NI PXIe-4082

The NI PXIe-4082 (NI 4082) is a 6½ digit DMM for the PXI bus. The NI 4082 can take capacitance and inductance measurements and can acquire waveforms at 1.8 MS/s. For more information about the NI 4082 specifications, refer to the NI PXIe-4082 Specifications document.

Impedance

The NI 4082 uses a 2-wire, AC-current technique to measure capacitance and inductance. A current source (Isrc) is supplied to the device under test (DUT), and the NI 4082 determines the measured voltage (Vm), as shown in the following figure.

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With a known current and voltage, the NI 4082 determines the capacitance or inductance of the DUT if the residual serial impedance (Zs) and the stray parallel impedance (Yp) are small or negligible compared to the DUT. If (Zs) and (Yp) introduce a significant error into the measurement, the NI 4082 can measure the error and reduce it using compensation techniques. For more information, refer to the OPEN/SHORT Compensation section.

For the measurement ranges for the capacitance and inductance modes on the NI 4082, refer to Related Documentation for the NI 4082 specifications document.

Interconnects and Cables

The front of the NI 4082 module has four high-voltage, safety-agency approved banana plug connectors. For an illustration of the front panel connectors and wiring instructions, refer to Front Panel Connections topic for the NI 4082.

For use with the NI 4082, NI recommends selecting a cable with characteristics similar to the Belden 83317E, which is available at www.belden.com. 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.

Table 4. Belden #83317E Teflon Insulated Cable
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 4082 can operate as a DMM and can acquire waveforms up to 1.8 MS/s. Refer to the NI PXIe-4082 Specifications document for a full list of functions and ranges supported by the NI 4082.

The following table lists the functions and ranges supported by the NI 4082 while in DMM mode.

DMM Function Ranges
DC Voltage 100 mV, 1 V, 10 V, 100 V, 300 V
AC Voltage 50 mV, 500 mV, 5 V, 50 V, 300 V
DC Current1 20 mA, 200 mA, 1 A
AC Current1 10 mA, 100 mA, 1 A
2-Wire Resistance 100 Ω, 1 kΩ, 10 kΩ, 100 kΩ, 1 MΩ, 10 MΩ, 100 MΩ
4-Wire Resistance 100 Ω, 1 kΩ, 10 kΩ, 100 kΩ, 1 MΩ, 10 MΩ
Diode 10 V at 1 µA / 10µA / 100µA; 4.5 V at 1 mA
Frequency/Period2 15 Hz - 500 kHz / 2 µs - 67 ms
Capacitance 300 pF, 1 nF, 10 nF, 100 nF, 1 µF, 10 µF, 100 µF, 1,000 µF, 10,000 µF
Inductance 10 µH, 100 µH, 1 mH, 10 mH, 100 mH, 1 H, 5 H

1To measure current outside of the normal range on the NI 4082, you must use a current shunt module (CSM). Refer to Measuring Current for more information.

2Frequency/Period voltage ranges are the same as AC voltage ranges.

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, 300 V AC or DC
Current Waveform1 20 mA, 200 mA, 1 A DC
1To measure current outside of the normal range on the NI 4082, you must use a current shunt module (CSM). Refer to the Measuring Current section for more information.

The following table lists the available NI 4082 input resistance selections. NI calibrates the NI 4082 for full accuracy with all input resistances shown.

DCV ACV Voltage Waveform
Range Input Resistance Range Input Resistance Range Input Resistance
100 mV 10 MΩ (default) or 10 GΩ 50 mV 1 MΩ 100 mV 10 GΩ or 1 MΩ (default)
1 V 10 MΩ (default) or 10 GΩ 500 mV 1 MΩ 1 V 10 GΩ or 1 MΩ (default)
10 V 10 MΩ (default) or 10 GΩ 5 V 1 MΩ 10 V 10 GΩ or 1 MΩ (default)
100 V 10 MΩ (default) 50 V 1 MΩ 100 V 1 MΩ (default)
300 V 10 MΩ (default) 300 V 1 MΩ 300 V 1 MΩ (default)

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 4082 is equipped with a 1 A 400 V time-lag fuse designed to help protect the DMM and your test system. For instructions on replacing the fuse, refer to the Fuse Replacement topic for the NI 4082.

Calibrating the NI 4082

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 NI 4082 6½-Digit DMM Calibration Procedure at the NI Calibration Solutions Web site for information on externally calibrating the NI PXIe-4082. For information on calibrating the NI 4082 using Calibration Executive, refer to the NI Calibration Solutions Web site. All NI measurement devices receive NIST-traceable calibration before shipping.