Measurement System Types and Signal Sources
The type of input signal source (grounded or floating) and the configuration of the measurement system (differential, single-ended, pseudodifferential) determine how you connect signals to measurement devices.
The following table provides an application-independent summary of analog input connections.
| Input | Signal Source Type | |
|---|---|---|
| Floating Signal Source (Not Connected to Building Ground) | Grounded Signal Source | |
| Examples: Ungrounded thermocouples, signal conditioning with isolated outputs, battery devices | Example: Instruments with nonisolated outputs | |
| Differential (DIFF) |  |
 |
| Ground Referenced Single-Ended (RSE) Note: AI GND is shared as a reference for all RSE channels |  |
 |
| Nonreferenced Single-Ended (NRSE)Note: AI SENSE is shared as a reference for all NRSE channels |  |
 |
| Pseudodifferential |  |
 |
| Rext is the external bias resistor that you add. | ||