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National Instruments NI 9219 Figure 3. Connecting a Grounded Signal Source to the NI 9219, Figure 4. Connecting a Floating Signal Source to the NI 9219

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© National Instruments Corp. 11 NI 9219 Operating Instructions

Figure 3. Connecting a Grounded Signal Source to the NI 9219Figure 4. Connecting a Floating Signal Source to the NI 9219

+

–

Twisted-Pair

Wiring

VSIG

VSIG Ground

Reference

Signal Source Shielding

HI

LO

NI 9219

+

–

Twisted-Pair

Wiring

VSIG

Signal Source Shielding

HI

LO NI 9219

Contents

Main Safety Guidelines Safety Guidelines for Hazardous Voltages Safety Guidelines for Hazardous Locations Special Conditions for Marine Applications Wiring the NI 9219 Page Page Connecting Wires to the NI 9219 Connectors Wiring TEDS Channels Grounding and Shielding Considerations Figure 3. Connecting a Grounded Signal Source to the NI 9219 Figure 4. Connecting a Floating Signal Source to the NI 9219 NI 9219 Timing Options NI 9219 Circuitry Figure 5. Input Circuitry for One Channel Voltage and Current Modes Figure 6. Connections in Voltage, Current, and Digital In Modes + 4-Wire Resistance and 4-Wire RTD Modes 3-Wire RTD Mode 2-Wire Resistance and Quarter-Bridge Modes Half-Bridge and Full-Bridge Modes Thermocouple Mode Digital In Mode Open Contact Mode Sleep Mode Binary Data Excitation Protection Specifications Input Characteristics Page Page Page Page Input noise in ppm of Range Page Page Power Requirements Physical Characteristics Safety Safety Voltages Safety Standards Hazardous Locations Environmental Shock and Vibration Electromagnetic Compatibility CE Compliance Waste Electrical and Electronic Equipment (WEEE) Calibration Where to Go for Support