Measurement Computing StrainBook/616 - Manual (Page 78)

CN-189 DB-9 Adapter Option
The CN-189 is intended for convenience and is not shielded. Higher signal quality will
be obtained with the use of shielded cables, such as the CA-177 strain gage cable.
CN-189 Schematic
The CN-189 can be configured to utilize the components of an installed CN-115 or CN-115-1 in accordance
with the following table.
CN-189 DB9 Adapter for WBK16, Configuration Table
Function P3 (on CN-189) P4 (on CN-189) Resistor Used in R1
1 Internal Excitation Sense Short 1 and 2 Short 6 and 7
2 ¼ Bridge Using (RA) 2-Wire Short 3 and 4
3 ¼ Bridge Using (RC) 2-Wire Short 5 and 6
4 ¼ Bridge Using (RE) 2-Wire Short 6 and 7
5 High Gain Amp Ground Path (Short) Short 5 and 6
6 High Gain Amp (Resistive)
Ground Path (EXT)
Resistor
between 5 and 6
7 High Gain Amp (RE) Ground Path (INT) Short 1 and 2
8 High Gain Amp (RC) Ground Path (INT) Short 2 and 3
9 High Gain Amp (RA) Ground Path (INT) Short 4 and 5
10 Current Measurement (Differential) Shunt resistor in R1
11 Differential Load Resistor Load resistor in R1
For the functions listed in the preceding table, internal StrainBook configurations
still apply as indicated on pages 6-8 through 6-11 .
6-14 Bridge Configurations 929494 StrainBook/616 User’s Manual