Chapter 4
Connecting the Signals
4-6
ni.com
Each analog input for the DAQPad-6052E with BNCs has a switch that you
set based on whether the BNC is connected to a floating source (FS) or a
grounded source (GS). Figure 4-3 shows how setting the switch to FS
connects the negative terminal of the differential input to ground through a
5 k
Ω
resistor in parallel with 0.1
µ
F resistor. If you are using a differential
channel connected to a floating source, set the switch to FS. Set the switch
to GS to allow both positive and negative terminals to float. If you are using
a single-ended channel or using a differential channel connected to a
grounded source, set the switch to GS. Refer to the
section for more information on single-ended channels, differential
channels, floating sources, and grounded sources.
Figure 4-3.
Floating Source and Grounded Source Connections
External Expansion Connector
The external expansion connector, which connects to SCXI in serial mode,
is located on the back panel of the DAQPad-6052E. Using the external
expansion connector does not use any AI channels, but does use DIO0,
DIO1, DIO2, DIO4, and PF17/STARTSCAN.
Caution
Connections that exceed any of the maximum ratings of input or output signals
on the NI 6052E can damage the device and the computer. Maximum input ratings for each
signal are given in the
Protection
column of Table 4-3. NI is
not
liable for any damage
resulting from such signal connections.
+
–
+
FS
–
+
–
+
GS
5 k
–
Switch Is Set To
Switch Is Set To
0.1
µ
F
