National Instruments NI SCB-68A, Руководство пользователя

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NI SCB-68A User Manual
1. (Optional) Mount the SCB-68A to a panel or DIN rail, as described in the Mounting the
SCB-68A section.
2. Remove the cover.
3. Remove the film from both sides of the cover.
4. (Optional) If you are not using the SCB-68A with Connector 0 of an M/X Series device,
attach the quick reference label to the inside of the cover as shown in Figure 1-1. For quick
reference label PDFs for most compatible devices, refer to the KnowledgeBase document,
Where Can I Find NI SCB-68A Quick Reference Labels? . To access this KnowledgeBase,
go to
ni.com/info
and enter the Info Code
s cb68alabel s
.
Tip
You can stand the cover in the SCB-68A for easy reference, as shown in
Figure 1-1.
5. Configure switches for the signal types you are using, as explained in the Using the
SCB-68A in Direct Feedthrough Mode section or the Using the SCB-68A with MIO DAQ
Devices section.
6. Adjust the strain-relief bar by removing the strain-relief screws with a #2 Phillips
screwdriver.
7. Connect the wires to the screw terminals by stripping 6 mm (0.25 in.) of insulation,
inserting the wires into the screw terminals, and securely tightening the screws with the
flathead screwdriver to a torque of 0.5–0.6 N
⋅
m (4–5 in.
⋅
lb).
Caution
To ensure the specified EMC performance, signal wires routed outside of
the enclosure must be contained within a shielded cable and connected to shielded
accessories. Cable shields must be terminated to the chassis ground lug using as short
a connection as is practical.
8. Reinstall the strain-relief (if removed) and tighten the strain-relief screws. If the shielded
cable is too large to route through the strain-relief hardware, either use multiple,
smaller-diameter cables or remove the top strain-relief bar and add insulation or padding if
necessary to constrain the cable.
9. Replace the cover.
Caution
You must install cover prior to use.
Caution
Do not connect input voltages >30 V
rms
/42 V
pk
/60 VDC to the SCB-68A.
The SCB-68A is not designed for any input voltages
>
30 V
rms
/42 V
pk
/60 VDC, even
if a user-installed voltage divider reduces the voltage to within the input range of the
DAQ device. Input voltages >30 V
rms
/42 V
pk
/60 VDC can damage the SCB-68A, all
devices connected to it, and the host computer.
Caution
Do not use for measurements within Categories II, III, or IV.