Keithley KPCI-3101 Series, User Manual

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3-10 Installation and Configuration KPCI-3101 — KPCI-3104 Series User’s Manual
Jumper W1
The STA-300 screw terminal panel contains jumper W1, and jumpers W4 to W7. Jumper W1
provides a common ground sense (jumpers W4 to W7 are not used). The following subsections
describe these jumpers.
NOTE The screw terminal panels are shipped with enough jumper plugs to
select every possible configuration. Spare jumper plugs are stored on the
panel itself (on the posts marked spare). Save these jumper plugs for
future use.
Configuring Jumper W1 - Common Ground Sense
When shipped from the factory, jumper W1 connects the low side of the input amplifier (Amp
Low) on the KPCI-3101–4 Series board to analog ground.
When using pseudo-differential analog inputs, remove jumper W1 and connect Amp Low to a
remote common-mode voltage to reject offset voltages common to all 16 input channels. Refer
to
Figure 3-4 for an example of removing jumper W1. See page 3-15 .
Figure 3-4
Removal of jumper W1 for remote ground sensing
+
STA-300 Panel
Signal Source
-
+
V
source
0
-
TB1
TB3
TB17
Analog In 0
Analog In 1
TB2
Jumper W1
Installed
(Amp Low)
W1
+ -
TB18
Analog In 8
Analog Ground
V
source
8
V
source
1
STA-300
Panel
Signal Source
+ -
TB1
TB3
TB17
Analog In 0
Analog In 1
V
CM
Remove Jumper W1 to use Amp
Low as a remote ground sense.
TB18
Analog Ground
*
Analog In 8
TB2
V
source
0
V
source
8
V
source
1
+
+
-
-
*Make this connection as close to V
IN
sources as
possible to reduce ground loop errors. V
cm
is
the common mode voltage for all 16 analog inputs.