds to the module
range configuration. The Int unit values set in the configuration must be within the limits of
the range used. The module will operate with a range–jumper mismatch, but Int units
scaling will be invalid. The “Eng” units are the values supplied by the host.
Field Recalibration Using Scaling
Field recalibration can be accomplished by forcing the outputs to the “Eng Hi” and/or “Eng
Lo” calibration point values in the module configuration, reading the actual output
produced, and updating the configured values to the actual values. Usually, recalibrating the
high point only is sufficient. If the low point is done, it should be changed from the default
value of 0 volts or 4000 microAmps to get better accuracy. The following example shows a
two-point calibration for 0 to 10 volts:
1. Set the analog output scaling for 0 to 10 volts output:
Eng lo 100 (mV)
Eng hi 10,000 (mV)
Internal lo 4,160 (corresponds to 100 mV)
Internal hi 20,000 (corresponds to 100 mV)
2. Force the output to the low point value: 100 (= 0.100 volt)
3. Read the output using an accurate meter on the output. For example, you might get a
value of 0.107 volts, instead of 100.
4. Force the output to the high point value: 10000 (=10.000 volts)
5. Read the output using an accurate meter on the output. For example, you might get a
value of 9.985 volts, instead of 10.000 volts.
6. Change the scaling to the new calibrated values:
Eng lo 107 (reading in mv from step 3)
Eng hi 9985 (reading in mv from step 5)
Internal lo 4160 (microamps to yield voltage in step 2)
Internal hi 20000 (microamps to yield voltage in step 4)
7. The voltage output is now calibrated to your meter, within the approximately 3-millivolt
resolution of the output.
Use the new Eng Hi and Eng Lo values as calibration points when repeating, or go back to
step 1 and begin again. The scaling affects both the voltage and current forms of the output
point, so only one can be recalibrated.

Four D/A converters provide simultaneous current and voltage outputs from each output
channel. Current output spans are 0–20 or 4–20 mA; voltage spans are 0–10 or 0–12.5
volts. All outputs are isolated from ground and logic, but are grouped on a common power
supply. Outputs can be isolated as a group from the rest of the system if a separate isolated
loop supply is used.
.001mF
D to A
MOV
EMI Filter
30V
Chassis
24 V
10 Ohms
36V Terminals
EMI Filter
Each circuit provides simultaneous voltage and current outputs from the digital to analog
converter. All circuits share a common loop supply and return.
The current driver is a sourcing type. The low side of a load can be connected to RET, the
negative side of a 24 V loop supply, or a more negative point that can be up to 36 volts
negative with respect to the module 24 volt supply positive terminal.
Voltage output is relative to RET terminal, which is common to all circuits. The module’s 10
ohm resistor helps reduce ground loop circulating currents.
The operating range for an output can be changed to 0–20 mA, 0–12.5 volt by connecting
the JMP terminal to the RET terminal for that output, as illustrated above and on page
NO TAG of this datasheet.
The module contains MOV transient voltage suppressors, and RF bypass capacitors to the
module chassis. The chassis point is connected to the module case and the chassis ground
terminal on the module base. This should be grounded for best noise immunity.
Outputs default to minimum value upon initial powerup or loss of backplane power.