Spectrum Controls 1746sc-NI8u - Manual (Page 31)

Chapter 2: Installing And Wiring Your Module 19
- extract the drain wire and signal wires
- remove the foil shield
- bundle the input cables with a cable strap
4. Connect pairs of drain wires together, Channels 0 and 1, Channels 2
and 3, Channels 4 and 5, Channels 6 and 7. Keep drain wires as short
as possible.
5. Connect the drain wires to the shield inputs of the terminal block.
Channel 0 and 1 drain wires to the shield 0/1 input pin
Channel 2 and 3 drain wires to the shield 2/3 input pin
Channel 4 and 5 drain wires to the shield 4/5 input pin
Channel 6 and 7 drain wires to the shield 6/7 input pin
6. Connect the signal wires of each channel to the terminal block.
Important: Only after verifying that your connections are correct
for each channel, trim the lengths to keep them short. Avoid
cutting leads too short.
7. Connect the chassis ground terminal/lug to the nearest chassis
mounting bolt with 14 gauge wire. (Looking at the face of the
module, the terminal/lug is near the terminal block and above
power supply PS2 on the primary side of the PCB.)
8. At the source-end of cables from mV devices:
- remove the drain wire and foil shield
- apply shrink wrap as an option
- connect to mV devices keeping the leads short
Important: If noise persists, try grounding the opposite end of the
cable, instead (Ground one end only.)
Important: For CE compliance, Ferrite EMI Suppressors are needed
on each channel’s terminal block connection. If remote CJCs are
installed, shielded wire must be used and a Ferrite EMI suppressor is
needed on each CJC input connection. The drain wire of the CJC
cable must be connected to a shield connection at the module. Apply
the suppressor close to the module terminal block, as shown below.
A Steward Part 28B2024-0A0 or equivalent is recommended. The
Steward 28B2024-0A0 has an impedance of 157
Ω at 25 MHz, 256 Ω at
100 MHz, and can accomodate one turn of wire.