Chapter3 HardwareOverview
©NationalInstruments Corporation 3-3 6023E/6024E/6025EUser Manual
Fordiagrams showing the signal paths of the three configurations,refer to
the Analog Input Signal Overview section in Chapter 4, Signal
Connections.
Input Range
Thedevices have a bipolar input range that changes with the programmed
gain.You can program each channel with a unique gain of 0.5, 1.0, 10, or
100 to maximize the 12-bit analog-to-digital converter (ADC) resolution.
Withthe proper gain setting, you can use the full resolutio no fthe ADC to
measure the input signal. Table 3-2 shows thein put range andprecision
according to the gain used.
Table3-1. Available Input Configurations
Configuration Description
DIFF Achannel configured in DIFF mode uses two analog
inputlines. One line connects to the po sitiveinput of
the programmable gain instrumentation amplifier
(PGIA)of t he device,and the other connects to the
negativeinput of the PGIA.
RSE Achannel configured in RSE mode uses one analog
inputline, which connects to the positive input of the
PGIA. The negativeinput of the PGIA is internally
tied to analog input ground (AIGND).
NRSE A channel configuredin N RSE mode uses one
analog input line, which connects to the positive
input of the PGIA. The negativeinput of the PGIA
connects to analog input sense (AISENSE).
Table3-2. Measurement Precision
Gain Input Range Precision1
0.5 –10 to +10 V 4.88 mV
1.0 –5to+5V 2.44mV
10.0 –500 to +500 mV 244.14 µV
100.0 –50 to +50 mV 24.41µV
1Thevalue of 1 LSB of the 12-bit ADC; that is, the voltage increment corresponding to a
changeof one count in the ADC 12-bit count.
Note:See Appendix A, Specifications, for absolute maximum ratings.