TC-2190 Adapter Installation Guide
4
ni.com
If you need to change jumper W1, refer to Figure 1 as you complete the
following steps:
1.
Using the Number 1 Phillips screwdriver, remove the four countersunk
front panel screws.
2.
Remove the two rear panel screws that hold the rear 68-pin connector.
3.
Hold the front panel and slide the assembly out of the metal case.
4.
Set jumper W1 as needed.
5.
Reassemble the TC-2190, following this procedure in reverse order.
Do not overtighten the screws.
Table 1.
TC-2190 Jumper Configuration Options
Jumper W1
Configuration
Description
When to Use This Configuration
100
Ω
(factory default)—This
setting connects the TC-2190
metal chassis to NI 435
X
ground through a 100
Ω
resistor, while keeping any
potential ground loop current
very small.
Use this setting when you are using
the SH6868 cable, and:
• You have not rack-mounted the
TC-2190, or
• You have mounted the TC-2190 on
a rack, but are unsure whether the
rack and the TC-2190 are
grounded.
0
Ω
—This setting connects
the TC-2190 metal chassis to
NI 435
X
ground.
Use this setting when you are using
the R6868 cable, and:
• You have not rack-mounted the
TC-2190, or
• You have mounted the TC-2190 on
a rack and are sure that the rack and
the TC-2190 are not grounded.
Open—This setting
disconnects the TC-2190
metal chassis from NI 435
X
ground.
Use this setting when you are using
either the SH6868 cable or the
R6868 cable, and:
• You have mounted the TC-2190 on
a rack, and
• You are sure that the rack and the
TC-2190 are grounded.
OPEN
100
Ω
0
Ω
OPEN
100
Ω
0
Ω
OPEN
100
Ω
0
Ω
