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OM5-BP-SKT-C ANALOG MODULE EVALUATION BOARD
DESCRIPTION
The OM5-BP-SKT-C is a single channel board with a test socket for OM5
module evaluation (Figure 19). All signal input/output, control, and power
connections are connected to terminal blocks for ease of user access. A cold
junction temperature sensor circuit is included for evaluation of thermo-
couple modules. (See Figure 20 for schematic).
The OM5-BP-SKT-C is mechanically compatible with DIN rail mounting
using the following elements:
2 OM7-DIN-SF base elements with snap foot
2 OM7-DIN-SE side elements
4 OM7-DIN-CP connection pins
Two jumpers are provided for customer use. The first, J1, provides a current
path between +5V Power Common (module pin 16) and I/O Common
(module pin 19). A path must exist between the host control logic power
common and module I/O Common for proper operation of the module output
switch or track-and-hold circuit. If this connection exists elsewhere in the
system, jumper J1 should be removed since possible ground loops could
exist. Other connections of power ground and signal ground usually occur
at the A/D or D/A converter of the host measurement system.
Jumper J2 is used in the cold junction compensation circuit. If it is installed,
the compensation circuit is enabled and will provide the proper compensa-
tion voltage to correct for the thermoelectric effect at the +In and –In screw
terminals. If an external simulation voltage is desired for cold junction
compensation, J2 should be removed. The external voltage is applied at the
sockets labled CJC+ and CJC–. An external voltage of 510.0 mV corresponds
to an ambient temperature of +25 °C. The transfer function of the onboard
compensation circuit is V
= 0.510 –0.0025(T–25)V.
CJC
RD EN\
WR EN\
Reserved
PCOM
TB3
NOTES:
1. J1 and J2 are factory installed.
2. SCMXCJC is a CJC temperature sensor.
3. Resistor SCMXR1 is an optional I/V conversion
resistor for current inputs, not factory installed.
FIGURE 20. OM5-BP-SKT-C Evaluation Board Schematic.
TB1
I/O COM
PCOM
–In 5
–EXC 3
–SEN 1
+5
PCOM
J2
DZ1
LED
PCOM
TB4
–EXC
0.25" (6.4mm) Typical
0.25"
(6.4mm)
Typical
Control
RD EN\
WR EN\
Reserved
PCOM
TB1
+5V
4.25"
PCOM
(108mm)
TB3
–EXC
–In
FIGURE 19. OM5-BP-SKT-C Evaluation Board Dimensions And Pin Layout.
23
22
21
20
19
18
17
16
OM5
PCOM
6 +In
4 +EXC
2 +SEN
+
CJC
–
OMX-CJC-C
OMX-1362-C
–In +In
+EXC
48
2.85"
(72.4mm)
Local I/O
V
OUT
I/O COM
V
IN
I/O COM
TB2
J1
+
CJC
–
J2
OMX-1362-C
OMX-CJC-C
TB4
+EXC
+In
TB2
V
OUT
I/O COM
V
IN
I/O COM
J1
I/O COM
PCOM
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