Measurement-computing USB-2416-4AO Uživatelský manuál stáhnout pdf (Strana 10)

USB-2416-4AO User's Guide Installing the USB-2416-4AO

Screw terminal pin out – differential

Figure 4. 16-channel differential mode pin out

Differential connection guidelines

 When connecting differential voltage inputs to a "floating" voltage source, make sure there is a DC return

path from each voltage input to ground. You make this path by connecting a resistor from each input to a

GND pin (pins 18, 36, 39, 42, 44, 46, 66, 81, 84). A value of approximately 100 kΩ can be used for most

applications.

Leave unused input channels either floating or tied to GND (pins 18, 36, 39, 42, 44, 46, 66, 81, 84).

Source impedances should be kept as small as possible to avoid settling time and accuracy errors.

 When configuring thermocouple sensors, keep any stray capacitance as small as possible relative to GND

(pins 18, 36, 39, 42, 44, 46, 66, 81, 84) to avoid settling time and accuracy errors. For thermocouple

channels, do not provide a return path to ground. This is done internally.

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Measurement-computing USB-2416-4AO Uživatelský manuál Strana 10