Chapter 6 Connecting AI Signals on the USB-6215/6218 Devices

Non-Referenced Single-Ended (NRSE) Measurements

To reach a compromise between RSE and differential measurements, you can use an NRSE measurement configuration. This configuration allows for a remote sense for the negative (–) input of the programmable gain instrumentation amplifier (PGIA) that is shared among all channels configured for NRSE mode. The behavior of this configuration is similar to the behavior of RSE connections but it provides improved noise rejection. Refer to Figure 6-3for an illustration of an NRSE connection configuration.

AI1

MUX

PGIA

ADC

AI0

AISENSE

AI GND

USB-6215/6218

Figure 6-3.Connecting a Device to a USB-6215/6218 Using NRSE Connections

In the NRSE connection configuration, each input channel is measured with respect to AI SENSE.