NI 4071
The NI 4071 DMM for the PXI bus has a 7½ digit capability for the resistance and DCV modes and a 6½ digit capability for all other modes. The NI 4071 has a 1000 V capability and can acquire waveforms at 1.8 MS/s. For more information about the NI 4071 specifications, refer to Related Documentation for the NI 4071 specifications document.
This topic contains the following subsections:
Interconnects and Cables
The front of the NI 4071 module has five connectors—four banana jacks and one 9-pin mini–circular DIN connector. The four banana jack connectors are high-voltage, safety-agency approved signal connectors. The 9-pin DIN connector labeled AUX I/O is a digital signal connector, which carries triggers and SCXI communication signals. For an illustration of the front panel connectors and wiring instructions, refer to Front Panel Connections topic for the NI 4071.
The input connectors on the NI 4071 are gold-plated, low-thermal copper for best low-voltage performance. The insulator material is a Lexan compound, optimized for low leakage over the full environmental operating range.
For use with the NI 4071, NI recommends selecting a cable with characteristics similar to the Belden 83317E; refer to the Belden CDT Incorporated Web site at www.belden.com for information about this cable.
Tape-wrapped polytetrafluoroethylene (PTFE) insulation guarantees low leakage. Copper conductors with silver plating perform very well for low-voltage measurements because of their low thermal characteristics. Use a cable with at least 90% shielding effectiveness.
| Type of Insulator | AWG | Conductor Material | Resistance per Foot | Capacitance per Foot |
|---|---|---|---|---|
| TFE | 26 | Silver-plated copper, stranded | 39 mΩ | 35.5 pF |
Operation
The NI 4071 can operate as a DMM and can acquire waveforms up to 1.8 MS/s. The following table lists the functions and ranges supported by the NI 4071 while in DMM mode:
| DMM Function | Ranges |
|---|---|
| DC Voltage | 100 mV, 1 V, 10 V, 100 V, 1000 V |
| AC Voltage | 50 mV, 500 mV, 5 V, 50 V, 700 V |
| DC Current* | 1 µA, 10 µA, 100 µA, 1 mA, 10 mA, 100 mA, 1 A, 3 A |
| AC Current* | 100 µA, 1 mA, 10 mA, 100 mA, 1 A, 3 A |
| 2-Wire Resistance | 100 Ω, 1 kΩ, 10 kΩ, 100 kΩ, 1 MΩ, 10 MΩ, 100 MΩ, 5 GΩ |
| 4-Wire Resistance | 100 Ω, 1 kΩ, 10 kΩ, 100 kΩ, 1 MΩ, 10 MΩ |
| Diode | 10 V at 1 µA / 10µA / 100µA; 4.0 V at 1 mA |
| Frequency/Period | 50 mV, 500 mV, 5 V, 50 V, 700 V |
| * To measure current outside of the normal range on the NI 4071, you must use a current shunt module (CSM). Refer to the Measuring Current section for more information. | |
The following table lists the functions and ranges supported for waveform acquisitions:
| Waveform Function | Ranges | Coupling |
|---|---|---|
| Voltage Waveform | 100 mV, 1 V, 10 V, 100 V, 1000 V | AC or DC |
| Current Waveform* | 100 µA, 1 mA, 10 mA, 100 mA, 1 A, 3 A | DC |
| * To measure current outside of the normal range on the NI 4071, you must use a current shunt module (CSM). Refer to the Measuring Current section for more information. | ||
Additional Features
- Self-Calibration
- Auto Zero
- Configuring Auto Range
- Offset Compensated Ohms
- ADC Calibration
- Input Resistance
- Configuring Measurement Timing
- Aperture Time
- DC Noise Rejection
- Waveform Acquisitions
- Single Point Acquisitions
- Generating Measurement Complete
- Scanning Switch Modules
Replacing the Fuse
The NI 4071 is equipped with a F 3.15 A 250 V Fast–Acting fuse designed to help protect the DMM and your test system. For instructions on replacing the fuse, refer to Related Documentation for the NI Digital Multimeters Getting Started Guide.
Calibrating the NI 4071
Calibration maximizes the accuracy of a DMM. To ensure accuracy, you must perform calibration. NI recommends that you externally calibrate every two years. Refer to the self-calibration or ADC calibration sections to internally calibrate the NI 4071. Refer to the NI 4071 7½–Digit FlexDMM Calibration Procedure at the NI Calibration Solutions Web site for information on externally calibrating the NI PXI-4071. For information on calibrating the NI 4071 using National Instruments Calibration Executive, refer to the NI Calibration Solutions Web site. All NI measurement devices receive NIST-traceable calibration before shipping.