18 |
3. Analog Input (AI)
This chapter describes measuring the relevant content of analog input signals on USB-3200
series data acquisition
devices
. AI here is short for Analog Input.
3.1.
Circuit diagram
Figure 3.1 analog input circuit
3.2.
Signal connection methods
USB-3200 series data acquisition
devices
support analog input acquisition connection methods
of non-grounding reference single-ended input (NRSE) and differential input (DIFF).
Table 3.1 lists the recommended connection methods for floating-ground signal sources and
grounding signal sources
Analog input
mode
Floating ground signal source (not
connected to GND of the building)
Grounded signal source
Example
Ungrounded thermocouples
Signals that are isolated
Battery-powered devices
Signals that are not isolated
Differential
input
（
DIFF
）