National Instruments AT-MIO-16 User Manual

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National Instruments AT-MIO-16 User Manual Manual pdf 25 page image

Configuration and Installation Chapter 2AT-MIO-16 User Manual 2-10 © National Instruments CorporationTable 2-7. RSE Input ConfigurationJumperSettingsDescriptionW6HFDBGECAAISENSE is tied to the instrumentation amplifier signal ground.The instrumentation amplifier negative input is tied to the instrumentationamplifier signal ground.The multiplexer outputs are tied together into the positive input of theinstrumentation amplifier.W9DIFFSEThe multiplexer is configured to control 16 input channels.NRSE Input (16 Channels).NRSE input means that all input signals are referenced to the same common mode voltage, butthat this common mode voltage is allowed to float with respect to the analog ground of theAT-MIO-16 board. This common mode voltage is subsequently subtracted out by the inputinstrumentation amplifier. This configuration is useful when measuring ground-referencedsignal sources. See the Types of Signal Sources section in Chapter 3, Signal Connections, formore information. With this input configuration, the AT-MIO-16 can measure 16 differentanalog input signals. You select the NRSE input configuration by setting jumpers W6 and W9 asshown in Table 2-8.Table 2-8. NRSE Input ConfigurationJumperSettingsDescriptionW6HFDBGECAAISENSE is tied to the negative input of the instrumentation amplifier.The jumper is placed in standby position or can be discarded.The multiplexer outputs are tied together into the positive input of theinstrumentation amplifier.W9DIFFSEThe multiplexer control is configured to control 16 input channels.Analog Input Polarity and RangeThe AT-MIO-16 has two input polarities—unipolar and bipolar. Unipolar input means that theinput voltage range is between 0 and V ref where Vref is some positive reference voltage. Bipolarinput means that the input voltage range is between -Vref and +Vref . The AT-MIO-16 also hastwo input ranges—a 10 V input range and a 20 V input range. You can select one of threepossible input polarity and range configurations as shown in Table 2-9.