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random scanning

scanning the channels in a mux in any order

relay

a switch that connects or disconnects the signal to a common through the 
physical movement of a metal arm

RMA

Return Material Authorization

rms

root mean square—the square root of the average value of the square of the 
instantaneous signal amplitude; a measure of signal amplitude

RTD

resistance temperature detector—a metallic probe that measures 
temperature based upon its coefficient of resistivity

s

seconds

scan

the data acquisition of signals connected to multiple channels of a 
multiplexer. Typically, the measurement device uses a trigger to 
advance the multiplexer to the next channel in the scan.

SCANADVD

scanner advance signal—in handshake scanning this signal is generated by 
the switching module to let the instrument or DMM know that the 
switching module has finished settling at the current channel

scan list

a list of channels supplied to NI-SWITCH that indicates the order in which 
channels will be scanned

scanner advanced 
trigger

the trigger generated by the switch card when scanning. The trigger occurs 
after the switch card has closed a switch and the switch has settled.

SCXI

Signal Conditioning eXtensions for Instrumentation—the National 
Instruments product line for conditioning low-level signals within an 
external chassis near sensors so only high-level signals are sent to DAQ 
boards in the noisy PC environment

sensor

a device that responds to a physical stimulus (heat, light, sound, 
pressure, motion, flow, and so on), and produces a corresponding 
electrical signal

settling time

the amount of time required for a voltage to reach its final value within 
specified limits